290 lines
7.0 KiB
C
290 lines
7.0 KiB
C
/* $NetBSD: head.c,v 1.24 2013/01/16 15:21:42 christos Exp $ */
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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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#include <sys/cdefs.h>
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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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#else
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__RCSID("$NetBSD: head.c,v 1.24 2013/01/16 15:21:42 christos Exp $");
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#endif
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#endif /* not lint */
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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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* 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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static int
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cmatch(const char *cp, const char *tp)
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{
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while (*cp && *tp)
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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 ':':
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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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case '+':
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if (*cp != '+' && *cp != '-')
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return 0;
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cp++;
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break;
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}
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if (*cp || *tp)
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return 0;
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return 1;
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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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/*
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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' An optional digit or space
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* ':' A colon
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* 'N' A new line
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* '+' A plus or minus sign
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*/
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static struct cmatch_data {
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size_t tlen;
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char const *tdata;
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} const cmatch_data[] = {
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#define TSZ(a) (sizeof(a) - 1), a
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{ TSZ("Aaa Aaa O0 00:00:00 0000") }, /* BSD ctype */
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{ TSZ("Aaa Aaa O0 00:00 0000") }, /* SysV ctype */
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{ TSZ("Aaa Aaa O0 00:00:00 AAA 0000") }, /* BSD tmztype */
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{ TSZ("Aaa Aaa O0 00:00 AAA 0000") }, /* SysV tmztype */
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/*
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* RFC 822-alike From_ lines do not conform to RFC 4155, but seem to
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* be used in the wild by UW-imap (MBX format plus)
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*/
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{ TSZ("Aaa Aaa O0 00:00:00 0000 +0000") }, /* RFC822, UT offset */
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/*
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* RFC 822 with zone spec:
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* 1. military,
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* 2. UT,
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* 3. north america time zone strings
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* note that 1. is strictly speaking not correct as some letters are
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* not used
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*/
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{ TSZ("Aaa Aaa O0 00:00:00 0000 A") },
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{ TSZ("Aaa Aaa O0 00:00:00 0000 AA") },
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{ TSZ("Aaa Aaa O0 00:00:00 0000 AAA") },
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{ 0, NULL },
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};
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static int
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isdate(const char date[])
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{
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static size_t cmatch_minlen = 0;
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struct cmatch_data const *cmdp;
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size_t dl = strlen(date);
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if (cmatch_minlen == 0)
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for (cmdp = cmatch_data; cmdp->tdata != NULL; ++cmdp)
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cmatch_minlen = MIN(cmatch_minlen, cmdp->tlen);
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if (dl < cmatch_minlen)
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return 0;
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for (cmdp = cmatch_data; cmdp->tdata != NULL; ++cmdp)
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if (dl == cmdp->tlen && cmatch(date, cmdp->tdata))
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return 1;
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return 0;
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}
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static void
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fail(const char linebuf[], const char reason[])
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{
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#ifndef FMT_PROG
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if (debug)
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(void)fprintf(stderr, "\"%s\"\nnot a header because %s\n",
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linebuf, reason);
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#endif
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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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static const char *
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nextword(const char *wp, char *wbuf)
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{
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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 (*wp && !is_WSP(*wp)) {
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*wbuf++ = *wp;
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if (*wp++ == '"') {
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while (*wp && *wp != '"')
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*wbuf++ = *wp++;
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if (*wp == '"')
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*wbuf++ = *wp++;
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}
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}
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*wbuf = '\0';
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wp = skip_WSP(wp);
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if (*wp == '\0')
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return NULL;
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return wp;
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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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static char *
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copyin(const char *src, char **space)
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{
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char *cp;
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char *begin;
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begin = cp = *space;
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while ((*cp++ = *src++) != '\0')
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continue;
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*space = cp;
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return begin;
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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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* XXX - line[], pbuf[], and word[] must be LINESIZE in length or
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* overflow can occur in nextword() or copyin().
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*/
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PUBLIC void
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parse(const char line[], struct headline *hl, char pbuf[])
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{
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const char *cp;
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char *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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cp = nextword(cp, word);
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if (*word)
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hl->l_from = copyin(word, &sp);
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if (cp != NULL && cp[0] == 't' && cp[1] == 't' && cp[2] == 'y') {
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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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* 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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PUBLIC int
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ishead(const char linebuf[])
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{
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const char *cp;
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struct headline hl;
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char parbuf[LINESIZE];
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cp = linebuf;
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if (*cp++ != 'F' || *cp++ != 'r' || *cp++ != 'o' || *cp++ != 'm' ||
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*cp++ != ' ')
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return 0;
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parse(linebuf, &hl, parbuf);
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if (hl.l_from == NULL || hl.l_date == NULL) {
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fail(linebuf, "No from or 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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