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|
/* tinyproxy - A fast light-weight HTTP proxy
* Copyright (C) 1998 Steven Young <sdyoung@miranda.org>
* Copyright (C) 1999-2005 Robert James Kaes <rjkaes@users.sourceforge.net>
* Copyright (C) 2000 Chris Lightfoot <chris@ex-parrot.com>
* Copyright (C) 2002 Petr Lampa <lampa@fit.vutbr.cz>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* This is where all the work in tinyproxy is actually done. Incoming
* connections have a new child created for them. The child then
* processes the headers from the client, the response from the server,
* and then relays the bytes between the two.
*/
#include "main.h"
#include "acl.h"
#include "anonymous.h"
#include "buffer.h"
#include "conns.h"
#include "filter.h"
#include "hashmap.h"
#include "heap.h"
#include "html-error.h"
#include "log.h"
#include "network.h"
#include "reqs.h"
#include "sock.h"
#include "stats.h"
#include "text.h"
#include "utils.h"
#include "vector.h"
#include "reverse-proxy.h"
#include "transparent-proxy.h"
/*
* Maximum length of a HTTP line
*/
#define HTTP_LINE_LENGTH (MAXBUFFSIZE / 6)
/*
* Macro to help test if the Upstream proxy supported is compiled in and
* enabled.
*/
#ifdef UPSTREAM_SUPPORT
# define UPSTREAM_CONFIGURED() (config.upstream_list != NULL)
# define UPSTREAM_HOST(host) upstream_get(host)
#else
# define UPSTREAM_CONFIGURED() (0)
# define UPSTREAM_HOST(host) (NULL)
#endif
/*
* Codify the test for the carriage return and new line characters.
*/
#define CHECK_CRLF(header, len) \
(((len) == 1 && header[0] == '\n') || \
((len) == 2 && header[0] == '\r' && header[1] == '\n'))
/*
* Codify the test for header fields folded over multiple lines.
*/
#define CHECK_LWS(header, len) \
((len) > 0 && (header[0] == ' ' || header[0] == '\t'))
/*
* This is a global variable which stores which ports are allowed by
* the CONNECT method. It's a security thing.
*/
static vector_t ports_allowed_by_connect = NULL;
/*
* Now, this routine adds a "port" to the list. It also creates the list if
* it hasn't already by done.
*/
void
add_connect_port_allowed (int port)
{
if (!ports_allowed_by_connect)
{
ports_allowed_by_connect = vector_create ();
if (!ports_allowed_by_connect)
{
log_message (LOG_WARNING,
"Could not create a list of allowed CONNECT ports");
return;
}
}
log_message (LOG_INFO, "Adding Port [%d] to the list allowed by CONNECT",
port);
vector_append (ports_allowed_by_connect, (void **) &port, sizeof (port));
}
/*
* This routine checks to see if a port is allowed in the CONNECT method.
*
* Returns: 1 if allowed
* 0 if denied
*/
static int
check_allowed_connect_ports (int port)
{
size_t i;
int *data;
/*
* A port list is REQUIRED for a CONNECT request to function
* properly. This closes a potential security hole.
*/
if (!ports_allowed_by_connect)
return 0;
for (i = 0; i != (size_t)vector_length (ports_allowed_by_connect); ++i)
{
data = (int *)vector_getentry (ports_allowed_by_connect, i, NULL);
if (data && *data == port)
return 1;
}
return 0;
}
/*
* Read in the first line from the client (the request line for HTTP
* connections. The request line is allocated from the heap, but it must
* be freed in another function.
*/
static int
read_request_line (struct conn_s *connptr)
{
ssize_t len;
retry:
len = readline (connptr->client_fd, &connptr->request_line);
if (len <= 0)
{
log_message (LOG_ERR,
"read_request_line: Client (file descriptor: %d) "
"closed socket before read.", connptr->client_fd);
return -1;
}
/*
* Strip the new line and carriage return from the string.
*/
if (chomp (connptr->request_line, len) == len)
{
/*
* If the number of characters removed is the same as the
* length then it was a blank line. Free the buffer and
* try again (since we're looking for a request line.)
*/
safefree (connptr->request_line);
goto retry;
}
log_message (LOG_CONN, "Request (file descriptor %d): %s",
connptr->client_fd, connptr->request_line);
return 0;
}
/*
* Free all the memory allocated in a request.
*/
static void
free_request_struct (struct request_s *request)
{
if (!request)
return;
safefree (request->method);
safefree (request->protocol);
if (request->host)
safefree (request->host);
if (request->path)
safefree (request->path);
safefree (request);
}
/*
* Take a host string and if there is a username/password part, strip
* it off.
*/
static void
strip_username_password (char *host)
{
char *p;
assert (host);
assert (strlen (host) > 0);
if ((p = strchr (host, '@')) == NULL)
return;
/*
* Move the pointer past the "@" and then copy from that point
* until the NUL to the beginning of the host buffer.
*/
p++;
while (*p)
*host++ = *p++;
*host = '\0';
}
/*
* Take a host string and if there is a port part, strip
* it off and set proper port variable i.e. for www.host.com:8001
*/
static int
strip_return_port (char *host)
{
char *ptr1;
int port;
ptr1 = strchr (host, ':');
if (ptr1 == NULL)
return 0;
*ptr1++ = '\0';
if (sscanf (ptr1, "%d", &port) != 1) /* one conversion required */
return 0;
return port;
}
/*
* Pull the information out of the URL line. This will handle both HTTP
* and FTP (proxied) URLs.
