headers.c
上传用户:xu_441
上传日期:2007-01-04
资源大小:1640k
文件大小:37k
- /*
- * Copyright (c) 1998, 1999 Sendmail, Inc. and its suppliers.
- * All rights reserved.
- * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved.
- * Copyright (c) 1988, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * By using this file, you agree to the terms and conditions set
- * forth in the LICENSE file which can be found at the top level of
- * the sendmail distribution.
- *
- */
- #ifndef lint
- static char id[] = "@(#)$Id: headers.c,v 8.196 1999/12/07 00:00:37 gshapiro Exp $";
- #endif /* ! lint */
- #include <sendmail.h>
- static bool fix_mime_header __P((char *));
- static int priencode __P((char *));
- static void put_vanilla_header __P((HDR *, char *, MCI *));
- /*
- ** SETUPHEADERS -- initialize headers in symbol table
- **
- ** Parameters:
- ** none
- **
- ** Returns:
- ** none
- */
- void
- setupheaders()
- {
- struct hdrinfo *hi;
- STAB *s;
- for (hi = HdrInfo; hi->hi_field != NULL; hi++)
- {
- s = stab(hi->hi_field, ST_HEADER, ST_ENTER);
- s->s_header.hi_flags = hi->hi_flags;
- s->s_header.hi_ruleset = NULL;
- }
- }
- /*
- ** CHOMPHEADER -- process and save a header line.
- **
- ** Called by collect, readcf, and readqf to deal with header lines.
- **
- ** Parameters:
- ** line -- header as a text line.
- ** pflag -- flags:
- ** CHHDR_DEF: this is a default value.
- ** CHHDR_CHECK: call rulesets.
- ** hdrp -- a pointer to the place to save the header.
- ** e -- the envelope including this header.
- **
- ** Returns:
- ** flags for this header.
- **
- ** Side Effects:
- ** The header is saved on the header list.
- ** Contents of 'line' are destroyed.
- */
- static struct hdrinfo NormalHeader = { NULL, 0, NULL };
- u_long
- chompheader(line, pflag, hdrp, e)
- char *line;
- int *pflag;
- HDR **hdrp;
- register ENVELOPE *e;
- {
- u_char mid = ' ';
- register char *p;
- register HDR *h;
- HDR **hp;
- char *fname;
- char *fvalue;
- bool cond = FALSE;
- bool headeronly;
- STAB *s;
- struct hdrinfo *hi;
- bool nullheader = FALSE;
- BITMAP256 mopts;
- if (tTd(31, 6))
- {
- dprintf("chompheader: ");
- xputs(line);
- dprintf("n");
- }
- headeronly = hdrp != NULL;
- if (!headeronly)
- hdrp = &e->e_header;
- /* strip off options */
- clrbitmap(mopts);
- p = line;
- if (*p == '?')
- {
- /* have some */
- register char *q = strchr(p + 1, *p);
- if (q != NULL)
- {
- *q++ = ' ';
- while (*++p != ' ')
- setbitn(*p, mopts);
- p = q;
- }
- else
- syserr("553 5.3.0 header syntax error, line "%s"",
- line);
- cond = TRUE;
- }
- else if (!isascii(*p) || *p == '$')
- {
- int c;
- /* possibly macro conditional */
- c = *p & 0377;
- if (c == MACROEXPAND)
- {
- p++;
- mid = (u_char) *p++;
- }
- else if (c == '$')
- {
- p++;
- mid = (u_char)macid(p, NULL);
- if (bitset(0200, mid))
- p += strlen(macname(mid)) + 2;
- else
- p++;
- }
- }
- /* find canonical name */
- fname = p;
- while (isascii(*p) && isgraph(*p) && *p != ':')
- p++;
- fvalue = p;
- while (isascii(*p) && isspace(*p))
- p++;
- if (*p++ != ':' || fname == fvalue)
- {
- syserr("553 5.3.0 header syntax error, line "%s"", line);
- return 0;
- }
- *fvalue = ' ';
- /* strip field value on front */
- if (*p == ' ')
- p++;
- fvalue = p;
- /* if the field is null, go ahead and use the default */
- while (isascii(*p) && isspace(*p))
- p++;
- if (*p == ' ')
- nullheader = TRUE;
- /* security scan: long field names are end-of-header */
- if (strlen(fname) > 100)
- return H_EOH;
- /* check to see if it represents a ruleset call */
- if (bitset(*pflag, CHHDR_DEF))
- {
- char hbuf[50];
- (void) expand(fvalue, hbuf, sizeof hbuf, e);
- for (p = hbuf; isascii(*p) && isspace(*p); )
- p++;
- if ((*p++ & 0377) == CALLSUBR)
- {
- auto char *endp;
- bool strc;
- strc = *p == '+'; /* strip comments? */
- if (strc)
- ++p;
- if (strtorwset(p, &endp, ST_ENTER) > 0)
- {
- *endp = ' ';
- s = stab(fname, ST_HEADER, ST_ENTER);
- s->s_header.hi_ruleset = newstr(p);
- if (!strc)
- s->s_header.hi_flags |= H_STRIPCOMM;
- }
- return 0;
- }
- }
- /* see if it is a known type */
- s = stab(fname, ST_HEADER, ST_FIND);
- if (s != NULL)
- hi = &s->s_header;
- else
- hi = &NormalHeader;
- if (tTd(31, 9))
- {
- if (s == NULL)
- dprintf("no header flags matchn");
- else
- dprintf("header match, flags=%lx, ruleset=%sn",
- hi->hi_flags,
- hi->hi_ruleset == NULL ? "<NULL>" : hi->hi_ruleset);
- }
- /* see if this is a resent message */
- if (!bitset(*pflag, CHHDR_DEF) && !headeronly &&
- bitset(H_RESENT, hi->hi_flags))
- e->e_flags |= EF_RESENT;
- /* if this is an Errors-To: header keep track of it now */
- if (UseErrorsTo && !bitset(*pflag, CHHDR_DEF) && !headeronly &&
- bitset(H_ERRORSTO, hi->hi_flags))
- (void) sendtolist(fvalue, NULLADDR, &e->e_errorqueue, 0, e);
- /* if this means "end of header" quit now */
- if (!headeronly && bitset(H_EOH, hi->hi_flags))
- return hi->hi_flags;
- /*
- ** Horrible hack to work around problem with Lotus Notes SMTP
- ** mail gateway, which generates From: headers with newlines in
- ** them and the <address> on the second line. Although this is
- ** legal RFC 822, many MUAs don't handle this properly and thus
- ** never find the actual address.
