contrib/sendmail-8.13.7/rmail/rmail.c

   1 /*
   2  * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * By using this file, you agree to the terms and conditions set
   8  * forth in the LICENSE file which can be found at the top level of
   9  * the sendmail distribution.
  10  *
  11  */
  12
  13 #include <sm/gen.h>
  14
  15 SM_IDSTR(copyright,
  16 "@(#) Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.\n\
  17         All rights reserved.\n\
  18      Copyright (c) 1988, 1993\n\
  19         The Regents of the University of California.  All rights reserved.\n")
  20
  21 SM_IDSTR(id, "@(#)$Id: rmail.c,v 8.61 2001/09/18 21:45:29 gshapiro Exp $")
  22
  23 /*
  24  * RMAIL -- UUCP mail server.
  25  *
  26  * This program reads the >From ... remote from ... lines that UUCP is so
  27  * fond of and turns them into something reasonable.  It then execs sendmail
  28  * with various options built from these lines.
  29  *
  30  * The expected syntax is:
  31  *
  32  *       <user> := [-a-z0-9]+
  33  *       <date> := ctime format
  34  *       <site> := [-a-z0-9!]+
  35  * <blank line> := "^\n$"
  36  *       <from> := "From" <space> <user> <space> <date>
  37  *                [<space> "remote from" <space> <site>]
  38  *    <forward> := ">" <from>
  39  *          msg := <from> <forward>* <blank-line> <body>
  40  *
  41  * The output of rmail(8) compresses the <forward> lines into a single
  42  * from path.
  43  *
  44  * The err(3) routine is included here deliberately to make this code
  45  * a bit more portable.
  46  */
  47
  48 #include <sys/types.h>
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51 #include <sys/wait.h>
  52
  53 #include <ctype.h>
  54 #include <fcntl.h>
  55 #include <sm/io.h>
  56 #include <stdlib.h>
  57 #include <sm/string.h>
  58 #include <unistd.h>
  59 #ifdef EX_OK
  60 # undef EX_OK           /* unistd.h may have another use for this */
  61 #endif /* EX_OK */
  62 #include <sysexits.h>
  63
  64 #include <sm/conf.h>
  65 #include <sm/errstring.h>
  66 #include <sendmail/pathnames.h>
  67
  68 static void err __P((int, const char *, ...));
  69 static void usage __P((void));
  70 static char *xalloc __P((int));
  71
  72 #define newstr(s)       strcpy(xalloc(strlen(s) + 1), s)
  73
  74 static char *
  75 xalloc(sz)
  76         register int sz;
  77 {
  78         register char *p;
  79
  80         /* some systems can't handle size zero mallocs */
  81         if (sz <= 0)
  82                 sz = 1;
  83
  84         p = malloc(sz);
  85         if (p == NULL)
  86                 err(EX_TEMPFAIL, "out of memory");
  87         return (p);
  88 }
  89
  90 int
  91 main(argc, argv)
  92         int argc;
  93         char *argv[];
  94 {
  95         int ch, debug, i, pdes[2], pid, status;
  96         size_t fplen = 0, fptlen = 0, len;
  97         off_t offset;
  98         SM_FILE_T *fp;
  99         char *addrp = NULL, *domain, *p, *t;
 100         char *from_path, *from_sys, *from_user;
 101         char **args, buf[2048], lbuf[2048];
 102         struct stat sb;
 103         extern char *optarg;
 104         extern int optind;
 105
 106         debug = 0;
 107         domain = "UUCP";                /* Default "domain". */
 108         while ((ch = getopt(argc, argv, "D:T")) != -1)
 109         {
 110                 switch (ch)
 111                 {
 112                   case 'T':
 113                         debug = 1;
 114                         break;
 115
 116                   case 'D':
 117                         domain = optarg;
 118                         break;
 119
 120                   case '?':
 121                   default:
 122                         usage();
 123                 }
 124         }
 125
 126         argc -= optind;
 127         argv += optind;
 128
 129         if (argc < 1)
 130                 usage();
 131
 132         from_path = from_sys = from_user = NULL;
 133         for (offset = 0; ; )
 134         {
 135                 /* Get and nul-terminate the line. */
 136                 if (sm_io_fgets(smioin, SM_TIME_DEFAULT, lbuf,
 137                                 sizeof(lbuf)) == NULL)
 138                         err(EX_DATAERR, "no data");
 139                 if ((p = strchr(lbuf, '\n')) == NULL)
 140                         err(EX_DATAERR, "line too long");
 141                 *p = '\0';
 142
 143                 /* Parse lines until reach a non-"From" line. */
 144                 if (!strncmp(lbuf, "From ", 5))
 145                         addrp = lbuf + 5;
 146                 else if (!strncmp(lbuf, ">From ", 6))
 147                         addrp = lbuf + 6;