*/
static int
extract_http_url (const char *url, struct request_s *request)
{
char *p;
int len;
int port;
/* Split the URL on the slash to separate host from path */
p = strchr (url, '/');
if (p != NULL)
{
len = p - url;
request->host = (char *)safemalloc (len + 1);
memcpy (request->host, url, len);
request->host[len] = '\0';
request->path = safestrdup (p);
}
else
{
request->host = safestrdup (url);
request->path = safestrdup ("/");
}
if (!request->host || !request->path)
goto ERROR_EXIT;
/* Remove the username/password if they're present */
strip_username_password (request->host);
/* Find a proper port in www.site.com:8001 URLs */
port = strip_return_port (request->host);
request->port = (port != 0) ? port : HTTP_PORT;
return 0;
ERROR_EXIT:
if (request->host)
safefree (request->host);
if (request->path)
safefree (request->path);
return -1;
}
/*
* Extract the URL from a SSL connection.
*/
static int
extract_ssl_url (const char *url, struct request_s *request)
{
request->host = (char *)safemalloc (strlen (url) + 1);
if (!request->host)
return -1;
if (sscanf (url, "%[^:]:%hu", request->host, &request->port) == 2);
else if (sscanf (url, "%s", request->host) == 1)
request->port = HTTP_PORT_SSL;
else
{
log_message (LOG_ERR, "extract_ssl_url: Can't parse URL.");
safefree (request->host);
return -1;
}
/* Remove the username/password if they're present */
strip_username_password (request->host);
return 0;
}
#ifdef UPSTREAM_SUPPORT
/*
* Add an entry to the upstream list
*/
void
upstream_add (const char *host, int port, const char *domain)
{
char *ptr;
struct upstream *up = safemalloc (sizeof (struct upstream));
if (!up)
{
log_message (LOG_ERR, "Unable to allocate memory in upstream_add()");
return;
}
up->host = up->domain = NULL;
up->ip = up->mask = 0;
if (domain == NULL)
{
if (!host || host[0] == '\0' || port < 1)
{
log_message (LOG_WARNING,
"Nonsense upstream rule: invalid host or port");
goto upstream_cleanup;
}
up->host = safestrdup (host);
up->port = port;
log_message (LOG_INFO, "Added upstream %s:%d for [default]",
host, port);
}
else if (host == NULL)
{
if (!domain || domain[0] == '\0')
{
log_message (LOG_WARNING,
"Nonsense no-upstream rule: empty domain");
goto upstream_cleanup;
}
ptr = strchr (domain, '/');
if (ptr)
{
struct in_addr addrstruct;
*ptr = '\0';
if (inet_aton (domain, &addrstruct) != 0)
{
up->ip = ntohl (addrstruct.s_addr);
*ptr++ = '/';
if (strchr (ptr, '.'))
{
if (inet_aton (ptr, &addrstruct) != 0)
up->mask = ntohl (addrstruct.s_addr);
}
else
{
up->mask = ~((1 << (32 - atoi (ptr))) - 1);
}
}
}
else
{
up->domain = safestrdup (domain);
}
log_message (LOG_INFO, "Added no-upstream for %s", domain);
}
else
{
if (!host || host[0] == '\0' || port < 1 || !domain || domain == '\0')
{
log_message (LOG_WARNING,
"Nonsense upstream rule: invalid parameters");
goto upstream_cleanup;
}
up->host = safestrdup (host);
up->port = port;
up->domain = safestrdup (domain);
log_message (LOG_INFO, "Added upstream %s:%d for %s",
host, port, domain);
}
if (!up->domain && !up->ip)
{ /* always add default to end */
struct upstream *tmp = config.upstream_list;
while (tmp)
{
if (!tmp->domain && !tmp->ip)
{
log_message (LOG_WARNING, "Duplicate default upstream");
goto upstream_cleanup;
}
if (!tmp->next)
{
up->next = NULL;
tmp->next = up;
return;
}
tmp = tmp->next;
}
}
up->next = config.upstream_list;
config.upstream_list = up;
return;
upstream_cleanup:
safefree (up->host);
safefree (up->domain);
safefree (up);
return;
}
/*
* Check if a host is in the upstream list
*/
static struct upstream *
upstream_get (char *host)
{
struct upstream *up = config.upstream_list;
in_addr_t my_ip = INADDR_NONE;
while (up)
{
if (up->domain)
{
if (strcasecmp (host, up->domain) == 0)
break; /* exact match */
if (up->domain[0] == '.')
{
char *dot = strchr (host, '.');
if (!dot && !up->domain[1])
break; /* local host matches "." */
while (dot && strcasecmp (dot, up->domain))
dot = strchr (dot + 1, '.');
if (dot)
break; /* subdomain match */
}
}
else if (up->ip)
{
if (my_ip == INADDR_NONE)
my_ip = ntohl (inet_addr (host));
if ((my_ip & up->mask) == up->ip)
break;
}
else
{
break; /* No domain or IP, default upstream */
}
up = up->next;
}
if (up && (!up->host || !up->port))
up = NULL;
if (up)
log_message (LOG_INFO, "Found proxy %s:%d for %s",
up->host, up->port, host);
else
log_message (LOG_INFO, "No proxy for %s", host);
return up;
}
#endif
/*
* Create a connection for HTTP connections.
