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- /*
- * Copyright (c) 1983 Eric P. Allman
- * Copyright (c) 1988 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 5.15 (Berkeley) 6/1/90";
- #endif /* not lint */
-
- # include <sys/param.h>
- # 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.
- **
- ** Returns:
- ** flags for this header.
- **
- ** Side Effects:
- ** The header is saved on the header list.
- ** Contents of 'line' are destroyed.
- */
-
- chompheader(line, def)
- char *line;
- bool def;
- {
- register char *p;
- register HDR *h;
- HDR **hp;
- char *fname;
- char *fvalue;
- struct hdrinfo *hi;
- bool cond = FALSE;
- BITMAP mopts;
- extern char *crackaddr();
-
- if (tTd(31, 6))
- printf("chompheader: %s\n", line);
-
- /* strip off options */
- clrbitmap(mopts);
- p = line;
- if (*p == '?')
- {
- /* have some */
- register char *q = index(p + 1, *p);
-
- if (q != NULL)
- {
- *q++ = '\0';
- while (*++p != '\0')
- setbitn(*p, mopts);
- p = q;
- }
- else
- usrerr("chompheader: syntax error, line \"%s\"", line);
- cond = TRUE;
- }
-
- /* find canonical name */
- fname = p;
- p = index(p, ':');
- if (p == NULL)
- {
- syserr("chompheader: syntax error, line \"%s\"", line);
- return (0);
- }
- fvalue = &p[1];
- while (isspace(*--p))
- continue;
- *++p = '\0';
- makelower(fname);
-
- /* strip field value on front */
- if (*fvalue == ' ')
- fvalue++;
-
- /* see if it is a known type */
- for (hi = HdrInfo; hi->hi_field != NULL; hi++)
- {
- if (strcmp(hi->hi_field, fname) == 0)
- break;
- }
-
- /* see if this is a resent message */
- if (!def && bitset(H_RESENT, hi->hi_flags))
- CurEnv->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, CurEnv->e_flags))
- p += 7;
- if (!def && !QueueRun && strcmp(fname, p) == 0)
- {
- if (CurEnv->e_from.q_paddr != NULL &&
- strcmp(fvalue, CurEnv->e_from.q_paddr) == 0)
- return (hi->hi_flags);
- }
-
- /* delete default value for this header */
- for (hp = &CurEnv->e_header; (h = *hp) != NULL; hp = &h->h_link)
- {
- if (strcmp(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) &&
- (index(fvalue, ',') != NULL || index(fvalue, '(') != NULL ||
- index(fvalue, '<') != NULL || index(fvalue, ';') != NULL))
- {
- CurEnv->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. It must be lower-cased.
- ** 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 (strcmp(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 (strcmp(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.
- **
- ** Returns:
- ** pointer to the value part.
- ** NULL if not found.
- **
- ** Side Effects:
- ** none.
- */
-
- char *
- hvalue(field)
- char *field;
- {
- register HDR *h;
-
- for (h = CurEnv->e_header; h != NULL; h = h->h_link)
- {
- if (!bitset(H_DEFAULT, h->h_flags) && strcmp(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 (isspace(*s))
- s++;
-
- return (*s == ':');
- }
- /*
- ** EATHEADER -- run through the stored header and extract info.
- **
- ** Parameters:
- ** e -- the envelope to process.
