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http.c

/*
 * Copyright (c) 2002-2006 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_IOCCOM_H
#include <sys/ioccom.h>
#endif

#ifndef WIN32
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/wait.h>
#endif

#include <sys/queue.h>

#ifndef WIN32
#include <netinet/in.h>
#include <netdb.h>
#endif

#ifdef WIN32
#include <winsock2.h>
#endif

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef WIN32
#include <syslog.h>
#endif
#include <signal.h>
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#undef timeout_pending
#undef timeout_initialized

#include "strlcpy-internal.h"
#include "event.h"
#include "evhttp.h"
#include "evutil.h"
#include "log.h"
#include "http-internal.h"

#ifdef WIN32
#define strcasecmp _stricmp
#define strncasecmp _strnicmp
#define strdup _strdup
#endif

#ifndef HAVE_GETNAMEINFO
#define NI_MAXSERV 32
#define NI_MAXHOST 1025

#define NI_NUMERICHOST 1
#define NI_NUMERICSERV 2

static int
fake_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, 
      size_t hostlen, char *serv, size_t servlen, int flags)
{
        struct sockaddr_in *sin = (struct sockaddr_in *)sa;
        
        if (serv != NULL) {
                        char tmpserv[16];
                        evutil_snprintf(tmpserv, sizeof(tmpserv),
                              "%d", ntohs(sin->sin_port));
                if (strlcpy(serv, tmpserv, servlen) >= servlen)
                        return (-1);
        }

        if (host != NULL) {
                if (flags & NI_NUMERICHOST) {
                        if (strlcpy(host, inet_ntoa(sin->sin_addr),
                            hostlen) >= hostlen)
                                return (-1);
                        else
                                return (0);
                } else {
                                    struct hostent *hp;
                        hp = gethostbyaddr((char *)&sin->sin_addr, 
                            sizeof(struct in_addr), AF_INET);
                        if (hp == NULL)
                                return (-2);
                        
                        if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
                                return (-1);
                        else
                                return (0);
                }
        }
        return (0);
}

#endif

#ifndef HAVE_GETADDRINFO
struct addrinfo {
      int ai_family;
      int ai_socktype;
      int ai_protocol;
      size_t ai_addrlen;
      struct sockaddr *ai_addr;
      struct addrinfo *ai_next;
};
static int
fake_getaddrinfo(const char *hostname, struct addrinfo *ai)
{
      struct hostent *he = NULL;
      struct sockaddr_in *sa;
      if (hostname) {
            he = gethostbyname(hostname);
            if (!he)
                  return (-1);
      }
      ai->ai_family = he ? he->h_addrtype : AF_INET;
      ai->ai_socktype = SOCK_STREAM;
      ai->ai_protocol = 0;
      ai->ai_addrlen = sizeof(struct sockaddr_in);
      if (NULL == (ai->ai_addr = malloc(ai->ai_addrlen)))
            return (-1);
      sa = (struct sockaddr_in*)ai->ai_addr;
      memset(sa, 0, ai->ai_addrlen);
      if (he) {
            sa->sin_family = he->h_addrtype;
            memcpy(&sa->sin_addr, he->h_addr_list[0], he->h_length);
      } else {
            sa->sin_family = AF_INET;
            sa->sin_addr.s_addr = INADDR_ANY;
      }
      ai->ai_next = NULL;
      return (0);
}
static void
fake_freeaddrinfo(struct addrinfo *ai)
{
      free(ai->ai_addr);
}
#endif

#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif

/* wrapper for setting the base from the http server */
#define EVHTTP_BASE_SET(x, y) do { \
      if ((x)->base != NULL) event_base_set((x)->base, y);  \
} while (0) 

extern int debug;

static int socket_connect(int fd, const char *address, unsigned short port);
static int bind_socket_ai(struct addrinfo *, int reuse);
static int bind_socket(const char *, u_short, int reuse);
static void name_from_addr(struct sockaddr *, socklen_t, char **, char **);
static int evhttp_associate_new_request_with_connection(
      struct evhttp_connection *evcon);
static void evhttp_connection_start_detectclose(
      struct evhttp_connection *evcon);
static void evhttp_connection_stop_detectclose(
      struct evhttp_connection *evcon);
static void evhttp_request_dispatch(struct evhttp_connection* evcon);
static void evhttp_read_firstline(struct evhttp_connection *evcon,
                          struct evhttp_request *req);
static void evhttp_read_header(struct evhttp_connection *evcon,
    struct evhttp_request *req);
static int evhttp_add_header_internal(struct evkeyvalq *headers,
    const char *key, const char *value);
static int evhttp_decode_uri_internal(const char *uri, size_t length,
    char *ret, int always_decode_plus);

void evhttp_read(int, short, void *);
void evhttp_write(int, short, void *);

#ifndef HAVE_STRSEP
/* strsep replacement for platforms that lack it.  Only works if
 * del is one character long. */
static char *
strsep(char **s, const char *del)
{
      char *d, *tok;
      assert(strlen(del) == 1);
      if (!s || !*s)
            return NULL;
      tok = *s;
      d = strstr(tok, del);
      if (d) {
            *d = '\0';
            *s = d + 1;
      } else
            *s = NULL;
      return tok;
}
#endif

static const char *
html_replace(char ch, char *buf)
{
      switch (ch) {
      case '<':
            return "&lt;";
      case '>':
            return "&gt;";
      case '"':
            return "&quot;";
      case '\'':
            return "&#039;";
      case '&':
            return "&amp;";
      default:
            break;
      }

      /* Echo the character back */
      buf[0] = ch;
      buf[1] = '\0';
      
      return buf;
}

/*
 * Replaces <, >, ", ' and & with &lt;, &gt;, &quot;,
 * &#039; and &amp; correspondingly.
 *
 * The returned string needs to be freed by the caller.
 */

char *
00276 evhttp_htmlescape(const char *html)
{
      int i, new_size = 0, old_size = strlen(html);
      char *escaped_html, *p;
      char scratch_space[2];
      
      for (i = 0; i < old_size; ++i)
          new_size += strlen(html_replace(html[i], scratch_space));

      p = escaped_html = malloc(new_size + 1);
      if (escaped_html == NULL)
            event_err(1, "%s: malloc(%d)", __func__, new_size + 1);
      for (i = 0; i < old_size; ++i) {
            const char *replaced = html_replace(html[i], scratch_space);
            /* this is length checked */
            strcpy(p, replaced);
            p += strlen(replaced);
      }

      *p = '\0';

      return (escaped_html);
}

static const char *
evhttp_method(enum evhttp_cmd_type type)
{
      const char *method;

      switch (type) {
      case EVHTTP_REQ_GET:
            method = "GET";
            break;
      case EVHTTP_REQ_POST:
            method = "POST";
            break;
      case EVHTTP_REQ_HEAD:
            method = "HEAD";
            break;
      default:
            method = NULL;
            break;
      }

      return (method);
}

static void
evhttp_add_event(struct event *ev, int timeout, int default_timeout)
{
      if (timeout != 0) {
            struct timeval tv;
            
            evutil_timerclear(&tv);
            tv.tv_sec = timeout != -1 ? timeout : default_timeout;
            event_add(ev, &tv);
      } else {
            event_add(ev, NULL);
      }
}

void
evhttp_write_buffer(struct evhttp_connection *evcon,
    void (*cb)(struct evhttp_connection *, void *), void *arg)
{
      event_debug(("%s: preparing to write buffer\n", __func__));

      /* Set call back */
      evcon->cb = cb;
      evcon->cb_arg = arg;

      /* check if the event is already pending */
      if (event_pending(&evcon->ev, EV_WRITE|EV_TIMEOUT, NULL))
            event_del(&evcon->ev);

      event_set(&evcon->ev, evcon->fd, EV_WRITE, evhttp_write, evcon);
      EVHTTP_BASE_SET(evcon, &evcon->ev);
      evhttp_add_event(&evcon->ev, evcon->timeout, HTTP_WRITE_TIMEOUT);
}

static int
evhttp_connected(struct evhttp_connection *evcon)
{
      switch (evcon->state) {
      case EVCON_DISCONNECTED:
      case EVCON_CONNECTING:
            return (0);
      case EVCON_IDLE:
      case EVCON_READING_FIRSTLINE:
      case EVCON_READING_HEADERS:
      case EVCON_READING_BODY:
      case EVCON_READING_TRAILER:
      case EVCON_WRITING:
      default:
            return (1);
      }
}

/*
 * Create the headers needed for an HTTP request
 */
static void
evhttp_make_header_request(struct evhttp_connection *evcon,
    struct evhttp_request *req)
{
      const char *method;
      
      evhttp_remove_header(req->output_headers, "Proxy-Connection");

      /* Generate request line */
      method = evhttp_method(req->type);
      evbuffer_add_printf(evcon->output_buffer, "%s %s HTTP/%d.%d\r\n",
          method, req->uri, req->major, req->minor);