*/
static int
establish_http_connection (struct conn_s *connptr, struct request_s *request)
{
char portbuff[7];
/* Build a port string if it's not a standard port */
if (request->port != HTTP_PORT && request->port != HTTP_PORT_SSL)
snprintf (portbuff, 7, ":%u", request->port);
else
portbuff[0] = '\0';
return write_message (connptr->server_fd,
"%s %s HTTP/1.0\r\n"
"Host: %s%s\r\n"
"Connection: close\r\n",
request->method, request->path,
request->host, portbuff);
}
/*
* These two defines are for the SSL tunnelling.
*/
#define SSL_CONNECTION_RESPONSE "HTTP/1.0 200 Connection established"
#define PROXY_AGENT "Proxy-agent: " PACKAGE "/" VERSION
/*
* Send the appropriate response to the client to establish a SSL
* connection.
*/
static inline int
send_ssl_response (struct conn_s *connptr)
{
return write_message (connptr->client_fd,
"%s\r\n"
"%s\r\n"
"\r\n", SSL_CONNECTION_RESPONSE, PROXY_AGENT);
}
/*
* Break the request line apart and figure out where to connect and
* build a new request line. Finally connect to the remote server.
*/
static struct request_s *
process_request (struct conn_s *connptr, hashmap_t hashofheaders)
{
char *url;
struct request_s *request;
int ret;
size_t request_len;
/* NULL out all the fields so frees don't cause segfaults. */
request = safecalloc (1, sizeof (struct request_s));
if (!request)
return NULL;
request_len = strlen (connptr->request_line) + 1;
request->method = safemalloc (request_len);
url = safemalloc (request_len);
request->protocol = safemalloc (request_len);
if (!request->method || !url || !request->protocol)
{
safefree (url);
free_request_struct (request);
return NULL;
}
ret = sscanf (connptr->request_line, "%[^ ] %[^ ] %[^ ]",
request->method, url, request->protocol);
if (ret == 2 && !strcasecmp (request->method, "GET"))
{
request->protocol[0] = 0;
/* Indicate that this is a HTTP/0.9 GET request */
connptr->protocol.major = 0;
connptr->protocol.minor = 9;
}
else if (ret == 3 && !strncasecmp (request->protocol, "HTTP/", 5))
{
/*
* Break apart the protocol and update the connection
* structure.
*/
ret = sscanf (request->protocol + 5, "%u.%u",
&connptr->protocol.major, &connptr->protocol.minor);
/*
* If the conversion doesn't succeed, drop down below and
* send the error to the user.
*/
if (ret != 2)
goto BAD_REQUEST_ERROR;
}
else
{
BAD_REQUEST_ERROR:
log_message (LOG_ERR,
"process_request: Bad Request on file descriptor %d",
connptr->client_fd);
indicate_http_error (connptr, 400, "Bad Request",
"detail", "Request has an invalid format",
"url", url, NULL);
safefree (url);
free_request_struct (request);
return NULL;
}
if (!url)
{
log_message (LOG_ERR,
"process_request: Null URL on file descriptor %d",
connptr->client_fd);
indicate_http_error (connptr, 400, "Bad Request",
"detail", "Request has an empty URL",
"url", url, NULL);
safefree (url);
free_request_struct (request);
return NULL;
}
#ifdef REVERSE_SUPPORT
if (config.reversepath_list != NULL)
{
/*
* Rewrite the URL based on the reverse path. After calling
* reverse_rewrite_url "url" can be freed since we either
* have the newly rewritten URL, or something failed and
* we'll be closing anyway.
*/
char *reverse_url;
reverse_url = reverse_rewrite_url (connptr, hashofheaders, url);
safefree (url);
if (!reverse_url)
{
free_request_struct (request);
return NULL;
}
else
{
url = reverse_url;
}
}
#endif
if (strncasecmp (url, "http://", 7) == 0
|| (UPSTREAM_CONFIGURED () && strncasecmp (url, "ftp://", 6) == 0))
{
char *skipped_type = strstr (url, "//") + 2;
if (extract_http_url (skipped_type, request) < 0)
{
indicate_http_error (connptr, 400, "Bad Request",
"detail", "Could not parse URL",
"url", url, NULL);
safefree (url);
free_request_struct (request);
return NULL;
}
}
else if (strcmp (request->method, "CONNECT") == 0)
{
if (extract_ssl_url (url, request) < 0)
{
indicate_http_error (connptr, 400, "Bad Request",
"detail", "Could not parse URL",
"url", url, NULL);
safefree (url);
free_request_struct (request);
return NULL;
}
/* Verify that the port in the CONNECT method is allowed */
if (!check_allowed_connect_ports (request->port))
{
indicate_http_error (connptr, 403, "Access violation",
"detail",
"The CONNECT method not allowed "
"with the port you tried to use.",
"url", url, NULL);
log_message (LOG_INFO,
"Refused CONNECT method on port %d", request->port);
safefree (url);
free_request_struct (request);
return NULL;
}
connptr->connect_method = TRUE;
}
else
{
#ifdef TRANSPARENT_PROXY
if (!do_transparent_proxy
(connptr, hashofheaders, request, &config, url))
{
safefree (url);
free_request_struct (request);
return NULL;
}
#else
indicate_http_error (connptr, 501, "Not Implemented",
"detail",
"Unknown method or unsupported protocol.", "url",
url, NULL);
log_message (LOG_INFO, "Unknown method (%s) or protocol (%s)",
request->method, url);
safefree (url);
free_request_struct (request);
return NULL;
#endif
}
#ifdef FILTER_ENABLE
/*
* Filter restricted domains/urls
*/
if (config.filter)
{
if (config.filter_url)
ret = filter_url (url);
else
ret = filter_domain (request->host);
if (ret)
{
update_stats (STAT_DENIED);
if (config.filter_url)
log_message (LOG_NOTICE,
"Proxying refused on filtered url \"%s\"", url);
else
log_message (LOG_NOTICE,
"Proxying refused on filtered domain \"%s\"",
request->host);
indicate_http_error (connptr, 403, "Filtered",
"detail",
"The request you made has been filtered",
"url", url, NULL);
safefree (url);
free_request_struct (request);
return NULL;
}
}
#endif
safefree (url);
/*
* Check to see if they're requesting the stat host
*/
if (config.stathost && strcmp (config.stathost, request->host) == 0)
{
log_message (LOG_NOTICE, "Request for the stathost.");
connptr->show_stats = TRUE;
free_request_struct (request);
return NULL;
}
return request;
}
/*
* pull_client_data is used to pull across any client data (like in a
* POST) which needs to be handled before an error can be reported, or
* server headers can be processed.