- **
- ** 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)
- register ENVELOPE *e;
- {
- register HDR *h;
- register char *p;
- int hopcnt = 0;
-
- if (tTd(32, 1))
- printf("----- collected header -----\n");
- for (h = e->e_header; h != NULL; h = h->h_link)
- {
- extern char *capitalize();
-
- if (tTd(32, 1))
- printf("%s: %s\n", capitalize(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, CurEnv->e_flags) || bitset(H_RESENT, h->h_flags)))
- {
- sendtolist(h->h_value, (ADDRESS *) NULL, &CurEnv->e_sendqueue);
- }
-
- /* log the message-id */
- #ifdef LOG
- if (!QueueRun && LogLevel > 8 && h->h_value != NULL &&
- strcmp(h->h_field, "message-id") == 0)
- {
- char buf[MAXNAME];
-
- p = h->h_value;
- if (bitset(H_DEFAULT, h->h_flags))
- {
- expand(p, buf, &buf[sizeof buf], e);
- p = buf;
- }
- syslog(LOG_INFO, "%s: message-id=%s", e->e_id, p);
- }
- #endif LOG
- }
- if (tTd(32, 1))
- printf("----------------------------\n");
-
- /* store hop count */
- if (hopcnt > e->e_hopcount)
- e->e_hopcount = hopcnt;
-
- /* message priority */
- p = hvalue("precedence");
- if (p != NULL)
- e->e_class = priencode(p);
- if (!QueueRun)
- e->e_msgpriority = e->e_msgsize
- - e->e_class * WkClassFact
- + e->e_nrcpts * WkRecipFact;
-
- /* return receipt to */
- p = hvalue("return-receipt-to");
- if (p != NULL)
- e->e_receiptto = p;
-
- /* errors to */
- p = hvalue("errors-to");
- if (p != NULL)
- sendtolist(p, (ADDRESS *) NULL, &e->e_errorqueue);
-
- /* from person */
- if (OpMode == MD_ARPAFTP)
- {
- register struct hdrinfo *hi = HdrInfo;
-
- for (p = NULL; p == NULL && hi->hi_field != NULL; hi++)
- {
- if (bitset(H_FROM, hi->hi_flags))
- p = hvalue(hi->hi_field);
- }
- if (p != NULL)
- setsender(p);
- }
-
- /* full name of from person */
- p = hvalue("full-name");
- if (p != NULL)
- define('x', p, e);
-
- /* date message originated */
- p = hvalue("posted-date");
- if (p == NULL)
- p = hvalue("date");
- if (p != NULL)
- {
- define('a', p, e);
- /* we don't have a good way to do canonical conversion ....
- define('d', newstr(arpatounix(p)), e);
- .... so we will ignore the problem for the time being */
- }
-
- /*
- ** Log collection information.
- */
-
- # ifdef LOG
- if (!QueueRun && LogLevel > 1)
- {
- char hbuf[100], *name = hbuf;
-
- if (RealHostName == NULL)
- name = "local";
- else if (RealHostName[0] == '[')
- name = RealHostName;
- else
- (void)sprintf(hbuf, "%.90s (%s)",
- RealHostName, inet_ntoa(RealHostAddr.sin_addr));
- syslog(LOG_INFO,
- "%s: from=%s, size=%ld, class=%d, received from %s\n",
- CurEnv->e_id, CurEnv->e_from.q_paddr, CurEnv->e_msgsize,
- CurEnv->e_class, 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 "$g". The parse is totally ad hoc
- ** and isn't even guaranteed to leave something syntactically
- ** identical to what it started with. However, it does leave
- ** something semantically identical.
- **
- ** The process is kind of strange. There are a number of
- ** interesting cases:
- ** 1. comment <address> comment ==> comment <$g> comment
- ** 2. address ==> address
- ** 3. address (comment) ==> $g (comment)
- ** 4. (comment) address ==> (comment) $g
- ** And then there are the hard cases....
- ** 5. add (comment) ress ==> $g (comment)
- ** 6. comment <address (comment)> ==> comment <$g (comment)>
- ** 7. .... etc ....
- **
- ** 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 int i;
- static char buf[MAXNAME];
- char *rhs;
- bool gotaddr;
- register char *bp;
-
- if (tTd(33, 1))
- printf("crackaddr(%s)\n", addr);
-
- (void) strcpy(buf, "");
- rhs = NULL;
-
- /* strip leading spaces */
- while (*addr != '\0' && isspace(*addr))
- addr++;
-
- /*
- ** See if we have anything in angle brackets. If so, that is
- ** the address part, and the rest is the comment.
- */
-
- p = index(addr, '<');
- if (p != NULL)
- {
- /* copy the beginning of the addr field to the buffer */
- *p = '\0';
- (void) strcpy(buf, addr);
- (void) strcat(buf, "<");
- *p++ = '<';
-
- /* skip spaces */
- while (isspace(*p))
- p++;
-
- /* find the matching right angle bracket */
- addr = p;
- for (i = 0; *p != '\0'; p++)
- {
- switch (*p)
- {
- case '<':
- i++;
- break;
-
- case '>':
- i--;
- break;
- }
- if (i < 0)
- break;
- }
-
- /* p now points to the closing quote (or a null byte) */
- if (*p != '\0')
- {
- /* make rhs point to the extra stuff at the end */
- rhs = p;
- *p++ = '\0';
- }
- }
-
- /*
- ** Now parse the real address part. "addr" points to the (null
- ** terminated) version of what we are inerested in; rhs points
- ** to the extra stuff at the end of the line, if any.
