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|
/***MODULE:surbl
* rspamd module that implements SURBL url checking
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <syslog.h>
#include <fcntl.h>
#include <stdlib.h>
#include <evdns.h>
#include "../config.h"
#include "../main.h"
#include "../modules.h"
#include "../cfg_file.h"
#include "../memcached.h"
#define DEFAULT_REDIRECTOR_PORT 8080
#define DEFAULT_SURBL_WEIGHT 10
#define DEFAULT_REDIRECTOR_CONNECT_TIMEOUT 1000
#define DEFAULT_REDIRECTOR_READ_TIMEOUT 5000
#define DEFAULT_SURBL_MAX_URLS 1000
#define DEFAULT_SURBL_URL_EXPIRE 86400
#define DEFAULT_SURBL_SUFFIX "multi.surbl.org"
struct surbl_ctx {
int (*header_filter)(struct worker_task *task);
int (*mime_filter)(struct worker_task *task);
int (*message_filter)(struct worker_task *task);
int (*url_filter)(struct worker_task *task);
struct in_addr redirector_addr;
uint16_t redirector_port;
uint16_t weight;
unsigned int connect_timeout;
unsigned int read_timeout;
unsigned int max_urls;
unsigned int url_expire;
char *suffix;
GHashTable *hosters;
GHashTable *whitelist;
unsigned use_redirector:1;
};
struct redirector_param {
struct uri *url;
struct worker_task *task;
enum {
STATE_CONNECT,
STATE_READ,
} state;
struct event ev;
int sock;
};
struct memcached_param {
struct uri *url;
struct worker_task *task;
memcached_ctx_t *ctx;
};
static char *hash_fill = "1";
struct surbl_ctx *surbl_module_ctx;
GRegex *extract_hoster_regexp, *extract_normal_regexp, *extract_numeric_regexp;
static int surbl_test_url (struct worker_task *task);
int
surbl_module_init (struct config_file *cfg, struct module_ctx **ctx)
{
struct hostent *hent;
GError *err = NULL;
char *value, *cur_tok, *str;
surbl_module_ctx = g_malloc (sizeof (struct surbl_ctx));
surbl_module_ctx->header_filter = NULL;
surbl_module_ctx->mime_filter = NULL;
surbl_module_ctx->message_filter = NULL;
surbl_module_ctx->url_filter = surbl_test_url;
surbl_module_ctx->use_redirector = 0;
if ((value = get_module_opt (cfg, "surbl", "redirector")) != NULL) {
str = strdup (value);
cur_tok = strsep (&str, ":");
if (!inet_aton (cur_tok, &surbl_module_ctx->redirector_addr)) {
/* Try to call gethostbyname */
hent = gethostbyname (cur_tok);
if (hent != NULL) {
memcpy((char *)&surbl_module_ctx->redirector_addr, hent->h_addr, sizeof(struct in_addr));
if (str != NULL) {
surbl_module_ctx->redirector_port = (uint16_t)strtoul (str, NULL, 10);
}
else {
surbl_module_ctx->redirector_port = DEFAULT_REDIRECTOR_PORT;
}
surbl_module_ctx->use_redirector = 1;
}
}
/* Free cur_tok as it is actually initial str after strsep */
free (cur_tok);
}
if ((value = get_module_opt (cfg, "surbl", "weight")) != NULL) {
surbl_module_ctx->weight = atoi (value);
}
else {
surbl_module_ctx->weight = DEFAULT_SURBL_WEIGHT;
}
if ((value = get_module_opt (cfg, "surbl", "url_expire")) != NULL) {
surbl_module_ctx->url_expire = atoi (value);
}
else {
surbl_module_ctx->url_expire = DEFAULT_SURBL_URL_EXPIRE;
}
if ((value = get_module_opt (cfg, "surbl", "redirector_connect_timeout")) != NULL) {
surbl_module_ctx->connect_timeout = parse_seconds (value);
}
else {
surbl_module_ctx->connect_timeout = DEFAULT_REDIRECTOR_CONNECT_TIMEOUT;
}
if ((value = get_module_opt (cfg, "surbl", "redirector_read_timeout")) != NULL) {
surbl_module_ctx->read_timeout = parse_seconds (value);
}
else {
surbl_module_ctx->read_timeout = DEFAULT_REDIRECTOR_READ_TIMEOUT;
}
if ((value = get_module_opt (cfg, "surbl", "max_urls")) != NULL) {
surbl_module_ctx->max_urls = atoi (value);
}
else {
surbl_module_ctx->max_urls = DEFAULT_SURBL_MAX_URLS;
}
if ((value = get_module_opt (cfg, "surbl", "suffix")) != NULL) {
surbl_module_ctx->suffix = value;
}
else {
surbl_module_ctx->suffix = DEFAULT_SURBL_SUFFIX;
}
