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res_pjsip_endpoint_identifier_ip.c: Fix apply identify validation.

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The ip_identify_apply() did not validate the configuration for simple
static configuration errors or deal well with address resolution errors.

* Added missing configuration validation checks.
* Fixed address resolution error handling.
* Demoted an error message to a warning since it does not fail applying
the identify object configuration.

Change-Id: I8b519607263fe88e8ce964f526a45359fd362b6e
This commit is contained in:
Richard Mudgett
2018-01-04 12:23:15 -06:00
parent b8271826b3
commit ba57c03740
1 changed files with 45 additions and 18 deletions
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63
res/res_pjsip_endpoint_identifier_ip.c
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@@ -105,7 +105,7 @@ struct ip_identify_match {
struct ast_ha *matches;
/*! \brief Perform SRV resolution of hostnames */
unsigned int srv_lookups;
/*! \brief Hosts to be resolved after applying configuration */
/*! \brief Hosts to be resolved when applying configuration */
struct ao2_container *hosts;
};
@@ -150,8 +150,8 @@ static int header_identify_match_check(void *obj, void *arg, int flags)
c_header = ast_strdupa(identify->match_header);
c_value = strchr(c_header, ':');
if (!c_value) {
ast_log(LOG_WARNING, "Identify '%s' has invalid header_match: No ':' separator found!\n",
ast_sorcery_object_get_id(identify));
/* This should not be possible. The object cannot be created if so. */
ast_assert(0);
return 0;
}
*c_value = '\0';
@@ -161,17 +161,19 @@ static int header_identify_match_check(void *obj, void *arg, int flags)
pj_header_name = pj_str(c_header);
header = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &pj_header_name, NULL);
if (!header) {
ast_debug(3, "SIP message does not contain header '%s'\n", c_header);
ast_debug(3, "Identify '%s': SIP message does not have header '%s'\n",
ast_sorcery_object_get_id(identify),
c_header);
return 0;
}
pj_header_value = pj_str(c_value);
if (pj_strcmp(&pj_header_value, &header->hvalue)) {
ast_debug(3, "SIP message contains header '%s' but value '%.*s' does not match value '%s' for endpoint '%s'\n",
ast_debug(3, "Identify '%s': SIP message has header '%s' but value '%.*s' does not match '%s'\n",
ast_sorcery_object_get_id(identify),
c_header,
(int) pj_strlen(&header->hvalue), pj_strbuf(&header->hvalue),
c_value,
identify->endpoint_name);
c_value);
return 0;
}
@@ -261,7 +263,7 @@ static int ip_identify_match_host_lookup(struct ip_identify_match *identify, con
}
for (i = 0; i < num_addrs; ++i) {
/* Check if the address is already in the list, if so don't bother adding it again */
/* Check if the address is already in the list, if so don't add it again */
if (identify->matches && (ast_apply_ha(identify->matches, &addrs[i]) != AST_SENSE_ALLOW)) {
continue;
}
@@ -283,14 +285,13 @@ static int ip_identify_match_host_lookup(struct ip_identify_match *identify, con
}
/*! \brief Helper function which performs an SRV lookup and then resolves the hostname */
static int ip_identify_match_srv_lookup(struct ip_identify_match *identify, const char *prefix, const char *host)
static int ip_identify_match_srv_lookup(struct ip_identify_match *identify, const char *prefix, const char *host, int results)
{
char service[NI_MAXHOST];
struct srv_context *context = NULL;
int srv_ret;
const char *srvhost;
unsigned short srvport;
int results = 0;
snprintf(service, sizeof(service), "%s.%s", prefix, host);
@@ -372,10 +373,33 @@ static int ip_identify_apply(const struct ast_sorcery *sorcery, void *obj)
char *current_string;
struct ao2_iterator i;
/* Validate the identify object configuration */
if (ast_strlen_zero(identify->endpoint_name)) {
ast_log(LOG_ERROR, "Identify '%s' missing required endpoint name.\n",
ast_sorcery_object_get_id(identify));
return -1;
}
if (ast_strlen_zero(identify->match_header) /* No header to match */
/* and no static IP addresses with a mask */
&& !identify->matches
/* and no addresses to resolve */
&& (!identify->hosts || !ao2_container_count(identify->hosts))) {
ast_log(LOG_ERROR, "Identify '%s' is not configured to match anything.\n",
ast_sorcery_object_get_id(identify));
return -1;
}
if (!ast_strlen_zero(identify->match_header)
&& !strchr(identify->match_header, ':')) {
ast_log(LOG_ERROR, "Identify '%s' missing ':' separator in match_header '%s'.\n",
ast_sorcery_object_get_id(identify), identify->match_header);
return -1;
}
if (!identify->hosts) {
return 0;
}
/* Resolve the match addresses now */
i = ao2_iterator_init(identify->hosts, 0);
while ((current_string = ao2_iterator_next(&i))) {
struct ast_sockaddr address;
@@ -383,26 +407,29 @@ static int ip_identify_apply(const struct ast_sorcery *sorcery, void *obj)
/* If the provided string is not an IP address perform SRV resolution on it */
if (identify->srv_lookups && !ast_sockaddr_parse(&address, current_string, 0)) {
results = ip_identify_match_srv_lookup(identify, "_sip._udp", current_string);
results = ip_identify_match_srv_lookup(identify, "_sip._udp", current_string,
results);
if (results != -1) {
results += ip_identify_match_srv_lookup(identify, "_sip._tcp", current_string);
results = ip_identify_match_srv_lookup(identify, "_sip._tcp",
current_string, results);
}
if (results != -1) {
results += ip_identify_match_srv_lookup(identify, "_sips._tcp", current_string);
results = ip_identify_match_srv_lookup(identify, "_sips._tcp",
current_string, results);
}
}
/* If SRV falls fall back to a normal lookup on the host itself */
/* If SRV fails fall back to a normal lookup on the host itself */
if (!results) {
results = ip_identify_match_host_lookup(identify, current_string);
}
if (results == 0) {
ast_log(LOG_ERROR, "Address '%s' provided on ip endpoint identifier '%s' did not resolve to any address\n",
current_string, ast_sorcery_object_get_id(obj));
ast_log(LOG_WARNING, "Identify '%s' provided address '%s' did not resolve to any address\n",
ast_sorcery_object_get_id(identify), current_string);
} else if (results == -1) {
ast_log(LOG_ERROR, "An error occurred when adding resolution results of '%s' on '%s'\n",
current_string, ast_sorcery_object_get_id(obj));
ast_log(LOG_ERROR, "Identify '%s' failed when adding resolution results of '%s'\n",
ast_sorcery_object_get_id(identify), current_string);
ao2_ref(current_string, -1);
ao2_iterator_destroy(&i);
return -1;