http.c

浏览器的源代码,可移植到嵌入式设备.

/*
 * File: http.c
 *
 * Copyright (C) 2000, 2001 Jorge Arellano Cid <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

/*
 * HTTP connect functions
 */


#include <config.h>

#include <unistd.h>
#include <errno.h>              /* for errno */
#include <string.h>             /* for strstr */
#include <stdlib.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/socket.h>         /* for lots of socket stuff */
#include <netinet/in.h>         /* for ntohl and stuff */
#include <arpa/inet.h>          /* for inet_ntop */

#include "Url.h"
#include "IO.h"
#include "../klist.h"
#include "../dns.h"
#include "../cache.h"
#include "../web.h"
#include "../interface.h"
#include "../cookies.h"
#include "../prefs.h"
#include "../misc.h"

/* Used to send a message to the bw's status bar */
#define BW_MSG(web, root, fmt...)                                     \
G_STMT_START {                                                        \
   if (a_Web_valid((web)) && (!(root) || (web)->flags & WEB_RootUrl)) \
      a_Interface_msg((web)->bw, fmt);                                \
} G_STMT_END

#define DEBUG_LEVEL 5
#include "../debug.h"



/* 'Url' and 'web' are just references (no need to deallocate them here). */
typedef struct {
   gint SockFD;
   const DilloUrl *Url;    /* reference to original URL */
   guint port;             /* need a separate port in order to support PROXY */
   gboolean use_proxy;     /* indicates whether to use proxy or not */
   DilloWeb *web;          /* reference to client's web structure */
   GSList *addr_list;      /* Holds the DNS answer */
   GSList *addr_list_iter; /* Points to address currently being used */
   GIOChannel *GioCh;      /* GIOChannel to monitor the connecting process */
   gint Err;               /* Holds the errno of the connect() call */
   ChainLink *Info;        /* Used for CCC asynchronous operations */
} SocketData_t;


/*
 * Local data
 */
static Klist_t *ValidSocks = NULL; /* Active sockets list. It holds pointers to
                                    * SocketData_t structures. */

static DilloUrl *HTTP_Proxy = NULL;
static gchar *HTTP_Proxy_Auth_base64 = NULL;

/*
 * Initialize proxy vars.
 */
gint a_Http_init(void)
{
   gchar *env_proxy = getenv("http_proxy");

   if (env_proxy && strlen(env_proxy))
      HTTP_Proxy = a_Url_new(env_proxy, NULL, 0, 0, 0);
   if (!HTTP_Proxy && prefs.http_proxy)
      HTTP_Proxy = a_Url_dup(prefs.http_proxy);

/*  This allows for storing the proxy password in "user:passwd" format
 * in dillorc, but as this constitutes a security problem, it was disabled.
 *
   if (HTTP_Proxy && prefs.http_proxyuser && strchr(prefs.http_proxyuser, ':'))
      HTTP_Proxy_Auth_base64 = a_Misc_encode_base64(prefs.http_proxyuser);
 */
   return 0;
}

/*
 * Tell whether the proxy auth is already set (user:password)
 * Return: 1 Yes, 0 No
 */
gint a_Http_proxy_auth(void)
{
   return (HTTP_Proxy_Auth_base64 ? 1 : 0);
}

/*
 * Activate entered proxy password for HTTP.
 */
void a_Http_set_proxy_passwd(gchar *str)
{
   gchar *http_proxyauth = g_strconcat(prefs.http_proxyuser, ":", str, NULL);
   HTTP_Proxy_Auth_base64 = a_Misc_encode_base64(http_proxyauth);
   g_free(http_proxyauth);
}

/*
 * Forward declarations
 */
static void Http_send_query(ChainLink *Info, SocketData_t *S);
static int Http_connect_socket(ChainLink *Info);

/*
 * Create and init a new SocketData_t struct, insert into ValidSocks,
 * and return a primary key for it.
 */
static gint Http_sock_new(void)
{
   SocketData_t *S = g_new0(SocketData_t, 1);
   return a_Klist_insert(&ValidSocks, (gpointer)S);
}

/*
 * Free SocketData_t struct
 */
static void Http_socket_free(gint SKey)
{
   SocketData_t *S;

   if ((S = a_Klist_get_data(ValidSocks, SKey))) {
      a_Klist_remove(ValidSocks, SKey);
      if (S->GioCh)
        g_io_channel_unref(S->GioCh);
      g_free(S);
   }
}

/*
 * Make the http query string
 */
gchar *a_Http_make_query_str(const DilloUrl *url, gboolean use_proxy)
{
   gchar *str, *ptr, *cookies;
   GString *s_port     = g_string_new(""),
           *query      = g_string_new(""),
           *full_path  = g_string_new(""),
           *proxy_auth = g_string_new("");

