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/* $OpenBSD: rfc822.c,v 1.1 2014/10/12 18:54:31 gilles Exp $ */
/*
* Copyright (c) 2014 Gilles Chehade <gilles@poolp.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "rfc822.h"
static int
parse_addresses(struct rfc822_parser *rp, const char *buffer, size_t len)
{
const char *s;
char *wptr;
struct rfc822_address *ra;
s = buffer;
/* skip over whitespaces */
for (s = buffer; *s && isspace(*s); ++s, len--)
;
/* we should now pointing to the beginning of a recipient */
if (*s == '\0')
return 0;
ra = calloc(1, sizeof *ra);
if (ra == NULL)
return -1;
wptr = ra->name;
for (; len; s++, len--) {
if (*s == '(' && !rp->escape && !rp->quote)
rp->comment++;
if (*s == '"' && !rp->escape && !rp->comment)
rp->quote = !rp->quote;
if (!rp->comment && !rp->quote && !rp->escape) {
if (*s == '<' && rp->bracket)
return 0;
if (*s == '>' && !rp->bracket)
return 0;
if (*s == '<') {
wptr = ra->address;
rp->bracket++;
continue;
}
if (*s == '>') {
rp->bracket--;
continue;
}
if (*s == ',' || *s == ';')
break;
}
if (*s == ')' && !rp->escape && !rp->quote && rp->comment)
rp->comment--;
if (*s == '\\' && !rp->escape && !rp->comment && !rp->quote)
rp->escape = 1;
else
rp->escape = 0;
*wptr++ = *s;
}
/* no value, malformed header */
if (ra->name[0] == '\0' && ra->address[0] == '\0')
return 0;
/* no <>, use name as address */
if (ra->address[0] == '\0') {
memcpy(ra->address, ra->name, sizeof ra->address);
memset(ra->name, 0, sizeof ra->name);
}
/* strip first trailing whitespace from name */
wptr = &ra->name[0] + strlen(ra->name);
while (wptr != &ra->name[0]) {
if (*wptr && ! isspace(*wptr))
break;
*wptr-- = '\0';
}
TAILQ_INSERT_TAIL(&rp->addresses, ra, next);
/* do we have more to process ? */
for (; *s; ++s, --len)
if (*s == ',' || *s == ';')
break;
/* nope, we're done */
if (*s == '\0')
return 1;
/* there's more to come */
if (*s == ',' || *s == ';') {
s++;
len--;
}
if (len)
return parse_addresses(rp, s, len);
return 1;
}
void
rfc822_parser_init(struct rfc822_parser *rp)
{
memset(rp, 0, sizeof *rp);
TAILQ_INIT(&rp->addresses);
}
void
rfc822_parser_reset(struct rfc822_parser *rp)
{
struct rfc822_address *ra;
while ((ra = TAILQ_FIRST(&rp->addresses))) {
TAILQ_REMOVE(&rp->addresses, ra, next);
free(ra);
}
memset(rp, 0, sizeof *rp);
}
int
rfc822_parser_feed(struct rfc822_parser *rp, const char *line)
{
return parse_addresses(rp, line, strlen(line));
}
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