4.4BSD/usr/src/usr.sbin/sendmail/src/headers.c
/*
* 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[] = "@(#)headers.c 8.1 (Berkeley) 6/7/93";
#endif /* not lint */
# include <errno.h>
# include "sendmail.h"
/*
** CHOMPHEADER -- process and save a header line.
**
** Called by collect and by readcf to deal with header lines.
**
** Parameters:
** line -- header as a text line.
** def -- if set, this is a default value.
** 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.
*/
chompheader(line, def, e)
char *line;
bool def;
register ENVELOPE *e;
{
register char *p;
register HDR *h;
HDR **hp;
char *fname;
char *fvalue;
struct hdrinfo *hi;
bool cond = FALSE;
BITMAP mopts;
if (tTd(31, 6))
printf("chompheader: %s\n", line);
/* strip off options */
clrbitmap(mopts);
p = line;
if (*p == '?')
{
/* have some */
register char *q = strchr(p + 1, *p);
if (q != NULL)
{
*q++ = '\0';
while (*++p != '\0')
setbitn(*p, mopts);
p = q;
}
else
usrerr("553 header syntax error, line \"%s\"", line);
cond = TRUE;
}
/* find canonical name */
fname = p;
p = strchr(p, ':');
if (p == NULL)
{
syserr("553 header syntax error, line \"%s\"", line);
return (0);
}
fvalue = &p[1];
while (isascii(*--p) && isspace(*p))
continue;
*++p = '\0';
/* strip field value on front */
if (*fvalue == ' ')
fvalue++;
/* see if it is a known type */
for (hi = HdrInfo; hi->hi_field != NULL; hi++)
{
if (strcasecmp(hi->hi_field, fname) == 0)
break;
}
/* see if this is a resent message */
if (!def && bitset(H_RESENT, hi->hi_flags))
e->e_flags |= EF_RESENT;
/* if this means "end of header" quit now */
if (bitset(H_EOH, hi->hi_flags))
return (hi->hi_flags);
/* drop explicit From: if same as what we would generate -- for MH */
p = "resent-from";
if (!bitset(EF_RESENT, e->e_flags))
p += 7;
if (!def && !bitset(EF_QUEUERUN, e->e_flags) && strcasecmp(fname, p) == 0)
{
if (e->e_from.q_paddr != NULL &&
strcmp(fvalue, e->e_from.q_paddr) == 0)
return (hi->hi_flags);
}
/* delete default value for this header */
for (hp = &e->e_header; (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))
h->h_value = NULL;
}
/* create a new node */
h = (HDR *) xalloc(sizeof *h);
h->h_field = newstr(fname);
h->h_value = NULL;
h->h_link = NULL;
bcopy((char *) mopts, (char *) h->h_mflags, sizeof mopts);
*hp = h;
h->h_flags = hi->hi_flags;
if (def)
h->h_flags |= H_DEFAULT;
if (cond)
h->h_flags |= H_CHECK;
if (h->h_value != NULL)
free((char *) h->h_value);
h->h_value = newstr(fvalue);
/* hack to see if this is a new format message */
if (!def && 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.
** e -- the envelope to add them to.
**
** Returns:
** none.
**
** Side Effects:
** adds the field on the list of headers for this envelope.
*/
addheader(field, value, e)
char *field;
char *value;
ENVELOPE *e;
{
register HDR *h;
register struct hdrinfo *hi;
HDR **hp;
/* find info struct */
for (hi = HdrInfo; hi->hi_field != NULL; hi++)
{
if (strcasecmp(field, hi->hi_field) == 0)
break;
}
/* find current place in list -- keep back pointer? */
for (hp = &e->e_header; (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 = hi->hi_flags | H_DEFAULT;
clrbitmap(h->h_mflags);
*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.
** e -- the envelope containing the header.
**
** Returns:
** pointer to the value part.
** NULL if not found.
**
** Side Effects:
** none.
*/
char *
hvalue(field, e)
char *field;
register ENVELOPE *e;
{
register HDR *h;
for (h = e->e_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.
**
** Parameters:
** s -- string to check for possible headerness.
**
** Returns:
** TRUE if s is a header.
** FALSE otherwise.
**
** Side Effects:
** none.
*/
bool
isheader(s)
register char *s;
{
while (*s > ' ' && *s != ':' && *s != '\0')
s++;
/* 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).