- */
- if (bitset(H_FROM, hi->hi_flags) && SingleLineFromHeader)
- {
- while ((p = strchr(fvalue, 'n')) != NULL)
- *p = ' ';
- }
- /*
- ** If there is a check ruleset, verify it against the header.
- */
- if (bitset(*pflag, CHHDR_CHECK))
- {
- bool stripcom = FALSE;
- char *rs;
- /* no ruleset? look for default */
- rs = hi->hi_ruleset;
- if (rs == NULL)
- {
- s = stab("*", ST_HEADER, ST_FIND);
- if (s != NULL)
- {
- rs = (&s->s_header)->hi_ruleset;
- stripcom = bitset((&s->s_header)->hi_flags,
- H_STRIPCOMM);
- }
- }
- else
- stripcom = bitset(hi->hi_flags, H_STRIPCOMM);
- if (rs != NULL)
- {
- int l;
- char qval[MAXNAME];
- char hlen[16];
- char *sp, *dp;
- dp = qval;
- l = 0;
- dp[l++] = '"';
- for (sp = fvalue; *sp != ' ' && l < MAXNAME - 2; sp++)
- {
- switch(*sp)
- {
- case ' 11': /* ht */
- case ' 12': /* nl */
- case ' 13': /* vt */
- case ' 14': /* np */
- case ' 15': /* cr */
- dp[l++] = ' ';
- break;
- case '"':
- dp[l++] = '\';
- /* FALLTHROUGH */
- default:
- dp[l++] = *sp;
- break;
- }
- }
- dp[l++] = '"';
- dp[l++] = ' ';
- l = strlen(fvalue);
- snprintf(hlen, sizeof hlen, "%d", l);
- define(macid("{hdrlen}", NULL), newstr(hlen), e);
- if (l >= MAXNAME)
- {
- if (LogLevel > 9)
- sm_syslog(LOG_WARNING, e->e_id,
- "Warning: truncated header '%s' before check with '%s' len=%d max=%d",
- fname, rs, l, MAXNAME);
- }
- if ((sp = macvalue(macid("{currHeader}", NULL), e)) !=
- NULL)
- free(sp);
- define(macid("{currHeader}", NULL), newstr(qval), e);
- define(macid("{hdr_name}", NULL), newstr(fname), e);
- (void) rscheck(rs, fvalue, NULL, e, stripcom, TRUE);
- }
- }
- /*
- ** Drop explicit From: if same as what we would generate.
- ** This is to make MH (which doesn't always give a full name)
- ** insert the full name information in all circumstances.
- */
- p = "resent-from";
- if (!bitset(EF_RESENT, e->e_flags))
- p += 7;
- if (!bitset(*pflag, CHHDR_DEF) && !headeronly &&
- !bitset(EF_QUEUERUN, e->e_flags) && strcasecmp(fname, p) == 0)
- {
- if (tTd(31, 2))
- {
- dprintf("comparing header from (%s) against default (%s or %s)n",
- fvalue, e->e_from.q_paddr, e->e_from.q_user);
- }
- if (e->e_from.q_paddr != NULL &&
- e->e_from.q_mailer != NULL &&
- bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags) &&
- (strcmp(fvalue, e->e_from.q_paddr) == 0 ||
- strcmp(fvalue, e->e_from.q_user) == 0))
- return hi->hi_flags;
- }
- /* delete default value for this header */
- for (hp = hdrp; (h = *hp) != NULL; hp = &h->h_link)
- {
- if (strcasecmp(fname, h->h_field) == 0 &&
- bitset(H_DEFAULT, h->h_flags) &&
- !bitset(H_FORCE, h->h_flags))
- {
- if (nullheader)
- {
- /* user-supplied value was null */
- return 0;
- }
- h->h_value = NULL;
- if (!cond)
- {
- /* copy conditions from default case */
- memmove((char *)mopts, (char *)h->h_mflags,
- sizeof mopts);
- }
- h->h_macro = mid;
- }
- }
- /* create a new node */
- h = (HDR *) xalloc(sizeof *h);
- h->h_field = newstr(fname);
- h->h_value = newstr(fvalue);
- h->h_link = NULL;
- memmove((char *) h->h_mflags, (char *) mopts, sizeof mopts);
- h->h_macro = mid;
- *hp = h;
- h->h_flags = hi->hi_flags;
- /* strip EOH flag if parsing MIME headers */
- if (headeronly)
- h->h_flags &= ~H_EOH;
- if (bitset(*pflag, CHHDR_DEF))
- h->h_flags |= H_DEFAULT;
- if (cond || mid != ' ')
- h->h_flags |= H_CHECK;
- /* hack to see if this is a new format message */
- if (!bitset(*pflag, CHHDR_DEF) && !headeronly &&
- bitset(H_RCPT|H_FROM, h->h_flags) &&
- (strchr(fvalue, ',') != NULL || strchr(fvalue, '(') != NULL ||
- strchr(fvalue, '<') != NULL || strchr(fvalue, ';') != NULL))
- {
- e->e_flags &= ~EF_OLDSTYLE;
- }
- return h->h_flags;
- }
- /*
- ** ADDHEADER -- add a header entry to the end of the queue.
- **
- ** This bypasses the special checking of chompheader.
- **
- ** Parameters:
- ** field -- the name of the header field.
- ** value -- the value of the field.
- ** hdrlist -- an indirect pointer to the header structure list.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** adds the field on the list of headers for this envelope.
