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Diffstat (limited to 'usr.sbin/sendmail/src/collect.c')
-rw-r--r-- | usr.sbin/sendmail/src/collect.c | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/usr.sbin/sendmail/src/collect.c b/usr.sbin/sendmail/src/collect.c new file mode 100644 index 0000000..b77f6e9 --- /dev/null +++ b/usr.sbin/sendmail/src/collect.c @@ -0,0 +1,579 @@ +/* + * Copyright (c) 1983 Eric P. Allman + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)collect.c 8.14 (Berkeley) 4/18/94"; +#endif /* not lint */ + +# include <errno.h> +# include "sendmail.h" + +/* +** COLLECT -- read & parse message header & make temp file. +** +** Creates a temporary file name and copies the standard +** input to that file. Leading UNIX-style "From" lines are +** stripped off (after important information is extracted). +** +** Parameters: +** smtpmode -- if set, we are running SMTP: give an RFC821 +** style message to say we are ready to collect +** input, and never ignore a single dot to mean +** end of message. +** requeueflag -- this message will be requeued later, so +** don't do final processing on it. +** e -- the current envelope. +** +** Returns: +** none. +** +** Side Effects: +** Temp file is created and filled. +** The from person may be set. +*/ + +char *CollectErrorMessage; +bool CollectErrno; + +collect(smtpmode, requeueflag, e) + bool smtpmode; + bool requeueflag; + register ENVELOPE *e; +{ + register FILE *tf; + bool ignrdot = smtpmode ? FALSE : IgnrDot; + char buf[MAXLINE], buf2[MAXLINE]; + register char *workbuf, *freebuf; + bool inputerr = FALSE; + extern char *hvalue(); + extern bool isheader(), flusheol(); + + CollectErrorMessage = NULL; + CollectErrno = 0; + + /* + ** Create the temp file name and create the file. + */ + + e->e_df = queuename(e, 'd'); + e->e_df = newstr(e->e_df); + if ((tf = dfopen(e->e_df, O_WRONLY|O_CREAT|O_TRUNC, FileMode)) == NULL) + { + syserr("Cannot create %s", e->e_df); + NoReturn = TRUE; + finis(); + } + + /* + ** Tell ARPANET to go ahead. + */ + + if (smtpmode) + message("354 Enter mail, end with \".\" on a line by itself"); + + /* set global timer to monitor progress */ + sfgetset(TimeOuts.to_datablock); + + /* + ** Try to read a UNIX-style From line + */ + + if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock, + "initial message read") == NULL) + goto readerr; + fixcrlf(buf, FALSE); +# ifndef NOTUNIX + if (!SaveFrom && strncmp(buf, "From ", 5) == 0) + { + if (!flusheol(buf, InChannel)) + goto readerr; + eatfrom(buf, e); + if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock, + "message header read") == NULL) + goto readerr; + fixcrlf(buf, FALSE); + } +# endif /* NOTUNIX */ + + /* + ** Copy InChannel to temp file & do message editing. + ** To keep certain mailers from getting confused, + ** and to keep the output clean, lines that look + ** like UNIX "From" lines are deleted in the header. + */ + + workbuf = buf; /* `workbuf' contains a header field */ + freebuf = buf2; /* `freebuf' can be used for read-ahead */ + for (;;) + { + char *curbuf; + int curbuffree; + register int curbuflen; + char *p; + + /* first, see if the header is over */ + if (!isheader(workbuf)) + { + fixcrlf(workbuf, TRUE); + break; + } + + /* if the line is too long, throw the rest away */ + if (!flusheol(workbuf, InChannel)) + goto readerr; + + /* it's okay to toss '\n' now (flusheol() needed it) */ + fixcrlf(workbuf, TRUE); + + curbuf = workbuf; + curbuflen = strlen(curbuf); + curbuffree = MAXLINE - curbuflen; + p = curbuf + curbuflen; + + /* get the rest of this field */ + for (;;) + { + int clen; + + if (sfgets(freebuf, MAXLINE, InChannel, + TimeOuts.to_datablock, + "message header read") == NULL) + { + freebuf[0] = '\0'; + break; + } + + /* is this a continuation line? */ + if (*freebuf != ' ' && *freebuf != '\t') + break; + + if (!flusheol(freebuf, InChannel)) + goto readerr; + + fixcrlf(freebuf, TRUE); + clen = strlen(freebuf) + 1; + + /* if insufficient room, dynamically allocate buffer */ + if (clen >= curbuffree) + { + /* reallocate buffer */ + int nbuflen = ((p - curbuf) + clen) * 2; + char *nbuf = xalloc(nbuflen); + + p = nbuf + curbuflen; + curbuffree = nbuflen - curbuflen; + bcopy(curbuf, nbuf, curbuflen); + if (curbuf != buf && curbuf != buf2) + free(curbuf); + curbuf = nbuf; + } + *p++ = '\n'; + bcopy(freebuf, p, clen - 1); + p += clen - 1; + curbuffree -= clen; + curbuflen += clen; + } + *p++ = '\0'; + + e->e_msgsize += curbuflen; + + /* + ** The working buffer now becomes the free buffer, since + ** the free buffer contains a new header field. + ** + ** This is premature, since we still havent called + ** chompheader() to process the field we just created + ** (so the call to chompheader() will use `freebuf'). + ** This convolution is necessary so that if we break out + ** of the loop due to H_EOH, `workbuf' will always be + ** the next unprocessed buffer. + */ + + { + register char *tmp = workbuf; + workbuf = freebuf; + freebuf = tmp; + } + + /* + ** Snarf header away. + */ + + if (bitset(H_EOH, chompheader(curbuf, FALSE, e))) + break; + + /* + ** If the buffer was dynamically allocated, free it. + */ + + if (curbuf != buf && curbuf != buf2) + free(curbuf); + } + + if (tTd(30, 1)) + printf("EOH\n"); + + if (*workbuf == '\0') + { + /* throw away a blank line */ + if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock, + "message separator read") == NULL) + goto readerr; + } + else if (workbuf == buf2) /* guarantee `buf' contains data */ + (void) strcpy(buf, buf2); + + /* + ** Collect the body of the message. + */ + + for (;;) + { + register char *bp = buf; + + fixcrlf(buf, TRUE); + + /* check for end-of-message */ + if (!ignrdot && buf[0] == '.' && (buf[1] == '\n' || buf[1] == '\0')) + break; + + /* check for transparent dot */ + if ((OpMode == MD_SMTP || OpMode == MD_DAEMON) && + bp[0] == '.' && bp[1] == '.') + bp++; + + /* + ** Figure message length, output the line to the temp + ** file, and insert a newline if missing. + */ + + e->e_msgsize += strlen(bp) + 1; + fputs(bp, tf); + fputs("\n", tf); + if (ferror(tf)) + tferror(tf, e); + if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock, + "message body read") == NULL) + goto readerr; + } + + if (feof(InChannel) || ferror(InChannel)) + { +readerr: + if (tTd(30, 1)) + printf("collect: read error\n"); + inputerr = TRUE; + } + + /* reset global timer */ + sfgetset((time_t) 0); + + if (fflush(tf) != 0) + tferror(tf, e); + if (fsync(fileno(tf)) < 0 || fclose(tf) < 0) + { + tferror(tf, e); + finis(); + } + + if (CollectErrorMessage != NULL && Errors <= 0) + { + if (CollectErrno != 0) + { + errno = CollectErrno; + syserr(CollectErrorMessage, e->e_df); + finis(); + } + usrerr(CollectErrorMessage); + } + else if (inputerr && (OpMode == MD_SMTP || OpMode == MD_DAEMON)) + { + /* An EOF when running SMTP is an error */ + char *host; + char *problem; + + host = RealHostName; + if (host == NULL) + host = "localhost"; + + if (feof(InChannel)) + problem = "unexpected close"; + else if (ferror(InChannel)) + problem = "I/O error"; + else + problem = "read timeout"; +# ifdef LOG + if (LogLevel > 0 && feof(InChannel)) + syslog(LOG_NOTICE, + "collect: %s on connection from %s, sender=%s: %s\n", + problem, host, e->e_from.q_paddr, errstring(errno)); +# endif + if (feof(InChannel)) + usrerr("451 collect: %s on connection from %s, from=%s", + problem, host, e->e_from.q_paddr); + else + syserr("451 collect: %s on connection from %s, from=%s", + problem, host, e->e_from.q_paddr); + + /* don't return an error indication */ + e->e_to = NULL; + e->e_flags &= ~EF_FATALERRS; + e->e_flags |= EF_CLRQUEUE; + + /* and don't try to deliver the partial message either */ + if (InChild) + ExitStat = EX_QUIT; + finis(); + } + + /* + ** Find out some information from the headers. + ** Examples are who is the from person & the date. + */ + + eatheader(e, !requeueflag); + + /* collect statistics */ + if (OpMode != MD_VERIFY) + markstats(e, (ADDRESS *) NULL); + + /* + ** Add an Apparently-To: line if we have no recipient lines. + */ + + if (hvalue("to", e) == NULL && hvalue("cc", e) == NULL && + hvalue("bcc", e) == NULL && hvalue("apparently-to", e) == NULL) + { + register