1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988 Regents of the University of California. 4 * All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)collect.c 6.12 (Berkeley) 03/23/93"; 11 #endif /* not lint */ 12 13 # include <errno.h> 14 # include "sendmail.h" 15 16 /* 17 ** COLLECT -- read & parse message header & make temp file. 18 ** 19 ** Creates a temporary file name and copies the standard 20 ** input to that file. Leading UNIX-style "From" lines are 21 ** stripped off (after important information is extracted). 22 ** 23 ** Parameters: 24 ** smtpmode -- if set, we are running SMTP: give an RFC821 25 ** style message to say we are ready to collect 26 ** input, and never ignore a single dot to mean 27 ** end of message. 28 ** 29 ** Returns: 30 ** none. 31 ** 32 ** Side Effects: 33 ** Temp file is created and filled. 34 ** The from person may be set. 35 */ 36 37 collect(smtpmode, e) 38 bool smtpmode; 39 register ENVELOPE *e; 40 { 41 register FILE *tf; 42 bool ignrdot = smtpmode ? FALSE : IgnrDot; 43 char buf[MAXLINE], buf2[MAXLINE]; 44 register char *workbuf, *freebuf; 45 extern char *hvalue(); 46 extern bool isheader(), flusheol(); 47 48 /* 49 ** Create the temp file name and create the file. 50 */ 51 52 e->e_df = newstr(queuename(e, 'd')); 53 if ((tf = dfopen(e->e_df, "w")) == NULL) 54 { 55 syserr("Cannot create %s", e->e_df); 56 NoReturn = TRUE; 57 finis(); 58 } 59 (void) chmod(e->e_df, FileMode); 60 61 /* 62 ** Tell ARPANET to go ahead. 63 */ 64 65 if (smtpmode) 66 message("354 Enter mail, end with \".\" on a line by itself"); 67 68 /* 69 ** Try to read a UNIX-style From line 70 */ 71 72 if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL) 73 goto readerr; 74 fixcrlf(buf, FALSE); 75 # ifndef NOTUNIX 76 if (!SaveFrom && strncmp(buf, "From ", 5) == 0) 77 { 78 if (!flusheol(buf, InChannel)) 79 goto readerr; 80 eatfrom(buf, e); 81 if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL) 82 goto readerr; 83 fixcrlf(buf, FALSE); 84 } 85 # endif /* NOTUNIX */ 86 87 /* 88 ** Copy InChannel to temp file & do message editing. 89 ** To keep certain mailers from getting confused, 90 ** and to keep the output clean, lines that look 91 ** like UNIX "From" lines are deleted in the header. 92 */ 93 94 workbuf = buf; /* `workbuf' contains a header field */ 95 freebuf = buf2; /* `freebuf' can be used for read-ahead */ 96 for (;;) 97 { 98 char *curbuf; 99 int curbuffree; 100 register int curbuflen; 101 char *p; 102 103 /* first, see if the header is over */ 104 if (!isheader(workbuf)) 105 { 106 fixcrlf(workbuf, TRUE); 107 break; 108 } 109 110 /* if the line is too long, throw the rest away */ 111 if (!flusheol(workbuf, InChannel)) 112 goto readerr; 113 114 /* it's okay to toss '\n' now (flusheol() needed it) */ 115 fixcrlf(workbuf, TRUE); 116 117 curbuf = workbuf; 118 curbuflen = strlen(curbuf); 119 curbuffree = MAXLINE - curbuflen; 120 p = curbuf + curbuflen; 121 122 /* get the rest of this field */ 123 for (;;) 124 { 125 int clen; 126 127 if (sfgets(freebuf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL) 128 goto readerr; 129 130 /* is this a continuation line? */ 131 if (*freebuf != ' ' && *freebuf != '\t') 132 break; 133 134 if (!flusheol(freebuf, InChannel)) 135 goto readerr; 136 137 fixcrlf(freebuf, TRUE); 138 clen = strlen(freebuf) + 1; 139 140 /* if insufficient room, dynamically allocate buffer */ 141 if (clen >= curbuffree) 142 { 143 /* reallocate buffer */ 144 int nbuflen = ((p - curbuf) + clen) * 2; 145 char *nbuf = xalloc(nbuflen); 146 147 p = nbuf + curbuflen; 148 curbuffree = nbuflen - curbuflen; 149 bcopy(curbuf, nbuf, curbuflen); 150 if (curbuf != buf && curbuf != buf2) 151 free(curbuf); 152 curbuf = nbuf; 153 } 154 *p++ = '\n'; 155 bcopy(freebuf, p, clen - 1); 156 p += clen - 1; 157 curbuffree -= clen; 158 curbuflen += clen; 159 } 160 *p++ = '\0'; 161 162 e->e_msgsize += curbuflen; 163 164 /* 165 ** The working buffer now becomes the free buffer, since 166 ** the free buffer contains a new header field. 