      /* Add the content length on a post request if missing */
      if (req->type == EVHTTP_REQ_POST &&
          evhttp_find_header(req->output_headers, "Content-Length") == NULL){
            char size[12];
            evutil_snprintf(size, sizeof(size), "%ld",
                (long)EVBUFFER_LENGTH(req->output_buffer));
            evhttp_add_header(req->output_headers, "Content-Length", size);
      }
}

static int
evhttp_is_connection_close(int flags, struct evkeyvalq* headers)
{
      if (flags & EVHTTP_PROXY_REQUEST) {
            /* proxy connection */
            const char *connection = evhttp_find_header(headers, "Proxy-Connection");
            return (connection == NULL || strcasecmp(connection, "keep-alive") != 0);
      } else {
            const char *connection = evhttp_find_header(headers, "Connection");
            return (connection != NULL && strcasecmp(connection, "close") == 0);
      }
}

static int
evhttp_is_connection_keepalive(struct evkeyvalq* headers)
{
      const char *connection = evhttp_find_header(headers, "Connection");
      return (connection != NULL 
          && strncasecmp(connection, "keep-alive", 10) == 0);
}

static void
evhttp_maybe_add_date_header(struct evkeyvalq *headers)
{
      if (evhttp_find_header(headers, "Date") == NULL) {
            char date[50];
#ifndef WIN32
            struct tm cur;
#endif
            struct tm *cur_p;
            time_t t = time(NULL);
#ifdef WIN32
            cur_p = gmtime(&t);
#else
            gmtime_r(&t, &cur);
            cur_p = &cur;
#endif
            if (strftime(date, sizeof(date),
                  "%a, %d %b %Y %H:%M:%S GMT", cur_p) != 0) {
                  evhttp_add_header(headers, "Date", date);
            }
      }
}

static void
evhttp_maybe_add_content_length_header(struct evkeyvalq *headers,
    long content_length)
{
      if (evhttp_find_header(headers, "Transfer-Encoding") == NULL &&
          evhttp_find_header(headers,     "Content-Length") == NULL) {
            char len[12];
            evutil_snprintf(len, sizeof(len), "%ld", content_length);
            evhttp_add_header(headers, "Content-Length", len);
      }
}

/*
 * Create the headers needed for an HTTP reply
 */

static void
evhttp_make_header_response(struct evhttp_connection *evcon,
    struct evhttp_request *req)
{
      int is_keepalive = evhttp_is_connection_keepalive(req->input_headers);
      evbuffer_add_printf(evcon->output_buffer, "HTTP/%d.%d %d %s\r\n",
          req->major, req->minor, req->response_code,
          req->response_code_line);

      if (req->major == 1) {
            if (req->minor == 1)
                  evhttp_maybe_add_date_header(req->output_headers);

            /*
             * if the protocol is 1.0; and the connection was keep-alive
             * we need to add a keep-alive header, too.
             */
            if (req->minor == 0 && is_keepalive)
                  evhttp_add_header(req->output_headers,
                      "Connection", "keep-alive");

            if (req->minor == 1 || is_keepalive) {
                  /* 
                   * we need to add the content length if the
                   * user did not give it, this is required for
                   * persistent connections to work.
                   */
                  evhttp_maybe_add_content_length_header(
                        req->output_headers,
                        (long)EVBUFFER_LENGTH(req->output_buffer));
            }
      }

      /* Potentially add headers for unidentified content. */
      if (EVBUFFER_LENGTH(req->output_buffer)) {
            if (evhttp_find_header(req->output_headers,
                  "Content-Type") == NULL) {
                  evhttp_add_header(req->output_headers,
                      "Content-Type", "text/html; charset=ISO-8859-1");
            }
      }

      /* if the request asked for a close, we send a close, too */
      if (evhttp_is_connection_close(req->flags, req->input_headers)) {
            evhttp_remove_header(req->output_headers, "Connection");
            if (!(req->flags & EVHTTP_PROXY_REQUEST))
                evhttp_add_header(req->output_headers, "Connection", "close");
            evhttp_remove_header(req->output_headers, "Proxy-Connection");
      }
}

void
evhttp_make_header(struct evhttp_connection *evcon, struct evhttp_request *req)
{
      struct evkeyval *header;

      /*
       * Depending if this is a HTTP request or response, we might need to
       * add some new headers or remove existing headers.
       */
      if (req->kind == EVHTTP_REQUEST) {
            evhttp_make_header_request(evcon, req);
      } else {
            evhttp_make_header_response(evcon, req);
      }

      TAILQ_FOREACH(header, req->output_headers, next) {
            evbuffer_add_printf(evcon->output_buffer, "%s: %s\r\n",
                header->key, header->value);
      }
      evbuffer_add(evcon->output_buffer, "\r\n", 2);

      if (EVBUFFER_LENGTH(req->output_buffer) > 0) {
            /*
             * For a request, we add the POST data, for a reply, this
             * is the regular data.
             */
            evbuffer_add_buffer(evcon->output_buffer, req->output_buffer);
      }
}

/* Separated host, port and file from URI */

int
evhttp_hostportfile(char *url, char **phost, u_short *pport, char **pfile)
{
      /* XXX not threadsafe. */
      static char host[1024];
      static char file[1024];
      char *p;
      const char *p2;
      int len;
      u_short port;

      len = strlen(HTTP_PREFIX);
      if (strncasecmp(url, HTTP_PREFIX, len))
            return (-1);

      url += len;

      /* We might overrun */
      if (strlcpy(host, url, sizeof (host)) >= sizeof(host))
            return (-1);

      p = strchr(host, '/');
      if (p != NULL) {
            *p = '\0';
            p2 = p + 1;
      } else
            p2 = NULL;

      if (pfile != NULL) {
            /* Generate request file */
            if (p2 == NULL)
                  p2 = "";
            evutil_snprintf(file, sizeof(file), "/%s", p2);
      }

      p = strchr(host, ':');
      if (p != NULL) {
            *p = '\0';
            port = atoi(p + 1);

            if (port == 0)
                  return (-1);
      } else
            port = HTTP_DEFAULTPORT;

      if (phost != NULL)
            *phost = host;
      if (pport != NULL)
            *pport = port;
      if (pfile != NULL)
            *pfile = file;

      return (0);
}

static int
evhttp_connection_incoming_fail(struct evhttp_request *req,
    enum evhttp_connection_error error)
{
      switch (error) {
      case EVCON_HTTP_TIMEOUT:
      case EVCON_HTTP_EOF:
            /* 
             * these are cases in which we probably should just
             * close the connection and not send a reply.  this
             * case may happen when a browser keeps a persistent
             * connection open and we timeout on the read.
             */
            return (-1);
      case EVCON_HTTP_INVALID_HEADER:
      default:    /* xxx: probably should just error on default */
            /* the callback looks at the uri to determine errors */
            if (req->uri) {
                  free(req->uri);
                  req->uri = NULL;
            }

            /* 
             * the callback needs to send a reply, once the reply has
             * been send, the connection should get freed.
             */
            (*req->cb)(req, req->cb_arg);
      }
      
      return (0);
}

void
evhttp_connection_fail(struct evhttp_connection *evcon,
    enum evhttp_connection_error error)
{
      struct evhttp_request* req = TAILQ_FIRST(&evcon->requests);
      void (*cb)(struct evhttp_request *, void *);
      void *cb_arg;
      assert(req != NULL);
      
      if (evcon->flags & EVHTTP_CON_INCOMING) {
            /* 
             * for incoming requests, there are two different
             * failure cases.  it's either a network level error
             * or an http layer error. for problems on the network
             * layer like timeouts we just drop the connections.
             * For HTTP problems, we might have to send back a
             * reply before the connection can be freed.
             */
            if (evhttp_connection_incoming_fail(req, error) == -1)
                  evhttp_connection_free(evcon);
            return;
      }

      /* save the callback for later; the cb might free our object */
      cb = req->cb;
      cb_arg = req->cb_arg;

      TAILQ_REMOVE(&evcon->requests, req, next);
      evhttp_request_free(req);

      /* xxx: maybe we should fail all requests??? */

      /* reset the connection */
      evhttp_connection_reset(evcon);
      
      /* We are trying the next request that was queued on us */
      if (TAILQ_FIRST(&evcon->requests) != NULL)
            evhttp_connection_connect(evcon);

      /* inform the user */
      if (cb != NULL)
            (*cb)(NULL, cb_arg);
}

void
evhttp_write(int fd, short what, void *arg)
{
      struct evhttp_connection *evcon = arg;
      int n;

      if (what == EV_TIMEOUT) {
            evhttp_connection_fail(evcon, EVCON_HTTP_TIMEOUT);
            return;
      }

      n = evbuffer_write(evcon->output_buffer, fd);
      if (n == -1) {
            event_debug(("%s: evbuffer_write", __func__));
            evhttp_connection_fail(evcon, EVCON_HTTP_EOF);
            return;
      }

      if (n == 0) {
            event_debug(("%s: write nothing", __func__));
            evhttp_connection_fail(evcon, EVCON_HTTP_EOF);
            return;
      }

      if (EVBUFFER_LENGTH(evcon->output_buffer) != 0) {
            evhttp_add_event(&evcon->ev, 
                evcon->timeout, HTTP_WRITE_TIMEOUT);
            return;
      }

      /* Activate our call back */
      if (evcon->cb != NULL)
            (*evcon->cb)(evcon, evcon->cb_arg);
}

/**
 * Advance the connection state.
 * - If this is an outgoing connection, we've just processed the response;
 *   idle or close the connection.
 * - If this is an incoming connection, we've just processed the request;
 *   respond.
 */
static void
evhttp_connection_done(struct evhttp_connection *evcon)
{
      struct evhttp_request *req = TAILQ_FIRST(&evcon->requests);
      int con_outgoing = evcon->flags & EVHTTP_CON_OUTGOING;

      if (con_outgoing) {
            /* idle or close the connection */
              int need_close;
            TAILQ_REMOVE(&evcon->requests, req, next);
            req->evcon = NULL;

            evcon->state = EVCON_IDLE;

            need_close = 
                evhttp_is_connection_close(req->flags, req->input_headers)||
                evhttp_is_connection_close(req->flags, req->output_headers);

            /* check if we got asked to close the connection */
            if (need_close)
                  evhttp_connection_reset(evcon);

            if (TAILQ_FIRST(&evcon->requests) != NULL) {
                  /*
                   * We have more requests; reset the connection
                   * and deal with the next request.
                   */
                  if (!evhttp_connected(evcon))
                        evhttp_connection_connect(evcon);
                  else
                        evhttp_request_dispatch(evcon);
            } else if (!need_close) {
                  /*
                   * The connection is going to be persistent, but we
                   * need to detect if the other side closes it.
                   */
                  evhttp_connection_start_detectclose(evcon);
            }
      } else {
            /*
             * incoming connection - we need to leave the request on the
             * connection so that we can reply to it.
             */
            evcon->state = EVCON_WRITING;
      }

