comsat.c revision 267654
119304Speter/* 219304Speter * Copyright (c) 1980, 1993 319304Speter * The Regents of the University of California. All rights reserved. 419304Speter * 519304Speter * Redistribution and use in source and binary forms, with or without 619304Speter * modification, are permitted provided that the following conditions 719304Speter * are met: 819304Speter * 1. Redistributions of source code must retain the above copyright 919304Speter * notice, this list of conditions and the following disclaimer. 1019304Speter * 2. Redistributions in binary form must reproduce the above copyright 1119304Speter * notice, this list of conditions and the following disclaimer in the 1219304Speter * documentation and/or other materials provided with the distribution. 1319304Speter * 3. All advertising materials mentioning features or use of this software 1419304Speter * must display the following acknowledgement: 1519304Speter * This product includes software developed by the University of 1619304Speter * California, Berkeley and its contributors. 1719304Speter * 4. Neither the name of the University nor the names of its contributors 1819304Speter * may be used to endorse or promote products derived from this software 1919304Speter * without specific prior written permission. 2019304Speter * 2119304Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2219304Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2319304Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2419304Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2519304Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2619304Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2719304Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2819304Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2919304Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3019304Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3119304Speter * SUCH DAMAGE. 3219304Speter */ 3319304Speter 3419304Speter#ifndef lint 3519304Speterstatic const char copyright[] = 3619304Speter"@(#) Copyright (c) 1980, 1993\n\ 3719304Speter The Regents of the University of California. All rights reserved.\n"; 3819304Speter#endif /* not lint */ 3919304Speter 4019304Speter#ifndef lint 4119304Speter#if 0 4219304Speterstatic char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93"; 4319304Speter#endif 4419304Speterstatic const char rcsid[] = 4519304Speter "$FreeBSD: releng/9.3/libexec/comsat/comsat.c 222825 2011-06-07 16:23:27Z jh $"; 4619304Speter#endif /* not lint */ 4719304Speter 4819304Speter#include <sys/param.h> 4919304Speter#include <sys/socket.h> 5019304Speter#include <sys/stat.h> 5119304Speter#include <sys/file.h> 5219304Speter#include <sys/wait.h> 5319304Speter 5419304Speter#include <netinet/in.h> 5519304Speter 5619304Speter#include <ctype.h> 5719304Speter#include <err.h> 5819304Speter#include <errno.h> 5919304Speter#include <netdb.h> 6019304Speter#include <paths.h> 6119304Speter#include <pwd.h> 6219304Speter#include <termios.h> 6319304Speter#include <signal.h> 6419304Speter#include <stdio.h> 6519304Speter#include <stdlib.h> 6619304Speter#include <string.h> 6719304Speter#include <syslog.h> 6819304Speter#include <unistd.h> 6919304Speter#include <utmpx.h> 7019304Speter 7119304Speterint debug = 0; 7219304Speter#define dsyslog if (debug) syslog 7319304Speter 7419304Speter#define MAXIDLE 120 7519304Speter 7619304Speterchar hostname[MAXHOSTNAMELEN]; 7719304Speter 7819304Spetervoid jkfprintf(FILE *, char[], char[], off_t); 7919304Spetervoid mailfor(char *); 8019304Spetervoid notify(struct utmpx *, char[], off_t, int); 8119304Spetervoid reapchildren(int); 8219304Speter 8319304Speterint 8419304Spetermain(int argc __unused, char *argv[] __unused) 8519304Speter{ 8619304Speter struct sockaddr_in from; 8719304Speter socklen_t fromlen; 8819304Speter int cc; 8919304Speter char msgbuf[256]; 9019304Speter 9119304Speter /* verify proper invocation */ 9219304Speter fromlen = sizeof(from); 9319304Speter if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) 9419304Speter err(1, "getsockname"); 9519304Speter openlog("comsat", LOG_PID, LOG_DAEMON); 9619304Speter if (chdir(_PATH_MAILDIR)) { 9719304Speter syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR); 9819304Speter (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0); 9919304Speter exit(1); 10019304Speter } 10119304Speter (void)gethostname(hostname, sizeof(hostname)); 10219304Speter (void)signal(SIGTTOU, SIG_IGN); 10319304Speter (void)signal(SIGCHLD, reapchildren); 10419304Speter for (;;) { 10519304Speter cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0); 10619304Speter if (cc <= 0) { 10719304Speter if (errno != EINTR) 10819304Speter sleep(1); 10919304Speter errno = 0; 11019304Speter continue; 11119304Speter } 11219304Speter msgbuf[cc] = '\0'; 11319304Speter mailfor(msgbuf); 11419304Speter sigsetmask(0L); 11519304Speter } 11619304Speter} 11719304Speter 11819304Spetervoid 11919304Speterreapchildren(int signo __unused) 12019304Speter{ 12119304Speter while (wait3(NULL, WNOHANG, NULL) > 0); 12219304Speter} 12319304Speter 12419304Spetervoid 12519304Spetermailfor(char *name) 12619304Speter{ 12719304Speter struct utmpx *utp; 12819304Speter char *cp; 12919304Speter char *file; 13019304Speter off_t offset; 13119304Speter int folder; 13219304Speter char buf[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1]; 13319304Speter char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1]; 13419304Speter 13519304Speter if (!