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/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "net.h"
#include "istream.h"
#include "write-full.h"
#include "module-context.h"
#include "rfc822-parser.h"
#include "rfc2231-parser.h"
#include "message-parser.h"
#include "mail-user.h"
#include "fts-parser.h"
#define SCRIPT_USER_CONTEXT(obj) \
MODULE_CONTEXT(obj, fts_parser_script_user_module)
#define SCRIPT_HANDSHAKE "VERSION\tscript\t4\t0\nalarm=10\nnoreply\n"
struct content {
const char *content_type;
const char *const *extensions;
};
struct fts_parser_script_user {
union mail_user_module_context module_ctx;
ARRAY(struct content) content;
};
struct script_fts_parser {
struct fts_parser parser;
int fd;
char *path;
unsigned char outbuf[IO_BLOCK_SIZE];
bool failed;
bool shutdown;
};
static MODULE_CONTEXT_DEFINE_INIT(fts_parser_script_user_module,
&mail_user_module_register);
static int script_connect(struct mail_user *user, const char **path_r)
{
const char *path;
int fd;
path = mail_user_plugin_getenv(user, "fts_decoder");
if (path == NULL)
return -1;
if (*path != '/')
path = t_strconcat(user->set->base_dir, "/", path, NULL);
fd = net_connect_unix_with_retries(path, 1000);
if (fd == -1)
i_error("net_connect_unix(%s) failed: %m", path);
else
net_set_nonblock(fd, FALSE);
*path_r = path;
return fd;
}
static int script_contents_read(struct mail_user *user)
{
struct fts_parser_script_user *suser = SCRIPT_USER_CONTEXT(user);
const char *path, *cmd, *line;
char **args;
struct istream *input;
struct content *content;
bool eof_seen = FALSE;
int fd, ret = 0;
i_assert(suser != NULL);
fd = script_connect(user, &path);
if (fd == -1)
return -1;
cmd = t_strdup_printf(SCRIPT_HANDSHAKE"\n");
if (write_full(fd, cmd, strlen(cmd)) < 0) {
i_error("write(%s) failed: %m", path);
i_close_fd(&fd);
return -1;
}
input = i_stream_create_fd_autoclose(&fd, 1024);
while ((line = i_stream_read_next_line(input)) != NULL) {
/* <content-type> <extension> [<extension> ...] */
args = p_strsplit_spaces(user->pool, line, " ");
if (args[0] == NULL) {
eof_seen = TRUE;
break;
}
if (args[0][0] == '\0' || args[1] == NULL) {
i_error("parser script sent invalid input: %s", line);
continue;
}
content = array_append_space(&suser->content);
content->content_type = str_lcase(args[0]);
content->extensions = (const void *)(args+1);
}
if (input->stream_errno != 0) {
i_error("parser script read(%s) failed: %s", path,
i_stream_get_error(input));
ret = -1;
} else if (!eof_seen) {
if (input->v_offset == 0)
i_error("parser script didn't send any data");
else
i_error("parser script didn't send empty EOF line");
}
i_stream_destroy(&input);
return ret;
}
static bool script_support_content(struct mail_user *user,
const char **content_type,
const char *filename)
{
struct fts_parser_script_user *suser = SCRIPT_USER_CONTEXT(user);
const struct content *content;
const char *extension;
if (suser == NULL) {
suser = p_new(user->pool, struct fts_parser_script_user, 1);
p_array_init(&suser->content, user->pool, 32);
MODULE_CONTEXT_SET(user, fts_parser_script_user_module, suser);
}
if (array_count(&suser->content) == 0) {
if (script_contents_read(user) < 0)
return FALSE;
}
if (strcmp(*content_type, "application/octet-stream") == 0) {
if (filename == NULL)
return FALSE;
extension = strrchr(filename, '.');
if (extension == NULL)
return FALSE;
extension = extension + 1;
array_foreach(&suser->content, content) {
if (content->extensions != NULL &&
str_array_icase_find(content->extensions, extension)) {
*content_type = content->content_type;
return TRUE;
}
}
} else {
array_foreach(&suser->content, content) {
if (strcmp(content->content_type, *content_type) == 0)
return TRUE;
}
}
return FALSE;
}
static void parse_content_disposition(const char *content_disposition,
const char **filename_r)
{
struct rfc822_parser_context parser;
const char *const *results, *filename2;
string_t *str;
*filename_r = NULL;
if (content_disposition == NULL)
return;
rfc822_parser_init(&parser, (const unsigned char *)content_disposition,
strlen(content_disposition), NULL);
rfc822_skip_lwsp(&parser);
/* type; param; param; .. */
str = t_str_new(32);
if (rfc822_parse_mime_token(&parser, str) < 0) {
rfc822_parser_deinit(&parser);
return;
}
rfc2231_parse(&parser, &results);
filename2 = NULL;
for (; *results != NULL; results += 2) {
if (strcasecmp(results[0], "filename") == 0) {
*filename_r = results[1];
break;
}
if (strcasecmp(results[0], "filename*") == 0)
filename2 = results[1];
}
if (*filename_r == NULL) {
/* RFC 2231 style non-ascii filename. we don't really care
much about the filename actually, just about its extension */
*filename_r = filename2;
}
rfc822_parser_deinit(&parser);
}
static struct fts_parser *
fts_parser_script_try_init(struct fts_parser_context *parser_context)
{
struct script_fts_parser *parser;
const char *filename, *path, *cmd;
int fd;
parse_content_disposition(parser_context->content_disposition, &filename);
if (!script_support_content(parser_context->user, &parser_context->content_type, filename))
return NULL;
fd = script_connect(parser_context->user, &path);
if (fd == -1)
return NULL;
cmd = t_strdup_printf(SCRIPT_HANDSHAKE"%s\n\n", parser_context->content_type);
if (write_full(fd, cmd, strlen(cmd)) < 0) {
i_error("write(%s) failed: %m", path);
i_close_fd(&fd);
return NULL;
}
parser = i_new(struct script_fts_parser, 1);
parser->parser.v = fts_parser_script;
parser->path = i_strdup(path);
parser->fd = fd;
return &parser->parser;
}
static void fts_parser_script_more(struct fts_parser *_parser,
struct message_block *block)
{
struct script_fts_parser *parser = (struct script_fts_parser *)_parser;
ssize_t ret;
if (block->size > 0) {
/* first we'll send everything to the script */
if (!parser->failed &&
write_full(parser->fd, block->data, block->size) < 0) {
i_error("write(%s) failed: %m", parser->path);
parser->failed = TRUE;
}
block->size = 0;
} else {
if (!parser->shutdown) {
if (shutdown(parser->fd, SHUT_WR) < 0)
i_error("shutdown(%s) failed: %m", parser->path);
parser->shutdown = TRUE;
}
/* read the result from the script */
ret = read(parser->fd, parser->outbuf, sizeof(parser->outbuf));
if (ret < 0)
i_error("read(%s) failed: %m", parser->path);
else {
block->data = parser->outbuf;
block->size = ret;
}
}
}
static int fts_parser_script_deinit(struct fts_parser *_parser,
const char **retriable_err_msg_r ATTR_UNUSED)
{
struct script_fts_parser *parser = (struct script_fts_parser *)_parser;
int ret = parser->failed ? -1 : 1;
if (close(parser->fd) < 0)
i_error("close(%s) failed: %m", parser->path);
i_free(parser->path);
i_free(parser);
return ret;
}
struct fts_parser_vfuncs fts_parser_script = {
fts_parser_script_try_init,
fts_parser_script_more,
fts_parser_script_deinit,
NULL
};
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