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Convert chan_iax2 to use dnsmgr in order to deal with hostnames that can change their resolved IP (aka dynamic dns setups) (issue #6305 reported and fixed by ivanfm)

Browse Source 
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@32304 65c4cc65-6c06-0410-ace0-fbb531ad65f3
1.4
Joshua Colp 20 years ago
parent 723e900bf3
commit 2a71835d41
3 changed files with 106 additions and 51 deletions
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85
channels/chan_iax2.c
Unescape View File

@ -416,6 +416,7 @@ struct iax2_registry {
int callno; /*!< Associated call number if applicable */
struct sockaddr_in us; /*!< Who the server thinks we are */
struct iax2_registry *next;
struct ast_dnsmgr_entry *dnsmgr; /*!< DNS refresh manager */
};
static struct iax2_registry *registrations;
@ -1894,7 +1895,7 @@ static int iax2_prune_realtime(int fd, int argc, char *argv[])
} else if ((peer = find_peer(argv[3], 0))) {
if(ast_test_flag(peer, IAX_RTCACHEFRIENDS)) {
ast_set_flag(peer, IAX_RTAUTOCLEAR);
expire_registry(peer->name);
expire_registry(peer);
ast_cli(fd, "OK peer %s was removed from the cache.\n", argv[3]);
} else {
ast_cli(fd, "SORRY peer %s is not eligible for this operation.\n", argv[3]);
@ -2532,7 +2533,7 @@ static struct iax2_peer *realtime_peer(const char *peername, struct sockaddr_in
if (ast_test_flag(peer, IAX_RTAUTOCLEAR)) {
if (peer->expire > -1)
ast_sched_del(sched, peer->expire);
peer->expire = ast_sched_add(sched, (global_rtautoclear) * 1000, expire_registry, (void*)peer->name);
peer->expire = ast_sched_add(sched, (global_rtautoclear) * 1000, expire_registry, (void*)peer);
}
AST_LIST_LOCK(&peers);
AST_LIST_INSERT_HEAD(&peers, peer, entry);
@ -4304,8 +4305,8 @@ static char *regstate2str(int regstate)
static int iax2_show_registry(int fd, int argc, char *argv[])
{
#define FORMAT2 "%-20.20s %-10.10s %-20.20s %8.8s %s\n"
#define FORMAT "%-20.20s %-10.10s %-20.20s %8d %s\n"
#define FORMAT2 "%-20.20s %-6.6s %-10.10s %-20.20s %8.8s %s\n"
#define FORMAT "%-20.20s %-6.6s %-10.10s %-20.20s %8d %s\n"
struct iax2_registry *reg = NULL;
char host[80];
@ -4314,7 +4315,7 @@ static int iax2_show_registry(int fd, int argc, char *argv[])
if (argc != 3)
return RESULT_SHOWUSAGE;
AST_LIST_LOCK(&peers);
ast_cli(fd, FORMAT2, "Host", "Username", "Perceived", "Refresh", "State");
ast_cli(fd, FORMAT2, "Host", "dnsmgr", "Username", "Perceived", "Refresh", "State");
for (reg = registrations;reg;reg = reg->next) {
snprintf(host, sizeof(host), "%s:%d", ast_inet_ntoa(iabuf, sizeof(iabuf), reg->addr.sin_addr), ntohs(reg->addr.sin_port));
if (reg->us.sin_addr.s_addr)
@ -4322,6 +4323,7 @@ static int iax2_show_registry(int fd, int argc, char *argv[])
else
ast_copy_string(perceived, "<Unregistered>", sizeof(perceived));
ast_cli(fd, FORMAT, host,
(reg->dnsmgr) ? "Y" : "N",
reg->username, perceived, reg->refresh, regstate2str(reg->regstate));
}
AST_LIST_UNLOCK(&peers);
@ -5447,7 +5449,6 @@ static int iax2_register(char *value, int lineno)
char *porta;
