1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.15 2001/07/29 17:40:43 jongfoster Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/jbsockets.c,v $
6 * Purpose : Contains wrappers for system-specific sockets code,
7 * so that the rest of JunkBuster can be more
8 * OS-independent. Contains #ifdefs to make this work
11 * Copyright : Written by and Copyright (C) 2001 the SourceForge
12 * IJBSWA team. http://ijbswa.sourceforge.net
14 * Based on the Internet Junkbuster originally written
15 * by and Copyright (C) 1997 Anonymous Coders and
16 * Junkbusters Corporation. http://www.junkbusters.com
18 * This program is free software; you can redistribute it
19 * and/or modify it under the terms of the GNU General
20 * Public License as published by the Free Software
21 * Foundation; either version 2 of the License, or (at
22 * your option) any later version.
24 * This program is distributed in the hope that it will
25 * be useful, but WITHOUT ANY WARRANTY; without even the
26 * implied warranty of MERCHANTABILITY or FITNESS FOR A
27 * PARTICULAR PURPOSE. See the GNU General Public
28 * License for more details.
30 * The GNU General Public License should be included with
31 * this file. If not, you can view it at
32 * http://www.gnu.org/copyleft/gpl.html
33 * or write to the Free Software Foundation, Inc., 59
34 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
37 * $Log: jbsockets.c,v $
38 * Revision 1.15 2001/07/29 17:40:43 jongfoster
39 * Fixed compiler warning by adding a cast
41 * Revision 1.14 2001/07/18 13:47:59 oes
42 * Eliminated dirty hack for getsockbyname()
44 * Revision 1.13 2001/07/15 13:56:57 jongfoster
45 * Removing unused local variable.
47 * Revision 1.12 2001/07/01 17:04:11 oes
48 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
50 * Revision 1.11 2001/06/29 21:45:41 oes
51 * Indentation, CRLF->LF, Tab-> Space
53 * Revision 1.10 2001/06/29 13:29:15 oes
54 * - Added remote (server) host IP to csp->http->host_ip_addr_str
55 * - Added detection of local socket IP and fqdn
56 * - Removed logentry from cancelled commit
58 * Revision 1.9 2001/06/07 23:06:09 jongfoster
59 * The host parameter to connect_to() is now const.
61 * Revision 1.8 2001/06/03 19:12:07 oes
64 * Revision 1.7 2001/05/28 16:14:00 jongfoster
65 * Fixing bug in LOG_LEVEL_LOG
67 * Revision 1.6 2001/05/26 17:28:32 jongfoster
70 * Revision 1.5 2001/05/26 15:26:15 jongfoster
71 * ACL feature now provides more security by immediately dropping
72 * connections from untrusted hosts.
74 * Revision 1.4 2001/05/26 00:37:42 jongfoster
75 * Cosmetic indentation correction.
77 * Revision 1.3 2001/05/25 21:57:54 jongfoster
78 * Now gives a warning under Windows if you try to bind
79 * it to a port that's already in use.
81 * Revision 1.2 2001/05/17 23:01:01 oes
82 * - Cleaned CRLF's from the sources and related files
84 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
85 * Initial import of version 2.9.3 source tree
88 *********************************************************************/
98 #include <sys/types.h>
103 #include <sys/timeb.h>
109 #include <sys/time.h>
110 #include <netinet/in.h>
111 #include <sys/ioctl.h>
113 #include <sys/socket.h>
116 #include <netinet/tcp.h>
117 #include <arpa/inet.h>
125 #include "jbsockets.h"
129 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
132 /*********************************************************************
134 * Function : connect_to
136 * Description : Open a socket and connect to it. Will check
137 * that this is allowed according to ACL.
140 * 1 : host = hostname to connect to
141 * 2 : portnum = port to connent on
142 * 3 : csp = Current client state (buffers, headers, etc...)
143 * Not modified, only used for source IP and ACL.
145 * Returns : -1 => failure, else it is the socket file descriptor.
147 *********************************************************************/
148 int connect_to(const char *host, int portnum, struct client_state *csp)
150 struct sockaddr_in inaddr;
153 struct timeval tv[1];
154 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
156 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
159 struct access_control_addr dst[1];
160 #endif /* def FEATURE_ACL */
162 memset((char *)&inaddr, 0, sizeof inaddr);
164 if ((addr = resolve_hostname_to_ip(host)) == -1)
166 csp->http->host_ip_addr_str = strdup("unknown");
171 dst->addr = ntohl(addr);
174 if (block_acl(dst, csp))
179 #endif /* def FEATURE_ACL */
181 inaddr.sin_addr.s_addr = addr;
182 inaddr.sin_family = AF_INET;
183 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
185 if (sizeof(inaddr.sin_port) == sizeof(short))
187 inaddr.sin_port = htons((short)portnum);
191 inaddr.sin_port = htonl(portnum);
194 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
200 { /* turn off TCP coalescence */
202 setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
204 #endif /* def TCP_NODELAY */
206 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
207 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
210 fcntl(fd, F_SETFL, flags);
212 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
214 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == -1)
217 if (errno == WSAEINPROGRESS)
218 #else /* ifndef _WIN32 */
219 if (errno == EINPROGRESS)
220 #endif /* ndef _WIN32 */
232 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
236 fcntl(fd, F_SETFL, flags);
238 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
240 /* wait for connection to complete */
247 if (select(fd + 1, NULL, &wfds, NULL, tv) <= 0)
257 /*********************************************************************
259 * Function : write_socket
261 * Description : Write the contents of buf (for n bytes) to socket fd.
