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/* $OpenBSD: rfc2822.c,v 1.3 2014/11/23 21:27:53 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 "rfc2822.h"
/* default no-op callbacks */
static void hdr_dflt_cb(const struct rfc2822_header *hdr, void *arg) {}
static void body_dflt_cb(const char *line, void *arg) {}
static void
header_reset(struct rfc2822_header *hdr)
{
struct rfc2822_line *line;
while ((line = TAILQ_FIRST(&hdr->lines))) {
TAILQ_REMOVE(&hdr->lines, line, next);
free(line);
}
}
static void
header_callback(struct rfc2822_parser *rp)
{
struct rfc2822_hdr_cb *hdr_cb;
TAILQ_FOREACH(hdr_cb, &rp->hdr_cb, next)
if (strcasecmp(hdr_cb->name, rp->header.name) == 0) {
hdr_cb->func(&rp->header, hdr_cb->arg);
header_reset(&rp->header);
rp->in_hdr = 0;
return;
}
rp->hdr_dflt_cb.func(&rp->header, rp->hdr_dflt_cb.arg);
header_reset(&rp->header);
rp->in_hdr = 0;
return;
}
static void
body_callback(struct rfc2822_parser *rp, const char *line)
{
rp->body_line_cb.func(line, rp->body_line_cb.arg);
}
static int
parser_feed_header(struct rfc2822_parser *rp, char *line)
{
struct rfc2822_line *hdrline;
char *pos;
/* new header */
if (! isspace(*line) && *line != '\0') {
rp->in_hdr = 1;
if ((pos = strchr(line, ':')) == NULL)
return 0;
memset(rp->header.name, 0, sizeof rp->header.name);
(void)memcpy(rp->header.name, line, pos - line);
if (isspace(*(pos + 1)))
return parser_feed_header(rp, pos + 1);
else {
*pos = ' ';
return parser_feed_header(rp, pos);
}
}
/* continuation */
if (! rp->in_hdr)
return 0;
/* append line to header */
if ((hdrline = calloc(1, sizeof *hdrline)) == NULL)
return -1;
(void)strlcpy(hdrline->buffer, line, sizeof hdrline->buffer);
TAILQ_INSERT_TAIL(&rp->header.lines, hdrline, next);
return 1;
}
static int
parser_feed_body(struct rfc2822_parser *rp, const char *line)
{
/* for now, we only support per-line callbacks */
body_callback(rp, line);
return 1;
}
void
rfc2822_parser_init(struct rfc2822_parser *rp)
{
memset(rp, 0, sizeof *rp);
TAILQ_INIT(&rp->hdr_cb);
TAILQ_INIT(&rp->header.lines);
rfc2822_header_default_callback(rp, hdr_dflt_cb, NULL);
rfc2822_body_callback(rp, body_dflt_cb, NULL);
}
void
rfc2822_parser_reset(struct rfc2822_parser *rp)
{
header_reset(&rp->header);
rp->in_hdrs = 1;
}
void
rfc2822_parser_release(struct rfc2822_parser *rp)
{
struct rfc2822_hdr_cb *cb;
rfc2822_parser_reset(rp);
while ((cb = TAILQ_FIRST(&rp->hdr_cb))) {
TAILQ_REMOVE(&rp->hdr_cb, cb, next);
free(cb);
}
}
int
rfc2822_parser_feed(struct rfc2822_parser *rp, const char *line)
{
char buffer[RFC2822_MAX_LINE_SIZE+1];
/* in header and line is not a continuation, execute callback */
if (rp->in_hdr && (*line == '\0' || !isspace(*line)))
header_callback(rp);
/* no longer in headers */
if (*line == '\0')
rp->in_hdrs = 0;
if (rp->in_hdrs) {
/* line exceeds RFC maximum size requirement */
if (strlcpy(buffer, line, sizeof buffer) >= sizeof buffer)
return 0;
return parser_feed_header(rp, buffer);
}
/* don't enforce line max length on content, too many MUA break */
return parser_feed_body(rp, line);
}
int
rfc2822_header_callback(struct rfc2822_parser *rp, const char *header,
void (*func)(const struct rfc2822_header *, void *), void *arg)
{
struct rfc2822_hdr_cb *cb;
struct rfc2822_hdr_cb *cb_tmp;
char buffer[RFC2822_MAX_LINE_SIZE+1];
/* line exceeds RFC maximum size requirement */
if (strlcpy(buffer, header, sizeof buffer) >= sizeof buffer)
return 0;
TAILQ_FOREACH_SAFE(cb, &rp->hdr_cb, next, cb_tmp) {
if (strcasecmp(cb->name, buffer) == 0) {
TAILQ_REMOVE(&rp->hdr_cb, cb, next);
free(cb);
}
}
if ((cb = calloc(1, sizeof *cb)) == NULL)
return -1;
(void)strlcpy(cb->name, buffer, sizeof cb->name);
cb->func = func;
cb->arg = arg;
TAILQ_INSERT_TAIL(&rp->hdr_cb, cb, next);
return 1;
}
void
rfc2822_header_default_callback(struct rfc2822_parser *rp,
void (*func)(const struct rfc2822_header *, void *), void *arg)
{
struct rfc2822_hdr_cb *cb;
cb = &rp->hdr_dflt_cb;
cb->func = func;
cb->arg = arg;
}
void
rfc2822_body_callback(struct rfc2822_parser *rp,
void (*func)(const char *, void *), void *arg)
{
struct rfc2822_line_cb *cb;
cb = &rp->body_line_cb;
cb->func = func;
cb->arg = arg;
}
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