char *stringp=NULL;
struct ast_hostent ahp; struct hostent *hp;
if (!value)
return -1;
ast_copy_string(copy, value, sizeof(copy));
@ -5469,20 +5470,18 @@ static int iax2_register(char *value, int lineno)
ast_log(LOG_WARNING, "%s is not a valid port number at line %d\n", porta, lineno);
return -1;
}
hp = ast_gethostbyname(hostname, &ahp);
if (!hp) {
ast_log(LOG_WARNING, "Host '%s' not found at line %d\n", hostname, lineno);
return -1;
}
if (!(reg = ast_calloc(1, sizeof(*reg))))
return -1;
if (ast_dnsmgr_lookup(hostname, &reg->addr.sin_addr, &reg->dnsmgr) < 0) {
free(reg);
return -1;
}
ast_copy_string(reg->username, username, sizeof(reg->username));
if (secret)
ast_copy_string(reg->secret, secret, sizeof(reg->secret));
reg->expire = -1;
reg->refresh = IAX_DEFAULT_REG_EXPIRE;
reg->addr.sin_family = AF_INET;
memcpy(&reg->addr.sin_addr, hp->h_addr, sizeof(&reg->addr.sin_addr));
reg->addr.sin_port = porta ? htons(atoi(porta)) : htons(IAX_DEFAULT_PORTNO);
reg->next = registrations;
reg->callno = 0;
@ -5512,26 +5511,7 @@ static void prune_peers(void);
static void __expire_registry(void *data)
{
char *name = data;
struct iax2_peer *p = NULL;
/* Go through and grab this peer... and if it needs to be removed... then do it */
AST_LIST_LOCK(&peers);
AST_LIST_TRAVERSE_SAFE_BEGIN(&peers, p, entry) {
if (!strcasecmp(p->name, name)) {
/* If we are set to auto clear then remove ourselves */
if (ast_test_flag(p, IAX_RTAUTOCLEAR))
AST_LIST_REMOVE_CURRENT(&peers, entry);
p->expire = -1;
break;
}
}
AST_LIST_TRAVERSE_SAFE_END
AST_LIST_UNLOCK(&peers);
/* Peer is already gone for whatever reason */
if (!p)
return;
struct iax2_peer *p = data;
ast_log(LOG_DEBUG, "Expiring registration for peer '%s'\n", p->name);
manager_event(EVENT_FLAG_SYSTEM, "PeerStatus", "Peer: IAX2/%s\r\nPeerStatus: Unregistered\r\nCause: Expired\r\n", p->name);
@ -5548,16 +5528,18 @@ static void __expire_registry(void *data)
if (ast_test_flag(p, IAX_RTAUTOCLEAR)) {
/* We are already gone from the list, so we can just destroy ourselves */
AST_LIST_LOCK(&peers);
AST_LIST_REMOVE(&peers, p, entry);
AST_LIST_UNLOCK(&peers);
destroy_peer(p);
}
}
static int expire_registry(void *data)
{
#ifdef SCHED_MULTITHREADED
if (schedule_action(__expire_registry, data))
#endif
__expire_registry(data);
struct iax2_peer *p = data;
p->expire = -1;
__expire_registry(p);
return 0;
}
@ -5591,7 +5573,7 @@ static void reg_source_db(struct iax2_peer *p)
if (p->expire > -1)
ast_sched_del(sched, p->expire);
ast_device_state_changed("IAX2/%s", p->name); /* Activate notification */
p->expire = ast_sched_add(sched, (p->expiry + 10) * 1000, expire_registry, (void *)p->name);
p->expire = ast_sched_add(sched, (p->expiry + 10) * 1000, expire_registry, (void *)p);
if (iax2_regfunk)
iax2_regfunk(p->name, 1);
register_peer_exten(p, 1);
@ -5669,7 +5651,7 @@ static int update_registry(char *name, struct sockaddr_in *sin, int callno, char
p->expiry = refresh;
}
if (p->expiry && sin->sin_addr.s_addr)
p->expire = ast_sched_add(sched, (p->expiry + 10) * 1000, expire_registry, (void *)p->name);