* - rjkaes
*/
static int
pull_client_data (struct conn_s *connptr, long int length)
{
char *buffer;
ssize_t len;
buffer = safemalloc (min (MAXBUFFSIZE, length));
if (!buffer)
return -1;
do
{
len = safe_read (connptr->client_fd, buffer, min (MAXBUFFSIZE, length));
if (len <= 0)
goto ERROR_EXIT;
if (!connptr->error_variables)
{
if (safe_write (connptr->server_fd, buffer, len) < 0)
goto ERROR_EXIT;
}
length -= len;
}
while (length > 0);
/*
* BUG FIX: Internet Explorer will leave two bytes (carriage
* return and line feed) at the end of a POST message. These
* need to be eaten for tinyproxy to work correctly.
*/
socket_nonblocking (connptr->client_fd);
len = recv (connptr->client_fd, buffer, 2, MSG_PEEK);
socket_blocking (connptr->client_fd);
if (len < 0 && errno != EAGAIN)
goto ERROR_EXIT;
if (len == 2 && CHECK_CRLF (buffer, len))
read (connptr->client_fd, buffer, 2);
safefree (buffer);
return 0;
ERROR_EXIT:
safefree (buffer);
return -1;
}
#ifdef XTINYPROXY_ENABLE
/*
* Add the X-Tinyproxy header to the collection of headers being sent to
* the server.
* -rjkaes
*/
static inline int
add_xtinyproxy_header (struct conn_s *connptr)
{
assert (connptr && connptr->server_fd >= 0);
return write_message (connptr->server_fd,
"X-Tinyproxy: %s\r\n", connptr->client_ip_addr);
}
#endif /* XTINYPROXY */
/*
* Take a complete header line and break it apart (into a key and the data.)
* Now insert this information into the hashmap for the connection so it
* can be retrieved and manipulated later.
*/
static inline int
add_header_to_connection (hashmap_t hashofheaders, char *header, size_t len)
{
char *sep;
/* Get rid of the new line and return at the end */
len -= chomp (header, len);
sep = strchr (header, ':');
if (!sep)
return -1;
/* Blank out colons, spaces, and tabs. */
while (*sep == ':' || *sep == ' ' || *sep == '\t')
*sep++ = '\0';
/* Calculate the new length of just the data */
len -= sep - header - 1;
return hashmap_insert (hashofheaders, header, sep, len);
}
/*
* Read all the headers from the stream
*/
static int
get_all_headers (int fd, hashmap_t hashofheaders)
{
char *line = NULL;
char *header = NULL;
char *tmp;
ssize_t linelen;
ssize_t len = 0;
unsigned int double_cgi = FALSE; /* boolean */
assert (fd >= 0);
assert (hashofheaders != NULL);
for (;;)
{
if ((linelen = readline (fd, &line)) <= 0)
{
safefree (header);
safefree (line);
return -1;
}
/*
* If we received a CR LF or a non-continuation line, then add
* the accumulated header field, if any, to the hashmap, and
* reset it.
*/
if (CHECK_CRLF (line, linelen) || !CHECK_LWS (line, linelen))
{
if (!double_cgi
&& len > 0
&& add_header_to_connection (hashofheaders, header, len) < 0)
{
safefree (header);
safefree (line);
return -1;
}
len = 0;
}
/*
* If we received just a CR LF on a line, the headers are
* finished.
*/
if (CHECK_CRLF (line, linelen))
{
safefree (header);
safefree (line);
return 0;
}
/*
* BUG FIX: The following code detects a "Double CGI"
* situation so that we can handle the nonconforming system.
* This problem was found when accessing cgi.ebay.com, and it
* turns out to be a wider spread problem as well.
*
* If "Double CGI" is in effect, duplicate headers are
* ignored.
*
* FIXME: Might need to change this to a more robust check.
