/*
* Save the uuencoded part of the file as it is read in since there's no need
* to include it in the parse tree. Saves memory and parse time.
* Return < 0 for failure
*/
int
uudecodeFile(message *m, const char *firstline, const char *dir, fmap_t *map, size_t *at)
{
fileblob *fb;
char buffer[RFC2821LENGTH + 1];
char *filename = cli_strtok(firstline, 2, " ");
if(filename == NULL)
return -1;
fb = fileblobCreate();
if(fb == NULL) {
free(filename);
return -1;
}
fileblobSetFilename(fb, dir, filename);
cli_dbgmsg("uudecode %s\n", filename);
free(filename);
while(fmap_gets(map, buffer, at, sizeof(buffer) - 1)) {
unsigned char data[1024];
const unsigned char *uptr;
size_t len;
cli_chomp(buffer);
if(strcasecmp(buffer, "end") == 0)
break;
if(buffer[0] == '\0')
break;
uptr = decodeLine(m, UUENCODE, buffer, data, sizeof(data));
if(uptr == NULL)
break;
len = (size_t)(uptr - data);
if((len > 62) || (len == 0))
break;
if(fileblobAddData(fb, data, len) < 0)
break;
}
fileblobDestroy(fb);
return 1;
}
int
cli_tnef(const char *dir, cli_ctx *ctx)
{
uint32_t i32;
uint16_t i16;
fileblob *fb;
int ret, alldone;
off_t fsize, pos = 0;
STATBUF statb;
fsize = ctx->fmap[0]->len;
if(fsize < (off_t) MIN_SIZE) {
cli_dbgmsg("cli_tngs: file too small, ignoring\n");
return CL_CLEAN;
}
if (fmap_readn(*ctx->fmap, &i32, pos, sizeof(uint32_t)) != sizeof(uint32_t)) {
/* The file is at least MIN_SIZE bytes, so it "can't" fail */
return CL_EREAD;
}
pos += sizeof(uint32_t);
if(host32(i32) != TNEF_SIGNATURE) {
return CL_EFORMAT;
}
if(fmap_readn(*ctx->fmap, &i16, pos, sizeof(uint16_t)) != sizeof(uint16_t)) {
/* The file is at least MIN_SIZE bytes, so it "can't" fail */
return CL_EREAD;
}
pos += sizeof(uint16_t);
fb = NULL;
ret = CL_CLEAN; /* we don't know if it's clean or not :-) */
alldone = 0;
do {
uint8_t part = 0;
uint16_t type = 0, tag = 0;
int32_t length = 0;
switch(tnef_header(*ctx->fmap, &pos, &part, &type, &tag, &length)) {
case 0:
alldone = 1;
break;
case 1:
break;
default:
/*
* Assume truncation, not file I/O error
*/
cli_warnmsg("cli_tnef: file truncated, returning CLEAN\n");
ret = CL_CLEAN;
alldone = 1;
break;
}
if(length == 0)
continue;
if(length < 0) {
cli_warnmsg("Corrupt TNEF header detected - length %d\n",
(int)length);
ret = CL_EFORMAT;
break;
}
if(alldone)
break;
switch(part) {
case LVL_MESSAGE:
cli_dbgmsg("TNEF - found message\n");
if(fb != NULL) {
fileblobDestroy(fb);
fb = NULL;
}
fb = fileblobCreate();
if(tnef_message(*ctx->fmap, &pos, type, tag, length, fsize) != 0) {
cli_dbgmsg("TNEF: Error reading TNEF message\n");
ret = CL_EFORMAT;
alldone = 1;
}
break;
case LVL_ATTACHMENT:
cli_dbgmsg("TNEF - found attachment\n");
if(tnef_attachment(*ctx->fmap, &pos, type, tag, length, dir, &fb, fsize) != 0) {
cli_dbgmsg("TNEF: Error reading TNEF attachment\n");
ret = CL_EFORMAT;
alldone = 1;
}
break;
case 0:
break;
default:
cli_warnmsg("TNEF - unknown level %d tag 0x%x\n", (int)part, (int)tag);
/*
* Dump the file incase it was part of an
* email that's about to be deleted
*/
if(cli_debug_flag) {
int fout = -1;
char *filename = cli_gentemp(ctx->engine->tmpdir);
char buffer[BUFSIZ];
if(filename)
fout = open(filename, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC|O_BINARY, 0600);
if(fout >= 0) {
int count;
cli_warnmsg("Saving dump to %s: refer to http://www.clamav.net/bugs\n", filename);
pos = 0;
while ((count = fmap_readn(*ctx->fmap, buffer, pos, sizeof(buffer))) > 0) {
pos += count;
cli_writen(fout, buffer, count);
}
close(fout);
}
free(filename);
}
ret = CL_EFORMAT;
alldone = 1;
break;
}
} while(!alldone);
if(fb) {
cli_dbgmsg("cli_tnef: flushing final data\n");
if(fileblobGetFilename(fb) == NULL) {
cli_dbgmsg("Saving TNEF portion with an unknown name\n");
fileblobSetFilename(fb, dir, "tnef");
}
fileblobDestroy(fb);
fb = NULL;
}
cli_dbgmsg("cli_tnef: returning %d\n", ret);
return ret;
}
static int
tnef_attachment(fmap_t *map, off_t *pos, uint16_t type, uint16_t tag, int32_t length, const char *dir, fileblob **fbref, off_t fsize)
{
uint32_t todo;
uint16_t i16;
off_t offset;
char *string;
cli_dbgmsg("attachment tag 0x%x, type 0x%x, length %d\n", tag, type,
(int)length);
offset = *pos;
switch(tag) {
case attATTACHTITLE:
if(length <= 0)
return -1;
string = cli_malloc(length + 1);
if(string == NULL) {
cli_errmsg("tnef_attachment: Unable to allocate memory for string\n");
return -1;
}
if(fmap_readn(map, string, *pos, (uint32_t)length) != (uint32_t)length) {
free(string);
return -1;
}
(*pos) += (uint32_t)length;
string[length] = '\0';
cli_dbgmsg("TNEF filename %s\n", string);
if(*fbref == NULL) {
*fbref = fileblobCreate();
if(*fbref == NULL) {
free(string);
return -1;
}
}
fileblobSetFilename(*fbref, dir, string);
free(string);
break;
case attATTACHDATA:
if(*fbref == NULL) {
*fbref = fileblobCreate();
if(*fbref == NULL)
return -1;
}
todo = length;
while(todo) {
unsigned char buf[BUFSIZ];
int32_t got = fmap_readn(map, buf, *pos, MIN(sizeof(buf), todo));
if (got <= 0)
break;
(*pos) += got;
fileblobAddData(*fbref, buf, got);
todo -= got;
}
break;
default:
cli_dbgmsg("TNEF - unsupported attachment tag 0x%x type 0x%d length %d\n",
tag, type, (int)length);
break;
}
/*cli_dbgmsg("%lu %lu\n", (long)(offset + length), ftell(fp));*/
if(!CLI_ISCONTAINED2(0, fsize, (off_t)offset, (off_t)length)) {
cli_dbgmsg("TNEF: Incorrect length field in tnef_attachment\n");
return -1;
}
(*pos) = (long)(offset + length); /* shouldn't be needed */
(*pos) += 2;
return 0;
}