      /* notify the user of the request */
      (*req->cb)(req, req->cb_arg);

      /* if this was an outgoing request, we own and it's done. so free it */
      if (con_outgoing) {
            evhttp_request_free(req);
      }
}

/*
 * Handles reading from a chunked request.
 *   return ALL_DATA_READ:
 *     all data has been read
 *   return MORE_DATA_EXPECTED:
 *     more data is expected
 *   return DATA_CORRUPTED:
 *     data is corrupted
 *   return REQUEST_CANCLED:
 *     request was canceled by the user calling evhttp_cancel_request
 */

static enum message_read_status
evhttp_handle_chunked_read(struct evhttp_request *req, struct evbuffer *buf)
{
      int len;

      while ((len = EVBUFFER_LENGTH(buf)) > 0) {
            if (req->ntoread < 0) {
                  /* Read chunk size */
                  ev_int64_t ntoread;
                  char *p = evbuffer_readline(buf);
                  char *endp;
                  int error;
                  if (p == NULL)
                        break;
                  /* the last chunk is on a new line? */
                  if (strlen(p) == 0) {
                        free(p);
                        continue;
                  }
                  ntoread = evutil_strtoll(p, &endp, 16);
                  error = (*p == '\0' ||
                      (*endp != '\0' && *endp != ' ') ||
                      ntoread < 0);
                  free(p);
                  if (error) {
                        /* could not get chunk size */
                        return (DATA_CORRUPTED);
                  }
                  req->ntoread = ntoread;
                  if (req->ntoread == 0) {
                        /* Last chunk */
                        return (ALL_DATA_READ);
                  }
                  continue;
            }

            /* don't have enough to complete a chunk; wait for more */
            if (len < req->ntoread)
                  return (MORE_DATA_EXPECTED);

            /* Completed chunk */
            evbuffer_add(req->input_buffer,
                EVBUFFER_DATA(buf), (size_t)req->ntoread);
            evbuffer_drain(buf, (size_t)req->ntoread);
            req->ntoread = -1;
            if (req->chunk_cb != NULL) {
                  (*req->chunk_cb)(req, req->cb_arg);
                  evbuffer_drain(req->input_buffer,
                      EVBUFFER_LENGTH(req->input_buffer));
            }
      }

      return (MORE_DATA_EXPECTED);
}

static void
evhttp_read_trailer(struct evhttp_connection *evcon, struct evhttp_request *req)
{
      struct evbuffer *buf = evcon->input_buffer;

      switch (evhttp_parse_headers(req, buf)) {
      case DATA_CORRUPTED:
            evhttp_connection_fail(evcon, EVCON_HTTP_INVALID_HEADER);
            break;
      case ALL_DATA_READ:
            event_del(&evcon->ev);
            evhttp_connection_done(evcon);
            break;
      case MORE_DATA_EXPECTED:
      default:
            evhttp_add_event(&evcon->ev, evcon->timeout,
                HTTP_READ_TIMEOUT);
            break;
      }
}

static void
evhttp_read_body(struct evhttp_connection *evcon, struct evhttp_request *req)
{
      struct evbuffer *buf = evcon->input_buffer;
      
      if (req->chunked) {
            switch (evhttp_handle_chunked_read(req, buf)) {
            case ALL_DATA_READ:
                  /* finished last chunk */
                  evcon->state = EVCON_READING_TRAILER;
                  evhttp_read_trailer(evcon, req);
                  return;
            case DATA_CORRUPTED:
                  /* corrupted data */
                  evhttp_connection_fail(evcon,
                      EVCON_HTTP_INVALID_HEADER);
                  return;
            case REQUEST_CANCELED:
                  /* request canceled */
                  evhttp_request_free(req);
                  return;
            case MORE_DATA_EXPECTED:
            default:
                  break;
            }
      } else if (req->ntoread < 0) {
            /* Read until connection close. */
            evbuffer_add_buffer(req->input_buffer, buf);
      } else if (EVBUFFER_LENGTH(buf) >= req->ntoread) {
            /* Completed content length */
            evbuffer_add(req->input_buffer, EVBUFFER_DATA(buf),
                (size_t)req->ntoread);
            evbuffer_drain(buf, (size_t)req->ntoread);
            req->ntoread = 0;
            evhttp_connection_done(evcon);
            return;
      }
      /* Read more! */
      event_set(&evcon->ev, evcon->fd, EV_READ, evhttp_read, evcon);
      EVHTTP_BASE_SET(evcon, &evcon->ev);
      evhttp_add_event(&evcon->ev, evcon->timeout, HTTP_READ_TIMEOUT);
}

/*
 * Reads data into a buffer structure until no more data
 * can be read on the file descriptor or we have read all
 * the data that we wanted to read.
 * Execute callback when done.
 */

void
evhttp_read(int fd, short what, void *arg)
{
      struct evhttp_connection *evcon = arg;
      struct evhttp_request *req = TAILQ_FIRST(&evcon->requests);
      struct evbuffer *buf = evcon->input_buffer;
      int n, len;

      if (what == EV_TIMEOUT) {
            evhttp_connection_fail(evcon, EVCON_HTTP_TIMEOUT);
            return;
      }
      n = evbuffer_read(buf, fd, -1);
      len = EVBUFFER_LENGTH(buf);
      event_debug(("%s: got %d on %d\n", __func__, n, fd));
      
      if (n == -1) {
            if (errno != EINTR && errno != EAGAIN) {
                  event_debug(("%s: evbuffer_read", __func__));
                  evhttp_connection_fail(evcon, EVCON_HTTP_EOF);
            } else {
                  evhttp_add_event(&evcon->ev, evcon->timeout,
                      HTTP_READ_TIMEOUT);        
            }
            return;
      } else if (n == 0) {
            /* Connection closed */
            evhttp_connection_done(evcon);
            return;
      }

      switch (evcon->state) {
      case EVCON_READING_FIRSTLINE:
            evhttp_read_firstline(evcon, req);
            break;
      case EVCON_READING_HEADERS:
            evhttp_read_header(evcon, req);
            break;
      case EVCON_READING_BODY:
            evhttp_read_body(evcon, req);
            break;
      case EVCON_READING_TRAILER:
            evhttp_read_trailer(evcon, req);
            break;
      case EVCON_DISCONNECTED:
      case EVCON_CONNECTING:
      case EVCON_IDLE:
      case EVCON_WRITING:
      default:
            event_errx(1, "%s: illegal connection state %d",
                     __func__, evcon->state);
      }
}

static void
evhttp_write_connectioncb(struct evhttp_connection *evcon, void *arg)
{
      /* This is after writing the request to the server */
      struct evhttp_request *req = TAILQ_FIRST(&evcon->requests);
      assert(req != NULL);

      assert(evcon->state == EVCON_WRITING);

      /* We are done writing our header and are now expecting the response */
      req->kind = EVHTTP_RESPONSE;

      evhttp_start_read(evcon);
}

/*
 * Clean up a connection object
 */

void
00983 evhttp_connection_free(struct evhttp_connection *evcon)
{
      struct evhttp_request *req;

      /* notify interested parties that this connection is going down */
      if (evcon->fd != -1) {
            if (evhttp_connected(evcon) && evcon->closecb != NULL)
                  (*evcon->closecb)(evcon, evcon->closecb_arg);
      }

      /* remove all requests that might be queued on this connection */
      while ((req = TAILQ_FIRST(&evcon->requests)) != NULL) {
            TAILQ_REMOVE(&evcon->requests, req, next);
            evhttp_request_free(req);
      }

      if (evcon->http_server != NULL) {
            struct evhttp *http = evcon->http_server;
            TAILQ_REMOVE(&http->connections, evcon, next);
      }

      if (event_initialized(&evcon->close_ev))
            event_del(&evcon->close_ev);

      if (event_initialized(&evcon->ev))
            event_del(&evcon->ev);
      
      if (evcon->fd != -1)
            EVUTIL_CLOSESOCKET(evcon->fd);

      if (evcon->bind_address != NULL)
            free(evcon->bind_address);

      if (evcon->address != NULL)
            free(evcon->address);

      if (evcon->input_buffer != NULL)
            evbuffer_free(evcon->input_buffer);

      if (evcon->output_buffer != NULL)
            evbuffer_free(evcon->output_buffer);

      free(evcon);
}

void
01029 evhttp_connection_set_local_address(struct evhttp_connection *evcon,
    const char *address)
{
      assert(evcon->state == EVCON_DISCONNECTED);
      if (evcon->bind_address)
            free(evcon->bind_address);
      if ((evcon->bind_address = strdup(address)) == NULL)
            event_err(1, "%s: strdup", __func__);
}

void
01040 evhttp_connection_set_local_port(struct evhttp_connection *evcon,
    unsigned short port)
{
      assert(evcon->state == EVCON_DISCONNECTED);
      evcon->bind_port = port;
}

static void
evhttp_request_dispatch(struct evhttp_connection* evcon)
{
      struct evhttp_request *req = TAILQ_FIRST(&evcon->requests);
      
      /* this should not usually happy but it's possible */
      if (req == NULL)
            return;

      /* delete possible close detection events */
      evhttp_connection_stop_detectclose(evcon);
      
      /* we assume that the connection is connected already */
      assert(evcon->state == EVCON_IDLE);

      evcon->state = EVCON_WRITING;