*/
if (linelen >= 5 && strncasecmp (line, "HTTP/", 5) == 0)
{
double_cgi = TRUE;
}
/*
* Append the new line to the current header field.
*/
if ((tmp = saferealloc (header, len + linelen)) == NULL)
{
safefree (header);
safefree (line);
return -1;
}
header = tmp;
memcpy (header + len, line, linelen);
len += linelen;
safefree (line);
}
}
/*
* Extract the headers to remove. These headers were listed in the Connection
* and Proxy-Connection headers.
*/
static int
remove_connection_headers (hashmap_t hashofheaders)
{
static char *headers[] = {
"connection",
"proxy-connection"
};
char *data;
char *ptr;
ssize_t len;
int i;
for (i = 0; i != (sizeof (headers) / sizeof (char *)); ++i)
{
/* Look for the connection header. If it's not found, return. */
len = hashmap_entry_by_key (hashofheaders, headers[i], (void **) &data);
if (len <= 0)
return 0;
/*
* Go through the data line and replace any special characters
* with a NULL.
*/
ptr = data;
while ((ptr = strpbrk (ptr, "()<>@,;:\\\"/[]?={} \t")))
*ptr++ = '\0';
/*
* All the tokens are separated by NULLs. Now go through the
* token and remove them from the hashofheaders.
*/
ptr = data;
while (ptr < data + len)
{
hashmap_remove (hashofheaders, ptr);
/* Advance ptr to the next token */
ptr += strlen (ptr) + 1;
while (ptr < data + len && *ptr == '\0')
ptr++;
}
/* Now remove the connection header it self. */
hashmap_remove (hashofheaders, headers[i]);
}
return 0;
}
/*
* If there is a Content-Length header, then return the value; otherwise, return
* a negative number.
*/
static long
get_content_length (hashmap_t hashofheaders)
{
ssize_t len;
char *data;
long content_length = -1;
len =
hashmap_entry_by_key (hashofheaders, "content-length", (void **) &data);
if (len > 0)
content_length = atol (data);
return content_length;
}
/*
* Search for Via header in a hash of headers and either write a new Via
* header, or append our information to the end of an existing Via header.
*
* FIXME: Need to add code to "hide" our internal information for security
* purposes.
*/
static int
write_via_header (int fd, hashmap_t hashofheaders,
unsigned int major, unsigned int minor)
{
ssize_t len;
char hostname[512];
char *data;
int ret;
if (config.via_proxy_name)
{
strlcpy (hostname, config.via_proxy_name, sizeof (hostname));
}
else if (gethostname (hostname, sizeof (hostname)) < 0)
{
strcpy (hostname, "unknown");
}
/*
* See if there is a "Via" header. If so, again we need to do a bit
* of processing.
*/
len = hashmap_entry_by_key (hashofheaders, "via", (void **) &data);
if (len > 0)
{
ret = write_message (fd,
"Via: %s, %hu.%hu %s (%s/%s)\r\n",
data, major, minor, hostname, PACKAGE, VERSION);
hashmap_remove (hashofheaders, "via");
}
else
{
ret = write_message (fd,
"Via: %hu.%hu %s (%s/%s)\r\n",
major, minor, hostname, PACKAGE, VERSION);
}
return ret;
}
/*
* Number of buckets to use internally in the hashmap.
*/
#define HEADER_BUCKETS 32
/*
* Here we loop through all the headers the client is sending. If we
* are running in anonymous mode, we will _only_ send the headers listed
* (plus a few which are required for various methods).
* - rjkaes
*/
static int
process_client_headers (struct conn_s *connptr, hashmap_t hashofheaders)
{
static char *skipheaders[] = {
"host",
"keep-alive",
"proxy-connection",
"te",
"trailers",
"transfer-encoding",
"upgrade"
};
int i;
hashmap_iter iter;
int ret = 0;
char *data, *header;
/*
* Don't send headers if there's already an error, if the request was
* a stats request, or if this was a CONNECT method (unless upstream
* proxy is in use.)
*/
if (connptr->server_fd == -1 || connptr->show_stats
|| (connptr->connect_method && (connptr->upstream_proxy == NULL)))
{
log_message (LOG_INFO, "Not sending client headers to remote machine");
return 0;
}
/*
* See if there is a "Content-Length" header. If so, again we need
* to do a bit of processing.
*/
connptr->content_length.client = get_content_length (hashofheaders);
/*
* See if there is a "Connection" header. If so, we need to do a bit
* of processing. :)
*/
remove_connection_headers (hashofheaders);
/*
* Delete the headers listed in the skipheaders list
*/
for (i = 0; i != (sizeof (skipheaders) / sizeof (char *)); i++)
{
hashmap_remove (hashofheaders, skipheaders[i]);
}
/* Send, or add the Via header */
ret = write_via_header (connptr->server_fd, hashofheaders,
connptr->protocol.major, connptr->protocol.minor);
if (ret < 0)
{
indicate_http_error (connptr, 503,
"Could not send data to remote server",
"detail",
"A network error occurred while "
"trying to write data to the remote web server.",
NULL);
goto PULL_CLIENT_DATA;
}
/*
* Output all the remaining headers to the remote machine.