**
** 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.
*/
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 (tTd(32, 1))
printf("----- collected header -----\n");
msgid = "<none>";
for (h = e->e_header; h != NULL; h = h->h_link)
{
/* do early binding */
if (bitset(H_DEFAULT, h->h_flags) && h->h_value != NULL)
{
expand(h->h_value, buf, &buf[sizeof buf], e);
if (buf[0] != '\0')
{
h->h_value = newstr(buf);
h->h_flags &= ~H_DEFAULT;
}
}
if (tTd(32, 1))
printf("%s: %s\n", h->h_field, h->h_value);
/* 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)))
{
(void) sendtolist(h->h_value, (ADDRESS *) NULL,
&e->e_sendqueue, e);
}
/* save the message-id for logging */
if (full && h->h_value != NULL &&
strcasecmp(h->h_field, "message-id") == 0)
{
msgid = h->h_value;
while (isascii(*msgid) && isspace(*msgid))
msgid++;
}
/* see if this is a return-receipt header */
if (bitset(H_RECEIPTTO, h->h_flags))
e->e_receiptto = h->h_value;
/* see if this is an errors-to header */
if (UseErrorsTo && bitset(H_ERRORSTO, h->h_flags))
(void) sendtolist(h->h_value, (ADDRESS *) NULL,
&e->e_errorqueue, e);
}
if (tTd(32, 1))
printf("----------------------------\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);
if (p != NULL)
e->e_class = priencode(p);
if (full)
e->e_msgpriority = e->e_msgsize
- e->e_class * WkClassFact
+ e->e_nrcpts * WkRecipFact;
/* full name of from person */
p = hvalue("full-name", e);
if (p != NULL)
define('x', p, e);
/* date message originated */
p = hvalue("posted-date", e);
if (p == NULL)
p = hvalue("date", e);
if (p != NULL)
define('a', p, e);
/*
** Log collection information.
*/
# ifdef LOG
if (full && LogLevel > 4)
{
char *name;
register char *sbp;
char hbuf[MAXNAME];
char sbuf[MAXLINE];
if (bitset(EF_RESPONSE, e->e_flags))
name = "[RESPONSE]";
else if ((name = macvalue('_', e)) != NULL)
;
else if (RealHostName[0] == '[')
name = RealHostName;
else
{
name = hbuf;
(void) sprintf(hbuf, "%.80s", RealHostName);
if (RealHostAddr.sa.sa_family != 0)
{
p = &hbuf[strlen(hbuf)];
(void) sprintf(p, " (%s)",
anynet_ntoa(&RealHostAddr));
}
}
/* some versions of syslog only take 5 printf args */
sbp = sbuf;
sprintf(sbp, "from=%.200s, size=%ld, class=%d, pri=%ld, nrcpts=%d, msgid=%.100s",
e->e_from.q_paddr, e->e_msgsize, e->e_class,
e->e_msgpriority, e->e_nrcpts, msgid);
sbp += strlen(sbp);
if (e->e_bodytype != NULL)
{
(void) sprintf(sbp, ", bodytype=%.20s", e->e_bodytype);
sbp += strlen(sbp);
}
p = macvalue('r', e);
if (p != NULL)
(void) sprintf(sbp, ", proto=%.20s", p);
syslog(LOG_INFO, "%s: %s, relay=%s",
e->e_id, sbuf, name);
}
# endif /* LOG */
}
/*
** PRIENCODE -- encode external priority names into internal values.
**
** Parameters:
** p -- priority in ascii.
**
** Returns:
** priority as a numeric level.
**
** Side Effects:
** none.
*/
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;
bool qmode;
bool realqmode;
bool skipping;
bool putgmac = FALSE;
bool quoteit = FALSE;
register char *bp;
char *buflim;
static char buf[MAXNAME];
if (tTd(33, 1))
printf("crackaddr(%s)\n", addr);
/* strip leading spaces */
while (*addr != '\0' && isascii(*addr) && isspace(*addr))
addr++;
/*
** Start by assuming we have no angle brackets. This will be
** adjusted later if we find them.
*/
bp = buf;
buflim = &buf[sizeof buf - 5];
p = addr;
copylev = anglelev = realanglelev = cmtlev = realcmtlev = 0;
qmode = realqmode = FALSE;
while ((c = *p++) != '\0')
{
/*
** 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++) == '\0')
{
/* too far */
p--;
goto putg;
}
if (copylev > 0 && !skipping)
*bp++ = c;
goto putg;
}
/* check for quoted strings */
if (c == '"')
{
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)
{
*bp++ = ' ';
*bp++ = c;
}
}
}
if (cmtlev > 0)
{
if (c == ')')
{
cmtlev--;
copylev--;
if (!skipping)
{
realcmtlev--;
buflim++;
}
}
continue;
}
else if (c == ')')
{
/* syntax error: unmatched ) */
if (!skipping)
bp--;
}
/* check for characters that may have to be quoted */
if (strchr(".'@,;:\\()", 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;
/* oops -- have to change our mind */
anglelev++;
if (!skipping)
realanglelev++;
bp = buf;
if (quoteit)
{
*bp++ = '"';
/* back up over the '<' and any spaces */
--p;
while (isascii(*--p) && isspace(*p))
continue;
p++;
}
for (q = addr; q < p; )
{
c = *q++;
if (bp < buflim)
{
if (quoteit && c == '"')
*bp++ = '\\';
*bp++ = c;
}
}
if (quoteit)
{
*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--;
continue;
}
if (copylev++ <= 0)
*bp++ = c;
continue;
}
/* must be a real address character */
putg:
if (copylev <= 0 && !putgmac)
{
*bp++ = MACROEXPAND;
*bp++ = 'g';
putgmac = TRUE;
}
}
/* repair any syntactic damage */
if (realqmode)
*bp++ = '"';
while (realcmtlev-- > 0)
*bp++ = ')';
while (realanglelev-- > 0)
*bp++ = '>';
*bp++ = '\0';
if (tTd(33, 1))
printf("crackaddr=>`%s'\n", buf);
return (buf);