surbl_module_ctx->hosters = g_hash_table_new (g_str_hash, g_str_equal);
surbl_module_ctx->whitelist = g_hash_table_new (g_str_hash, g_str_equal);
if ((value = get_module_opt (cfg, "surbl", "hostings")) != NULL) {
char comment_flag = 0;
str = value;
while (*value ++) {
if (*value == '#') {
comment_flag = 1;
}
if (*value == '\r' || *value == '\n' || *value == ',') {
if (!comment_flag && str != value) {
g_hash_table_insert (surbl_module_ctx->hosters, g_strstrip(str), hash_fill);
str = value + 1;
}
else if (*value != ',') {
comment_flag = 0;
str = value + 1;
}
}
}
}
if ((value = get_module_opt (cfg, "surbl", "whitelist")) != NULL) {
char comment_flag = 0;
str = value;
while (*value ++) {
if (*value == '#') {
comment_flag = 1;
}
if (*value == '\r' || *value == '\n' || *value == ',') {
if (!comment_flag && str != value) {
g_hash_table_insert (surbl_module_ctx->whitelist, g_strstrip(str), hash_fill);
str = value + 1;
}
else if (*value != ',') {
comment_flag = 0;
str = value + 1;
}
}
}
}
/* Init matching regexps */
extract_hoster_regexp = g_regex_new ("([^.]+)\\.([^.]+)\\.([^.]+)$", G_REGEX_RAW, 0, &err);
extract_normal_regexp = g_regex_new ("([^.]+)\\.([^.]+)$", G_REGEX_RAW, 0, &err);
extract_numeric_regexp = g_regex_new ("(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$", G_REGEX_RAW, 0, &err);
*ctx = (struct module_ctx *)surbl_module_ctx;
evdns_init ();
return 0;
}
static char *
format_surbl_request (char *hostname)
{
GMatchInfo *info;
char *result;
result = g_malloc (strlen (hostname) + strlen (surbl_module_ctx->suffix) + 1);
/* First try to match numeric expression */
if (g_regex_match (extract_numeric_regexp, hostname, 0, &info) == TRUE) {
gchar *octet1, *octet2, *octet3, *octet4;
octet1 = g_match_info_fetch (info, 0);
g_match_info_next (info, NULL);
octet2 = g_match_info_fetch (info, 0);
g_match_info_next (info, NULL);
octet3 = g_match_info_fetch (info, 0);
g_match_info_next (info, NULL);
octet4 = g_match_info_fetch (info, 0);
g_match_info_free (info);
sprintf (result, "%s.%s.%s.%s.%s", octet4, octet3, octet2, octet1, surbl_module_ctx->suffix);
g_free (octet1);
g_free (octet2);
g_free (octet3);
g_free (octet4);
return result;
}
g_match_info_free (info);
/* Try to match normal domain */
if (g_regex_match (extract_normal_regexp, hostname, 0, &info) == TRUE) {
gchar *part1, *part2;
part1 = g_match_info_fetch (info, 0);
g_match_info_next (info, NULL);
part2 = g_match_info_fetch (info, 0);
g_match_info_free (info);
sprintf (result, "%s.%s", part1, part2);
if (g_hash_table_lookup (surbl_module_ctx->hosters, result) != NULL) {
/* Match additional part for hosters */
g_free (part1);
g_free (part2);
if (g_regex_match (extract_hoster_regexp, hostname, 0, &info) == TRUE) {
gchar *hpart1, *hpart2, *hpart3;
hpart1 = g_match_info_fetch (info, 0);
g_match_info_next (info, NULL);
hpart2 = g_match_info_fetch (info, 0);
g_match_info_next (info, NULL);
hpart3 = g_match_info_fetch (info, 0);
g_match_info_free (info);
sprintf (result, "%s.%s.%s.%s", hpart1, hpart2, hpart3, surbl_module_ctx->suffix);
g_free (hpart1);
g_free (hpart2);
g_free (hpart3);
return result;
}
return NULL;
}
g_free (part1);
g_free (part2);
return result;
}
return NULL;
}
static void
dns_callback (int result, char type, int count, int ttl, void *addresses, void *data)
{
struct memcached_param *param = (struct memcached_param *)data;
struct filter_result *res;
/* If we have result from DNS server, this url exists in SURBL, so increase score */
if (result != DNS_ERR_NONE || type != DNS_IPv4_A) {
msg_info ("surbl_check: url %s is in surbl %s", param->url->host, surbl_module_ctx->suffix);
res = TAILQ_LAST (¶m->task->results, resultsq);
res->mark += surbl_module_ctx->weight;
}
param->task->save.saved --;
if (param->task->save.saved == 0) {