ADDRESS *q; + + /* create an Apparently-To: field */ + /* that or reject the message.... */ + for (q = e->e_sendqueue; q != NULL; q = q->q_next) + { + if (q->q_alias != NULL) + continue; + if (tTd(30, 3)) + printf("Adding Apparently-To: %s\n", q->q_paddr); + addheader("Apparently-To", q->q_paddr, e); + } + } + + /* check for message too large */ + if (MaxMessageSize > 0 && e->e_msgsize > MaxMessageSize) + { + usrerr("552 Message exceeds maximum fixed size (%ld)", + MaxMessageSize); + } + + if ((e->e_dfp = fopen(e->e_df, "r")) == NULL) + { + /* we haven't acked receipt yet, so just chuck this */ + syserr("Cannot reopen %s", e->e_df); + finis(); + } +} +/* +** FLUSHEOL -- if not at EOL, throw away rest of input line. +** +** Parameters: +** buf -- last line read in (checked for '\n'), +** fp -- file to be read from. +** +** Returns: +** FALSE on error from sfgets(), TRUE otherwise. +** +** Side Effects: +** none. +*/ + +bool +flusheol(buf, fp) + char *buf; + FILE *fp; +{ + register char *p = buf; + char junkbuf[MAXLINE]; + + while (strchr(p, '\n') == NULL) + { + CollectErrorMessage = "553 header line too long"; + CollectErrno = 0; + if (sfgets(junkbuf, MAXLINE, fp, TimeOuts.to_datablock, + "long line flush") == NULL) + return (FALSE); + p = junkbuf; + } + + return (TRUE); +} +/* +** TFERROR -- signal error on writing the temporary file. +** +** Parameters: +** tf -- the file pointer for the temporary file. +** +** Returns: +** none. +** +** Side Effects: +** Gives an error message. +** Arranges for following output to go elsewhere. +*/ + +tferror(tf, e) + FILE *tf; + register ENVELOPE *e; +{ + CollectErrno = errno; + if (errno == ENOSPC) + { + struct stat st; + long avail; + long bsize; + + NoReturn = TRUE; + if (fstat(fileno(tf), &st) < 0) + st.st_size = 0; + (void) freopen(e->e_df, "w", tf); + if (st.st_size <= 0) + fprintf(tf, "\n*** Mail could not be accepted"); + else if (sizeof st.st_size > sizeof (long)) + fprintf(tf, "\n*** Mail of at least %qd bytes could not be accepted\n", + st.st_size); + else + fprintf(tf, "\n*** Mail of at least %ld bytes could not be accepted\n", + st.st_size); + fprintf(tf, "*** at %s due to lack of disk space for temp file.\n", + MyHostName); + avail = freespace(QueueDir, &bsize); + if (avail > 0) + { + if (bsize > 1024) + avail *= bsize / 1024; + else if (bsize < 1024) + avail /= 1024 / bsize; + fprintf(tf, "*** Currently, %ld kilobytes are available for mail temp files.\n", + avail); + } + CollectErrorMessage = "452 Out of disk space for temp file"; + } + else + { + CollectErrorMessage = "cannot write message body to disk (%s)"; + } + (void) freopen("/dev/null", "w", tf); +} +/* +** EATFROM -- chew up a UNIX style from line and process +** +** This does indeed make some assumptions about the format +** of UNIX messages. +** +** Parameters: +** fm -- the from line. +** +** Returns: +** none. +** +** Side Effects: +** extracts what information it can from the header, +** such as the date. +*/ + +# ifndef NOTUNIX + +char *DowList[] = +{ + "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL +}; + +char *MonthList[] = +{ + "Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", + NULL +}; + +eatfrom(fm, e) + char *fm; + register ENVELOPE *e; +{ + register char *p; + register char **dt; + + if (tTd(30, 2)) + printf("eatfrom(%s)\n", fm); + + /* find the date part */ + p = fm; + while (*p != '\0') + { + /* skip a word */ + while (*p != '\0' && *p != ' ') + p++; + while (*p == ' ') + p++; + if (!(isascii(*p) && isupper(*p)) || + p[3] != ' ' || p[13] != ':' || p[16] != ':') + continue; + + /* we have a possible date */ + for (dt = DowList; *dt != NULL; dt++) + if (strncmp(*dt, p, 3) == 0) + break; + if (*dt == NULL) + continue; + + for (dt = MonthList; *dt != NULL; dt++) + if (strncmp(*dt, &p[4], 3) == 0) + break; + if (*dt != NULL) + break; + } + + if (*p != '\0') + { + char *q; + extern char *arpadate(); + + /* we have found a date */ + q = xalloc(25); + (void) strncpy(q, p, 25); + q[24] = '\0'; + q = arpadate(q); + define('a', newstr(q), e); + } +} + +# endif /* NOTUNIX */ |