/* $Id: attach.c,v 1.29 2007/08/31 14:16:01 nicm Exp $ */
/*
* Copyright (c) 2006 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 MIND, 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 <ctype.h>
#include <string.h>
#include "fdm.h"
char *attach_type(struct mail *, char *, const char *, char **);
struct attach *attach_get(struct mail *, char **, size_t *, const char *,
int *);
struct attach *
attach_visit(struct attach *atr, u_int *n)
{
struct attach *atn;
if (atr == NULL)
return (NULL);
if (TAILQ_EMPTY(&atr->children)) {
atn = TAILQ_NEXT(atr, entry);
if (atn == NULL) {
if (n != NULL)
(*n)--;
atr = atr->parent;
if (atr != NULL)
atr = TAILQ_NEXT(atr, entry);
} else
atr = atn;
} else {
if (n != NULL)
(*n)++;
atr = TAILQ_FIRST(&atr->children);
}
return (atr);
}
void printflike2
attach_log(struct attach *atr, const char *fmt, ...)
{
va_list ap;
char *prefix;
u_int n;
va_start(ap, fmt);
xvasprintf(&prefix, fmt, ap);
va_end(ap);
n = 0;
while (atr != NULL) {
if (TAILQ_EMPTY(&atr->children)) {
if (atr->name == NULL) {
log_debug3("%s:%*s%u, %s: offset %zu, size %zu,"
" body %zu", prefix, n + 1, " ", atr->idx,
atr->type, atr->data, atr->size, atr->body);
} else {
log_debug3("%s:%*s%u, %s: offset %zu, size %zu,"
" body %zu: %s", prefix, n + 1, " ",
atr->idx, atr->type, atr->data, atr->size,
atr->body, atr->name);
}
} else {
log_debug3("%s:%*s%u, %s", prefix, n + 1, " ", atr->idx,
atr->type);
}
atr = attach_visit(atr, &n);
}
xfree(prefix);
}
void
attach_free(struct attach *atr)
{
struct attach *at;
while (!TAILQ_EMPTY(&atr->children)) {
at = TAILQ_FIRST(&atr->children);
TAILQ_REMOVE(&atr->children, at, entry);
attach_free(at);
}
if (atr->type != NULL)
xfree(atr->type);
if (atr->name != NULL)
xfree(atr->name);
xfree(atr);
}
char *
attach_type(struct mail *m, char *hdr, const char *name, char **value)
{
size_t len, llen;
ssize_t namelen;
char *ptr, *type = NULL;
*value = NULL;
len = m->size - (hdr - m->data);
if (len < 13 || strncasecmp(hdr, "content-type:", 13) != 0)
goto error;
len -= 13;
hdr += 13;
/* Skip spaces. */
while (len > 0 && isspace((u_char) *hdr)) {
len--;
hdr++;
}
if (len == 0)
goto error;
/* Find end of line. */
ptr = memchr(hdr, '\n', len);
if (ptr == NULL)
llen = len;
else
llen = ptr - hdr;
/* Find type. */
ptr = memchr(hdr, ';', llen);
if (ptr == NULL)
ptr = hdr + llen;
type = xmalloc(ptr - hdr + 1);
memcpy(type, hdr, ptr - hdr);
type[ptr - hdr] = '\0';
len -= ptr - hdr;
hdr = ptr;
/* If this is now the end of the line, return the type. */
if (len == 0 || *ptr == '\n')
return (type);
/* Skip the semicolon. */
len--;
hdr++;
/*
* Now follows a set of attributes of the form name=value, separated
* by semicolons, possibly crossing multiple lines and possibly with
* the value enclosed in quotes.