 148                 else if (offset == 0)
 149                         err(EX_DATAERR,
 150                             "missing or empty From line: %s", lbuf);
 151                 else
 152                 {
 153                         *p = '\n';
 154                         break;
 155                 }
 156
 157                 if (addrp == NULL || *addrp == '\0')
 158                         err(EX_DATAERR, "corrupted From line: %s", lbuf);
 159
 160                 /* Use the "remote from" if it exists. */
 161                 for (p = addrp; (p = strchr(p + 1, 'r')) != NULL; )
 162                 {
 163                         if (!strncmp(p, "remote from ", 12))
 164                         {
 165                                 for (t = p += 12; *t != '\0'; ++t)
 166                                 {
 167                                         if (isascii(*t) && isspace(*t))
 168                                                 break;
 169                                 }
 170                                 *t = '\0';
 171                                 if (debug)
 172                                         (void) sm_io_fprintf(smioerr,
 173                                                              SM_TIME_DEFAULT,
 174                                                              "remote from: %s\n",
 175                                                              p);
 176                                 break;
 177                         }
 178                 }
 179
 180                 /* Else use the string up to the last bang. */
 181                 if (p == NULL)
 182                 {
 183                         if (*addrp == '!')
 184                                 err(EX_DATAERR, "bang starts address: %s",
 185                                     addrp);
 186                         else if ((t = strrchr(addrp, '!')) != NULL)
 187                         {
 188                                 *t = '\0';
 189                                 p = addrp;
 190                                 addrp = t + 1;
 191                                 if (*addrp == '\0')
 192                                         err(EX_DATAERR,
 193                                             "corrupted From line: %s", lbuf);
 194                                 if (debug)
 195                                         (void) sm_io_fprintf(smioerr,
 196                                                              SM_TIME_DEFAULT,
 197                                                              "bang: %s\n", p);
 198                         }
 199                 }
 200
 201                 /* 'p' now points to any system string from this line. */
 202                 if (p != NULL)
 203                 {
 204                         /* Nul terminate it as necessary. */
 205                         for (t = p; *t != '\0'; ++t)
 206                         {
 207                                 if (isascii(*t) && isspace(*t))
 208                                         break;
 209                         }
 210                         *t = '\0';
 211
 212                         /* If the first system, copy to the from_sys string. */
 213                         if (from_sys == NULL)
 214                         {
 215                                 from_sys = newstr(p);
 216                                 if (debug)
 217                                         (void) sm_io_fprintf(smioerr,
 218                                                              SM_TIME_DEFAULT,
 219                                                              "from_sys: %s\n",
 220                                                              from_sys);
 221                         }
 222
 223                         /* Concatenate to the path string. */
 224                         len = t - p;
 225                         if (from_path == NULL)
 226                         {
 227                                 fplen = 0;
 228                                 if ((from_path = malloc(fptlen = 256)) == NULL)
 229                                         err(EX_TEMPFAIL, "out of memory");
 230                         }
 231                         if (fplen + len + 2 > fptlen)
 232                         {
 233                                 fptlen += SM_MAX(fplen + len + 2, 256);
 234                                 if ((from_path = realloc(from_path,
 235                                                          fptlen)) == NULL)
 236                                         err(EX_TEMPFAIL, "out of memory");
 237                         }
 238                         memmove(from_path + fplen, p, len);