- */
-
- p = addr;
-
- /* now strip out comments */
- bp = &buf[strlen(buf)];
- gotaddr = FALSE;
- for (; *p != '\0'; p++)
- {
- if (*p == '(')
- {
- /* copy to matching close paren */
- *bp++ = *p++;
- for (i = 0; *p != '\0'; p++)
- {
- *bp++ = *p;
- switch (*p)
- {
- case '(':
- i++;
- break;
-
- case ')':
- i--;
- break;
- }
- if (i < 0)
- break;
- }
- continue;
- }
-
- /*
- ** If this is the first "real" character we have seen,
- ** then we put the "$g" in the buffer now.
- */
-
- if (isspace(*p))
- *bp++ = *p;
- else if (!gotaddr)
- {
- (void) strcpy(bp, "\001g");
- bp += 2;
- gotaddr = TRUE;
- }
- }
-
- /* hack, hack.... strip trailing blanks */
- do
- {
- *bp-- = '\0';
- } while (isspace(*bp));
- bp++;
-
- /* put any right hand side back on */
- if (rhs != NULL)
- {
- *rhs = '>';
- (void) strcpy(bp, rhs);
- }
-
- 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.
- */
-
- putheader(fp, m, e)
- register FILE *fp;
- register MAILER *m;
- register ENVELOPE *e;
- {
- char buf[MAX(MAXFIELD,BUFSIZ)];
- register HDR *h;
- extern char *arpadate();
- extern char *capitalize();
- char obuf[MAX(MAXFIELD,MAXLINE)];
-
- for (h = e->e_header; h != NULL; h = h->h_link)
- {
- register char *p;
- extern bool bitintersect();
-
- if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
- !bitintersect(h->h_mflags, m->m_flags))
- continue;
-
- /* handle Resent-... headers specially */
- if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
- continue;
-
- 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);
- }
- else
- {
- /* vanilla header line */
- register char *nlp;
-
- (void) sprintf(obuf, "%s: ", capitalize(h->h_field));
- while ((nlp = index(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.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** outputs "p" to file "fp".
- */
-
- commaize(h, p, fp, oldstyle, m)
- register HDR *h;
- register char *p;
- FILE *fp;
- bool oldstyle;
- register MAILER *m;
- {
- 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: ", capitalize(h->h_field));
- opos = strlen(h->h_field) + 2;
- obp += opos;
-
- /*
- ** Run through the list of values.
- */
-
- while (*p != '\0')
- {
- register char *name;
- char savechar;
- extern char *remotename();
- extern char *DelimChar; /* defined in prescan */
-
- /*
- ** 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 (isspace(*p) || *p == ',')
- p++;
- name = p;
- for (;;)
- {
- char *oldp;
- char pvpbuf[PSBUFSIZE];
- extern bool isatword();
- extern char **prescan();
-
- (void) prescan(p, oldstyle ? ' ' : ',', pvpbuf);
- p = DelimChar;
-
- /* look to see if we have an at sign */
- oldp = p;
- while (*p != '\0' && isspace(*p))
- p++;
-
- if (*p != '@' && !isatword(p))
- {
- p = oldp;
- break;
- }
- p += *p == '@' ? 1 : 2;
- while (*p != '\0' && isspace(*p))
- p++;
- }
- /* at the end of one complete name */
-
- /* strip off trailing white space */
- while (p >= name && (isspace(*p) || *p == ',' || *p == '\0'))
- p--;
- if (++p == name)
- continue;
- savechar = *p;
- *p = '\0';
-
- /* translate the name to be relative */
- name = remotename(name, m, bitset(H_FROM, h->h_flags), FALSE);
- if (*name == '\0')
- {
- *p = savechar;
- continue;
- }
-
- /* output the name with nice formatting */
- opos += qstrlen(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 += qstrlen(name);
- }
- else if (!firstone)
- {
- (void) sprintf(obp, ", ");
- obp += 2;
- }
-
- /* strip off quote bits as we output */
- while (*name != '\0' && obp < &obuf[MAXLINE])
- {
- if (bitset(0200, *name))
- *obp++ = '\\';
- *obp++ = *name++ & ~0200;
- }
- firstone = FALSE;
- *p = savechar;
- }
- (void) strcpy(obp, "\n");
- putline(obuf, fp, m);
- }
- /*
- ** ISATWORD -- tell if the word we are pointing to is "at".
- **
- ** Parameters:
- ** p -- word to check.
- **
- ** Returns:
- ** TRUE -- if p is the word at.
- ** FALSE -- otherwise.
- **
- ** Side Effects:
- ** none.
- */
-
- bool
- isatword(p)
- register char *p;
- {
- extern char lower();
-
- if (lower(p[0]) == 'a' && lower(p[1]) == 't' &&
- p[2] != '\0' && isspace(p[2]))
- return (TRUE);
- return (FALSE);
- }
-