- */
- void
- addheader(field, value, hdrlist)
- char *field;
- char *value;
- HDR **hdrlist;
- {
- register HDR *h;
- STAB *s;
- HDR **hp;
- /* find info struct */
- s = stab(field, ST_HEADER, ST_FIND);
- /* find current place in list -- keep back pointer? */
- for (hp = hdrlist; (h = *hp) != NULL; hp = &h->h_link)
- {
- if (strcasecmp(field, h->h_field) == 0)
- break;
- }
- /* allocate space for new header */
- h = (HDR *) xalloc(sizeof *h);
- h->h_field = field;
- h->h_value = newstr(value);
- h->h_link = *hp;
- h->h_flags = H_DEFAULT;
- if (s != NULL)
- h->h_flags |= s->s_header.hi_flags;
- clrbitmap(h->h_mflags);
- h->h_macro = ' ';
- *hp = h;
- }
- /*
- ** HVALUE -- return value of a header.
- **
- ** Only "real" fields (i.e., ones that have not been supplied
- ** as a default) are used.
- **
- ** Parameters:
- ** field -- the field name.
- ** header -- the header list.
- **
- ** Returns:
- ** pointer to the value part.
- ** NULL if not found.
- **
- ** Side Effects:
- ** none.
- */
- char *
- hvalue(field, header)
- char *field;
- HDR *header;
- {
- register HDR *h;
- for (h = header; h != NULL; h = h->h_link)
- {
- if (!bitset(H_DEFAULT, h->h_flags) &&
- strcasecmp(h->h_field, field) == 0)
- return h->h_value;
- }
- return NULL;
- }
- /*
- ** ISHEADER -- predicate telling if argument is a header.
- **
- ** A line is a header if it has a single word followed by
- ** optional white space followed by a colon.
- **
- ** Header fields beginning with two dashes, although technically
- ** permitted by RFC822, are automatically rejected in order
- ** to make MIME work out. Without this we could have a technically
- ** legal header such as ``--"foo:bar"'' that would also be a legal
- ** MIME separator.
- **
- ** Parameters:
- ** h -- string to check for possible headerness.
- **
- ** Returns:
- ** TRUE if h is a header.
- ** FALSE otherwise.
- **
- ** Side Effects:
- ** none.
- */
- bool
- isheader(h)
- char *h;
- {
- register char *s = h;
- if (s[0] == '-' && s[1] == '-')
- return FALSE;
- while (*s > ' ' && *s != ':' && *s != ' ')
- s++;
- if (h == s)
- return FALSE;
- /* following technically violates RFC822 */
- while (isascii(*s) && isspace(*s))
- s++;
- return (*s == ':');
- }
- /*
- ** EATHEADER -- run through the stored header and extract info.
- **
- ** Parameters:
- ** e -- the envelope to process.
- ** full -- if set, do full processing (e.g., compute
- ** message priority). This should not be set
- ** when reading a queue file because some info
- ** needed to compute the priority is wrong.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** Sets a bunch of global variables from information
- ** in the collected header.
- ** Aborts the message if the hop count is exceeded.
- */
- void
- eatheader(e, full)
- register ENVELOPE *e;
- bool full;
- {
- register HDR *h;
- register char *p;
- int hopcnt = 0;
- char *msgid;
- char buf[MAXLINE];
- /*
- ** Set up macros for possible expansion in headers.
- */
- define('f', e->e_sender, e);
- define('g', e->e_sender, e);
- if (e->e_origrcpt != NULL && *e->e_origrcpt != ' ')
- define('u', e->e_origrcpt, e);
- else
- define('u', NULL, e);
- /* full name of from person */
- p = hvalue("full-name", e->e_header);
- if (p != NULL)
- {
- if (!rfc822_string(p))
- {
- /*
- ** Quote a full name with special characters
- ** as a comment so crackaddr() doesn't destroy
- ** the name portion of the address.
- */
- p = addquotes(p);
- }
- define('x', p, e);
- }
- if (tTd(32, 1))
- dprintf("----- collected header -----n");
- msgid = NULL;
- for (h = e->e_header; h != NULL; h = h->h_link)
- {
- if (tTd(32, 1))
- dprintf("%s: ", h->h_field);
- if (h->h_value == NULL)
- {
- if (tTd(32, 1))
- dprintf("<NULL>n");
- continue;
- }
- /* do early binding */
- if (bitset(H_DEFAULT, h->h_flags) &&
- !bitset(H_BINDLATE, h->h_flags))
- {
- if (tTd(32, 1))
- {
- dprintf("(");
- xputs(h->h_value);
- dprintf(") ");
- }
- expand(h->h_value, buf, sizeof buf, e);
- if (buf[0] != ' ')
- {
- if (bitset(H_FROM, h->h_flags))
- expand(crackaddr(buf), buf, sizeof buf, e);
- h->h_value = newstr(buf);
- h->h_flags &= ~H_DEFAULT;
- }
- }
- if (tTd(32, 1))
- {
- xputs(h->h_value);
- dprintf("n");
- }
- /* count the number of times it has been processed */
- if (bitset(H_TRACE, h->h_flags))
- hopcnt++;
- /* send to this person if we so desire */
- if (GrabTo && bitset(H_RCPT, h->h_flags) &&
- !bitset(H_DEFAULT, h->h_flags) &&
- (!bitset(EF_RESENT, e->e_flags) || bitset(H_RESENT, h->h_flags)))
- {
- #if 0
- int saveflags = e->e_flags;
- #endif /* 0 */
- (void) sendtolist(h->h_value, NULLADDR,
- &e->e_sendqueue, 0, e);
- #if 0
- /*
- ** Change functionality so a fatal error on an
- ** address doesn't affect the entire envelope.