264 * 1 : fd = file descriptor (aka. handle) of socket to write to.
265 * 2 : buf = pointer to data to be written.
266 * 3 : len = length of data to be written to the socket "fd".
268 * Returns : Win32 & Unix: If no error occurs, returns the total number of
269 * bytes sent, which can be less than the number
270 * indicated by len. Otherwise, returns (-1).
272 *********************************************************************/
273 int write_socket(int fd, const char *buf, int len)
280 log_error(LOG_LEVEL_LOG, "%N", len, buf);
282 #if defined(_WIN32) || defined(__BEOS__) || defined(AMIGA)
283 return( send(fd, buf, len, 0));
285 return( write(fd, buf, len));
291 /*********************************************************************
293 * Function : read_socket
295 * Description : Read from a TCP/IP socket in a platform independent way.
298 * 1 : fd = file descriptor of the socket to read
299 * 2 : buf = pointer to buffer where data will be written
300 * Must be >= len bytes long.
301 * 3 : len = maximum number of bytes to read
303 * Returns : On success, the number of bytes read is returned (zero
304 * indicates end of file), and the file position is advanced
305 * by this number. It is not an error if this number is
306 * smaller than the number of bytes requested; this may hap-
307 * pen for example because fewer bytes are actually available
308 * right now (maybe because we were close to end-of-file, or
309 * because we are reading from a pipe, or from a terminal),
310 * or because read() was interrupted by a signal. On error,
311 * -1 is returned, and errno is set appropriately. In this
312 * case it is left unspecified whether the file position (if
315 *********************************************************************/
316 int read_socket(int fd, char *buf, int len)
323 #if defined(_WIN32) || defined(__BEOS__) || defined(AMIGA)
324 return( recv(fd, buf, len, 0));
326 return( read(fd, buf, len));
331 /*********************************************************************
333 * Function : close_socket
335 * Description : Closes a TCP/IP socket
338 * 1 : fd = file descriptor of socket to be closed
342 *********************************************************************/
343 void close_socket(int fd)
345 #if defined(_WIN32) || defined(__BEOS__)
356 /*********************************************************************
358 * Function : bind_port
360 * Description : Call socket, set socket options, and listen.
361 * Called by listen_loop to "boot up" our proxy address.
364 * 1 : hostnam = TCP/IP address to bind/listen to
365 * 2 : portnum = port to listen on
367 * Returns : if success, return file descriptor
368 * if failure, returns -2 if address is in use, otherwise -1
370 *********************************************************************/
371 int bind_port(const char *hostnam, int portnum)
373 struct sockaddr_in inaddr;
377 memset((char *)&inaddr, '\0', sizeof inaddr);
379 inaddr.sin_family = AF_INET;
380 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
382 if (sizeof(inaddr.sin_port) == sizeof(short))
384 inaddr.sin_port = htons((short)portnum);
388 inaddr.sin_port = htonl(portnum);
391 fd = socket(AF_INET, SOCK_STREAM, 0);
400 * FIXME: This is not needed for Win32 - in fact, it stops
401 * duplicate instances of JunkBuster from being caught.
402 * Is this really needed under UNIX, or should it be taked out?
405 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
406 #endif /* ndef _WIN32 */
408 if (bind (fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
412 if (errno == WSAEADDRINUSE)
414 if (errno == EADDRINUSE)
425 while (listen(fd, 5) == -1)
438 /*********************************************************************
440 * Function : accept_connection
442 * Description : Accepts a connection on a socket. Socket must have
443 * been created using bind_port().
446 * 1 : csp = Client state, cfd, ip_addr_str, and
447 * ip_addr_long will be set by this routine.
448 * 2 : fd = file descriptor returned from bind_port
450 * Returns : when a connection is accepted, it returns 1 (TRUE).
451 * On an error it returns 0 (FALSE).
453 *********************************************************************/
454 int accept_connection(struct client_state * csp, int fd)
456 struct sockaddr_in client, server;
457 struct hostent *host = NULL;
458 int afd, c_length, s_length;
460 c_length = s_length = sizeof(client);
464 afd = accept (fd, (struct sockaddr *) &client, &c_length);
465 } while (afd < 1 && errno == EINTR);
473 * Determine the IP-Adress that the client used to reach us
474 * and the hostname associated with that address
476 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
478 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
480 host = gethostbyaddr((const char *)&server.sin_addr,
481 sizeof(server.sin_addr), AF_INET);
484 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
488 csp->my_hostname = strdup(host->h_name);
493 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
494 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
501 /*********************************************************************
503 * Function : resolve_hostname_to_ip
505 * Description : Resolve a hostname to an internet tcp/ip address.
506 * NULL or an empty string resolve to INADDR_ANY.
509 * 1 : host = hostname to resolve
511 * Returns : -1 => failure, INADDR_ANY or tcp/ip address if succesful.
513 *********************************************************************/
514 int resolve_hostname_to_ip(const char *host)
516 struct sockaddr_in inaddr;
517 struct hostent *hostp;
519 if ((host == NULL) || (*host == '\0'))
524 memset((char *) &inaddr, 0, sizeof inaddr);
526 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
528 if ((hostp = gethostbyname(host)) == NULL)
533 if (hostp->h_addrtype != AF_INET)
536 errno = WSAEPROTOTYPE;
543 (char *) &inaddr.sin_addr,
544 (char *) hostp->h_addr,
545 sizeof(inaddr.sin_addr)
548 return(inaddr.sin_addr.s_addr);