(cp = strchr(name, '@'))) 13619304Speter return; 13719304Speter *cp = '\0'; 13819304Speter offset = strtoll(cp + 1, NULL, 10); 13919304Speter if (!(cp = strchr(cp + 1, ':'))) 14019304Speter file = name; 14119304Speter else 14219304Speter file = cp + 1; 14319304Speter sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user), 14419304Speter name); 14519304Speter if (*file != '/') { 14619304Speter sprintf(buf2, "%s/%.*s", _PATH_MAILDIR, 14719304Speter (int)sizeof(utp->ut_user), file); 14819304Speter file = buf2; 14919304Speter } 15019304Speter folder = strcmp(buf, file); 15119304Speter setutxent(); 15219304Speter while ((utp = getutxent()) != NULL) 15319304Speter if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name)) 15419304Speter notify(utp, file, offset, folder); 15519304Speter endutxent(); 15619304Speter} 15719304Speter 15819304Speterstatic const char *cr; 15919304Speter 16019304Spetervoid 16119304Speternotify(struct utmpx *utp, char file[], off_t offset, int folder) 16219304Speter{ 16319304Speter FILE *tp; 16419304Speter struct stat stb; 16519304Speter struct termios tio; 16619304Speter char tty[20]; 16719304Speter const char *s = utp->ut_line; 16819304Speter 16919304Speter if (strncmp(s, "pts/", 4) == 0) 17019304Speter s += 4; 17119304Speter if (strchr(s, '/')) { 17219304Speter /* A slash is an attempt to break security... */ 17319304Speter syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'", 17419304Speter utp->ut_line); 17519304Speter return; 17619304Speter } 17719304Speter (void)snprintf(tty, sizeof(tty), "%s%.*s", 17819304Speter _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line); 17919304Speter if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) { 18019304Speter dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty); 18119304Speter return; 18219304Speter } 18319304Speter dsyslog(LOG_DEBUG, "notify %s on %s", utp->ut_user, tty); 18419304Speter switch (fork()) { 18519304Speter case -1: 18619304Speter syslog(LOG_NOTICE, "fork failed (%m)"); 18719304Speter return; 18819304Speter case 0: 18919304Speter break; 19019304Speter default: 19119304Speter return; 19219304Speter } 19319304Speter if ((tp = fopen(tty, "w")) == NULL) { 19419304Speter dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno)); 19519304Speter _exit(1); 19619304Speter } 19719304Speter (void)tcgetattr(fileno(tp), &tio); 19819304Speter cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r"; 19919304Speter switch (stb.st_mode & (S_IXUSR | S_IXGRP)) { 20019304Speter case S_IXUSR: 20119304Speter case (S_IXUSR | S_IXGRP): 20219304Speter (void)fprintf(tp, 20319304Speter "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s", 20419304Speter cr, utp->ut_user, (int)sizeof(hostname), hostname, 20519304Speter folder ? cr : "", folder ? "to " : "", folder ? file : "", 20619304Speter cr, cr); 20719304Speter jkfprintf(tp, utp->ut_user, file, offset); 20819304Speter break; 20919304Speter case S_IXGRP: 21019304Speter (void)fprintf(tp, "\007"); 21119304Speter (void)fflush(tp); 21219304Speter (void)sleep(1); 21319304Speter (void)fprintf(tp, "\007"); 21419304Speter break; 21519304Speter default: 21619304Speter break; 21719304Speter } 21819304Speter (void)fclose(tp); 21919304Speter _exit(0); 22019304Speter} 22119304Speter 22219304Spetervoid 22319304Speterjkfprintf(FILE *tp, char user[], char file[], off_t offset) 22419304Speter{ 22519304Speter unsigned char *cp, ch; 22619304Speter FILE *fi; 22719304Speter int linecnt, charcnt, inheader; 22819304Speter struct passwd *p; 229 unsigned char line[BUFSIZ]; 230 231 /* Set effective uid to user in case mail drop is on nfs */ 232 if ((p = getpwnam(user)) != NULL) 233 (void) setuid(p->pw_uid); 234 235 if ((fi = fopen(file, "r")) == NULL) 236 return; 237 238 (void)fseeko(fi, offset, SEEK_CUR); 239 /* 240 * Print the first 7 lines or 560 characters of the new mail 241 * (whichever comes first). Skip header crap other than 242 * From, Subject, To, and Date. 243 */ 244 linecnt = 7; 245 charcnt = 560; 246 inheader = 1; 247 while (fgets(line, sizeof(line), fi) != NULL) { 248 if (inheader) { 249 if (line[0] == '\n') { 250 inheader = 0; 251 continue; 252 } 253 if (line[0] == ' ' || line[0] == '\t' || 254 (strncmp(line, "From:", 5) && 255 strncmp(line, "Subject:", 8))) 256 continue; 257 } 258 if (linecnt <= 0 || charcnt <= 0) { 259 (void)fprintf(tp, "...more...%s", cr); 260 (void)fclose(fi); 261 return; 262 } 263 /* strip weird stuff so can't trojan horse stupid terminals */ 264 for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) { 265 /* disable upper controls and enable all other 266 8bit codes due to lack of locale knowledge 267 */ 268 if (((ch & 0x80) && ch < 0xA0) || 269 (!(ch & 0x80) && !isprint(ch) && 270 !isspace(ch) && ch != '\a' && ch != '\b') 271 ) { 272 if (ch & 0x80) { 273 ch &= ~0x80; 274 (void)fputs("M-", tp); 275 } 276 if (iscntrl(ch)) { 277 ch ^= 0x40; 278 (void)fputc('^', tp); 279 } 280 } 281 (void)fputc(ch, tp); 282 } 283 (void)fputs(cr, tp); 284 --linecnt; 285 } 286 (void)fprintf(tp, "----%s\n", cr); 287 (void)fclose(fi); 288} 289