*/
iter = hashmap_first (hashofheaders);
if (iter >= 0)
{
for (; !hashmap_is_end (hashofheaders, iter); ++iter)
{
hashmap_return_entry (hashofheaders,
iter, &data, (void **) &header);
if (!is_anonymous_enabled () || anonymous_search (data) > 0)
{
ret =
write_message (connptr->server_fd,
"%s: %s\r\n", data, header);
if (ret < 0)
{
indicate_http_error (connptr, 503,
"Could not send data to remote server",
"detail",
"A network error occurred while "
"trying to write data to the "
"remote web server.", NULL);
goto PULL_CLIENT_DATA;
}
}
}
}
#if defined(XTINYPROXY_ENABLE)
if (config.my_domain)
add_xtinyproxy_header (connptr);
#endif
/* Write the final "blank" line to signify the end of the headers */
if (safe_write (connptr->server_fd, "\r\n", 2) < 0)
return -1;
/*
* Spin here pulling the data from the client.
*/
PULL_CLIENT_DATA:
if (connptr->content_length.client > 0)
return pull_client_data (connptr, connptr->content_length.client);
else
return ret;
}
/*
* Loop through all the headers (including the response code) from the
* server.
*/
static int
process_server_headers (struct conn_s *connptr)
{
static char *skipheaders[] = {
"keep-alive",
"proxy-authenticate",
"proxy-authorization",
"proxy-connection",
"transfer-encoding",
};
char *response_line;
hashmap_t hashofheaders;
hashmap_iter iter;
char *data, *header;
ssize_t len;
int i;
int ret;
#ifdef REVERSE_SUPPORT
struct reversepath *reverse = config.reversepath_list;
#endif
/* Get the response line from the remote server. */
retry:
len = readline (connptr->server_fd, &response_line);
if (len <= 0)
return -1;
/*
* Strip the new line and character return from the string.
*/
if (chomp (response_line, len) == len)
{
/*
* If the number of characters removed is the same as the
* length then it was a blank line. Free the buffer and
* try again (since we're looking for a request line.)
*/
safefree (response_line);
goto retry;
}
hashofheaders = hashmap_create (HEADER_BUCKETS);
if (!hashofheaders)
{
safefree (response_line);
return -1;
}
/*
* Get all the headers from the remote server in a big hash
*/
if (get_all_headers (connptr->server_fd, hashofheaders) < 0)
{
log_message (LOG_WARNING,
"Could not retrieve all the headers from the remote server.");
hashmap_delete (hashofheaders);
safefree (response_line);
indicate_http_error (connptr, 503,
"Could not retrieve all the headers",
"detail",
PACKAGE " "
"was unable to retrieve and process headers from "
"the remote web server.", NULL);
return -1;
}
/*
* At this point we've received the response line and all the
* headers. However, if this is a simple HTTP/0.9 request we
* CAN NOT send any of that information back to the client.
* Instead we'll free all the memory and return.
*/
if (connptr->protocol.major < 1)
{
hashmap_delete (hashofheaders);
safefree (response_line);
return 0;
}
/* Send the saved response line first */
ret = write_message (connptr->client_fd, "%s\r\n", response_line);
safefree (response_line);
if (ret < 0)
goto ERROR_EXIT;
/*
* If there is a "Content-Length" header, retrieve the information
* from it for later use.
*/
connptr->content_length.server = get_content_length (hashofheaders);
/*
* See if there is a connection header. If so, we need to to a bit of
* processing.
*/
remove_connection_headers (hashofheaders);
/*
* Delete the headers listed in the skipheaders list
*/
for (i = 0; i != (sizeof (skipheaders) / sizeof (char *)); i++)
{
hashmap_remove (hashofheaders, skipheaders[i]);
}
/* Send, or add the Via header */
ret = write_via_header (connptr->client_fd, hashofheaders,
connptr->protocol.major, connptr->protocol.minor);
if (ret < 0)
goto ERROR_EXIT;
#ifdef REVERSE_SUPPORT
/* Write tracking cookie for the magical reverse proxy path hack */
if (config.reversemagic && connptr->reversepath)
{
ret = write_message (connptr->client_fd,
"Set-Cookie: " REVERSE_COOKIE
"=%s; path=/\r\n", connptr->reversepath);
if (ret < 0)
goto ERROR_EXIT;
}
/* Rewrite the HTTP redirect if needed */
if (config.reversebaseurl &&
hashmap_entry_by_key (hashofheaders, "location", (void **) &header) > 0)
{
/* Look for a matching entry in the reversepath list */
while (reverse)
{
if (strncasecmp (header,
reverse->url, (len = strlen (reverse->url))) == 0)
break;
reverse = reverse->next;
}
if (reverse)
{
ret =
write_message (connptr->client_fd,
"Location: %s%s%s\r\n",
config.reversebaseurl,
(reverse->path + 1), (header + len));
if (ret < 0)
goto ERROR_EXIT;
log_message (LOG_INFO,
"Rewriting HTTP redirect: %s -> %s%s%s",
header, config.reversebaseurl,
(reverse->path + 1), (header + len));
hashmap_remove (hashofheaders, "location");
}
}
#endif
/*
* All right, output all the remaining headers to the client.