- */
- /* delete fatal errors generated by this address */
- if (!bitset(EF_FATALERRS, saveflags))
- e->e_flags &= ~EF_FATALERRS;
- #endif /* 0 */
- }
- /* save the message-id for logging */
- p = "resent-message-id";
- if (!bitset(EF_RESENT, e->e_flags))
- p += 7;
- if (strcasecmp(h->h_field, p) == 0)
- {
- msgid = h->h_value;
- while (isascii(*msgid) && isspace(*msgid))
- msgid++;
- }
- }
- if (tTd(32, 1))
- dprintf("----------------------------n");
- /* if we are just verifying (that is, sendmail -t -bv), drop out now */
- if (OpMode == MD_VERIFY)
- return;
- /* store hop count */
- if (hopcnt > e->e_hopcount)
- e->e_hopcount = hopcnt;
- /* message priority */
- p = hvalue("precedence", e->e_header);
- if (p != NULL)
- e->e_class = priencode(p);
- if (e->e_class < 0)
- e->e_timeoutclass = TOC_NONURGENT;
- else if (e->e_class > 0)
- e->e_timeoutclass = TOC_URGENT;
- if (full)
- {
- e->e_msgpriority = e->e_msgsize
- - e->e_class * WkClassFact
- + e->e_nrcpts * WkRecipFact;
- }
- /* message timeout priority */
- p = hvalue("priority", e->e_header);
- if (p != NULL)
- {
- /* (this should be in the configuration file) */
- if (strcasecmp(p, "urgent") == 0)
- e->e_timeoutclass = TOC_URGENT;
- else if (strcasecmp(p, "normal") == 0)
- e->e_timeoutclass = TOC_NORMAL;
- else if (strcasecmp(p, "non-urgent") == 0)
- e->e_timeoutclass = TOC_NONURGENT;
- }
- /* date message originated */
- p = hvalue("posted-date", e->e_header);
- if (p == NULL)
- p = hvalue("date", e->e_header);
- if (p != NULL)
- define('a', p, e);
- /* check to see if this is a MIME message */
- if ((e->e_bodytype != NULL &&
- strcasecmp(e->e_bodytype, "8BITMIME") == 0) ||
- hvalue("MIME-Version", e->e_header) != NULL)
- {
- e->e_flags |= EF_IS_MIME;
- if (HasEightBits)
- e->e_bodytype = "8BITMIME";
- }
- else if ((p = hvalue("Content-Type", e->e_header)) != NULL)
- {
- /* this may be an RFC 1049 message */
- p = strpbrk(p, ";/");
- if (p == NULL || *p == ';')
- {
- /* yep, it is */
- e->e_flags |= EF_DONT_MIME;
- }
- }
- /*
- ** From person in antiquated ARPANET mode
- ** required by UK Grey Book e-mail gateways (sigh)
- */
- if (OpMode == MD_ARPAFTP)
- {
- register struct hdrinfo *hi;
- for (hi = HdrInfo; hi->hi_field != NULL; hi++)
- {
- if (bitset(H_FROM, hi->hi_flags) &&
- (!bitset(H_RESENT, hi->hi_flags) ||
- bitset(EF_RESENT, e->e_flags)) &&
- (p = hvalue(hi->hi_field, e->e_header)) != NULL)
- break;
- }
- if (hi->hi_field != NULL)
- {
- if (tTd(32, 2))
- dprintf("eatheader: setsender(*%s == %s)n",
- hi->hi_field, p);
- setsender(p, e, NULL, ' ', TRUE);
- }
- }
- /*
- ** Log collection information.
- */
- if (bitset(EF_LOGSENDER, e->e_flags) && LogLevel > 4)
- logsender(e, msgid);
- e->e_flags &= ~EF_LOGSENDER;
- }
- /*
- ** LOGSENDER -- log sender information
- **
- ** Parameters:
- ** e -- the envelope to log
- ** msgid -- the message id
- **
- ** Returns:
- ** none
- */
- void
- logsender(e, msgid)
- register ENVELOPE *e;
- char *msgid;
- {
- char *name;
- register char *sbp;
- register char *p;
- int l;
- char hbuf[MAXNAME + 1];
- char sbuf[MAXLINE + 1];
- char mbuf[MAXNAME + 1];
- /* don't allow newlines in the message-id */
- if (msgid != NULL)
- {
- l = strlen(msgid);
- if (l > sizeof mbuf - 1)
- l = sizeof mbuf - 1;
- memmove(mbuf, msgid, l);
- mbuf[l] = ' ';
- p = mbuf;
- while ((p = strchr(p, 'n')) != NULL)
- *p++ = ' ';
- }
- if (bitset(EF_RESPONSE, e->e_flags))
- name = "[RESPONSE]";
- else if ((name = macvalue('_', e)) != NULL)
- /* EMPTY */
- ;
- else if (RealHostName == NULL)
- name = "localhost";
- else if (RealHostName[0] == '[')
- name = RealHostName;
- else
- {
- name = hbuf;
- (void) snprintf(hbuf, sizeof hbuf, "%.80s", RealHostName);
- if (RealHostAddr.sa.sa_family != 0)
- {
- p = &hbuf[strlen(hbuf)];
- (void) snprintf(p, SPACELEFT(hbuf, p), " (%.100s)",
- anynet_ntoa(&RealHostAddr));
- }
- }
- /* some versions of syslog only take 5 printf args */
- #if (SYSLOG_BUFSIZE) >= 256
- sbp = sbuf;
- snprintf(sbp, SPACELEFT(sbuf, sbp),
- "from=%.200s, size=%ld, class=%d, nrcpts=%d",
- e->e_from.q_paddr == NULL ? "<NONE>" : e->e_from.q_paddr,
- e->e_msgsize, e->e_class, e->e_nrcpts);
- sbp += strlen(sbp);
- if (msgid != NULL)
- {
- snprintf(sbp, SPACELEFT(sbuf, sbp), ", msgid=%.100s", mbuf);
- sbp += strlen(sbp);
- }
- if (e->e_bodytype != NULL)
- {
- (void) snprintf(sbp, SPACELEFT(sbuf, sbp), ", bodytype=%.20s",
- e->e_bodytype);
- sbp += strlen(sbp);
- }
- p = macvalue('r', e);
- if (p != NULL)
- {
- (void) snprintf(sbp, SPACELEFT(sbuf, sbp), ", proto=%.20s", p);
- sbp += strlen(sbp);
- }
- p = macvalue(macid("{daemon_name}", NULL), e);
- if (p != NULL)
- {
- (void) snprintf(sbp, SPACELEFT(sbuf, sbp), ", daemon=%.20s", p);
- sbp += strlen(sbp);
- }
- sm_syslog(LOG_INFO, e->e_id,
- "%.850s, relay=%.100s",
- sbuf, name);
- #else /* (SYSLOG_BUFSIZE) >= 256 */
- sm_syslog(LOG_INFO, e->e_id,
- "from=%s",
- e->e_from.q_paddr == NULL ? "<NONE>"
- : shortenstring(e->e_from.q_paddr, 83));
- sm_syslog(LOG_INFO, e->e_id,
- "size=%ld, class=%ld, nrcpts=%d",
- e->e_msgsize, e->e_class, e->e_nrcpts);
- if (msgid != NULL)
- sm_syslog(LOG_INFO, e->e_id,
- "msgid=%s",
- shortenstring(mbuf, 83));
- sbp = sbuf;
- *sbp = ' ';
- if (e->e_bodytype != NULL)
- {
- snprintf(sbp, SPACELEFT(sbuf, sbp), "bodytype=%.20s, ", e->e_bodytype);
- sbp += strlen(sbp);
- }
- p = macvalue('r', e);
- if (p != NULL)
- {
- snprintf(sbp, SPACELEFT(sbuf, sbp), "proto=%.20s, ", p);
- sbp += strlen(sbp);
- }
- sm_syslog(LOG_INFO, e->e_id,
- "%.400srelay=%.100s", sbuf, name);
- #endif /* (SYSLOG_BUFSIZE) >= 256 */
- }
- /*
- ** PRIENCODE -- encode external priority names into internal values.
