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#include "control_udp.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <pcre2.h>
#include <glib.h>
#include <time.h>
#include <netinet/in.h>
#include <errno.h>
#include "poller.h"
#include "helpers.h"
#include "log.h"
#include "call.h"
#include "udp_listener.h"
#include "call_interfaces.h"
#include "socket.h"
#include "log_funcs.h"
static void control_udp_incoming(struct obj *obj, struct udp_buffer *udp_buf) {
struct control_udp *u = (void *) obj;
int ret;
char **out;
struct iovec iov[10];
unsigned int iovlen;
str cookie, reply = STR_NULL;
cache_entry *ce;
pcre2_match_data *md = pcre2_match_data_create(30, NULL);
ret = pcre2_match(u->parse_re, (PCRE2_SPTR8) udp_buf->str.s, udp_buf->str.len, 0, 0, md, NULL);
if (ret <= 0) {
ret = pcre2_match(u->fallback_re, (PCRE2_SPTR8) udp_buf->str.s, udp_buf->str.len, 0, 0, md, NULL);
if (ret <= 0) {
ilogs(control, LOG_WARNING, "Unable to parse command line from udp:%s: %.*s", udp_buf->addr, STR_FMT(&udp_buf->str));
pcre2_match_data_free(md);
return;
}
ilogs(control, LOG_WARNING, "Failed to properly parse UDP command line '%.*s' from %s, using fallback RE", STR_FMT(&udp_buf->str), udp_buf->addr);
pcre2_substring_list_get(md, (PCRE2_UCHAR ***) &out, NULL);
iov[0].iov_base = (void *) out[RE_UDP_COOKIE];
iov[0].iov_len = strlen(out[RE_UDP_COOKIE]);
if (out[RE_UDP_UL_CMD] && (chrtoupper(out[RE_UDP_UL_CMD][0]) == 'U' || chrtoupper(out[RE_UDP_UL_CMD][0]) == 'L')) {
iov[1].iov_base = (void *) out[4];
iov[1].iov_len = strlen(out[4]);
iov[2].iov_base = (void *) out[3];
iov[2].iov_len = strlen(out[3]);
iov[3].iov_base = "\n";
iov[3].iov_len = 1;
iovlen = 4;
}
else {
iov[1].iov_base = " E8\n";
iov[1].iov_len = 4;
iovlen = 2;
}
socket_sendiov(udp_buf->listener, iov, iovlen, &udp_buf->sin, &udp_buf->local_addr);
pcre2_substring_list_free((SUBSTRING_FREE_ARG) out);
pcre2_match_data_free(md);
return;
}
ilogs(control, LOG_INFO, "Got valid command from udp:%s: %.*s", udp_buf->addr, STR_FMT(&udp_buf->str));
pcre2_substring_list_get(md, (PCRE2_UCHAR ***) &out, NULL);
cookie = STR(out[RE_UDP_COOKIE]);
ce = cookie_cache_lookup(&u->cookie_cache, &cookie);
if (ce) {
reply = ce->reply;
ilogs(control, LOG_INFO, "Detected command from udp:%s as a duplicate", udp_buf->addr);
socket_sendto_from(udp_buf->listener, reply.s, reply.len, &udp_buf->sin, &udp_buf->local_addr);
cache_entry_free(ce);
goto out;
}
if (out[RE_UDP_UL_CALLID])
log_info_c_string(out[RE_UDP_UL_CALLID]);
else if (out[RE_UDP_DQ_CALLID])
log_info_c_string(out[RE_UDP_DQ_CALLID]);
if (chrtoupper(out[RE_UDP_UL_CMD][0]) == 'U')
reply = call_update_udp(out, udp_buf->addr);
else if (chrtoupper(out[RE_UDP_UL_CMD][0]) == 'L')
reply = call_lookup_udp(out);