}
/*
** PUTHEADER -- put the header part of a message from the in-core copy
**
** Parameters:
** fp -- file to put it on.
** m -- mailer to use.
** e -- envelope to use.
**
** 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
putheader(fp, m, e)
register FILE *fp;
register MAILER *m;
register ENVELOPE *e;
{
char buf[MAX(MAXLINE,BUFSIZ)];
register HDR *h;
char obuf[MAXLINE];
if (tTd(34, 1))
printf("--- putheader, mailer = %s ---\n", m->m_name);
for (h = e->e_header; h != NULL; h = h->h_link)
{
register char *p;
extern bool bitintersect();
if (tTd(34, 11))
{
printf(" %s: ", h->h_field);
xputs(h->h_value);
}
if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
!bitintersect(h->h_mflags, m->m_flags))
{
if (tTd(34, 11))
printf(" (skipped)\n");
continue;
}
/* handle Resent-... headers specially */
if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
{
if (tTd(34, 11))
printf(" (skipped (resent))\n");
continue;
}
if (tTd(34, 11))
printf("\n");
p = h->h_value;
if (bitset(H_DEFAULT, h->h_flags))
{
/* macro expand value if generated internally */
expand(p, buf, &buf[sizeof buf], e);
p = buf;
if (p == NULL || *p == '\0')
continue;
}
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, fp, oldstyle, m, e);
}
else
{
/* vanilla header line */
register char *nlp;
(void) sprintf(obuf, "%s: ", h->h_field);
while ((nlp = strchr(p, '\n')) != NULL)
{
*nlp = '\0';
(void) strcat(obuf, p);
*nlp = '\n';
putline(obuf, fp, m);
p = ++nlp;
obuf[0] = '\0';
}
(void) strcat(obuf, p);
putline(obuf, fp, m);
}
}
}
/*
** COMMAIZE -- output a header field, making a comma-translated list.
**
** Parameters:
** h -- the header field to output.
** p -- the value to put in it.
** fp -- file to put it to.
** oldstyle -- TRUE if this is an old style header.
** m -- a pointer to the mailer descriptor. If NULL,
** don't transform the name at all.
** e -- the envelope containing the message.
**
** Returns:
** none.
**
** Side Effects:
** outputs "p" to file "fp".
*/
commaize(h, p, fp, oldstyle, m, e)
register HDR *h;
register char *p;
FILE *fp;
bool oldstyle;
register MAILER *m;
register ENVELOPE *e;
{
register char *obp;
int opos;
bool firstone = TRUE;
char obuf[MAXLINE + 3];
/*
** Output the address list translated by the
** mailer and with commas.
*/
if (tTd(14, 2))
printf("commaize(%s: %s)\n", h->h_field, p);
obp = obuf;
(void) sprintf(obp, "%s: ", h->h_field);
opos = strlen(h->h_field) + 2;
obp += opos;
/*
** Run through the list of values.
*/
while (*p != '\0')
{
register char *name;
register int c;
char savechar;
int flags;
auto int stat;
/*
** 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, &oldp);
p = oldp;
/* look to see if we have an at sign */
while (*p != '\0' && isascii(*p) && isspace(*p))
p++;
if (*p != '@')
{
p = oldp;
break;
}
p += *p == '@' ? 1 : 2;
while (*p != '\0' && 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 == '\0'))
p--;
if (++p == name)
continue;
savechar = *p;
*p = '\0';
/* translate the name to be relative */
flags = RF_HEADERADDR|RF_ADDDOMAIN;
if (bitset(H_FROM, h->h_flags))
flags |= RF_SENDERADDR;
stat = EX_OK;
name = remotename(name, m, flags, &stat, e);
if (*name == '\0')
{
*p = savechar;
continue;
}
/* output the name with nice formatting */
opos += strlen(name);
if (!firstone)
opos += 2;
if (opos > 78 && !firstone)
{
(void) strcpy(obp, ",\n");
putline(obuf, fp, m);
obp = obuf;
(void) sprintf(obp, " ");
opos = strlen(obp);
obp += opos;
opos += strlen(name);
}
else if (!firstone)
{
(void) sprintf(obp, ", ");
obp += 2;
}
while ((c = *name++) != '\0' && obp < &obuf[MAXLINE])
*obp++ = c;
firstone = FALSE;
*p = savechar;
}
(void) strcpy(obp, "\n");
putline(obuf, fp, m);
}
/*
** 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(HDR));
STRUCTCOPY(*header, *newhdr);
*tail = newhdr;
tail = &newhdr->h_link;
header = header->h_link;
}
*tail = NULL;
return ret;
}