- **
- ** Parameters:
- ** p -- priority in ascii.
- **
- ** Returns:
- ** priority as a numeric level.
- **
- ** Side Effects:
- ** none.
- */
- static int
- priencode(p)
- char *p;
- {
- register int i;
- for (i = 0; i < NumPriorities; i++)
- {
- if (!strcasecmp(p, Priorities[i].pri_name))
- return Priorities[i].pri_val;
- }
- /* unknown priority */
- return 0;
- }
- /*
- ** CRACKADDR -- parse an address and turn it into a macro
- **
- ** This doesn't actually parse the address -- it just extracts
- ** it and replaces it with "$g". The parse is totally ad hoc
- ** and isn't even guaranteed to leave something syntactically
- ** identical to what it started with. However, it does leave
- ** something semantically identical.
- **
- ** This algorithm has been cleaned up to handle a wider range
- ** of cases -- notably quoted and backslash escaped strings.
- ** This modification makes it substantially better at preserving
- ** the original syntax.
- **
- ** Parameters:
- ** addr -- the address to be cracked.
- **
- ** Returns:
- ** a pointer to the new version.
- **
- ** Side Effects:
- ** none.
- **
- ** Warning:
- ** The return value is saved in local storage and should
- ** be copied if it is to be reused.
- */
- char *
- crackaddr(addr)
- register char *addr;
- {
- register char *p;
- register char c;
- int cmtlev;
- int realcmtlev;
- int anglelev, realanglelev;
- int copylev;
- int bracklev;
- bool qmode;
- bool realqmode;
- bool skipping;
- bool putgmac = FALSE;
- bool quoteit = FALSE;
- bool gotangle = FALSE;
- bool gotcolon = FALSE;
- register char *bp;
- char *buflim;
- char *bufhead;
- char *addrhead;
- static char buf[MAXNAME + 1];
- if (tTd(33, 1))
- dprintf("crackaddr(%s)n", addr);
- /* strip leading spaces */
- while (*addr != ' ' && isascii(*addr) && isspace(*addr))
- addr++;
- /*
- ** Start by assuming we have no angle brackets. This will be
- ** adjusted later if we find them.
- */
- bp = bufhead = buf;
- buflim = &buf[sizeof buf - 7];
- p = addrhead = addr;
- copylev = anglelev = realanglelev = cmtlev = realcmtlev = 0;
- bracklev = 0;
- qmode = realqmode = FALSE;
- while ((c = *p++) != ' ')
- {
- /*
- ** If the buffer is overful, go into a special "skipping"
- ** mode that tries to keep legal syntax but doesn't actually
- ** output things.
- */
- skipping = bp >= buflim;
- if (copylev > 0 && !skipping)
- *bp++ = c;
- /* check for backslash escapes */
- if (c == '\')
- {
- /* arrange to quote the address */
- if (cmtlev <= 0 && !qmode)
- quoteit = TRUE;
- if ((c = *p++) == ' ')
- {
- /* too far */
- p--;
- goto putg;
- }
- if (copylev > 0 && !skipping)
- *bp++ = c;
- goto putg;
- }
- /* check for quoted strings */
- if (c == '"' && cmtlev <= 0)
- {
- qmode = !qmode;
- if (copylev > 0 && !skipping)
- realqmode = !realqmode;
- continue;
- }
- if (qmode)
- goto putg;
- /* check for comments */
- if (c == '(')
- {
- cmtlev++;
- /* allow space for closing paren */
- if (!skipping)
- {
- buflim--;
- realcmtlev++;
- if (copylev++ <= 0)
- {
- if (bp != bufhead)
- *bp++ = ' ';
- *bp++ = c;
- }
- }
- }
- if (cmtlev > 0)
- {
- if (c == ')')
- {
- cmtlev--;
- copylev--;
- if (!skipping)
- {
- realcmtlev--;
- buflim++;
- }
- }
- continue;
- }
- else if (c == ')')
- {
- /* syntax error: unmatched ) */
- if (copylev > 0 && !skipping)
- bp--;
- }
- /* count nesting on [ ... ] (for IPv6 domain literals) */
- if (c == '[')
- bracklev++;
- else if (c == ']')
- bracklev--;
- /* check for group: list; syntax */
- if (c == ':' && anglelev <= 0 && bracklev <= 0 &&
- !gotcolon && !ColonOkInAddr)
- {
- register char *q;
- /*
- ** Check for DECnet phase IV ``::'' (host::user)
- ** or ** DECnet phase V ``:.'' syntaxes. The latter
- ** covers ``user@DEC:.tay.myhost'' and
- ** ``DEC:.tay.myhost::user'' syntaxes (bletch).
- */
- if (*p == ':' || *p == '.')