167 ** 168 ** This is premature, since we still havent called 169 ** chompheader() to process the field we just created 170 ** (so the call to chompheader() will use `freebuf'). 171 ** This convolution is necessary so that if we break out 172 ** of the loop due to H_EOH, `workbuf' will always be 173 ** the next unprocessed buffer. 174 */ 175 176 { 177 register char *tmp = workbuf; 178 workbuf = freebuf; 179 freebuf = tmp; 180 } 181 182 /* 183 ** Snarf header away. 184 */ 185 186 if (bitset(H_EOH, chompheader(curbuf, FALSE, e))) 187 break; 188 189 /* 190 ** If the buffer was dynamically allocated, free it. 191 */ 192 193 if (curbuf != buf && curbuf != buf2) 194 free(curbuf); 195 } 196 197 if (tTd(30, 1)) 198 printf("EOH\n"); 199 200 if (*workbuf == '\0') 201 { 202 /* throw away a blank line */ 203 if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL) 204 goto readerr; 205 } 206 else if (workbuf == buf2) /* guarantee `buf' contains data */ 207 (void) strcpy(buf, buf2); 208 209 /* 210 ** Collect the body of the message. 211 */ 212 213 do 214 { 215 register char *bp = buf; 216 217 fixcrlf(buf, TRUE); 218 219 /* check for end-of-message */ 220 if (!ignrdot && buf[0] == '.' && (buf[1] == '\n' || buf[1] == '\0')) 221 break; 222 223 /* check for transparent dot */ 224 if (OpMode == MD_SMTP && bp[0] == '.' && bp[1] == '.') 225 bp++; 226 227 /* 228 ** Figure message length, output the line to the temp 229 ** file, and insert a newline if missing. 230 */ 231 232 e->e_msgsize += strlen(bp) + 1; 233 fputs(bp, tf); 234 fputs("\n", tf); 235 if (ferror(tf)) 236 tferror(tf, e); 237 } while (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) != NULL); 238 239 readerr: 240 if (fflush(tf) != 0) 241 tferror(tf, e); 242 (void) fclose(tf); 243 244 /* An EOF when running SMTP is an error */ 245 if ((feof(InChannel) || ferror(InChannel)) && OpMode == MD_SMTP) 246 { 247 char *host; 248 249 host = RealHostName; 250 if (host == NULL) 251 host = "localhost"; 252 253 # ifdef LOG 254 if (LogLevel > 0 && feof(InChannel)) 255 syslog(LOG_NOTICE, 256 "collect: unexpected close on connection from %s, sender=%s: %m\n", 257 host, e->e_from.q_paddr); 258 # endif 259 (feof(InChannel) ? usrerr : syserr) 260 ("451 collect: unexpected close on connection from %s, from=%s", 261 host, e->e_from.q_paddr); 262 263 /* don't return an error indication */ 264 e->e_to = NULL; 265 e->e_flags &= ~EF_FATALERRS; 266 267 /* and don't try to deliver the partial message either */ 268 finis(); 269 } 270 271 /* 272 ** Find out some information from the headers. 273 ** Examples are who is the from person & the date. 274 */ 275 276 eatheader(e); 277 278 /* 279 ** Add an Apparently-To: line if we have no recipient lines. 