1 /* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/socket.h> 50 #include <sys/stat.h> 51 #include <sys/file.h> 52 #include <sys/wait.h> 53 54 #include <netinet/in.h> 55 56 #include <ctype.h> 57 #include <err.h> 58 #include <errno.h> 59 #include <netdb.h> 60 #include <paths.h> 61 #include <pwd.h> 62 #include <termios.h> 63 #include <signal.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <syslog.h> 68 #include <unistd.h> 69 #include <utmpx.h> 70 71 int debug = 0; 72 #define dsyslog if (debug) syslog 73 74 #define MAXIDLE 120 75 76 char hostname[MAXHOSTNAMELEN]; 77 78 void jkfprintf(FILE *, char[], char[], off_t); 79 void mailfor(char *); 80 void notify(struct utmpx *, char[], off_t, int); 81 void reapchildren(int); 82 83 int 84 main(int argc __unused, char *argv[] __unused) 85 { 86 struct sockaddr_in from; 87 socklen_t fromlen; 88 int cc; 89 char msgbuf[256]; 90 91 /* verify proper invocation */ 92 fromlen = sizeof(from); 93 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) 94 err(1, "getsockname"); 95 openlog("comsat", LOG_PID, LOG_DAEMON); 96 if (chdir(_PATH_MAILDIR)) { 97 syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR); 98 (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0); 99 exit(1); 100 } 101 (void)gethostname(hostname, sizeof(hostname)); 102 (void)signal(SIGTTOU, SIG_IGN); 103 (void)signal(SIGCHLD, reapchildren); 104 for (;;) { 105 cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0); 106 if (cc <= 0) { 107 if (errno != EINTR) 108 sleep(1); 109 errno = 0; 110 continue; 111 } 112 msgbuf[cc] = '\0'; 113 mailfor(msgbuf); 114 sigsetmask(0L); 115 } 116 } 117 118 void 119 reapchildren(int signo __unused) 120 { 121 while (wait3(NULL, WNOHANG, NULL) > 0); 122 } 123 124 void 125 mailfor(char *name) 126 { 127 struct utmpx *utp; 128 char *cp; 129 char *file; 130 off_t offset; 131 int folder; 132 char buf[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1]; 133 char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1]; 134 135 if (!(cp = strchr(name, '@'))) 136 return; 137 *cp = '\0'; 138 offset = strtoll(cp + 1, NULL, 10); 139 if (!(cp = strchr(cp + 1, ':'))) 140 file = name; 141 else 142 file = cp + 1; 143 sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user), 144 name); 145 if (*file != '/') { 146 sprintf(buf2, "%s/%.*s", _PATH_MAILDIR, 147 (int)sizeof(utp->ut_user), file); 148 file = buf2; 149 } 150 folder = strcmp(buf, file); 151 setutxent(); 152 while ((utp = getutxent()) != NULL) 153 if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name)) 154 notify(utp, file, offset, folder); 155 endutxent(); 156 } 157 158 static const char *cr; 159 160 void 161 notify(struct utmpx *utp, char file[], off_t offset, int folder) 162 { 163 FILE *tp; 164 struct stat stb; 165 struct termios tio; 166 char tty[20]; 167 const char *s = utp->ut_line; 168 169 if (strncmp(s, "pts/", 4) == 0) 170 s += 4; 171 if (strchr(s, '/')) { 172 /* A slash is an attempt to break security... */ 173 syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'", 174 utp->ut_line); 175 return; 176 } 177 (void)snprintf(tty, sizeof(tty), "%s%.*s", 178 _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line); 179 if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) { 180 dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty); 181 return; 182 } 183 dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_user, tty); 184 switch (fork()) { 185 case -1: 186 syslog(LOG_NOTICE, "fork failed (%m)"); 187 return; 188 case 0: 189 break; 190 default: 191 return; 192 } 193 if ((tp = fopen(tty, "w")) == NULL) { 194 dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno)); 195 _exit(1); 196 } 197 (void)tcgetattr(fileno(tp), &tio); 198 cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r"; 199 switch (stb.st_mode & (S_IXUSR | S_IXGRP)) { 200 case S_IXUSR: 201 case (S_IXUSR | S_IXGRP): 202 (void)fprintf(tp, 203 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s", 204 cr, utp->ut_user, (int)sizeof(hostname), hostname, 205 folder ? cr : "", folder ? "to " : "", folder ? file : "", 206 cr, cr); 207 jkfprintf(tp, utp->ut_user, file, offset); 208 break; 209 case S_IXGRP: 210 (void)fprintf(tp, "\007"); 211 (void)fflush(tp); 212 (void)sleep(1); 213 (void)fprintf(tp, "\007"); 214 break; 215 default: 216 break; 217 } 218 (void)fclose(tp); 219 _exit(0); 220 } 221 222 void 223 jkfprintf(FILE *tp, char user[], char file[], off_t offset) 224 { 225 unsigned char *cp, ch; 226 FILE *fi; 227 int linecnt, charcnt, inheader; 228 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