- {
- if (cmtlev <= 0 && !qmode)
- quoteit = TRUE;
- if (copylev > 0 && !skipping)
- {
- *bp++ = c;
- *bp++ = *p;
- }
- p++;
- goto putg;
- }
- gotcolon = TRUE;
- bp = bufhead;
- if (quoteit)
- {
- *bp++ = '"';
- /* back up over the ':' and any spaces */
- --p;
- while (isascii(*--p) && isspace(*p))
- continue;
- p++;
- }
- for (q = addrhead; q < p; )
- {
- c = *q++;
- if (bp < buflim)
- {
- if (quoteit && c == '"')
- *bp++ = '\';
- *bp++ = c;
- }
- }
- if (quoteit)
- {
- if (bp == &bufhead[1])
- bp--;
- else
- *bp++ = '"';
- while ((c = *p++) != ':')
- {
- if (bp < buflim)
- *bp++ = c;
- }
- *bp++ = c;
- }
- /* any trailing white space is part of group: */
- while (isascii(*p) && isspace(*p) && bp < buflim)
- *bp++ = *p++;
- copylev = 0;
- putgmac = quoteit = FALSE;
- bufhead = bp;
- addrhead = p;
- continue;
- }
- if (c == ';' && copylev <= 0 && !ColonOkInAddr)
- {
- if (bp < buflim)
- *bp++ = c;
- }
- /* check for characters that may have to be quoted */
- if (strchr(MustQuoteChars, c) != NULL)
- {
- /*
- ** If these occur as the phrase part of a <>
- ** construct, but are not inside of () or already
- ** quoted, they will have to be quoted. Note that
- ** now (but don't actually do the quoting).
- */
- if (cmtlev <= 0 && !qmode)
- quoteit = TRUE;
- }
- /* check for angle brackets */
- if (c == '<')
- {
- register char *q;
- /* assume first of two angles is bogus */
- if (gotangle)
- quoteit = TRUE;
- gotangle = TRUE;
- /* oops -- have to change our mind */
- anglelev = 1;
- if (!skipping)
- realanglelev = 1;
- bp = bufhead;
- if (quoteit)
- {
- *bp++ = '"';
- /* back up over the '<' and any spaces */
- --p;
- while (isascii(*--p) && isspace(*p))
- continue;
- p++;
- }
- for (q = addrhead; q < p; )
- {
- c = *q++;
- if (bp < buflim)
- {
- if (quoteit && c == '"')
- *bp++ = '\';
- *bp++ = c;
- }
- }
- if (quoteit)
- {
- if (bp == &buf[1])
- bp--;
- else
- *bp++ = '"';
- while ((c = *p++) != '<')
- {
- if (bp < buflim)
- *bp++ = c;
- }
- *bp++ = c;
- }
- copylev = 0;
- putgmac = quoteit = FALSE;
- continue;
- }
- if (c == '>')
- {
- if (anglelev > 0)
- {
- anglelev--;
- if (!skipping)
- {
- realanglelev--;
- buflim++;
- }
- }
- else if (!skipping)
- {
- /* syntax error: unmatched > */
- if (copylev > 0)
- bp--;
- quoteit = TRUE;
- continue;
- }
- if (copylev++ <= 0)
- *bp++ = c;
- continue;
- }
- /* must be a real address character */
- putg:
- if (copylev <= 0 && !putgmac)
- {
- if (bp > bufhead && bp[-1] == ')')
- *bp++ = ' ';
- *bp++ = MACROEXPAND;
- *bp++ = 'g';
- putgmac = TRUE;
- }
- }
- /* repair any syntactic damage */
- if (realqmode)
- *bp++ = '"';
- while (realcmtlev-- > 0)
- *bp++ = ')';
- while (realanglelev-- > 0)
- *bp++ = '>';
- *bp++ = ' ';
- if (tTd(33, 1))
- {
- dprintf("crackaddr=>`");
- xputs(buf);
- dprintf("'n");
- }
- return buf;
- }
- /*
- ** PUTHEADER -- put the header part of a message from the in-core copy
- **
- ** Parameters:
- ** mci -- the connection information.
- ** hdr -- the header to put.
- ** e -- envelope to use.
- ** flags -- MIME conversion flags.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** none.
- */
- /*
- * Macro for fast max (not available in e.g. DG/UX, 386/ix).
- */
- #ifndef MAX
- # define MAX(a,b) (((a)>(b))?(a):(b))
- #endif /* ! MAX */
- void
- putheader(mci, hdr, e, flags)
- register MCI *mci;
- HDR *hdr;
- register ENVELOPE *e;
- int flags;
- {
- register HDR *h;
- char buf[MAX(MAXLINE,BUFSIZ)];
- char obuf[MAXLINE];
- if (tTd(34, 1))
- dprintf("--- putheader, mailer = %s ---n",
- mci->mci_mailer->m_name);
- /*
- ** If we're in MIME mode, we're not really in the header of the
- ** message, just the header of one of the parts of the body of
- ** the message. Therefore MCIF_INHEADER should not be turned on.
- */
- if (!bitset(MCIF_INMIME, mci->mci_flags))
- mci->mci_flags |= MCIF_INHEADER;
- for (h = hdr; h != NULL; h = h->h_link)
- {
- register char *p = h->h_value;
- if (tTd(34, 11))
- {
- dprintf(" %s: ", h->h_field);
- xputs(p);
- }
- /* heuristic shortening of MIME fields to avoid MUA overflows */
- if (MaxMimeFieldLength > 0 &&
- wordinclass(h->h_field,
- macid("{checkMIMEFieldHeaders}", NULL)))
- {
- if (fix_mime_header(h->h_value))
- {
- sm_syslog(LOG_ALERT, e->e_id,
- "Truncated MIME %s header due to field size (possible attack)",
- h->h_field);
- if (tTd(34, 11))
- dprintf(" truncated MIME %s header due to field size (possible attack)n",
- h->h_field);
- }
- }
- if (MaxMimeHeaderLength > 0 &&
- wordinclass(h->h_field,
- macid("{checkMIMETextHeaders}", NULL)))
- {
- if (strlen(h->h_value) > MaxMimeHeaderLength)
- {
- h->h_value[MaxMimeHeaderLength - 1] = ' ';
- sm_syslog(LOG_ALERT, e->e_id,
- "Truncated long MIME %s header (possible attack)",
- h->h_field);
- if (tTd(34, 11))
- dprintf(" truncated long MIME %s header (possible attack)n",
- h->h_field);
- }
- }
- if (MaxMimeHeaderLength > 0 &&
- wordinclass(h->h_field,
- macid("{checkMIMEHeaders}", NULL)))
- {
- if (shorten_rfc822_string(h->h_value, MaxMimeHeaderLength))
- {
- sm_syslog(LOG_ALERT, e->e_id,
- "Truncated long MIME %s header (possible attack)",
- h->h_field);
- if (tTd(34, 11))
- dprintf(" truncated long MIME %s header (possible attack)n",
- h->h_field);
- }
- }
- /*
- ** Suppress Content-Transfer-Encoding: if we are MIMEing
- ** and we are potentially converting from 8 bit to 7 bit
- ** MIME. If converting, add a new CTE header in
- ** mime8to7().
