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278 lines
6.5 KiB
C
278 lines
6.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)head.c 8.2 (Berkeley) 4/20/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "rcv.h"
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#include "extern.h"
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/*
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* Mail -- a mail program
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*
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* Routines for processing and detecting headlines.
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*/
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/*
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* See if the passed line buffer is a mail header.
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* Return true if yes. Note the extreme pains to
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* accommodate all funny formats.
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*/
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int
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ishead(char linebuf[])
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{
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struct headline hl;
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char parbuf[BUFSIZ];
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if (strncmp(linebuf, "From ", 5) != 0)
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return (0);
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parse(linebuf, &hl, parbuf);
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if (hl.l_date == NULL) {
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fail(linebuf, "No date field");
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return (0);
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}
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if (!isdate(hl.l_date)) {
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fail(linebuf, "Date field not legal date");
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return (0);
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}
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/*
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* I guess we got it!
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*/
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return (1);
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}
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void
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fail(const char *linebuf __unused, const char *reason __unused)
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{
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/*
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if (value("debug") == NULL)
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return;
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fprintf(stderr, "\"%s\"\nnot a header because %s\n", linebuf, reason);
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*/
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}
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/*
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* Split a headline into its useful components.
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* Copy the line into dynamic string space, then set
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* pointers into the copied line in the passed headline
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* structure. Actually, it scans.
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*/
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void
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parse(char line[], struct headline *hl, char pbuf[])
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{
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char *cp, *sp;
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char word[LINESIZE];
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hl->l_from = NULL;
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hl->l_tty = NULL;
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hl->l_date = NULL;
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cp = line;
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sp = pbuf;
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/*
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* Skip over "From" first.
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*/
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cp = nextword(cp, word);
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/*
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* Check for missing return-path.
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*/
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if (isdate(cp)) {
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hl->l_date = copyin(cp, &sp);
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return;
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}
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cp = nextword(cp, word);
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if (strlen(word) > 0)
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hl->l_from = copyin(word, &sp);
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if (cp != NULL && strncmp(cp, "tty", 3) == 0) {
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cp = nextword(cp, word);
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hl->l_tty = copyin(word, &sp);
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}
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if (cp != NULL)
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hl->l_date = copyin(cp, &sp);
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}
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/*
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* Copy the string on the left into the string on the right
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* and bump the right (reference) string pointer by the length.
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* Thus, dynamically allocate space in the right string, copying
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* the left string into it.
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*/
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char *
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copyin(char *src, char **space)
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{
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char *cp, *top;
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top = cp = *space;
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while ((*cp++ = *src++) != '\0')
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;
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*space = cp;
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return (top);
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}
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/*
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* Test to see if the passed string is a ctime(3) generated
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* date string as documented in the manual. The template
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* below is used as the criterion of correctness.
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* Also, we check for a possible trailing time zone using
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* the tmztype template.
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*
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* If the mail file is created by Sys V (Solaris), there are
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* no seconds in the time. If the mail is created by another
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* program such as imapd, it might have timezone as
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* <-|+>nnnn (-0800 for instance) at the end.
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*/
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/*
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* 'A' An upper case char
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* 'a' A lower case char
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* ' ' A space
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* '0' A digit
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* 'O' A digit or space
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* 'p' A punctuation char
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* 'P' A punctuation char or space
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* ':' A colon
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* 'N' A new line
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*/
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static char *date_formats[] = {
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"Aaa Aaa O0 00:00:00 0000", /* Mon Jan 01 23:59:59 2001 */
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"Aaa Aaa O0 00:00:00 AAA 0000", /* Mon Jan 01 23:59:59 PST 2001 */
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"Aaa Aaa O0 00:00:00 0000 p0000", /* Mon Jan 01 23:59:59 2001 -0800 */
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"Aaa Aaa O0 00:00 0000", /* Mon Jan 01 23:59 2001 */
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"Aaa Aaa O0 00:00 AAA 0000", /* Mon Jan 01 23:59 PST 2001 */
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"Aaa Aaa O0 00:00 0000 p0000", /* Mon Jan 01 23:59 2001 -0800 */
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NULL
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};
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int
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isdate(char date[])
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{
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int i;
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for(i = 0; date_formats[i] != NULL; i++) {
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if (cmatch(date, date_formats[i]))
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return (1);
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}
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return (0);
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}
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/*
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* Match the given string (cp) against the given template (tp).
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* Return 1 if they match, 0 if they don't
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*/
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int
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cmatch(char *cp, char *tp)
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{
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while (*cp != '\0' && *tp != '\0')
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switch (*tp++) {
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case 'a':
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if (!islower((unsigned char)*cp++))
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return (0);
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break;
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case 'A':
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if (!isupper((unsigned char)*cp++))
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return (0);
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break;
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case ' ':
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if (*cp++ != ' ')
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return (0);
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break;
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case '0':
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if (!isdigit((unsigned char)*cp++))
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return (0);
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break;
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case 'O':
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if (*cp != ' ' && !isdigit((unsigned char)*cp))
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return (0);
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cp++;
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break;
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case 'p':
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if (!ispunct((unsigned char)*cp++))
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return (0);
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break;
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case 'P':
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if (*cp != ' ' && !ispunct((unsigned char)*cp))
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return (0);
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cp++;
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break;
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case ':':
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if (*cp++ != ':')
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return (0);
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break;
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case 'N':
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if (*cp++ != '\n')
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return (0);
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break;
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}
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if (*cp != '\0' || *tp != '\0')
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return (0);
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return (1);
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}
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/*
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* Collect a liberal (space, tab delimited) word into the word buffer
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* passed. Also, return a pointer to the next word following that,
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* or NULL if none follow.
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*/
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char *
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nextword(char *wp, char *wbuf)
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{
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int c;
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if (wp == NULL) {
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*wbuf = '\0';
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return (NULL);
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}
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while ((c = *wp++) != '\0' && c != ' ' && c != '\t') {
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*wbuf++ = c;
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if (c == '"') {
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while ((c = *wp++) != '\0' && c != '"')
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*wbuf++ = c;
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if (c == '"')
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*wbuf++ = c;
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else
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wp--;
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}
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}
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*wbuf = '\0';
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for (; c == ' ' || c == '\t'; c = *wp++)
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;
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if (c == '\0')
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return (NULL);
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return (wp - 1);
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}
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