      /* Create the header from the store arguments */
      evhttp_make_header(evcon, req);

      evhttp_write_buffer(evcon, evhttp_write_connectioncb, NULL);
}

/* Reset our connection state */
void
evhttp_connection_reset(struct evhttp_connection *evcon)
{
      if (event_initialized(&evcon->ev))
            event_del(&evcon->ev);

      if (evcon->fd != -1) {
            /* inform interested parties about connection close */
            if (evhttp_connected(evcon) && evcon->closecb != NULL)
                  (*evcon->closecb)(evcon, evcon->closecb_arg);

            EVUTIL_CLOSESOCKET(evcon->fd);
            evcon->fd = -1;
      }
      evcon->state = EVCON_DISCONNECTED;

      evbuffer_drain(evcon->input_buffer,
          EVBUFFER_LENGTH(evcon->input_buffer));
      evbuffer_drain(evcon->output_buffer,
          EVBUFFER_LENGTH(evcon->output_buffer));
}

static void
evhttp_detect_close_cb(int fd, short what, void *arg)
{
      struct evhttp_connection *evcon = arg;
      evhttp_connection_reset(evcon);
}

static void
evhttp_connection_start_detectclose(struct evhttp_connection *evcon)
{
      evcon->flags |= EVHTTP_CON_CLOSEDETECT;

      if (event_initialized(&evcon->close_ev))
            event_del(&evcon->close_ev);
      event_set(&evcon->close_ev, evcon->fd, EV_READ,
          evhttp_detect_close_cb, evcon);
      EVHTTP_BASE_SET(evcon, &evcon->close_ev);
      event_add(&evcon->close_ev, NULL);
}

static void
evhttp_connection_stop_detectclose(struct evhttp_connection *evcon)
{
      evcon->flags &= ~EVHTTP_CON_CLOSEDETECT;
      event_del(&evcon->close_ev);
}

static void
evhttp_connection_retry(int fd, short what, void *arg)
{
      struct evhttp_connection *evcon = arg;

      evcon->state = EVCON_DISCONNECTED;
      evhttp_connection_connect(evcon);
}

/*
 * Call back for asynchronous connection attempt.
 */

static void
evhttp_connectioncb(int fd, short what, void *arg)
{
      struct evhttp_connection *evcon = arg;
      int error;
      socklen_t errsz = sizeof(error);
            
      if (what == EV_TIMEOUT) {
            event_debug(("%s: connection timeout for \"%s:%d\" on %d",
                  __func__, evcon->address, evcon->port, evcon->fd));
            goto cleanup;
      }

      /* Check if the connection completed */
      if (getsockopt(evcon->fd, SOL_SOCKET, SO_ERROR, (void*)&error,
                   &errsz) == -1) {
            event_debug(("%s: getsockopt for \"%s:%d\" on %d",
                  __func__, evcon->address, evcon->port, evcon->fd));
            goto cleanup;
      }

      if (error) {
            event_debug(("%s: connect failed for \"%s:%d\" on %d: %s",
                __func__, evcon->address, evcon->port, evcon->fd,
                  strerror(error)));
            goto cleanup;
      }

      /* We are connected to the server now */
      event_debug(("%s: connected to \"%s:%d\" on %d\n",
                  __func__, evcon->address, evcon->port, evcon->fd));

      /* Reset the retry count as we were successful in connecting */
      evcon->retry_cnt = 0;
      evcon->state = EVCON_IDLE;

      /* try to start requests that have queued up on this connection */
      evhttp_request_dispatch(evcon);
      return;

 cleanup:
      if (evcon->retry_max < 0 || evcon->retry_cnt < evcon->retry_max) {
            evtimer_set(&evcon->ev, evhttp_connection_retry, evcon);
            EVHTTP_BASE_SET(evcon, &evcon->ev);
            evhttp_add_event(&evcon->ev, MIN(3600, 2 << evcon->retry_cnt),
                HTTP_CONNECT_TIMEOUT);
            evcon->retry_cnt++;
            return;
      }
      evhttp_connection_reset(evcon);

      /* for now, we just signal all requests by executing their callbacks */
      while (TAILQ_FIRST(&evcon->requests) != NULL) {
            struct evhttp_request *request = TAILQ_FIRST(&evcon->requests);
            TAILQ_REMOVE(&evcon->requests, request, next);
            request->evcon = NULL;

            /* we might want to set an error here */
            request->cb(request, request->cb_arg);
            evhttp_request_free(request);
      }
}

/*
 * Check if we got a valid response code.
 */

static int
evhttp_valid_response_code(int code)
{
      if (code == 0)
            return (0);

      return (1);
}

/* Parses the status line of a web server */

static int
evhttp_parse_response_line(struct evhttp_request *req, char *line)
{
      char *protocol;
      char *number;
      char *readable;

      protocol = strsep(&line, " ");
      if (line == NULL)
            return (-1);
      number = strsep(&line, " ");
      if (line == NULL)
            return (-1);
      readable = line;

      if (strcmp(protocol, "HTTP/1.0") == 0) {
            req->major = 1;
            req->minor = 0;
      } else if (strcmp(protocol, "HTTP/1.1") == 0) {
            req->major = 1;
            req->minor = 1;
      } else {
            event_debug(("%s: bad protocol \"%s\"",
                  __func__, protocol));
            return (-1);
      }

      req->response_code = atoi(number);
      if (!evhttp_valid_response_code(req->response_code)) {
            event_debug(("%s: bad response code \"%s\"",
                  __func__, number));
            return (-1);
      }

      if ((req->response_code_line = strdup(readable)) == NULL)
            event_err(1, "%s: strdup", __func__);

      return (0);
}

/* Parse the first line of a HTTP request */

static int
evhttp_parse_request_line(struct evhttp_request *req, char *line)
{
      char *method;
      char *uri;
      char *version;

      /* Parse the request line */
      method = strsep(&line, " ");
      if (line == NULL)
            return (-1);
      uri = strsep(&line, " ");
      if (line == NULL)
            return (-1);
      version = strsep(&line, " ");
      if (line != NULL)
            return (-1);

      /* First line */
      if (strcmp(method, "GET") == 0) {
            req->type = EVHTTP_REQ_GET;
      } else if (strcmp(method, "POST") == 0) {
            req->type = EVHTTP_REQ_POST;
      } else if (strcmp(method, "HEAD") == 0) {
            req->type = EVHTTP_REQ_HEAD;
      } else {
            event_debug(("%s: bad method %s on request %p from %s",
                  __func__, method, req, req->remote_host));
            return (-1);
      }

      if (strcmp(version, "HTTP/1.0") == 0) {
            req->major = 1;
            req->minor = 0;
      } else if (strcmp(version, "HTTP/1.1") == 0) {
            req->major = 1;
            req->minor = 1;
      } else {
            event_debug(("%s: bad version %s on request %p from %s",
                  __func__, version, req, req->remote_host));
            return (-1);
      }

      if ((req->uri = strdup(uri)) == NULL) {
            event_debug(("%s: evhttp_decode_uri", __func__));
            return (-1);
      }

      /* determine if it's a proxy request */
      if (strlen(req->uri) > 0 && req->uri[0] != '/')
            req->flags |= EVHTTP_PROXY_REQUEST;

      return (0);
}

const char *
evhttp_find_header(const struct evkeyvalq *headers, const char *key)
{
      struct evkeyval *header;

      TAILQ_FOREACH(header, headers, next) {
            if (strcasecmp(header->key, key) == 0)
                  return (header->value);
      }

      return (NULL);
}

void
evhttp_clear_headers(struct evkeyvalq *headers)
{
      struct evkeyval *header;

      for (header = TAILQ_FIRST(headers);
          header != NULL;
          header = TAILQ_FIRST(headers)) {
            TAILQ_REMOVE(headers, header, next);
            free(header->key);
            free(header->value);
            free(header);
      }
}

/*
 * Returns 0,  if the header was successfully removed.
 * Returns -1, if the header could not be found.
 */

int
evhttp_remove_header(struct evkeyvalq *headers, const char *key)
{
      struct evkeyval *header;

      TAILQ_FOREACH(header, headers, next) {
            if (strcasecmp(header->key, key) == 0)
                  break;
      }

      if (header == NULL)
            return (-1);

      /* Free and remove the header that we found */
      TAILQ_REMOVE(headers, header, next);
      free(header->key);
      free(header->value);
      free(header);

      return (0);
}

static int
evhttp_header_is_valid_value(const char *value)
{
      const char *p = value;

      while ((p = strpbrk(p, "\r\n")) != NULL) {
            /* we really expect only one new line */
            p += strspn(p, "\r\n");
            /* we expect a space or tab for continuation */
            if (*p != ' ' && *p != '\t')
                  return (0);
      }
      return (1);
}

int
evhttp_add_header(struct evkeyvalq *headers,
    const char *key, const char *value)
{
      event_debug(("%s: key: %s val: %s\n", __func__, key, value));

      if (strchr(key, '\r') != NULL || strchr(key, '\n') != NULL) {
            /* drop illegal headers */
            event_debug(("%s: dropping illegal header key\n", __func__));
            return (-1);
      }
      
      if (!evhttp_header_is_valid_value(value)) {
            event_debug(("%s: dropping illegal header value\n", __func__));
            return (-1);
      }

      return (evhttp_add_header_internal(headers, key, value));
}

static int
evhttp_add_header_internal(struct evkeyvalq *headers,
    const char *key, const char *value)
{
      struct evkeyval *header = calloc(1, sizeof(struct evkeyval));
      if (header == NULL) {
            event_warn("%s: calloc", __func__);
            return (-1);
      }
      if ((header->key = strdup(key)) == NULL) {
            free(header);
            event_warn("%s: strdup", __func__);
            return (-1);
      }
      if ((header->value = strdup(value)) == NULL) {
            free(header->key);
            free(header);
            event_warn("%s: strdup", __func__);
            return (-1);
      }