*/
iter = hashmap_first (hashofheaders);
if (iter >= 0)
{
for (; !hashmap_is_end (hashofheaders, iter); ++iter)
{
hashmap_return_entry (hashofheaders,
iter, &data, (void **) &header);
ret = write_message (connptr->client_fd,
"%s: %s\r\n", data, header);
if (ret < 0)
goto ERROR_EXIT;
}
}
hashmap_delete (hashofheaders);
/* Write the final blank line to signify the end of the headers */
if (safe_write (connptr->client_fd, "\r\n", 2) < 0)
return -1;
return 0;
ERROR_EXIT:
hashmap_delete (hashofheaders);
return -1;
}
/*
* Switch the sockets into nonblocking mode and begin relaying the bytes
* between the two connections. We continue to use the buffering code
* since we want to be able to buffer a certain amount for slower
* connections (as this was the reason why I originally modified
* tinyproxy oh so long ago...)
* - rjkaes
*/
static void
relay_connection (struct conn_s *connptr)
{
fd_set rset, wset;
struct timeval tv;
time_t last_access;
int ret;
double tdiff;
int maxfd = max (connptr->client_fd, connptr->server_fd) + 1;
ssize_t bytes_received;
socket_nonblocking (connptr->client_fd);
socket_nonblocking (connptr->server_fd);
last_access = time (NULL);
for (;;)
{
FD_ZERO (&rset);
FD_ZERO (&wset);
tv.tv_sec = config.idletimeout - difftime (time (NULL), last_access);
tv.tv_usec = 0;
if (buffer_size (connptr->sbuffer) > 0)
FD_SET (connptr->client_fd, &wset);
if (buffer_size (connptr->cbuffer) > 0)
FD_SET (connptr->server_fd, &wset);
if (buffer_size (connptr->sbuffer) < MAXBUFFSIZE)
FD_SET (connptr->server_fd, &rset);
if (buffer_size (connptr->cbuffer) < MAXBUFFSIZE)
FD_SET (connptr->client_fd, &rset);
ret = select (maxfd, &rset, &wset, NULL, &tv);
if (ret == 0)
{
tdiff = difftime (time (NULL), last_access);
if (tdiff > config.idletimeout)
{
log_message (LOG_INFO,
"Idle Timeout (after select) as %g > %u.",
tdiff, config.idletimeout);
return;
}
else
{
continue;
}
}
else if (ret < 0)
{
log_message (LOG_ERR,
"relay_connection: select() error \"%s\". "
"Closing connection (client_fd:%d, server_fd:%d)",
strerror (errno), connptr->client_fd,
connptr->server_fd);
return;
}
else
{
/*
* All right, something was actually selected so mark it.
*/
last_access = time (NULL);
}
if (FD_ISSET (connptr->server_fd, &rset))
{
bytes_received = read_buffer (connptr->server_fd, connptr->sbuffer);
if (bytes_received < 0)
break;
connptr->content_length.server -= bytes_received;
if (connptr->content_length.server == 0)
break;
}
if (FD_ISSET (connptr->client_fd, &rset)
&& read_buffer (connptr->client_fd, connptr->cbuffer) < 0)
{
break;
}
if (FD_ISSET (connptr->server_fd, &wset)
&& write_buffer (connptr->server_fd, connptr->cbuffer) < 0)
{
break;
}
if (FD_ISSET (connptr->client_fd, &wset)
&& write_buffer (connptr->client_fd, connptr->sbuffer) < 0)
{
break;
}
}
/*
* Here the server has closed the connection... write the
* remainder to the client and then exit.
*/
socket_blocking (connptr->client_fd);
while (buffer_size (connptr->sbuffer) > 0)
{
if (write_buffer (connptr->client_fd, connptr->sbuffer) < 0)
break;
}
shutdown (connptr->client_fd, SHUT_WR);
/*
* Try to send any remaining data to the server if we can.
*/
socket_blocking (connptr->server_fd);
while (buffer_size (connptr->cbuffer) > 0)
{
if (write_buffer (connptr->server_fd, connptr->cbuffer) < 0)
break;
}
return;
}
/*
* Establish a connection to the upstream proxy server.
*/
static int
connect_to_upstream (struct conn_s *connptr, struct request_s *request)
{
#ifndef UPSTREAM_SUPPORT
/*
* This function does nothing if upstream support was not compiled
* into tinyproxy.
*/
return -1;
#else
char *combined_string;
int len;
struct upstream *cur_upstream = connptr->upstream_proxy;
if (!cur_upstream)
{
log_message (LOG_WARNING,
"No upstream proxy defined for %s.", request->host);
indicate_http_error (connptr, 404,
"Unable to connect to upstream proxy.");
return -1;
}
connptr->server_fd =
opensock (cur_upstream->host, cur_upstream->port,
connptr->server_ip_addr);
if (connptr->server_fd < 0)
{
log_message (LOG_WARNING, "Could not connect to upstream proxy.");
indicate_http_error (connptr, 404,
"Unable to connect to upstream proxy",
"detail",
"A network error occurred while trying to "
"connect to the upstream web proxy.", NULL);
return -1;
}
log_message (LOG_CONN,
"Established connection to upstream proxy \"%s\" "
"using file descriptor %d.",
cur_upstream->host, connptr->server_fd);
/*
* We need to re-write the "path" part of the request so that we
* can reuse the establish_http_connection() function. It expects a
* method and path.
