1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.13 2001/07/15 13:56:57 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 1.13 2001/07/15 13:56:57 jongfoster
39 * Removing unused local variable.
41 * Revision 1.12 2001/07/01 17:04:11 oes
42 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
44 * Revision 1.11 2001/06/29 21:45:41 oes
45 * Indentation, CRLF->LF, Tab-> Space
47 * Revision 1.10 2001/06/29 13:29:15 oes
48 * - Added remote (server) host IP to csp->http->host_ip_addr_str
49 * - Added detection of local socket IP and fqdn
50 * - Removed logentry from cancelled commit
52 * Revision 1.9 2001/06/07 23:06:09 jongfoster
53 * The host parameter to connect_to() is now const.
55 * Revision 1.8 2001/06/03 19:12:07 oes
58 * Revision 1.7 2001/05/28 16:14:00 jongfoster
59 * Fixing bug in LOG_LEVEL_LOG
61 * Revision 1.6 2001/05/26 17:28:32 jongfoster
64 * Revision 1.5 2001/05/26 15:26:15 jongfoster
65 * ACL feature now provides more security by immediately dropping
66 * connections from untrusted hosts.
68 * Revision 1.4 2001/05/26 00:37:42 jongfoster
69 * Cosmetic indentation correction.
71 * Revision 1.3 2001/05/25 21:57:54 jongfoster
72 * Now gives a warning under Windows if you try to bind
73 * it to a port that's already in use.
75 * Revision 1.2 2001/05/17 23:01:01 oes
76 * - Cleaned CRLF's from the sources and related files
78 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
79 * Initial import of version 2.9.3 source tree
82 *********************************************************************/
92 #include <sys/types.h>
97 #include <sys/timeb.h>
103 #include <sys/time.h>
104 #include <netinet/in.h>
105 #include <sys/ioctl.h>
107 #include <sys/socket.h>
110 #include <netinet/tcp.h>
111 #include <arpa/inet.h>
119 #include "jbsockets.h"
123 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
126 /*********************************************************************
128 * Function : connect_to
130 * Description : Open a socket and connect to it. Will check
131 * that this is allowed according to ACL.
134 * 1 : host = hostname to connect to
135 * 2 : portnum = port to connent on
136 * 3 : csp = Current client state (buffers, headers, etc...)
137 * Not modified, only used for source IP and ACL.
139 * Returns : -1 => failure, else it is the socket file descriptor.
141 *********************************************************************/
142 int connect_to(const char *host, int portnum, struct client_state *csp)
144 struct sockaddr_in inaddr;
147 struct timeval tv[1];
148 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
150 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
153 struct access_control_addr dst[1];
154 #endif /* def ACL_FILES */
156 memset((char *)&inaddr, 0, sizeof inaddr);
158 if ((addr = resolve_hostname_to_ip(host)) == -1)
160 csp->http->host_ip_addr_str = strdup("unknown");
165 dst->addr = ntohl(addr);
168 if (block_acl(dst, csp))
173 #endif /* def ACL_FILES */
175 inaddr.sin_addr.s_addr = addr;
176 inaddr.sin_family = AF_INET;
177 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
179 if (sizeof(inaddr.sin_port) == sizeof(short))
181 inaddr.sin_port = htons((short)portnum);
185 inaddr.sin_port = htonl(portnum);
188 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
194 { /* turn off TCP coalescence */
196 setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
198 #endif /* def TCP_NODELAY */
200 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
201 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
204 fcntl(fd, F_SETFL, flags);
206 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
208 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == -1)
211 if (errno == WSAEINPROGRESS)
212 #else /* ifndef _WIN32 */
213 if (errno == EINPROGRESS)
214 #endif /* ndef _WIN32 */
226 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
230 fcntl(fd, F_SETFL, flags);
232 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
234 /* wait for connection to complete */
241 if (select(fd + 1, NULL, &wfds, NULL, tv) <= 0)
251 /*********************************************************************
253 * Function : write_socket
255 * Description : Write the contents of buf (for n bytes) to socket fd.
258 * 1 : fd = file descriptor (aka. handle) of socket to write to.
259 * 2 : buf = pointer to data to be written.
260 * 3 : len = length of data to be written to the socket "fd".
262 * Returns : Win32 & Unix: If no error occurs, returns the total number of
263 * bytes sent, which can be less than the number
264 * indicated by len. Otherwise, returns (-1).
266 *********************************************************************/
267 int write_socket(int fd, const char *buf, int len)
274 log_error(LOG_LEVEL_LOG, "%N", len, buf);
276 #if defined(_WIN32) || defined(__BEOS__) || defined(AMIGA)
277 return( send(fd, buf, len, 0));
279 return( write(fd, buf, len));
285 /*********************************************************************
287 * Function : read_socket
289 * Description : Read from a TCP/IP socket in a platform independent way.