      TAILQ_INSERT_TAIL(headers, header, next);

      return (0);
}

/*
 * Parses header lines from a request or a response into the specified
 * request object given an event buffer.
 *
 * Returns
 *   DATA_CORRUPTED      on error
 *   MORE_DATA_EXPECTED  when we need to read more headers
 *   ALL_DATA_READ       when all headers have been read.
 */

enum message_read_status
evhttp_parse_firstline(struct evhttp_request *req, struct evbuffer *buffer)
{
      char *line;
      enum message_read_status status = ALL_DATA_READ;

      line = evbuffer_readline(buffer);
      if (line == NULL)
            return (MORE_DATA_EXPECTED);

      switch (req->kind) {
      case EVHTTP_REQUEST:
            if (evhttp_parse_request_line(req, line) == -1)
                  status = DATA_CORRUPTED;
            break;
      case EVHTTP_RESPONSE:
            if (evhttp_parse_response_line(req, line) == -1)
                  status = DATA_CORRUPTED;
            break;
      default:
            status = DATA_CORRUPTED;
      }

      free(line);
      return (status);
}

static int
evhttp_append_to_last_header(struct evkeyvalq *headers, const char *line)
{
      struct evkeyval *header = TAILQ_LAST(headers, evkeyvalq);
      char *newval;
      size_t old_len, line_len;

      if (header == NULL)
            return (-1);

      old_len = strlen(header->value);
      line_len = strlen(line);

      newval = realloc(header->value, old_len + line_len + 1);
      if (newval == NULL)
            return (-1);

      memcpy(newval + old_len, line, line_len + 1);
      header->value = newval;

      return (0);
}

enum message_read_status
evhttp_parse_headers(struct evhttp_request *req, struct evbuffer* buffer)
{
      char *line;
      enum message_read_status status = MORE_DATA_EXPECTED;

      struct evkeyvalq* headers = req->input_headers;
      while ((line = evbuffer_readline(buffer))
             != NULL) {
            char *skey, *svalue;

            if (*line == '\0') { /* Last header - Done */
                  status = ALL_DATA_READ;
                  free(line);
                  break;
            }

            /* Check if this is a continuation line */
            if (*line == ' ' || *line == '\t') {
                  if (evhttp_append_to_last_header(headers, line) == -1)
                        goto error;
                  free(line);
                  continue;
            }

            /* Processing of header lines */
            svalue = line;
            skey = strsep(&svalue, ":");
            if (svalue == NULL)
                  goto error;

            svalue += strspn(svalue, " ");

            if (evhttp_add_header(headers, skey, svalue) == -1)
                  goto error;

            free(line);
      }

      return (status);

 error:
      free(line);
      return (DATA_CORRUPTED);
}

static int
evhttp_get_body_length(struct evhttp_request *req)
{
      struct evkeyvalq *headers = req->input_headers;
      const char *content_length;
      const char *connection;

      content_length = evhttp_find_header(headers, "Content-Length");
      connection = evhttp_find_header(headers, "Connection");
            
      if (content_length == NULL && connection == NULL)
            req->ntoread = -1;
      else if (content_length == NULL &&
          strcasecmp(connection, "Close") != 0) {
            /* Bad combination, we don't know when it will end */
            event_warnx("%s: we got no content length, but the "
                "server wants to keep the connection open: %s.",
                __func__, connection);
            return (-1);
      } else if (content_length == NULL) {
            req->ntoread = -1;
      } else {
            char *endp;
            ev_int64_t ntoread = evutil_strtoll(content_length, &endp, 10);
            if (*content_length == '\0' || *endp != '\0' || ntoread < 0) {
                  event_debug(("%s: illegal content length: %s",
                        __func__, content_length));
                  return (-1);
            }
            req->ntoread = ntoread;
      }
            
      event_debug(("%s: bytes to read: %lld (in buffer %ld)\n",
            __func__, req->ntoread,
            EVBUFFER_LENGTH(req->evcon->input_buffer)));

      return (0);
}

static void
evhttp_get_body(struct evhttp_connection *evcon, struct evhttp_request *req)
{
      const char *xfer_enc;
      
      /* If this is a request without a body, then we are done */
      if (req->kind == EVHTTP_REQUEST && req->type != EVHTTP_REQ_POST) {
            evhttp_connection_done(evcon);
            return;
      }
      evcon->state = EVCON_READING_BODY;
      xfer_enc = evhttp_find_header(req->input_headers, "Transfer-Encoding");
      if (xfer_enc != NULL && strcasecmp(xfer_enc, "chunked") == 0) {
            req->chunked = 1;
            req->ntoread = -1;
      } else {
            if (evhttp_get_body_length(req) == -1) {
                  evhttp_connection_fail(evcon,
                      EVCON_HTTP_INVALID_HEADER);
                  return;
            }
      }
      evhttp_read_body(evcon, req);
}

static void
evhttp_read_firstline(struct evhttp_connection *evcon,
                  struct evhttp_request *req)
{
      enum message_read_status res;

      res = evhttp_parse_firstline(req, evcon->input_buffer);
      if (res == DATA_CORRUPTED) {
            /* Error while reading, terminate */
            event_debug(("%s: bad header lines on %d\n",
                  __func__, evcon->fd));
            evhttp_connection_fail(evcon, EVCON_HTTP_INVALID_HEADER);
            return;
      } else if (res == MORE_DATA_EXPECTED) {
            /* Need more header lines */
            evhttp_add_event(&evcon->ev, 
                    evcon->timeout, HTTP_READ_TIMEOUT);
            return;
      }

      evcon->state = EVCON_READING_HEADERS;
      evhttp_read_header(evcon, req);
}

static void
evhttp_read_header(struct evhttp_connection *evcon, struct evhttp_request *req)
{
      enum message_read_status res;
      int fd = evcon->fd;

      res = evhttp_parse_headers(req, evcon->input_buffer);
      if (res == DATA_CORRUPTED) {
            /* Error while reading, terminate */
            event_debug(("%s: bad header lines on %d\n", __func__, fd));
            evhttp_connection_fail(evcon, EVCON_HTTP_INVALID_HEADER);
            return;
      } else if (res == MORE_DATA_EXPECTED) {
            /* Need more header lines */
            evhttp_add_event(&evcon->ev, 
                evcon->timeout, HTTP_READ_TIMEOUT);
            return;
      }

      /* Done reading headers, do the real work */
      switch (req->kind) {
      case EVHTTP_REQUEST:
            event_debug(("%s: checking for post data on %d\n",
                        __func__, fd));
            evhttp_get_body(evcon, req);
            break;

      case EVHTTP_RESPONSE:
            if (req->response_code == HTTP_NOCONTENT ||
                req->response_code == HTTP_NOTMODIFIED ||
                (req->response_code >= 100 && req->response_code < 200)) {
                  event_debug(("%s: skipping body for code %d\n",
                              __func__, req->response_code));
                  evhttp_connection_done(evcon);
            } else {
                  event_debug(("%s: start of read body for %s on %d\n",
                        __func__, req->remote_host, fd));
                  evhttp_get_body(evcon, req);
            }
            break;

      default:
            event_warnx("%s: bad header on %d", __func__, fd);
            evhttp_connection_fail(evcon, EVCON_HTTP_INVALID_HEADER);
            break;
      }
}

/*
 * Creates a TCP connection to the specified port and executes a callback
 * when finished.  Failure or sucess is indicate by the passed connection
 * object.
 *
 * Although this interface accepts a hostname, it is intended to take
 * only numeric hostnames so that non-blocking DNS resolution can
 * happen elsewhere.
 */

struct evhttp_connection *
01677 evhttp_connection_new(const char *address, unsigned short port)
{
      struct evhttp_connection *evcon = NULL;
      
      event_debug(("Attempting connection to %s:%d\n", address, port));

      if ((evcon = calloc(1, sizeof(struct evhttp_connection))) == NULL) {
            event_warn("%s: calloc failed", __func__);
            goto error;
      }

      evcon->fd = -1;
      evcon->port = port;

      evcon->timeout = -1;
      evcon->retry_cnt = evcon->retry_max = 0;

      if ((evcon->address = strdup(address)) == NULL) {
            event_warn("%s: strdup failed", __func__);
            goto error;
      }

      if ((evcon->input_buffer = evbuffer_new()) == NULL) {
            event_warn("%s: evbuffer_new failed", __func__);
            goto error;
      }

      if ((evcon->output_buffer = evbuffer_new()) == NULL) {
            event_warn("%s: evbuffer_new failed", __func__);
            goto error;
      }
      
      evcon->state = EVCON_DISCONNECTED;
      TAILQ_INIT(&evcon->requests);

      return (evcon);
      
 error:
      if (evcon != NULL)
            evhttp_connection_free(evcon);
      return (NULL);
}

01720 void evhttp_connection_set_base(struct evhttp_connection *evcon,
    struct event_base *base)
{
      assert(evcon->base == NULL);
      assert(evcon->state == EVCON_DISCONNECTED);
      evcon->base = base;
}

void
01729 evhttp_connection_set_timeout(struct evhttp_connection *evcon,
    int timeout_in_secs)
{
      evcon->timeout = timeout_in_secs;
}

void
01736 evhttp_connection_set_retries(struct evhttp_connection *evcon,
    int retry_max)
{
      evcon->retry_max = retry_max;
}

void
01743 evhttp_connection_set_closecb(struct evhttp_connection *evcon,
    void (*cb)(struct evhttp_connection *, void *), void *cbarg)
{
      evcon->closecb = cb;
      evcon->closecb_arg = cbarg;
}

void
01751 evhttp_connection_get_peer(struct evhttp_connection *evcon,
    char **address, u_short *port)
{
      *address = evcon->address;
      *port = evcon->port;
}

int
evhttp_connection_connect(struct evhttp_connection *evcon)
{
      if (evcon->state == EVCON_CONNECTING)
            return (0);
      
      evhttp_connection_reset(evcon);

      assert(!(evcon->flags & EVHTTP_CON_INCOMING));
      evcon->flags |= EVHTTP_CON_OUTGOING;
      
      evcon->fd = bind_socket(
            evcon->bind_address, evcon->bind_port, 0 /*reuse*/);
      if (evcon->fd == -1) {
            event_debug(("%s: failed to bind to \"%s\"",
                  __func__, evcon->bind_address));
            return (-1);
      }

      if (socket_connect(evcon->fd, evcon->address, evcon->port) == -1) {
            EVUTIL_CLOSESOCKET(evcon->fd); evcon->fd = -1;
            return (-1);
      }

