diff options
Diffstat (limited to 'contrib/tcp_wrappers/rfc931.c')
| -rw-r--r-- | contrib/tcp_wrappers/rfc931.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/contrib/tcp_wrappers/rfc931.c b/contrib/tcp_wrappers/rfc931.c deleted file mode 100644 index 8176417b8fd6..000000000000 --- a/contrib/tcp_wrappers/rfc931.c +++ /dev/null @@ -1,165 +0,0 @@ - /* - * rfc931() speaks a common subset of the RFC 931, AUTH, TAP, IDENT and RFC - * 1413 protocols. It queries an RFC 931 etc. compatible daemon on a remote - * host to look up the owner of a connection. The information should not be - * used for authentication purposes. This routine intercepts alarm signals. - * - * Diagnostics are reported through syslog(3). - * - * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. - */ - -#ifndef lint -static char sccsid[] = "@(#) rfc931.c 1.10 95/01/02 16:11:34"; -#endif - -/* System libraries. */ - -#include <stdio.h> -#include <syslog.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <setjmp.h> -#include <signal.h> -#include <string.h> - -/* Local stuff. */ - -#include "tcpd.h" - -#define RFC931_PORT 113 /* Semi-well-known port */ -#define ANY_PORT 0 /* Any old port will do */ - -int rfc931_timeout = RFC931_TIMEOUT;/* Global so it can be changed */ - -static jmp_buf timebuf; - -/* fsocket - open stdio stream on top of socket */ - -static FILE *fsocket(domain, type, protocol) -int domain; -int type; -int protocol; -{ - int s; - FILE *fp; - - if ((s = socket(domain, type, protocol)) < 0) { - tcpd_warn("socket: %m"); - return (0); - } else { - if ((fp = fdopen(s, "r+")) == 0) { - tcpd_warn("fdopen: %m"); - close(s); - } - return (fp); - } -} - -/* timeout - handle timeouts */ - -static void timeout(sig) -int sig; -{ - longjmp(timebuf, sig); -} - -/* rfc931 - return remote user name, given socket structures */ - -void rfc931(rmt_sin, our_sin, dest) -struct sockaddr_in *rmt_sin; -struct sockaddr_in *our_sin; -char *dest; -{ - unsigned rmt_port; - unsigned our_port; - struct sockaddr_in rmt_query_sin; - struct sockaddr_in our_query_sin; - char user[256]; /* XXX */ - char buffer[512]; /* XXX */ - char *cp; - char *result = unknown; - FILE *fp; - - /* - * Use one unbuffered stdio stream for writing to and for reading from - * the RFC931 etc. server. This is done because of a bug in the SunOS - * 4.1.x stdio library. The bug may live in other stdio implementations, - * too. When we use a single, buffered, bidirectional stdio stream ("r+" - * or "w+" mode) we read our own output. Such behaviour would make sense - * with resources that support random-access operations, but not with - * sockets. - */ - - if ((fp = fsocket(AF_INET, SOCK_STREAM, 0)) != 0) { - setbuf(fp, (char *) 0); - - /* - * Set up a timer so we won't get stuck while waiting for the server. - */ - - if (setjmp(timebuf) == 0) { - signal(SIGALRM, timeout); - alarm(rfc931_timeout); - - /* - * Bind the local and remote ends of the query socket to the same - * IP addresses as the connection under investigation. We go - * through all this trouble because the local or remote system - * might have more than one network address. The RFC931 etc. - * client sends only port numbers; the server takes the IP - * addresses from the query socket. - */ - - our_query_sin = *our_sin; - our_query_sin.sin_port = htons(ANY_PORT); - rmt_query_sin = *rmt_sin; - rmt_query_sin.sin_port = htons(RFC931_PORT); - - if (bind(fileno(fp), (struct sockaddr *) & our_query_sin, - sizeof(our_query_sin)) >= 0 && - connect(fileno(fp), (struct sockaddr *) & rmt_query_sin, - sizeof(rmt_query_sin)) >= 0) { - - /* - * Send query to server. Neglect the risk that a 13-byte - * write would have to be fragmented by the local system and - * cause trouble with buggy System V stdio libraries. - */ - - fprintf(fp, "%u,%u\r\n", - ntohs(rmt_sin->sin_port), - ntohs(our_sin->sin_port)); - fflush(fp); - - /* - * Read response from server. Use fgets()/sscanf() so we can - * work around System V stdio libraries that incorrectly - * assume EOF when a read from a socket returns less than - * requested. - */ - - if (fgets(buffer, sizeof(buffer), fp) != 0 - && ferror(fp) == 0 && feof(fp) == 0 - && sscanf(buffer, "%u , %u : USERID :%*[^:]:%255s", - &rmt_port, &our_port, user) == 3 - && ntohs(rmt_sin->sin_port) == rmt_port - && ntohs(our_sin->sin_port) == our_port) { - - /* - * Strip trailing carriage return. It is part of the - * protocol, not part of the data. - */ - - if (cp = strchr(user, '\r')) - *cp = 0; - result = user; - } - } - alarm(0); - } - fclose(fp); - } - STRN_CPY(dest, result, STRING_LENGTH); -} |