292 * 1 : fd = file descriptor of the socket to read
293 * 2 : buf = pointer to buffer where data will be written
294 * Must be >= len bytes long.
295 * 3 : len = maximum number of bytes to read
297 * Returns : On success, the number of bytes read is returned (zero
298 * indicates end of file), and the file position is advanced
299 * by this number. It is not an error if this number is
300 * smaller than the number of bytes requested; this may hap-
301 * pen for example because fewer bytes are actually available
302 * right now (maybe because we were close to end-of-file, or
303 * because we are reading from a pipe, or from a terminal),
304 * or because read() was interrupted by a signal. On error,
305 * -1 is returned, and errno is set appropriately. In this
306 * case it is left unspecified whether the file position (if
309 *********************************************************************/
310 int read_socket(int fd, char *buf, int len)
317 #if defined(_WIN32) || defined(__BEOS__) || defined(AMIGA)
318 return( recv(fd, buf, len, 0));
320 return( read(fd, buf, len));
325 /*********************************************************************
327 * Function : close_socket
329 * Description : Closes a TCP/IP socket
332 * 1 : fd = file descriptor of socket to be closed
336 *********************************************************************/
337 void close_socket(int fd)
339 #if defined(_WIN32) || defined(__BEOS__)
350 /*********************************************************************
352 * Function : bind_port
354 * Description : Call socket, set socket options, and listen.
355 * Called by listen_loop to "boot up" our proxy address.
358 * 1 : hostnam = TCP/IP address to bind/listen to
359 * 2 : portnum = port to listen on
361 * Returns : if success, return file descriptor
362 * if failure, returns -2 if address is in use, otherwise -1
364 *********************************************************************/
365 int bind_port(const char *hostnam, int portnum)
367 struct sockaddr_in inaddr;
371 memset((char *)&inaddr, '\0', sizeof inaddr);
373 inaddr.sin_family = AF_INET;
374 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
376 if (sizeof(inaddr.sin_port) == sizeof(short))
378 inaddr.sin_port = htons((short)portnum);
382 inaddr.sin_port = htonl(portnum);
385 fd = socket(AF_INET, SOCK_STREAM, 0);
394 * FIXME: This is not needed for Win32 - in fact, it stops
395 * duplicate instances of JunkBuster from being caught.
396 * Is this really needed under UNIX, or should it be taked out?
399 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
400 #endif /* ndef _WIN32 */
402 if (bind (fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
406 if (errno == WSAEADDRINUSE)
408 if (errno == EADDRINUSE)
419 while (listen(fd, 5) == -1)
432 /*********************************************************************
434 * Function : accept_connection
436 * Description : Accepts a connection on a socket. Socket must have
437 * been created using bind_port().
440 * 1 : csp = Client state, cfd, ip_addr_str, and
441 * ip_addr_long will be set by this routine.
442 * 2 : fd = file descriptor returned from bind_port
444 * Returns : when a connection is accepted, it returns 1 (TRUE).
445 * On an error it returns 0 (FALSE).
447 *********************************************************************/
448 int accept_connection(struct client_state * csp, int fd)
450 struct sockaddr_in client, server;
451 struct hostent *host = NULL;
452 int afd, c_length, s_length;
454 c_length = s_length = sizeof(client);
458 afd = accept (fd, (struct sockaddr *) &client, &c_length);
459 } while (afd < 1 && errno == EINTR);
467 * Determine the IP-Adress that the client used to reach us
468 * and the hostname associated with that address
470 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
472 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
474 host = gethostbyaddr(&server.sin_addr, sizeof(server.sin_addr), AF_INET);
477 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
481 csp->my_hostname = strdup(host->h_name);
486 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
487 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
494 /*********************************************************************
496 * Function : resolve_hostname_to_ip
498 * Description : Resolve a hostname to an internet tcp/ip address.
499 * NULL or an empty string resolve to INADDR_ANY.
502 * 1 : host = hostname to resolve
504 * Returns : -1 => failure, INADDR_ANY or tcp/ip address if succesful.
506 *********************************************************************/
507 int resolve_hostname_to_ip(const char *host)
509 struct sockaddr_in inaddr;
510 struct hostent *hostp;
512 if ((host == NULL) || (*host == '\0'))
517 memset((char *) &inaddr, 0, sizeof inaddr);
519 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
521 if ((hostp = gethostbyname(host)) == NULL)
526 if (hostp->h_addrtype != AF_INET)
529 errno = WSAEPROTOTYPE;
536 (char *) &inaddr.sin_addr,
537 (char *) hostp->h_addr,
538 sizeof(inaddr.sin_addr)
541 return(inaddr.sin_addr.s_addr);