      /* Set up a callback for successful connection setup */
      event_set(&evcon->ev, evcon->fd, EV_WRITE, evhttp_connectioncb, evcon);
      EVHTTP_BASE_SET(evcon, &evcon->ev);
      evhttp_add_event(&evcon->ev, evcon->timeout, HTTP_CONNECT_TIMEOUT);

      evcon->state = EVCON_CONNECTING;
      
      return (0);
}

/*
 * Starts an HTTP request on the provided evhttp_connection object.
 * If the connection object is not connected to the web server already,
 * this will start the connection.
 */

int
01799 evhttp_make_request(struct evhttp_connection *evcon,
    struct evhttp_request *req,
    enum evhttp_cmd_type type, const char *uri)
{
      /* We are making a request */
      req->kind = EVHTTP_REQUEST;
      req->type = type;
      if (req->uri != NULL)
            free(req->uri);
      if ((req->uri = strdup(uri)) == NULL)
            event_err(1, "%s: strdup", __func__);

      /* Set the protocol version if it is not supplied */
      if (!req->major && !req->minor) {
            req->major = 1;
            req->minor = 1;
      }
      
      assert(req->evcon == NULL);
      req->evcon = evcon;
      assert(!(req->flags & EVHTTP_REQ_OWN_CONNECTION));
      
      TAILQ_INSERT_TAIL(&evcon->requests, req, next);

      /* If the connection object is not connected; make it so */
      if (!evhttp_connected(evcon))
            return (evhttp_connection_connect(evcon));

      /*
       * If it's connected already and we are the first in the queue,
       * then we can dispatch this request immediately.  Otherwise, it
       * will be dispatched once the pending requests are completed.
       */
      if (TAILQ_FIRST(&evcon->requests) == req)
            evhttp_request_dispatch(evcon);

      return (0);
}

/*
 * Reads data from file descriptor into request structure
 * Request structure needs to be set up correctly.
 */

void
evhttp_start_read(struct evhttp_connection *evcon)
{
      /* Set up an event to read the headers */
      if (event_initialized(&evcon->ev))
            event_del(&evcon->ev);
      event_set(&evcon->ev, evcon->fd, EV_READ, evhttp_read, evcon);
      EVHTTP_BASE_SET(evcon, &evcon->ev);
      
      evhttp_add_event(&evcon->ev, evcon->timeout, HTTP_READ_TIMEOUT);
      evcon->state = EVCON_READING_FIRSTLINE;
}

static void
evhttp_send_done(struct evhttp_connection *evcon, void *arg)
{
      int need_close;
      struct evhttp_request *req = TAILQ_FIRST(&evcon->requests);
      TAILQ_REMOVE(&evcon->requests, req, next);

      /* delete possible close detection events */
      evhttp_connection_stop_detectclose(evcon);
      
      need_close =
          (req->minor == 0 &&
            !evhttp_is_connection_keepalive(req->input_headers))||
          evhttp_is_connection_close(req->flags, req->input_headers) ||
          evhttp_is_connection_close(req->flags, req->output_headers);

      assert(req->flags & EVHTTP_REQ_OWN_CONNECTION);
      evhttp_request_free(req);

      if (need_close) {
            evhttp_connection_free(evcon);
            return;
      } 

      /* we have a persistent connection; try to accept another request. */
      if (evhttp_associate_new_request_with_connection(evcon) == -1)
            evhttp_connection_free(evcon);
}

/*
 * Returns an error page.
 */

void
01890 evhttp_send_error(struct evhttp_request *req, int error, const char *reason)
{
#define ERR_FORMAT "<HTML><HEAD>\n" \
          "<TITLE>%d %s</TITLE>\n" \
          "</HEAD><BODY>\n" \
          "<H1>Method Not Implemented</H1>\n" \
          "Invalid method in request<P>\n" \
          "</BODY></HTML>\n"

      struct evbuffer *buf = evbuffer_new();

      /* close the connection on error */
      evhttp_add_header(req->output_headers, "Connection", "close");

      evhttp_response_code(req, error, reason);

      evbuffer_add_printf(buf, ERR_FORMAT, error, reason);

      evhttp_send_page(req, buf);

      evbuffer_free(buf);
#undef ERR_FORMAT
}

/* Requires that headers and response code are already set up */

static inline void
evhttp_send(struct evhttp_request *req, struct evbuffer *databuf)
{
      struct evhttp_connection *evcon = req->evcon;

      assert(TAILQ_FIRST(&evcon->requests) == req);

      /* xxx: not sure if we really should expose the data buffer this way */
      if (databuf != NULL)
            evbuffer_add_buffer(req->output_buffer, databuf);
      
      /* Adds headers to the response */
      evhttp_make_header(evcon, req);

      evhttp_write_buffer(evcon, evhttp_send_done, NULL);
}

void
01934 evhttp_send_reply(struct evhttp_request *req, int code, const char *reason,
    struct evbuffer *databuf)
{
      evhttp_response_code(req, code, reason);
      
      evhttp_send(req, databuf);
}

void
evhttp_send_reply_start(struct evhttp_request *req, int code,
    const char *reason)
{
      evhttp_response_code(req, code, reason);
      if (req->major == 1 && req->minor == 1) {
            /* use chunked encoding for HTTP/1.1 */
            evhttp_add_header(req->output_headers, "Transfer-Encoding",
                "chunked");
            req->chunked = 1;
      }
      evhttp_make_header(req->evcon, req);
      evhttp_write_buffer(req->evcon, NULL, NULL);
}

void
evhttp_send_reply_chunk(struct evhttp_request *req, struct evbuffer *databuf)
{
      if (req->chunked) {
            evbuffer_add_printf(req->evcon->output_buffer, "%x\r\n",
                            (unsigned)EVBUFFER_LENGTH(databuf));
      }
      evbuffer_add_buffer(req->evcon->output_buffer, databuf);
      if (req->chunked) {
            evbuffer_add(req->evcon->output_buffer, "\r\n", 2);
      }
      evhttp_write_buffer(req->evcon, NULL, NULL);
}

void
evhttp_send_reply_end(struct evhttp_request *req)
{
      struct evhttp_connection *evcon = req->evcon;

      if (req->chunked) {
            evbuffer_add(req->evcon->output_buffer, "0\r\n\r\n", 5);
            evhttp_write_buffer(req->evcon, evhttp_send_done, NULL);
            req->chunked = 0;
      } else if (!event_pending(&evcon->ev, EV_WRITE|EV_TIMEOUT, NULL)) {
            /* let the connection know that we are done with the request */
            evhttp_send_done(evcon, NULL);
      } else {
            /* make the callback execute after all data has been written */
            evcon->cb = evhttp_send_done;
            evcon->cb_arg = NULL;
      }
}

void
evhttp_response_code(struct evhttp_request *req, int code, const char *reason)
{
      req->kind = EVHTTP_RESPONSE;
      req->response_code = code;
      if (req->response_code_line != NULL)
            free(req->response_code_line);
      req->response_code_line = strdup(reason);
}

void
evhttp_send_page(struct evhttp_request *req, struct evbuffer *databuf)
{
      if (!req->major || !req->minor) {
            req->major = 1;
            req->minor = 1;
      }
      
      if (req->kind != EVHTTP_RESPONSE)
            evhttp_response_code(req, 200, "OK");

      evhttp_clear_headers(req->output_headers);
      evhttp_add_header(req->output_headers, "Content-Type", "text/html");
      evhttp_add_header(req->output_headers, "Connection", "close");

      evhttp_send(req, databuf);
}

static const char uri_chars[256] = {
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 1, 0, 0, 1, 0, 0, 1,   1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 0, 0, 1, 0, 0,
      /* 64 */
      1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 0, 0, 0, 0, 1,
      0, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 0, 0, 0, 1, 0,
      /* 128 */
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      /* 192 */
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
};

/*
 * Helper functions to encode/decode a URI.
 * The returned string must be freed by the caller.
 */
char *
02045 evhttp_encode_uri(const char *uri)
{
      struct evbuffer *buf = evbuffer_new();
      char *p;

      for (p = (char *)uri; *p != '\0'; p++) {
            if (uri_chars[(u_char)(*p)]) {
                  evbuffer_add(buf, p, 1);
            } else {
                  evbuffer_add_printf(buf, "%%%02X", (u_char)(*p));
            }
      }
      evbuffer_add(buf, "", 1);
      p = strdup((char *)EVBUFFER_DATA(buf));
      evbuffer_free(buf);
      
      return (p);
}

/*
 * @param always_decode_plus: when true we transform plus to space even
 *     if we have not seen a ?.
 */
static int
evhttp_decode_uri_internal(
      const char *uri, size_t length, char *ret, int always_decode_plus)
{
      char c;
      int i, j, in_query = always_decode_plus;
      
      for (i = j = 0; uri[i] != '\0'; i++) {
            c = uri[i];
            if (c == '?') {
                  in_query = 1;
            } else if (c == '+' && in_query) {
                  c = ' ';
            } else if (c == '%' && isxdigit((unsigned char)uri[i+1]) &&
                isxdigit((unsigned char)uri[i+2])) {
                  char tmp[] = { uri[i+1], uri[i+2], '\0' };
                  c = (char)strtol(tmp, NULL, 16);
                  i += 2;
            }
            ret[j++] = c;
      }
      ret[j] = '\0';

      return (j);
}

char *
02095 evhttp_decode_uri(const char *uri)
{
      char *ret;

      if ((ret = malloc(strlen(uri) + 1)) == NULL)
            event_err(1, "%s: malloc(%lu)", __func__,
                    (unsigned long)(strlen(uri) + 1));

      evhttp_decode_uri_internal(uri, strlen(uri),
          ret, 0 /*always_decode_plus*/);

      return (ret);
}

/* 
 * Helper function to parse out arguments in a query.
 * The arguments are separated by key and value.
 */

void
02115 evhttp_parse_query(const char *uri, struct evkeyvalq *headers)
{
      char *line;
      char *argument;
      char *p;