/* Call other filters */
param->task->save.saved = 1;
process_filters (param->task);
}
g_free (param->ctx->param->buf);
g_free (param->ctx->param);
g_free (param->ctx);
g_free (param);
}
static void
memcached_callback (memcached_ctx_t *ctx, memc_error_t error, void *data)
{
struct memcached_param *param = (struct memcached_param *)data;
int *url_count;
struct filter_result *res;
char *surbl_req;
switch (ctx->op) {
case CMD_CONNECT:
if (error != OK) {
msg_info ("memcached_callback: memcached returned error %s on CONNECT stage");
memc_close_ctx (param->ctx);
param->task->save.saved --;
if (param->task->save.saved == 0) {
/* Call other filters */
param->task->save.saved = 1;
process_filters (param->task);
}
g_free (param->ctx->param->buf);
g_free (param->ctx->param);
g_free (param->ctx);
g_free (param);
}
else {
memc_get (param->ctx, param->ctx->param);
}
break;
case CMD_READ:
if (error != OK) {
msg_info ("memcached_callback: memcached returned error %s on READ stage");
memc_close_ctx (param->ctx);
param->task->save.saved --;
if (param->task->save.saved == 0) {
/* Call other filters */
param->task->save.saved = 1;
process_filters (param->task);
}
g_free (param->ctx->param->buf);
g_free (param->ctx->param);
g_free (param->ctx);
g_free (param);
}
else {
url_count = (int *)param->ctx->param->buf;
/* Do not check DNS for urls that have count more than max_urls */
if (*url_count > surbl_module_ctx->max_urls) {
msg_info ("memcached_callback: url '%s' has count %d, max: %d", struri (param->url), *url_count, surbl_module_ctx->max_urls);
res = TAILQ_LAST (¶m->task->results, resultsq);
res->mark += surbl_module_ctx->weight;
}
(*url_count) ++;
memc_set (param->ctx, param->ctx->param, surbl_module_ctx->url_expire);
}
break;
case CMD_WRITE:
if (error != OK) {
msg_info ("memcached_callback: memcached returned error %s on WRITE stage");
}
memc_close_ctx (param->ctx);
param->task->save.saved --;
if (param->task->save.saved == 0) {
/* Call other filters */
param->task->save.saved = 1;
process_filters (param->task);
}
if ((surbl_req = format_surbl_request (param->url->host)) != NULL) {
param->task->save.saved ++;
evdns_resolve_ipv4 (surbl_req, DNS_QUERY_NO_SEARCH, dns_callback, (void *)param);
return;
}
g_free (param->ctx->param->buf);
g_free (param->ctx->param);
g_free (param->ctx);
g_free (param);
break;
}
}
static void
register_memcached_call (struct uri *url, struct worker_task *task)
{
struct memcached_param *param;
struct memcached_server *selected;
memcached_param_t *cur_param;
gchar *sum_str;
int *url_count;
param = g_malloc (sizeof (struct memcached_param));
cur_param = g_malloc (sizeof (memcached_param_t));
url_count = g_malloc (sizeof (int));
param->url = url;
param->task = task;
param->ctx = g_malloc (sizeof (memcached_ctx_t));
bzero (param->ctx, sizeof (memcached_ctx_t));
bzero (cur_param, sizeof (memcached_param_t));
cur_param->buf = (u_char *)url_count;
cur_param->bufsize = sizeof (int);
sum_str = g_compute_checksum_for_string (G_CHECKSUM_MD5, struri (url), -1);
strlcpy (cur_param->key, sum_str, sizeof (cur_param->key));
g_free (sum_str);
selected = (struct memcached_server *) get_upstream_by_hash ((void *)task->cfg->memcached_servers,
task->cfg->memcached_servers_num, sizeof (struct memcached_server),
time (NULL), task->cfg->memcached_error_time, task->cfg->memcached_dead_time, task->cfg->memcached_maxerrors,
cur_param->key, strlen(cur_param->key));
param->ctx->callback = memcached_callback;
param->ctx->callback_data = (void *)param;
param->ctx->protocol = task->cfg->memcached_protocol;
memcpy(¶m->ctx->addr, &selected->addr, sizeof (struct in_addr));
param->ctx->port = selected->port;
param->ctx->timeout.tv_sec = task->cfg->memcached_connect_timeout / 1000;