- */
- if (bitset(H_CTE, h->h_flags) &&
- bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME,
- mci->mci_flags) &&
- !bitset(M87F_NO8TO7, flags))
- {
- if (tTd(34, 11))
- dprintf(" (skipped (content-transfer-encoding))n");
- continue;
- }
- if (bitset(MCIF_INMIME, mci->mci_flags))
- {
- if (tTd(34, 11))
- dprintf("n");
- put_vanilla_header(h, p, mci);
- continue;
- }
- if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
- !bitintersect(h->h_mflags, mci->mci_mailer->m_flags) &&
- (h->h_macro == ' ' ||
- macvalue(h->h_macro & 0377, e) == NULL))
- {
- if (tTd(34, 11))
- dprintf(" (skipped)n");
- continue;
- }
- /* handle Resent-... headers specially */
- if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
- {
- if (tTd(34, 11))
- dprintf(" (skipped (resent))n");
- continue;
- }
- /* suppress return receipts if requested */
- if (bitset(H_RECEIPTTO, h->h_flags) &&
- (RrtImpliesDsn || bitset(EF_NORECEIPT, e->e_flags)))
- {
- if (tTd(34, 11))
- dprintf(" (skipped (receipt))n");
- continue;
- }
- /* macro expand value if generated internally */
- if (bitset(H_DEFAULT, h->h_flags) ||
- bitset(H_BINDLATE, h->h_flags))
- {
- expand(p, buf, sizeof buf, e);
- p = buf;
- if (*p == ' ')
- {
- if (tTd(34, 11))
- dprintf(" (skipped -- null value)n");
- continue;
- }
- }
- if (bitset(H_BCC, h->h_flags))
- {
- /* Bcc: field -- either truncate or delete */
- if (bitset(EF_DELETE_BCC, e->e_flags))
- {
- if (tTd(34, 11))
- dprintf(" (skipped -- bcc)n");
- }
- else
- {
- /* no other recipient headers: truncate value */
- (void) snprintf(obuf, sizeof obuf, "%s:",
- h->h_field);
- putline(obuf, mci);
- }
- continue;
- }
- if (tTd(34, 11))
- dprintf("n");
- if (bitset(H_FROM|H_RCPT, h->h_flags))
- {
- /* address field */
- bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags);
- if (bitset(H_FROM, h->h_flags))
- oldstyle = FALSE;
- commaize(h, p, oldstyle, mci, e);
- }
- else
- {
- put_vanilla_header(h, p, mci);
- }
- }
- /*
- ** If we are converting this to a MIME message, add the
- ** MIME headers (but not in MIME mode!).
- */
- #if MIME8TO7
- if (bitset(MM_MIME8BIT, MimeMode) &&
- bitset(EF_HAS8BIT, e->e_flags) &&
- !bitset(EF_DONT_MIME, e->e_flags) &&
- !bitnset(M_8BITS, mci->mci_mailer->m_flags) &&
- !bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME, mci->mci_flags) &&
- hvalue("MIME-Version", e->e_header) == NULL)
- {
- putline("MIME-Version: 1.0", mci);
- if (hvalue("Content-Type", e->e_header) == NULL)
- {
- snprintf(obuf, sizeof obuf,
- "Content-Type: text/plain; charset=%s",
- defcharset(e));
- putline(obuf, mci);
- }
- if (hvalue("Content-Transfer-Encoding", e->e_header) == NULL)
- putline("Content-Transfer-Encoding: 8bit", mci);
- }
- #endif /* MIME8TO7 */
- }
- /*
- ** PUT_VANILLA_HEADER -- output a fairly ordinary header
- **
- ** Parameters:
- ** h -- the structure describing this header
- ** v -- the value of this header
- ** mci -- the connection info for output
- **
- ** Returns:
- ** none.
- */
- static void
- put_vanilla_header(h, v, mci)
- HDR *h;
- char *v;
- MCI *mci;
- {
- register char *nlp;
- register char *obp;
- int putflags;
- char obuf[MAXLINE];
- putflags = PXLF_HEADER;
- if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
- putflags |= PXLF_STRIP8BIT;
- (void) snprintf(obuf, sizeof obuf, "%.200s: ", h->h_field);
- obp = obuf + strlen(obuf);
- while ((nlp = strchr(v, 'n')) != NULL)
- {
- int l;
- l = nlp - v;
- if (SPACELEFT(obuf, obp) - 1 < l)
- l = SPACELEFT(obuf, obp) - 1;
- snprintf(obp, SPACELEFT(obuf, obp), "%.*s", l, v);
- putxline(obuf, strlen(obuf), mci, putflags);
- v += l + 1;
- obp = obuf;
- if (*v != ' ' && *v != 't')
- *obp++ = ' ';
- }
- snprintf(obp, SPACELEFT(obuf, obp), "%.*s",
- (int) sizeof obuf - (obp - obuf) - 1, v);
- putxline(obuf, strlen(obuf), mci, putflags);
- }
- /*
- ** COMMAIZE -- output a header field, making a comma-translated list.
- **
- ** Parameters:
- ** h -- the header field to output.
- ** p -- the value to put in it.
- ** oldstyle -- TRUE if this is an old style header.
- ** mci -- the connection information.
- ** e -- the envelope containing the message.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** outputs "p" to file "fp".