*/
namelen = strlen(name);
for (;;) {
/* Skip spaces and newlines. */
while (len > 0 && (isspace((u_char) *hdr) || *hdr == '\n')) {
hdr++;
len--;
}
if (len == 0)
goto error;
/* Find end of line. */
ptr = memchr(hdr, '\n', len);
if (ptr == NULL)
llen = len;
else
llen = ptr - hdr;
/* Find the end of the attribute name. */
ptr = memchr(hdr, '=', llen);
if (ptr == NULL)
break;
if (ptr - hdr == namelen && strncmp(hdr, name, namelen) == 0) {
llen -= (ptr - hdr + 1);
hdr = ptr + 1;
ptr = memchr(hdr, ';', llen);
if (ptr != NULL)
llen = ptr - hdr;
if (*hdr == '"') {
if (llen < 2 || hdr[llen - 1] != '"')
goto error;
hdr++;
llen -= 2;
}
*value = xmalloc(llen + 1);
memcpy(*value, hdr, llen);
(*value)[llen] = '\0';
break;
}
/* Skip to next semicolon. */
ptr = memchr(hdr, ';', llen);
if (ptr == NULL)
break;
hdr = ptr + 1;
len -= (ptr - hdr) + 1;
}
return (type);
error:
if (type != NULL)
xfree(type);
if (*value != NULL) {
xfree(*value);
*value = NULL;
}
return (NULL);
}
struct attach *
attach_build(struct mail *m)
{
struct attach *atr = NULL, *at;
char *hdr, *ptr, *b = NULL, *type;
size_t len, bl;
int last;
u_int n;
hdr = find_header(m, "content-type", &len, 0);
if (hdr == NULL)
return (NULL);
type = attach_type(m, hdr, "boundary", &b);
if (type == NULL || b == NULL) {
if (type != NULL)
xfree(type);
goto error;
}
if (strncasecmp(type, "multipart/", 10) != 0) {
xfree(type);
goto error;
}
bl = strlen(b);
atr = xmalloc(sizeof *atr);
memset(atr, 0, sizeof *atr);
TAILQ_INIT(&atr->children);
atr->type = type;
/* Find the first boundary. */
line_init(m, &ptr, &len);
while (ptr != NULL) {
if (ptr[0] == '-' && ptr[1] == '-') {
if (len - 3 == bl && strncmp(ptr + 2, b, bl) == 0)
break;
}
line_next(m, &ptr, &len);
}
if (ptr == NULL)
goto error;
/* Now iterate over the rest. */
last = 0;
n = 0;
while (ptr != NULL && !last) {
if (ptr[0] == '-' && ptr[1] == '-') {
if (len - 5 == bl && strncmp(ptr + 2, b, bl) == 0)
break;
}
at = attach_get(m, &ptr, &len, b, &last);
if (at == NULL)
goto error;
at->idx = n++;
at->parent = atr;
TAILQ_INSERT_TAIL(&atr->children, at, entry);
}
if (ptr == NULL)
goto error;
xfree(b);
return (atr);
error:
if (atr != NULL)
attach_free(atr);
if (b != NULL)
xfree(b);
return (NULL);
}
struct attach *
attach_get(struct mail *m, char **ptr, size_t *len, const char *b, int *last)
{
struct attach *atr, *at;
char *name = NULL, *b2 = NULL;
size_t bl, bl2;
int last2;
u_int n;
bl = strlen(b);
atr = xmalloc(sizeof *atr);
memset(atr, 0, sizeof *atr);
TAILQ_INIT(&atr->children);
atr->data = *ptr - m->data;
while (*ptr != NULL) {
if (*len >= 13 && strncasecmp(*ptr, "content-type:", 13) == 0)
break;
line_next(m, ptr, len);
}
if (*ptr == NULL)
goto error;
atr->type = attach_type(m, *ptr, "name", &name);
if (atr->type == NULL) {
if (name != NULL)
xfree(name);
goto error;
}
atr->name = name;
if (strncasecmp(atr->type, "multipart/", 10) != 0) {
/* Skip the remaining headers. */
while (*ptr != NULL && *len > 1)
line_next(m, ptr, len);
if (*ptr == NULL)
goto error;
atr->body = *ptr - m->data;
for (;;) {
line_next(m, ptr, len);
if (*ptr == NULL)
break;
if (*len < 3 || (*ptr)[0] != '-' || (*ptr)[1] != '-')
continue;
if (*len - 5 == bl && strncmp(*ptr + 2, b, bl) == 0 &&
strncmp(*ptr + bl + 2, "--", 2) == 0) {
*last = 1;
break;
}
if (*len - 3 == bl && strncmp(*ptr + 2, b, bl) == 0)
break;
}
if (*ptr == NULL)
goto error;
atr->size = *ptr - m->data - atr->data;
} else {
/* XXX avoid doing this twice. */
xfree(atr->type);
atr->type = attach_type(m, *ptr, "boundary", &b2);
if (b2 == NULL)
goto error;
bl2 = strlen(b2);
/* Find the first boundary. */
while (*ptr != NULL) {
if ((*ptr)[0] == '-' && (*ptr)[1] == '-') {
if (*len - 3 == bl2 &&
strncmp(*ptr + 2, b2, bl2) == 0)
break;
}
line_next(m, ptr, len);
}
if (ptr == NULL)
goto error;
/* Now iterate over the rest. */
last2 = 0;
n = 0;
while (*ptr != NULL && !last2) {
at = attach_get(m, ptr, len, b2, &last2);
if (at == NULL)
goto error;
at->idx = n++;
at->parent = atr;
TAILQ_INSERT_TAIL(&atr->children, at, entry);
}
/* And skip on to the end of the multipart. */
while (*ptr != NULL) {
if ((*ptr)[0] == '-' && (*ptr)[1] == '-') {
if (*len - 5 == bl2 &&
strncmp(*ptr + 2, b2, bl2) == 0)
break;
}
line_next(m, ptr, len);
}
if (*ptr == NULL)
goto error;
line_next(m, ptr, len);
xfree(b2);
}
return (atr);
error:
if (b2 != NULL)
xfree(b2);
attach_free(atr);
return (NULL);
}
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