   /* Sending the default port in the query may cause a 302-answer.  --Jcid */
   if (URL_PORT(url) && URL_PORT(url) != DILLO_URL_HTTP_PORT)
      g_string_sprintfa(s_port, ":%d", URL_PORT(url));

   if (use_proxy) {
      g_string_sprintfa(full_path, "%s%s",
                        URL_STR(url),
                        (URL_PATH_(url) || URL_QUERY_(url)) ? "" : "/");
      if ((ptr = strrchr(full_path->str, '#')))
         g_string_truncate(full_path, ptr - full_path->str);
      if (HTTP_Proxy_Auth_base64)
         g_string_sprintf(proxy_auth, "Proxy-Authorization: Basic %s\r\n",
                          HTTP_Proxy_Auth_base64);
   } else {
      g_string_sprintfa(full_path, "%s%s%s%s",
                        URL_PATH(url),
                        URL_QUERY_(url) ? "?" : "",
                        URL_QUERY(url),
                        (URL_PATH_(url) || URL_QUERY_(url)) ? "" : "/");
   }

   cookies = a_Cookies_get(url);
   if ( URL_FLAGS(url) & URL_Post ){
      g_string_sprintfa(
         query,
         "POST %s HTTP/1.0\r\n"
         "Host: %s%s\r\n"
         "%s"
         "User-Agent: Dillo/%s\r\n"
         "Cookie2: $Version=\"1\"\r\n"
         "%s"
         "Content-type: application/x-www-form-urlencoded\r\n"
         "Content-length: %ld\r\n"
         "\r\n"
         "%s",
         full_path->str, URL_HOST(url), s_port->str,
         proxy_auth->str, VERSION, cookies,
         (glong)strlen(URL_DATA(url)),
         URL_DATA(url));

   } else {
      g_string_sprintfa(
         query,
         "GET %s HTTP/1.0\r\n"
         "%s"
         "Host: %s%s\r\n"
         "%s"
         "User-Agent: Dillo/%s\r\n"
         "Cookie2: $Version=\"1\"\r\n"
         "%s"
         "\r\n",
         full_path->str,
         (URL_FLAGS(url) & URL_E2EReload) ?
            "Cache-Control: no-cache\r\nPragma: no-cache\r\n" : "",
         URL_HOST(url), s_port->str,
         proxy_auth->str,
         VERSION,
         cookies);
   }
   g_free(cookies);

   str = query->str;
   g_string_free(query, FALSE);
   g_string_free(s_port, TRUE);
   g_string_free(full_path, TRUE);
   g_string_free(proxy_auth, TRUE);
   DEBUG_MSG(4, "Query:\n%s", str);
   return str;
}

/*
 * This function is called after the socket has been successfuly connected,
 * or upon an error condition on the connecting process.
 * Task: use the socket to send the HTTP-query and expect its answer
 */
static gboolean
 Http_use_socket(GIOChannel *src, GIOCondition cond, gpointer data)
{
   ChainLink *Info;
   SocketData_t *S;
   gint SKey = GPOINTER_TO_INT(data);

   DEBUG_MSG(3, "Http_use_socket: %s [errno %d] [GIOcond %d]\n",
             g_strerror(errno), errno, cond);

   /* This check is required because glib may asynchronously
    * call this function with data that's no longer used  --Jcid   */
   if ( !(S = a_Klist_get_data(ValidSocks, SKey)) )
      return FALSE;

   Info = S->Info;
   if ( cond & G_IO_HUP ) {
      DEBUG_MSG(3, "--Connection broken\n");
      /* get rid of S->GioCh */
      g_io_channel_close(S->GioCh);
      g_io_channel_unref(S->GioCh);
      S->GioCh = NULL;
      if (S->addr_list_iter->next) {
         S->addr_list_iter = S->addr_list_iter->next;
         if (Http_connect_socket(Info) < 0) {
            BW_MSG(S->web, 0, "ERROR: unable to connect to remote host");
            Http_socket_free(SKey);
            a_Chain_fcb(OpAbort, Info, NULL, NULL);
         }
      }
   } else if ( S->Err ) {
      BW_MSG(S->web, 0, "ERROR: %s", g_strerror(S->Err));
      DEBUG_MSG(3, "Http_use_socket ERROR: %s\n", g_strerror(S->Err));
      a_Chain_fcb(OpAbort, Info, NULL, NULL);
      g_io_channel_close(S->GioCh);
      Http_socket_free(SKey);
   } else if ( cond & G_IO_OUT ) {
      DEBUG_MSG(3, "--Connection established\n");
      g_io_channel_unref(S->GioCh);
      S->GioCh = NULL;
      Http_send_query(Info, S);
   }
   return FALSE;
}

/*
 * This function gets called after the DNS succeeds solving a hostname.
 * Task: Finish socket setup and start connecting the socket.
 * Return value: 0 on success;  -1 on error.
 */
static int Http_connect_socket(ChainLink *Info)
{