*/
if (connptr->connect_method)
{
len = strlen (request->host) + 7;
combined_string = safemalloc (len);
if (!combined_string)
{
return -1;
}
snprintf (combined_string, len, "%s:%d", request->host, request->port);
}
else
{
len = strlen (request->host) + strlen (request->path) + 14;
combined_string = safemalloc (len);
if (!combined_string)
{
return -1;
}
snprintf (combined_string, len, "http://%s:%d%s", request->host,
request->port, request->path);
}
if (request->path)
safefree (request->path);
request->path = combined_string;
return establish_http_connection (connptr, request);
#endif
}
/*
* This is the main drive for each connection. As you can tell, for the
* first few steps we are using a blocking socket. If you remember the
* older tinyproxy code, this use to be a very confusing state machine.
* Well, no more! :) The sockets are only switched into nonblocking mode
* when we start the relay portion. This makes most of the original
* tinyproxy code, which was confusing, redundant. Hail progress.
* - rjkaes
*/
void
handle_connection (int fd)
{
struct conn_s *connptr;
struct request_s *request = NULL;
hashmap_t hashofheaders = NULL;
char sock_ipaddr[IP_LENGTH];
char peer_ipaddr[IP_LENGTH];
char peer_string[HOSTNAME_LENGTH];
getpeer_information (fd, peer_ipaddr, peer_string);
if (config.bindsame)
getsock_ip (fd, sock_ipaddr);
log_message (LOG_CONN, config.bindsame ?
"Connect (file descriptor %d): %s [%s] at [%s]" :
"Connect (file descriptor %d): %s [%s]",
fd, peer_string, peer_ipaddr, sock_ipaddr);
connptr = initialize_conn (fd, peer_ipaddr, peer_string,
config.bindsame ? sock_ipaddr : 0);
if (!connptr)
{
close (fd);
return;
}
if (check_acl (peer_ipaddr, peer_string) <= 0)
{
update_stats (STAT_DENIED);
indicate_http_error (connptr, 403, "Access denied",
"detail",
"The administrator of this proxy has not configured "
"it to service requests from your host.", NULL);
send_http_error_message (connptr);
destroy_conn (connptr);
return;
}
if (read_request_line (connptr) < 0)
{
update_stats (STAT_BADCONN);
indicate_http_error (connptr, 408, "Timeout",
"detail",
"Server timeout waiting for the HTTP request "
"from the client.", NULL);
send_http_error_message (connptr);
destroy_conn (connptr);
return;
}
/*
* The "hashofheaders" store the client's headers.
*/
if (!(hashofheaders = hashmap_create (HEADER_BUCKETS)))
{
update_stats (STAT_BADCONN);
indicate_http_error (connptr, 503, "Internal error",
"detail",
"An internal server error occurred while processing "
"your request. Please contact the administrator.",
NULL);
send_http_error_message (connptr);
destroy_conn (connptr);
return;
}
/*
* Get all the headers from the client in a big hash.
*/
if (get_all_headers (connptr->client_fd, hashofheaders) < 0)
{
log_message (LOG_WARNING,
"Could not retrieve all the headers from the client");
hashmap_delete (hashofheaders);
update_stats (STAT_BADCONN);
destroy_conn (connptr);
return;
}
request = process_request (connptr, hashofheaders);
if (!request)
{
if (!connptr->error_variables && !connptr->show_stats)
{
update_stats (STAT_BADCONN);
destroy_conn (connptr);
hashmap_delete (hashofheaders);
return;
}
goto send_error;
}
connptr->upstream_proxy = UPSTREAM_HOST (request->host);
if (connptr->upstream_proxy != NULL)
{
if (connect_to_upstream (connptr, request) < 0)
{
goto send_error;
}
}
else
{
connptr->server_fd = opensock (request->host, request->port,
connptr->server_ip_addr);
if (connptr->server_fd < 0)
{
indicate_http_error (connptr, 500, "Unable to connect",
"detail",
PACKAGE " "
"was unable to connect to the remote web server.",
"error", strerror (errno), NULL);
goto send_error;
}
log_message (LOG_CONN,
"Established connection to host \"%s\" using "
"file descriptor %d.", request->host, connptr->server_fd);
if (!connptr->connect_method)
establish_http_connection (connptr, request);
}
send_error:
free_request_struct (request);
if (process_client_headers (connptr, hashofheaders) < 0)
{
update_stats (STAT_BADCONN);
if (!connptr->error_variables)
{
hashmap_delete (hashofheaders);
destroy_conn (connptr);
return;
}
}
hashmap_delete (hashofheaders);
if (connptr->error_variables)
{
send_http_error_message (connptr);
destroy_conn (connptr);
return;
}
else if (connptr->show_stats)
{
showstats (connptr);
destroy_conn (connptr);
return;
}
if (!connptr->connect_method || (connptr->upstream_proxy != NULL))
{
if (process_server_headers (connptr) < 0)
{
if (connptr->error_variables)
send_http_error_message (connptr);
update_stats (STAT_BADCONN);
destroy_conn (connptr);
return;
}
}
else
{
if (send_ssl_response (connptr) < 0)
{
log_message (LOG_ERR,
"handle_connection: Could not send SSL greeting "
"to client.");
update_stats (STAT_BADCONN);
destroy_conn (connptr);
return;
}
}
relay_connection (connptr);
log_message (LOG_INFO,
"Closed connection between local client (fd:%d) "
"and remote client (fd:%d)",
connptr->client_fd, connptr->server_fd);
/*
* All done... close everything and go home... :)
*/
destroy_conn (connptr);
return;
}
|