else if (chrtoupper(out[RE_UDP_DQ_CMD][0]) == 'D')
reply = call_delete_udp(out);
else if (chrtoupper(out[RE_UDP_DQ_CMD][0]) == 'Q')
reply = call_query_udp(out);
else if (chrtoupper(out[RE_UDP_V_CMD][0]) == 'V') {
iovlen = 2;
iov[0].iov_base = (void *) out[RE_UDP_COOKIE];
iov[0].iov_len = strlen(out[RE_UDP_COOKIE]);
iov[1].iov_base = " ";
iov[1].iov_len = 1;
if (chrtoupper(out[RE_UDP_V_FLAGS][0]) == 'F') {
ret = 0;
if (!strcmp(out[RE_UDP_V_PARMS], "20040107"))
ret = 1;
else if (!strcmp(out[RE_UDP_V_PARMS], "20050322"))
ret = 1;
else if (!strcmp(out[RE_UDP_V_PARMS], "20060704"))
ret = 1;
iov[2].iov_base = ret ? "1\n" : "0\n";
iov[2].iov_len = 2;
iovlen++;
}
else {
iov[2].iov_base = "20040107\n";
iov[2].iov_len = 9;
iovlen++;
}
socket_sendiov(udp_buf->listener, iov, iovlen, &udp_buf->sin, &udp_buf->local_addr);
}
if (reply.len) {
socket_sendto_from(udp_buf->listener, reply.s, reply.len, &udp_buf->sin, &udp_buf->local_addr);
str callid = STR_NULL;
cache_entry new_ce = {.reply = reply, .callid = callid};
cookie_cache_insert(&u->cookie_cache, &cookie, &new_ce);
g_free(reply.s);
}
else
cookie_cache_remove(&u->cookie_cache, &cookie);
out:
pcre2_substring_list_free((SUBSTRING_FREE_ARG) out);
pcre2_match_data_free(md);
log_info_pop();
}
void control_udp_free(struct control_udp *u) {
pcre2_code_free(u->parse_re);
pcre2_code_free(u->fallback_re);
close_socket(&u->udp_listener);
cookie_cache_cleanup(&u->cookie_cache);
}
struct control_udp *control_udp_new(const endpoint_t *ep) {
struct control_udp *c;
PCRE2_SIZE erroff;
int errcode;
c = obj_alloc0(struct control_udp, control_udp_free);
c->parse_re = pcre2_compile(
/* cookie cmd flags callid viabranch:5 */
(PCRE2_SPTR8) "^(\\S+)\\s+(?:([ul])(\\S*)\\s+([^;]+)(?:;(\\S+))?\\s+" \
/* addr4 addr6:7 */
"(?:([\\d.]+)|([\\da-f:]+(?::ffff:[\\d.]+)?))" \
/* port fromtag num totag:11 */
"\\s+(\\d+)\\s+(\\S+?);(\\d+)(?:\\s+(\\S+?);\\d+(?:\\s+.*)?)?\r?\n?$" \
/* "d/q" flags callid viabranch fromtag totag:17 */
"|([dq])(\\S*)\\s+([^;\\s]+)(?:;(\\S+))?\\s+(\\S+?)(?:;\\d+)?(?:\\s+(\\S+?)(?:;\\d+)?)?\r?\n?$" \
/* v flags params:20 */
"|(v)(\\S*)(?:\\s+(\\S+))?)",
PCRE2_ZERO_TERMINATED,
PCRE2_DOLLAR_ENDONLY | PCRE2_DOTALL | PCRE2_CASELESS, &errcode, &erroff, NULL);
/* cookie cmd flags callid addr port */
c->fallback_re = pcre2_compile((PCRE2_SPTR8) "^(\\S+)(?:\\s+(\\S)\\S*\\s+\\S+(\\s+\\S+)(\\s+\\S+))?",
PCRE2_ZERO_TERMINATED,
PCRE2_DOLLAR_ENDONLY | PCRE2_DOTALL | PCRE2_CASELESS, &errcode, &erroff, NULL);
if (!c->parse_re || !c->fallback_re)
goto fail2;
cookie_cache_init(&c->cookie_cache);
if (udp_listener_init(&c->udp_listener, ep, control_udp_incoming, &c->obj))
goto fail2;
return c;
fail2:
obj_put(c);
return NULL;
}
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