param->ctx->timeout.tv_sec = task->cfg->memcached_connect_timeout - param->ctx->timeout.tv_sec * 1000;
param->ctx->sock = -1;
#ifdef WITH_DEBUG
param->ctx->options = MEMC_OPT_DEBUG;
#else
param->ctx->options = 0;
#endif
param->ctx->param = cur_param;
memc_init_ctx (param->ctx);
}
static void
redirector_callback (int fd, short what, void *arg)
{
struct redirector_param *param = (struct redirector_param *)arg;
char url_buf[1024];
int r;
struct timeval timeout;
char *p, *c;
switch (param->state) {
case STATE_CONNECT:
/* We have write readiness after connect call, so reinit event */
if (what == EV_WRITE) {
timeout.tv_sec = surbl_module_ctx->connect_timeout / 1000;
timeout.tv_usec = surbl_module_ctx->connect_timeout - timeout.tv_sec * 1000;
event_del (¶m->ev);
event_set (¶m->ev, param->sock, EV_READ | EV_PERSIST | EV_TIMEOUT, redirector_callback, (void *)param);
event_add (¶m->ev, &timeout);
r = snprintf (url_buf, sizeof (url_buf), "GET %s HTTP/1.0\r\n\r\n", struri (param->url));
write (param->sock, url_buf, r);
param->state = STATE_READ;
}
else {
event_del (¶m->ev);
msg_info ("redirector_callback: connection to redirector timed out");
param->task->save.saved --;
if (param->task->save.saved == 0) {
/* Call other filters */
param->task->save.saved = 1;
process_filters (param->task);
}
g_free (param);
}
break;
case STATE_READ:
if (what == EV_READ) {
r = read (param->sock, url_buf, sizeof (url_buf));
if ((p = strstr (url_buf, "Uri: ")) != NULL) {
p += sizeof ("Uri: ") - 1;
c = p;
while (p++ < url_buf + sizeof (url_buf) - 1) {
if (*p == '\r' || *p == '\n') {
*p = '\0';
break;
}
}
if (*p == '\0') {
msg_info ("redirector_callback: got reply from redirector: '%s' -> '%s'", struri (param->url), c);
parse_uri (param->url, c);
register_memcached_call (param->url, param->task);
param->task->save.saved ++;
}
}
event_del (¶m->ev);
param->task->save.saved --;
if (param->task->save.saved == 0) {
/* Call other filters */
param->task->save.saved = 1;
process_filters (param->task);
}
g_free (param);
}
else {
event_del (¶m->ev);
msg_info ("redirector_callback: reading redirector timed out");
param->task->save.saved --;
if (param->task->save.saved == 0) {
/* Call other filters */
param->task->save.saved = 1;
process_filters (param->task);
}
g_free (param);
}
break;
}
}
static void
register_redirector_call (struct uri *url, struct worker_task *task)
{
struct sockaddr_in sc;
int ofl, r, s;
struct redirector_param *param;
struct timeval timeout;
bzero (&sc, sizeof (struct sockaddr_in *));
sc.sin_family = AF_INET;
sc.sin_port = surbl_module_ctx->redirector_port;
memcpy (&sc.sin_addr, &surbl_module_ctx->redirector_addr, sizeof (struct in_addr));
s = socket (PF_INET, SOCK_STREAM, 0);
if (s == -1) {
msg_info ("register_redirector_call: socket() failed: %m");
return;
}
/* set nonblocking */
ofl = fcntl(s, F_GETFL, 0);
fcntl(s, F_SETFL, ofl | O_NONBLOCK);
if ((r = connect (s, (struct sockaddr*)&sc, sizeof (struct sockaddr_in))) == -1) {
if (errno != EINPROGRESS) {
close (s);
msg_info ("register_redirector_call: connect() failed: %m");
}
}
param = g_malloc (sizeof (struct redirector_param));
param->url = url;
param->task = task;
param->state = STATE_READ;
param->sock = s;
timeout.tv_sec = surbl_module_ctx->connect_timeout / 1000;
timeout.tv_usec = surbl_module_ctx->connect_timeout - timeout.tv_sec * 1000;
event_set (¶m->ev, s, EV_WRITE | EV_TIMEOUT, redirector_callback, (void *)param);
event_add (¶m->ev, &timeout);
}
static int
surbl_test_url (struct worker_task *task)
{
struct uri *url;
TAILQ_FOREACH (url, &task->urls, next) {
if (surbl_module_ctx->use_redirector) {
register_redirector_call (url, task);
}
else {
register_memcached_call (url, task);
}
task->save.saved++;
}
return 0;
}
/*
* vi:ts=4
*/
|