280 */ 281 282 if (hvalue("to", e) == NULL && hvalue("cc", e) == NULL && 283 hvalue("bcc", e) == NULL && hvalue("apparently-to", e) == NULL) 284 { 285 register ADDRESS *q; 286 287 /* create an Apparently-To: field */ 288 /* that or reject the message.... */ 289 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 290 { 291 if (q->q_alias != NULL) 292 continue; 293 if (tTd(30, 3)) 294 printf("Adding Apparently-To: %s\n", q->q_paddr); 295 addheader("apparently-to", q->q_paddr, e); 296 } 297 } 298 299 if ((e->e_dfp = fopen(e->e_df, "r")) == NULL) 300 { 301 /* we haven't acked receipt yet, so just chuck this */ 302 syserr("Cannot reopen %s", e->e_df); 303 finis(); 304 } 305 } 306 /* 307 ** FLUSHEOL -- if not at EOL, throw away rest of input line. 308 ** 309 ** Parameters: 310 ** buf -- last line read in (checked for '\n'), 311 ** fp -- file to be read from. 312 ** 313 ** Returns: 314 ** FALSE on error from sfgets(), TRUE otherwise. 315 ** 316 ** Side Effects: 317 ** none. 318 */ 319 320 bool 321 flusheol(buf, fp) 322 char *buf; 323 FILE *fp; 324 { 325 register char *p = buf; 326 bool printmsg = TRUE; 327 char junkbuf[MAXLINE]; 328 extern char *sfgets(); 329 330 while (strchr(p, '\n') == NULL) 331 { 332 if (printmsg) 333 usrerr("553 header line too long"); 334 printmsg = FALSE; 335 if (sfgets(junkbuf, MAXLINE, fp, TimeOuts.to_datablock) == NULL) 336 return (FALSE); 337 p = junkbuf; 338 } 339 340 return (TRUE); 341 } 342 /* 343 ** TFERROR -- signal error on writing the temporary file. 344 ** 345 ** Parameters: 346 ** tf -- the file pointer for the temporary file. 347 ** 348 ** Returns: 349 ** none. 350 ** 351 ** Side Effects: 352 ** Gives an error message. 353 ** Arranges for following output to go elsewhere. 354 */ 355 356 tferror(tf, e) 357 FILE *tf; 358 register ENVELOPE *e; 359 { 360 if (errno == ENOSPC) 361 { 362 (void) freopen(e->e_df, "w", tf); 363 fputs("\nMAIL DELETED BECAUSE OF LACK OF DISK SPACE\n\n", tf); 364 usrerr("452 Out of disk space for temp file"); 365 } 366 else 367 syserr("collect: Cannot write %s", e->e_df); 368 (void) freopen("/dev/null", "w", tf); 369 } 370 /* 371 ** EATFROM -- chew up a UNIX style from line and process 372 ** 373 ** This does indeed make some assumptions about the format 374 ** of UNIX messages. 375 ** 376 ** Parameters: 377 ** fm -- the from line. 378 ** 379 ** Returns: 380 ** none. 381 ** 382 ** Side Effects: 383 ** extracts what information it can from the header, 384 ** such as the date. 385 */ 386 387 # ifndef NOTUNIX 388 389 char *DowList[] = 390 { 391 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL 392 }; 393 394 char *MonthList[] = 395 { 396 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 397 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", 398 NULL 399 }; 400 401 eatfrom(fm, e) 402 char *fm; 403 register ENVELOPE *e; 404 { 405 register char *p; 406 register char **dt; 407 408 if (tTd(30, 2)) 409 printf("eatfrom(%s)\n", fm); 410 411 /* find the date part */ 412 p = fm; 413 while (*p != '\0') 414 { 415 /* skip a word */ 416 while (*p != '\0' && *p != ' ') 417 p++; 418 while (*p == ' ') 419 p++; 420 if (!(isascii(*p) && isupper(*p)) || 421 p[3] != ' ' || p[13] != ':' || p[16] != ':') 422 continue; 423 424 /* we have a possible date */ 425 for (dt = DowList; *dt != NULL; dt++) 426 if (strncmp(*dt, p, 3) == 0) 427 break; 428 if (*dt == NULL) 429 continue; 430 431 for (dt = MonthList; *dt != NULL; dt++) 432 if (strncmp(*dt, &p[4], 3) == 0) 433 break; 434 if (*dt != NULL) 435 break; 436 } 437 438 if (*p != NULL) 439 { 440 char *q; 441 extern char *arpadate(); 442 443 /* we have found a date */ 444 q = xalloc(25); 445 (void) strncpy(q, p, 25); 446 q[24] = '\0'; 447 q = arpadate(q); 448 define('a', newstr(q), e); 449 } 450 } 451 452 # endif /* NOTUNIX */ 453