 239                         fplen += len;
 240                         from_path[fplen++] = '!';
 241                         from_path[fplen] = '\0';
 242                 }
 243
 244                 /* Save off from user's address; the last one wins. */
 245                 for (p = addrp; *p != '\0'; ++p)
 246                 {
 247                         if (isascii(*p) && isspace(*p))
 248                                 break;
 249                 }
 250                 *p = '\0';
 251                 if (*addrp == '\0')
 252                         addrp = "<>";
 253                 if (from_user != NULL)
 254                         free(from_user);
 255                 from_user = newstr(addrp);
 256
 257                 if (debug)
 258                 {
 259                         if (from_path != NULL)
 260                                 (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
 261                                                      "from_path: %s\n",
 262                                                      from_path);
 263                         (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
 264                                              "from_user: %s\n", from_user);
 265                 }
 266
 267                 if (offset != -1)
 268                         offset = (off_t)sm_io_tell(smioin, SM_TIME_DEFAULT);
 269         }
 270
 271
 272         /* Allocate args (with room for sendmail args as well as recipients */
 273         args = (char **)xalloc(sizeof(*args) * (10 + argc));
 274
 275         i = 0;
 276         args[i++] = _PATH_SENDMAIL;     /* Build sendmail's argument list. */
 277         args[i++] = "-G";               /* relay submission */
 278         args[i++] = "-oee";             /* No errors, just status. */
 279         args[i++] = "-odq";             /* Queue it, don't try to deliver. */
 280         args[i++] = "-oi";              /* Ignore '.' on a line by itself. */
 281
 282         /* set from system and protocol used */
 283         if (from_sys == NULL)
 284                 sm_snprintf(buf, sizeof(buf), "-p%s", domain);
 285         else if (strchr(from_sys, '.') == NULL)
 286                 sm_snprintf(buf, sizeof(buf), "-p%s:%s.%s",
 287                         domain, from_sys, domain);
 288         else
 289                 sm_snprintf(buf, sizeof(buf), "-p%s:%s", domain, from_sys);
 290         args[i++] = newstr(buf);
 291
 292         /* Set name of ``from'' person. */
 293         sm_snprintf(buf, sizeof(buf), "-f%s%s",
 294                  from_path ? from_path : "", from_user);
 295         args[i++] = newstr(buf);
 296
 297         /*
 298         **  Don't copy arguments beginning with - as they will be
 299         **  passed to sendmail and could be interpreted as flags.
 300         **  To prevent confusion of sendmail wrap < and > around
 301         **  the address (helps to pass addrs like @gw1,@gw2:aa@bb)
 302         */
 303
 304         while (*argv != NULL)
 305         {
 306                 if (**argv == '-')
 307                         err(EX_USAGE, "dash precedes argument: %s", *argv);
 308
 309                 if (strchr(*argv, ',') == NULL || strchr(*argv, '<') != NULL)
 310                         args[i++] = *argv;
 311                 else
 312                 {
 313                         len = strlen(*argv) + 3;
 314                         if ((args[i] = malloc(len)) == NULL)
 315                                 err(EX_TEMPFAIL, "Cannot malloc");
 316                         sm_snprintf(args[i++], len, "<%s>", *argv);
 317                 }
 318                 argv++;
 319                 argc--;
 320
 321                 /* Paranoia check, argc used for args[] bound */
 322                 if (argc < 0)
 323                         err(EX_SOFTWARE, "Argument count mismatch");
 324         }
 325         args[i] = NULL;
 326
 327         if (debug)
 328         {
 329                 (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
 330                                      "Sendmail arguments:\n");
 331                 for (i = 0; args[i] != NULL; i++)
 332                         (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
 333                                              "\t%s\n", args[i]);
 334         }
 335
 336         /*
 337         **  If called with a regular file as standard input, seek to the right
 338         **  position in the file and just exec sendmail.  Could probably skip
 339         **  skip the stat, but it's not unreasonable to believe that a failed
 340         **  seek will cause future reads to fail.