      TAILQ_INIT(headers);

      /* No arguments - we are done */
      if (strchr(uri, '?') == NULL)
            return;

      if ((line = strdup(uri)) == NULL)
            event_err(1, "%s: strdup", __func__);


      argument = line;

      /* We already know that there has to be a ? */
      strsep(&argument, "?");

      p = argument;
      while (p != NULL && *p != '\0') {
            char *key, *value, *decoded_value;
            argument = strsep(&p, "&");

            value = argument;
            key = strsep(&value, "=");
            if (value == NULL)
                  goto error;

            if ((decoded_value = malloc(strlen(value) + 1)) == NULL)
                  event_err(1, "%s: malloc", __func__);

            evhttp_decode_uri_internal(value, strlen(value),
                decoded_value, 1 /*always_decode_plus*/);
            event_debug(("Query Param: %s -> %s\n", key, decoded_value));
            evhttp_add_header_internal(headers, key, decoded_value);
            free(decoded_value);
      }

 error:
      free(line);
}

static struct evhttp_cb *
evhttp_dispatch_callback(struct httpcbq *callbacks, struct evhttp_request *req)
{
      struct evhttp_cb *cb;
      size_t offset = 0;

      /* Test for different URLs */
      char *p = strchr(req->uri, '?');
      if (p != NULL)
            offset = (size_t)(p - req->uri);

      TAILQ_FOREACH(cb, callbacks, next) {
            int res = 0;
            if (p == NULL) {
                  res = strcmp(cb->what, req->uri) == 0;
            } else {
                  res = ((strncmp(cb->what, req->uri, offset) == 0) &&
                              (cb->what[offset] == '\0'));
            }

            if (res)
                  return (cb);
      }

      return (NULL);
}

static void
evhttp_handle_request(struct evhttp_request *req, void *arg)
{
      struct evhttp *http = arg;
      struct evhttp_cb *cb = NULL;

      if (req->uri == NULL) {
            evhttp_send_error(req, HTTP_BADREQUEST, "Bad Request");
            return;
      }

      if ((cb = evhttp_dispatch_callback(&http->callbacks, req)) != NULL) {
            (*cb->cb)(req, cb->cbarg);
            return;
      }

      /* Generic call back */
      if (http->gencb) {
            (*http->gencb)(req, http->gencbarg);
            return;
      } else {
            /* We need to send a 404 here */
#define ERR_FORMAT "<html><head>" \
                "<title>404 Not Found</title>" \
                "</head><body>" \
                "<h1>Not Found</h1>" \
                "<p>The requested URL %s was not found on this server.</p>"\
                "</body></html>\n"

            char *escaped_html = evhttp_htmlescape(req->uri);
            struct evbuffer *buf = evbuffer_new();

            evhttp_response_code(req, HTTP_NOTFOUND, "Not Found");

            evbuffer_add_printf(buf, ERR_FORMAT, escaped_html);

            free(escaped_html);

            evhttp_send_page(req, buf);

            evbuffer_free(buf);
#undef ERR_FORMAT
      }
}

static void
accept_socket(int fd, short what, void *arg)
{
      struct evhttp *http = arg;
      struct sockaddr_storage ss;
      socklen_t addrlen = sizeof(ss);
      int nfd;

      if ((nfd = accept(fd, (struct sockaddr *)&ss, &addrlen)) == -1) {
            if (errno != EAGAIN && errno != EINTR)
                  event_warn("%s: bad accept", __func__);
            return;
      }
      if (evutil_make_socket_nonblocking(nfd) < 0)
            return;

      evhttp_get_request(http, nfd, (struct sockaddr *)&ss, addrlen);
}

int
02252 evhttp_bind_socket(struct evhttp *http, const char *address, u_short port)
{
      int fd;
      int res;

      if ((fd = bind_socket(address, port, 1 /*reuse*/)) == -1)
            return (-1);

      if (listen(fd, 128) == -1) {
            event_warn("%s: listen", __func__);
            EVUTIL_CLOSESOCKET(fd);
            return (-1);
      }

      res = evhttp_accept_socket(http, fd);
      
      if (res != -1)
            event_debug(("Bound to port %d - Awaiting connections ... ",
                  port));

      return (res);
}

int
02276 evhttp_accept_socket(struct evhttp *http, int fd)
{
      struct evhttp_bound_socket *bound;
      struct event *ev;
      int res;

      bound = malloc(sizeof(struct evhttp_bound_socket));
      if (bound == NULL)
            return (-1);

      ev = &bound->bind_ev;

      /* Schedule the socket for accepting */
      event_set(ev, fd, EV_READ | EV_PERSIST, accept_socket, http);
      EVHTTP_BASE_SET(http, ev);

      res = event_add(ev, NULL);

      if (res == -1) {
            free(bound);
            return (-1);
      }

      TAILQ_INSERT_TAIL(&http->sockets, bound, next);

      return (0);
}

static struct evhttp*
evhttp_new_object(void)
{
      struct evhttp *http = NULL;

      if ((http = calloc(1, sizeof(struct evhttp))) == NULL) {
            event_warn("%s: calloc", __func__);
            return (NULL);
      }

      http->timeout = -1;

      TAILQ_INIT(&http->sockets);
      TAILQ_INIT(&http->callbacks);
      TAILQ_INIT(&http->connections);

      return (http);
}

struct evhttp *
02324 evhttp_new(struct event_base *base)
{
      struct evhttp *http = evhttp_new_object();

      http->base = base;

      return (http);
}

/*
 * Start a web server on the specified address and port.
 */

struct evhttp *
02338 evhttp_start(const char *address, u_short port)
{
      struct evhttp *http = evhttp_new_object();

      if (evhttp_bind_socket(http, address, port) == -1) {
            free(http);
            return (NULL);
      }

      return (http);
}

void
02351 evhttp_free(struct evhttp* http)
{
      struct evhttp_cb *http_cb;
      struct evhttp_connection *evcon;
      struct evhttp_bound_socket *bound;
      int fd;

      /* Remove the accepting part */
      while ((bound = TAILQ_FIRST(&http->sockets)) != NULL) {
            TAILQ_REMOVE(&http->sockets, bound, next);

            fd = bound->bind_ev.ev_fd;
            event_del(&bound->bind_ev);
            EVUTIL_CLOSESOCKET(fd);

            free(bound);
      }

      while ((evcon = TAILQ_FIRST(&http->connections)) != NULL) {
            /* evhttp_connection_free removes the connection */
            evhttp_connection_free(evcon);
      }

      while ((http_cb = TAILQ_FIRST(&http->callbacks)) != NULL) {
            TAILQ_REMOVE(&http->callbacks, http_cb, next);
            free(http_cb->what);
            free(http_cb);
      }
      
      free(http);
}

void
02384 evhttp_set_timeout(struct evhttp* http, int timeout_in_secs)
{
      http->timeout = timeout_in_secs;
}

void
02390 evhttp_set_cb(struct evhttp *http, const char *uri,
    void (*cb)(struct evhttp_request *, void *), void *cbarg)
{
      struct evhttp_cb *http_cb;

      if ((http_cb = calloc(1, sizeof(struct evhttp_cb))) == NULL)
            event_err(1, "%s: calloc", __func__);

      http_cb->what = strdup(uri);
      http_cb->cb = cb;
      http_cb->cbarg = cbarg;

      TAILQ_INSERT_TAIL(&http->callbacks, http_cb, next);
}

int
02406 evhttp_del_cb(struct evhttp *http, const char *uri)
{
      struct evhttp_cb *http_cb;

      TAILQ_FOREACH(http_cb, &http->callbacks, next) {
            if (strcmp(http_cb->what, uri) == 0)
                  break;
      }
      if (http_cb == NULL)
            return (-1);

      TAILQ_REMOVE(&http->callbacks, http_cb, next);
      free(http_cb->what);
      free(http_cb);

      return (0);
}

void
02425 evhttp_set_gencb(struct evhttp *http,
    void (*cb)(struct evhttp_request *, void *), void *cbarg)
{
      http->gencb = cb;
      http->gencbarg = cbarg;
}

/*
 * Request related functions
 */

struct evhttp_request *
02437 evhttp_request_new(void (*cb)(struct evhttp_request *, void *), void *arg)
{
      struct evhttp_request *req = NULL;

