1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1988, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)rmail.c 8.3 (Berkeley) 05/15/95"; 16 #endif /* not lint */ 17 18 /* 19 * RMAIL -- UUCP mail server. 20 * 21 * This program reads the >From ... remote from ... lines that UUCP is so 22 * fond of and turns them into something reasonable. It then execs sendmail 23 * with various options built from these lines. 24 * 25 * The expected syntax is: 26 * 27 * <user> := [-a-z0-9]+ 28 * <date> := ctime format 29 * <site> := [-a-z0-9!]+ 30 * <blank line> := "^\n$" 31 * <from> := "From" <space> <user> <space> <date> 32 * [<space> "remote from" <space> <site>] 33 * <forward> := ">" <from> 34 * msg := <from> <forward>* <blank-line> <body> 35 * 36 * The output of rmail(8) compresses the <forward> lines into a single 37 * from path. 38 * 39 * The err(3) routine is included here deliberately to make this code 40 * a bit more portable. 41 */ 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 #include <sys/wait.h> 45 46 #include <ctype.h> 47 #include <fcntl.h> 48 #include <paths.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <sysexits.h> 53 #include <unistd.h> 54 55 #ifndef MAX 56 # define MAX(a, b) ((a) < (b) ? (b) : (a)) 57 #endif 58 59 void err __P((int, const char *, ...)); 60 void usage __P((void)); 61 62 int 63 main(argc, argv) 64 int argc; 65 char *argv[]; 66 { 67 extern char *optarg; 68 extern int errno, optind; 69 FILE *fp; 70 struct stat sb; 71 size_t fplen, fptlen, len; 72 off_t offset; 73 int ch, debug, i, pdes[2], pid, status; 74 char *addrp, *domain, *p, *t; 75 char *from_path, *from_sys, *from_user; 76 char *args[100], buf[2048], lbuf[2048]; 77 78 debug = 0; 79 domain = "UUCP"; /* Default "domain". */ 80 while ((ch = getopt(argc, argv, "D:T")) != EOF) 81 switch (ch) { 82 case 'T': 83 debug = 1; 84 break; 85 case 'D': 86 domain = optarg; 87 break; 88 case '?': 89 default: 90 usage(); 91 } 92 argc -= optind; 93 argv += optind; 94 95 if (argc < 1) 96 usage(); 97 98 from_path = from_sys = from_user = NULL; 99 for (offset = 0;;) { 100 101 /* Get and nul-terminate the line. */ 102 if (fgets(lbuf, sizeof(lbuf), stdin) == NULL) 103 exit (EX_DATAERR); 104 if ((p = strchr(lbuf, '\n')) == NULL) 105 err(EX_DATAERR, "line too long"); 106 *p = '\0'; 107 108 /* Parse lines until reach a non-"From" line. */ 109 if (!strncmp(lbuf, "From ", 5)) 110 addrp = lbuf + 5; 111 else if (!strncmp(lbuf, ">From ", 6)) 112 addrp = lbuf + 6; 113 else if (offset == 0) 114 err(EX_DATAERR, 115 "missing or empty From line: %s", lbuf); 116 else { 117 *p = '\n'; 118 break; 119 } 120 121 if (*addrp == '\0') 122 err(EX_DATAERR, "corrupted From line: %s", lbuf); 123 124 /* Use the "remote from" if it exists. */ 125 for (p = addrp; (p = strchr(p + 1, 'r')) != NULL;) 126 if (!strncmp(p, "remote from ", 12)) { 127 for (t = p += 12; *t && !isspace(*t); ++t); 128 *t = '\0'; 129 if (debug) 130 (void)fprintf(stderr, 131 "remote from: %s\n", p); 132 break; 133 } 134 135 /* Else use the string up to the last bang. */ 136 if (p == NULL) 137 if (*addrp == '!') 138 err(EX_DATAERR, 139 "bang starts address: %s", addrp); 140 else if ((t = strrchr(addrp, '!')) != NULL) { 141 *t = '\0'; 142 p = addrp; 143 addrp = t + 1; 144 if (*addrp == '\0') 145 err(EX_DATAERR, 146 "corrupted From line: %s", lbuf); 147 if (debug) 148 (void)fprintf(stderr, "bang: %s\n", p); 149 } 150 151 /* 'p' now points to any system string from this line. */ 152 if (p != NULL) { 153 /* Nul terminate it as necessary. */ 154 for (t = p; *t && !isspace(*t); ++t); 155 *t = '\0'; 156 157 /* If the first system, copy to the from_sys string. */ 158 if (from_sys == NULL) { 159 if ((from_sys = strdup(p)) == NULL) 160 err(EX_TEMPFAIL, NULL); 161 if (debug) 162 (void)fprintf(stderr, 163 "from_sys: %s\n", from_sys); 164 } 165 166 /* Concatenate to the path string. */ 167 len = t - p; 168 if (from_path == NULL) { 169 fplen = 0; 170 if ((from_path = malloc(fptlen = 256)) == NULL) 171 err(EX_TEMPFAIL, NULL); 172 } 173 if (fplen + len + 2 > fptlen) { 174 fptlen += MAX(fplen + len + 2, 256); 175 if ((from_path = 176 realloc(from_path, fptlen)) == NULL) 177 err(EX_TEMPFAIL, NULL); 178 } 179 memmove(from_path + fplen, p, len); 180 fplen += len; 181 from_path[fplen++] = '!'; 182 from_path[fplen] = '\0'; 183 } 184 185 /* Save off from user's address; the last one wins. */ 186 