 341         */
 342
 343         if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode))
 344         {
 345                 if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset)
 346                         err(EX_TEMPFAIL, "stdin seek");
 347                 (void) execv(_PATH_SENDMAIL, args);
 348                 err(EX_OSERR, "%s", _PATH_SENDMAIL);
 349         }
 350
 351         if (pipe(pdes) < 0)
 352                 err(EX_OSERR, "pipe failed");
 353
 354         switch (pid = fork())
 355         {
 356           case -1:                              /* Err. */
 357                 err(EX_OSERR, "fork failed");
 358                 /* NOTREACHED */
 359
 360           case 0:                               /* Child. */
 361                 if (pdes[0] != STDIN_FILENO)
 362                 {
 363                         (void) dup2(pdes[0], STDIN_FILENO);
 364                         (void) close(pdes[0]);
 365                 }
 366                 (void) close(pdes[1]);
 367                 (void) execv(_PATH_SENDMAIL, args);
 368                 err(EX_UNAVAILABLE, "%s", _PATH_SENDMAIL);
 369                 /* NOTREACHED */
 370         }
 371
 372         if ((fp = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &(pdes[1]),
 373                              SM_IO_WRONLY, NULL)) == NULL)
 374                 err(EX_OSERR, "sm_io_open failed");
 375         (void) close(pdes[0]);
 376
 377         /* Copy the file down the pipe. */
 378         do
 379         {
 380                 (void) sm_io_fprintf(fp, SM_TIME_DEFAULT, "%s", lbuf);
 381         } while (sm_io_fgets(smioin, SM_TIME_DEFAULT, lbuf,
 382                              sizeof(lbuf)) != NULL);
 383
 384         if (sm_io_error(smioin))
 385                 err(EX_TEMPFAIL, "stdin: %s", sm_errstring(errno));
 386
 387         if (sm_io_close(fp, SM_TIME_DEFAULT))
 388                 err(EX_OSERR, "sm_io_close failed");
 389
 390         if ((waitpid(pid, &status, 0)) == -1)
 391                 err(EX_OSERR, "%s", _PATH_SENDMAIL);
 392
 393         if (!WIFEXITED(status))
 394                 err(EX_OSERR, "%s: did not terminate normally", _PATH_SENDMAIL);
 395
 396         if (WEXITSTATUS(status))
 397                 err(status, "%s: terminated with %d (non-zero) status",
 398                     _PATH_SENDMAIL, WEXITSTATUS(status));
 399         exit(EX_OK);
 400         /* NOTREACHED */
 401         return EX_OK;
 402 }
 403
 404 static void
 405 usage()
 406 {
 407         (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
 408                              "usage: rmail [-T] [-D domain] user ...\n");
 409         exit(EX_USAGE);
 410 }
 411
 412 static void
 413 #ifdef __STDC__
 414 err(int eval, const char *fmt, ...)
 415 #else /* __STDC__ */
 416 err(eval, fmt, va_alist)
 417         int eval;
 418         const char *fmt;
 419         va_dcl
 420 #endif /* __STDC__ */
 421 {
 422         SM_VA_LOCAL_DECL
 423
 424         if (fmt != NULL)
 425         {
 426                 SM_VA_START(ap, fmt);
 427                 (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "rmail: ");
 428                 (void) sm_io_vfprintf(smioerr, SM_TIME_DEFAULT, fmt, ap);
 429                 SM_VA_END(ap);
 430                 (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "\n");
 431         }
 432         exit(eval);
 433 }