      /* Allocate request structure */
      if ((req = calloc(1, sizeof(struct evhttp_request))) == NULL) {
            event_warn("%s: calloc", __func__);
            goto error;
      }

      req->kind = EVHTTP_RESPONSE;
      req->input_headers = calloc(1, sizeof(struct evkeyvalq));
      if (req->input_headers == NULL) {
            event_warn("%s: calloc", __func__);
            goto error;
      }
      TAILQ_INIT(req->input_headers);

      req->output_headers = calloc(1, sizeof(struct evkeyvalq));
      if (req->output_headers == NULL) {
            event_warn("%s: calloc", __func__);
            goto error;
      }
      TAILQ_INIT(req->output_headers);

      if ((req->input_buffer = evbuffer_new()) == NULL) {
            event_warn("%s: evbuffer_new", __func__);
            goto error;
      }

      if ((req->output_buffer = evbuffer_new()) == NULL) {
            event_warn("%s: evbuffer_new", __func__);
            goto error;
      }

      req->cb = cb;
      req->cb_arg = arg;

      return (req);

 error:
      if (req != NULL)
            evhttp_request_free(req);
      return (NULL);
}

void
02484 evhttp_request_free(struct evhttp_request *req)
{
      if (req->remote_host != NULL)
            free(req->remote_host);
      if (req->uri != NULL)
            free(req->uri);
      if (req->response_code_line != NULL)
            free(req->response_code_line);

      evhttp_clear_headers(req->input_headers);
      free(req->input_headers);

      evhttp_clear_headers(req->output_headers);
      free(req->output_headers);

      if (req->input_buffer != NULL)
            evbuffer_free(req->input_buffer);

      if (req->output_buffer != NULL)
            evbuffer_free(req->output_buffer);

      free(req);
}

void
02509 evhttp_request_set_chunked_cb(struct evhttp_request *req,
    void (*cb)(struct evhttp_request *, void *))
{
      req->chunk_cb = cb;
}

/*
 * Allows for inspection of the request URI
 */

const char *
evhttp_request_uri(struct evhttp_request *req) {
      if (req->uri == NULL)
            event_debug(("%s: request %p has no uri\n", __func__, req));
      return (req->uri);
}

/*
 * Takes a file descriptor to read a request from.
 * The callback is executed once the whole request has been read.
 */

static struct evhttp_connection*
evhttp_get_request_connection(
      struct evhttp* http,
      int fd, struct sockaddr *sa, socklen_t salen)
{
      struct evhttp_connection *evcon;
      char *hostname = NULL, *portname = NULL;

      name_from_addr(sa, salen, &hostname, &portname);
      if (hostname == NULL || portname == NULL) {
            if (hostname) free(hostname);
            if (portname) free(portname);
            return (NULL);
      }

      event_debug(("%s: new request from %s:%s on %d\n",
                  __func__, hostname, portname, fd));

      /* we need a connection object to put the http request on */
      evcon = evhttp_connection_new(hostname, atoi(portname));
      free(hostname);
      free(portname);
      if (evcon == NULL)
            return (NULL);

      /* associate the base if we have one*/
      evhttp_connection_set_base(evcon, http->base);

      evcon->flags |= EVHTTP_CON_INCOMING;
      evcon->state = EVCON_READING_FIRSTLINE;
      
      evcon->fd = fd;

      return (evcon);
}

static int
evhttp_associate_new_request_with_connection(struct evhttp_connection *evcon)
{
      struct evhttp *http = evcon->http_server;
      struct evhttp_request *req;
      if ((req = evhttp_request_new(evhttp_handle_request, http)) == NULL)
            return (-1);

      req->evcon = evcon;     /* the request ends up owning the connection */
      req->flags |= EVHTTP_REQ_OWN_CONNECTION;
      
      TAILQ_INSERT_TAIL(&evcon->requests, req, next);
      
      req->kind = EVHTTP_REQUEST;
      
      if ((req->remote_host = strdup(evcon->address)) == NULL)
            event_err(1, "%s: strdup", __func__);
      req->remote_port = evcon->port;

      evhttp_start_read(evcon);
      
      return (0);
}

void
evhttp_get_request(struct evhttp *http, int fd,
    struct sockaddr *sa, socklen_t salen)
{
      struct evhttp_connection *evcon;

      evcon = evhttp_get_request_connection(http, fd, sa, salen);
      if (evcon == NULL)
            return;

      /* the timeout can be used by the server to close idle connections */
      if (http->timeout != -1)
            evhttp_connection_set_timeout(evcon, http->timeout);

      /* 
       * if we want to accept more than one request on a connection,
       * we need to know which http server it belongs to.
       */
      evcon->http_server = http;
      TAILQ_INSERT_TAIL(&http->connections, evcon, next);
      
      if (evhttp_associate_new_request_with_connection(evcon) == -1)
            evhttp_connection_free(evcon);
}


/*
 * Network helper functions that we do not want to export to the rest of
 * the world.
 */
#if 0 /* Unused */
static struct addrinfo *
addr_from_name(char *address)
{
#ifdef HAVE_GETADDRINFO
        struct addrinfo ai, *aitop;
        int ai_result;

        memset(&ai, 0, sizeof(ai));
        ai.ai_family = AF_INET;
        ai.ai_socktype = SOCK_RAW;
        ai.ai_flags = 0;
        if ((ai_result = getaddrinfo(address, NULL, &ai, &aitop)) != 0) {
                if ( ai_result == EAI_SYSTEM )
                        event_warn("getaddrinfo");
                else
                        event_warnx("getaddrinfo: %s", gai_strerror(ai_result));
        }

      return (aitop);
#else
      assert(0);
      return NULL; /* XXXXX Use gethostbyname, if this function is ever used. */
#endif
}
#endif

static void
name_from_addr(struct sockaddr *sa, socklen_t salen,
    char **phost, char **pport)
{
      char ntop[NI_MAXHOST];
      char strport[NI_MAXSERV];
      int ni_result;

#ifdef HAVE_GETNAMEINFO
      ni_result = getnameinfo(sa, salen,
            ntop, sizeof(ntop), strport, sizeof(strport),
            NI_NUMERICHOST|NI_NUMERICSERV);
      
      if (ni_result != 0) {
            if (ni_result == EAI_SYSTEM)
                  event_err(1, "getnameinfo failed");
            else
                  event_errx(1, "getnameinfo failed: %s", gai_strerror(ni_result));
            return;
      }
#else
      ni_result = fake_getnameinfo(sa, salen,
            ntop, sizeof(ntop), strport, sizeof(strport),
            NI_NUMERICHOST|NI_NUMERICSERV);
      if (ni_result != 0)
                  return;
#endif
      *phost = strdup(ntop);
      *pport = strdup(strport);
}

/* Create a non-blocking socket and bind it */
/* todo: rename this function */
static int
bind_socket_ai(struct addrinfo *ai, int reuse)
{
        int fd, on = 1, r;
      int serrno;

        /* Create listen socket */
        fd = socket(AF_INET, SOCK_STREAM, 0);
        if (fd == -1) {
                event_warn("socket");
                return (-1);
        }

        if (evutil_make_socket_nonblocking(fd) < 0)
                goto out;

#ifndef WIN32
        if (fcntl(fd, F_SETFD, 1) == -1) {
                event_warn("fcntl(F_SETFD)");
                goto out;
        }
#endif

        setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on));
      if (reuse) {
            setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
                (void *)&on, sizeof(on));
      }

      if (ai != NULL) {
            r = bind(fd, ai->ai_addr, ai->ai_addrlen);
            if (r == -1)
                  goto out;
      }

      return (fd);

 out:
      serrno = EVUTIL_SOCKET_ERROR();
      EVUTIL_CLOSESOCKET(fd);
      EVUTIL_SET_SOCKET_ERROR(serrno);
      return (-1);
}

static struct addrinfo *
make_addrinfo(const char *address, u_short port)
{
        struct addrinfo *aitop = NULL;

#ifdef HAVE_GETADDRINFO
        struct addrinfo ai;
        char strport[NI_MAXSERV];
        int ai_result;

        memset(&ai, 0, sizeof(ai));
        ai.ai_family = AF_INET;
        ai.ai_socktype = SOCK_STREAM;
        ai.ai_flags = AI_PASSIVE;  /* turn NULL host name into INADDR_ANY */
        evutil_snprintf(strport, sizeof(strport), "%d", port);
        if ((ai_result = getaddrinfo(address, strport, &ai, &aitop)) != 0) {
                if ( ai_result == EAI_SYSTEM )
                        event_warn("getaddrinfo");
                else
                        event_warnx("getaddrinfo: %s", gai_strerror(ai_result));
            return (NULL);
        }
#else
      static int cur;
      static struct addrinfo ai[2]; /* We will be returning the address of some of this memory so it has to last even after this call. */
      if (++cur == 2) cur = 0;   /* allow calling this function twice */

      if (fake_getaddrinfo(address, &ai[cur]) < 0) {
            event_warn("fake_getaddrinfo");
            return (NULL);
      }
      aitop = &ai[cur];
      ((struct sockaddr_in *) aitop->ai_addr)->sin_port = htons(port);
#endif

      return (aitop);
}

static int
bind_socket(const char *address, u_short port, int reuse)
{
      int fd;
      struct addrinfo *aitop = NULL;

      /* just create an unbound socket */
      if (address == NULL && port == 0)
            return bind_socket_ai(NULL, 0);
            
      aitop = make_addrinfo(address, port);

      if (aitop == NULL)
            return (-1);

      fd = bind_socket_ai(aitop, reuse);

#ifdef HAVE_GETADDRINFO
      freeaddrinfo(aitop);
#else
      fake_freeaddrinfo(aitop);
#endif

      return (fd);
}

static int
socket_connect(int fd, const char *address, unsigned short port)
{
      struct addrinfo *ai = make_addrinfo(address, port);
      int res = -1;

      if (ai == NULL) {
            event_debug(("%s: make_addrinfo: \"%s:%d\"",
                  __func__, address, port));
            return (-1);
      }

      if (connect(fd, ai->ai_addr, ai->ai_addrlen) == -1) {
#ifdef WIN32
            int tmp_error = WSAGetLastError();
            if (tmp_error != WSAEWOULDBLOCK && tmp_error != WSAEINVAL &&
                tmp_error != WSAEINPROGRESS) {
                  goto out;
            }
#else
            if (errno != EINPROGRESS) {
                  goto out;
            }
#endif
      }

      /* everything is fine */
      res = 0;

out:
#ifdef HAVE_GETADDRINFO
      freeaddrinfo(ai);
#else
      fake_freeaddrinfo(ai);
#endif

      return (res);
}

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