- */
- void
- commaize(h, p, oldstyle, mci, e)
- register HDR *h;
- register char *p;
- bool oldstyle;
- register MCI *mci;
- register ENVELOPE *e;
- {
- register char *obp;
- int opos;
- int omax;
- bool firstone = TRUE;
- int putflags = PXLF_HEADER;
- char obuf[MAXLINE + 3];
- /*
- ** Output the address list translated by the
- ** mailer and with commas.
- */
- if (tTd(14, 2))
- dprintf("commaize(%s: %s)n", h->h_field, p);
- if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
- putflags |= PXLF_STRIP8BIT;
- obp = obuf;
- (void) snprintf(obp, SPACELEFT(obuf, obp), "%.200s: ", h->h_field);
- opos = strlen(h->h_field) + 2;
- if (opos > 202)
- opos = 202;
- obp += opos;
- omax = mci->mci_mailer->m_linelimit - 2;
- if (omax < 0 || omax > 78)
- omax = 78;
- /*
- ** Run through the list of values.
- */
- while (*p != ' ')
- {
- register char *name;
- register int c;
- char savechar;
- int flags;
- auto int status;
- /*
- ** Find the end of the name. New style names
- ** end with a comma, old style names end with
- ** a space character. However, spaces do not
- ** necessarily delimit an old-style name -- at
- ** signs mean keep going.
- */
- /* find end of name */
- while ((isascii(*p) && isspace(*p)) || *p == ',')
- p++;
- name = p;
- for (;;)
- {
- auto char *oldp;
- char pvpbuf[PSBUFSIZE];
- (void) prescan(p, oldstyle ? ' ' : ',', pvpbuf,
- sizeof pvpbuf, &oldp, NULL);
- p = oldp;
- /* look to see if we have an at sign */
- while (*p != ' ' && isascii(*p) && isspace(*p))
- p++;
- if (*p != '@')
- {
- p = oldp;
- break;
- }
- p += *p == '@' ? 1 : 2;
- while (*p != ' ' && isascii(*p) && isspace(*p))
- p++;
- }
- /* at the end of one complete name */
- /* strip off trailing white space */
- while (p >= name &&
- ((isascii(*p) && isspace(*p)) || *p == ',' || *p == ' '))
- p--;
- if (++p == name)
- continue;
- savechar = *p;
- *p = ' ';
- /* translate the name to be relative */
- flags = RF_HEADERADDR|RF_ADDDOMAIN;
- if (bitset(H_FROM, h->h_flags))
- flags |= RF_SENDERADDR;
- #if USERDB
- else if (e->e_from.q_mailer != NULL &&
- bitnset(M_UDBRECIPIENT, e->e_from.q_mailer->m_flags))
- {
- char *q;
- q = udbsender(name);
- if (q != NULL)
- name = q;
- }
- #endif /* USERDB */
- status = EX_OK;
- name = remotename(name, mci->mci_mailer, flags, &status, e);
- if (*name == ' ')
- {
- *p = savechar;
- continue;
- }
- name = denlstring(name, FALSE, TRUE);
- /*
- ** record data progress so DNS timeouts
- ** don't cause DATA timeouts
- */
- DataProgress = TRUE;
- /* output the name with nice formatting */
- opos += strlen(name);
- if (!firstone)
- opos += 2;
- if (opos > omax && !firstone)
- {
- snprintf(obp, SPACELEFT(obuf, obp), ",n");
- putxline(obuf, strlen(obuf), mci, putflags);
- obp = obuf;
- (void) strlcpy(obp, " ", sizeof obp);
- opos = strlen(obp);
- obp += opos;
- opos += strlen(name);
- }
- else if (!firstone)
- {
- snprintf(obp, SPACELEFT(obuf, obp), ", ");
- obp += 2;
- }
- while ((c = *name++) != ' ' && obp < &obuf[MAXLINE])
- *obp++ = c;
- firstone = FALSE;
- *p = savechar;
- }
- *obp = ' ';
- putxline(obuf, strlen(obuf), mci, putflags);
- }
- /*
- ** COPYHEADER -- copy header list
- **
- ** This routine is the equivalent of newstr for header lists
- **
- ** Parameters:
- ** header -- list of header structures to copy.
- **
- ** Returns:
- ** a copy of 'header'.
- **
- ** Side Effects:
- ** none.
- */
- HDR *
- copyheader(header)
- register HDR *header;
- {
- register HDR *newhdr;
- HDR *ret;
- register HDR **tail = &ret;
- while (header != NULL)
- {
- newhdr = (HDR *) xalloc(sizeof *newhdr);
- STRUCTCOPY(*header, *newhdr);
- *tail = newhdr;
- tail = &newhdr->h_link;
- header = header->h_link;
- }
- *tail = NULL;
- return ret;
- }
- /*
- ** FIX_MIME_HEADER -- possibly truncate/rebalance parameters in a MIME header
- **
- ** Run through all of the parameters of a MIME header and
- ** possibly truncate and rebalance the parameter according
- ** to MaxMimeFieldLength.
- **
- ** Parameters:
- ** string -- the full header
- **
- ** Returns:
- ** TRUE if the header was modified, FALSE otherwise
- **
- ** Side Effects:
- ** string modified in place
- */
- static bool
- fix_mime_header(string)
- char *string;
- {
- bool modified = FALSE;
- char *begin = string;
- char *end;
- if (string == NULL || *string == ' ')
- return FALSE;
- /* Split on each ';' */
- while ((end = find_character(begin, ';')) != NULL)
- {
- char save = *end;
- char *bp;
- *end = ' ';
- /* Shorten individual parameter */
- if (shorten_rfc822_string(begin, MaxMimeFieldLength))
- modified = TRUE;
- /* Collapse the possibly shortened string with rest */
- bp = begin + strlen(begin);
- if (bp != end)
- {
- char *ep = end;
- *end = save;
- end = bp;
- /* copy character by character due to overlap */
- while (*ep != ' ')
- *bp++ = *ep++;
- *bp = ' ';
- }
- else
- *end = save;
- if (*end == ' ')
- break;
- /* Move past ';' */
- begin = end + 1;
- }
- return modified;
- }