for (p = addrp; *p && !isspace(*p); ++p); 187 *p = '\0'; 188 if (*addrp == '\0') 189 addrp = "<>"; 190 if (from_user != NULL) 191 free(from_user); 192 if ((from_user = strdup(addrp)) == NULL) 193 err(EX_TEMPFAIL, NULL); 194 195 if (debug) { 196 if (from_path != NULL) 197 (void)fprintf(stderr, 198 "from_path: %s\n", from_path); 199 (void)fprintf(stderr, "from_user: %s\n", from_user); 200 } 201 202 if (offset != -1) 203 offset = (off_t)ftell(stdin); 204 } 205 206 i = 0; 207 args[i++] = _PATH_SENDMAIL; /* Build sendmail's argument list. */ 208 args[i++] = "-oee"; /* No errors, just status. */ 209 args[i++] = "-odq"; /* Queue it, don't try to deliver. */ 210 args[i++] = "-oi"; /* Ignore '.' on a line by itself. */ 211 212 /* set from system and protocol used */ 213 if (from_sys == NULL) 214 (void)snprintf(buf, sizeof(buf), "-p%s", domain); 215 else if (strchr(from_sys, '.') == NULL) 216 (void)snprintf(buf, sizeof(buf), "-p%s:%s.%s", 217 domain, from_sys, domain); 218 else 219 (void)snprintf(buf, sizeof(buf), "-p%s:%s", domain, from_sys); 220 if ((args[i++] = strdup(buf)) == NULL) 221 err(EX_TEMPFAIL, NULL); 222 223 /* Set name of ``from'' person. */ 224 (void)snprintf(buf, sizeof(buf), "-f%s%s", 225 from_path ? from_path : "", from_user); 226 if ((args[i++] = strdup(buf)) == NULL) 227 err(EX_TEMPFAIL, NULL); 228 229 /* 230 * Don't copy arguments beginning with - as they will be 231 * passed to sendmail and could be interpreted as flags. 232 * To prevent confusion of sendmail wrap < and > around 233 * the address (helps to pass addrs like @gw1,@gw2:aa@bb) 234 */ 235 while (*argv) { 236 if (**argv == '-') 237 err(EX_USAGE, "dash precedes argument: %s", *argv); 238 if (strchr(*argv, ',') == NULL || strchr(*argv, '<') != NULL) 239 args[i++] = *argv; 240 else { 241 if ((args[i] = malloc(strlen(*argv) + 3)) == NULL) 242 err(EX_TEMPFAIL, "Cannot malloc"); 243 sprintf (args [i++], "<%s>", *argv); 244 } 245 argv++; 246 } 247 args[i] = 0; 248 249 if (debug) { 250 (void)fprintf(stderr, "Sendmail arguments:\n"); 251 for (i = 0; args[i]; i++) 252 (void)fprintf(stderr, "\t%s\n", args[i]); 253 } 254 255 /* 256 * If called with a regular file as standard input, seek to the right 257 * position in the file and just exec sendmail. Could probably skip 258 * skip the stat, but it's not unreasonable to believe that a failed 259 * seek will cause future reads to fail. 260 */ 261 if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode)) { 262 if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset) 263 err(EX_TEMPFAIL, "stdin seek"); 264 execv(_PATH_SENDMAIL, args); 265 err(EX_OSERR, "%s", _PATH_SENDMAIL); 266 } 267 268 if (pipe(pdes) < 0) 269 err(EX_OSERR, NULL); 270 271 switch (pid = vfork()) { 272 case -1: /* Err. */ 273 err(EX_OSERR, NULL); 274 case 0: /* Child. */ 275 if (pdes[0] != STDIN_FILENO) { 276 (void)dup2(pdes[0], STDIN_FILENO); 277 (void)close(pdes[0]); 278 } 279 (void)close(pdes[1]); 280 execv(_PATH_SENDMAIL, args); 281 _exit(127); 282 /* NOTREACHED */ 283 } 284 285 if ((fp = fdopen(pdes[1], "w")) == NULL) 286 err(EX_OSERR, NULL); 287 (void)close(pdes[0]); 288 289 /* Copy the file down the pipe. */ 290 do { 291 (void)fprintf(fp, "%s", lbuf); 292 } while (fgets(lbuf, sizeof(lbuf), stdin) != NULL); 293 294 if (ferror(stdin)) 295 err(EX_TEMPFAIL, "stdin: %s", strerror(errno)); 296 297 if (fclose(fp)) 298 err(EX_OSERR, NULL); 299 300 if ((waitpid(pid, &status, 0)) == -1) 301 err(EX_OSERR, "%s", _PATH_SENDMAIL); 302 303 if (!WIFEXITED(status)) 304 err(EX_OSERR, 305 "%s: did not terminate normally", _PATH_SENDMAIL); 306 307 if (WEXITSTATUS(status)) 308 err(status, "%s: terminated with %d (non-zero) status", 309 _PATH_SENDMAIL, WEXITSTATUS(status)); 310 exit(EX_OK); 311 } 312 313 void 314 usage() 315 { 316 (void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n"); 317 exit(EX_USAGE); 318 } 319 320 #ifdef __STDC__ 321 #include <stdarg.h> 322 #else 323 #include <varargs.h> 324 #endif 325 326 void 327 #ifdef __STDC__ 328 err(int eval, const char *fmt, ...) 329 #else 330 err(eval, fmt, va_alist) 331 int eval; 332 const char *fmt; 333 va_dcl 334 #endif 335 { 336 va_list ap; 337 #if __STDC__ 338 va_start(ap, fmt); 339 #else 340 va_start(ap); 341 #endif 342 (void)fprintf(stderr, "rmail: "); 343 (void)vfprintf(stderr, fmt, ap); 344 va_end(ap); 345 (void)fprintf(stderr, "\n"); 346 exit(eval); 347 } 348