p->expire = ast_sched_add(sched, (p->expiry + 10) * 1000, expire_registry, (void *)p);
iax_ie_append_str(&ied, IAX_IE_USERNAME, p->name);
iax_ie_append_int(&ied, IAX_IE_DATETIME, iax2_datetime(p->zonetag));
if (sin->sin_addr.s_addr) {
@ -7741,6 +7723,31 @@ static int iax2_do_register(struct iax2_registry *reg)
struct iax_ie_data ied;
if (option_debug && iaxdebug)
ast_log(LOG_DEBUG, "Sending registration request for '%s'\n", reg->username);
if (reg->dnsmgr &&
((reg->regstate == REG_STATE_TIMEOUT) || !reg->addr.sin_addr.s_addr)) {
/* Maybe the IP has changed, force DNS refresh */
ast_dnsmgr_refresh(reg->dnsmgr, 1);
}
/*
* if IP has Changed, free allocated call to create a new one with new IP
* call has the pointer to IP and must be updated to the new one
*/
if (reg->dnsmgr && ast_dnsmgr_changed(reg->dnsmgr) && (reg->callno > 0)) {
iax2_destroy(reg->callno);
reg->callno = 0;
}
if (!reg->addr.sin_addr.s_addr) {
if (option_debug && iaxdebug)
ast_log(LOG_DEBUG, "Unable to send registration request for '%s' without IP address\n", reg->username);
/* Setup the next registration attempt */
if (reg->expire > -1)
ast_sched_del(sched, reg->expire);
reg->expire = ast_sched_add(sched, (5 * reg->refresh / 6) * 1000, iax2_do_register_s, reg);
return -1;
}
if (!reg->callno) {
if (option_debug)
ast_log(LOG_DEBUG, "Allocate call number\n");
@ -8633,6 +8640,8 @@ static void delete_users(void)
}
ast_mutex_unlock(&iaxsl[regl->callno]);
}
if (regl->dnsmgr)
ast_dnsmgr_release(regl->dnsmgr);
free(regl);
}
registrations = NULL;

68
dnsmgr.c
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@ -53,9 +53,11 @@ static int refresh_sched = -1;
static pthread_t refresh_thread = AST_PTHREADT_NULL;
struct ast_dnsmgr_entry {
struct in_addr *result;
struct in_addr *result; /* where we will store the resulting address */
struct in_addr last; /* the last result, used to check if address has changed */
int changed;
AST_LIST_ENTRY(ast_dnsmgr_entry) list;
char name[1];
char name[1]; /* just 1 here, but we use calloc to allocate the correct size */
};
static AST_LIST_HEAD_STATIC(entry_list, ast_dnsmgr_entry);
@ -104,6 +106,8 @@ void ast_dnsmgr_release(struct ast_dnsmgr_entry *entry)
AST_LIST_LOCK(&entry_list);
AST_LIST_REMOVE(&entry_list, entry, list);
AST_LIST_UNLOCK(&entry_list);
if (option_verbose > 4)
ast_verbose(VERBOSE_PREFIX_4 "removing dns manager for '%s'\n", entry->name);
free(entry);
}
@ -116,7 +120,7 @@ int ast_dnsmgr_lookup(const char *name, struct in_addr *result, struct ast_dnsmg
return 0;
if (option_verbose > 3)
ast_verbose(VERBOSE_PREFIX_3 "doing lookup for '%s'\n", name);
ast_verbose(VERBOSE_PREFIX_3 "doing dnsmgr_lookup for '%s'\n", name);
/* if it's actually an IP address and not a name,
there's no need for a managed lookup */
@ -134,12 +138,58 @@ int ast_dnsmgr_lookup(const char *name, struct in_addr *result, struct ast_dnsmg
return 0;
} else {
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_2 "adding manager for '%s'\n", name);
ast_verbose(VERBOSE_PREFIX_2 "adding dns manager for '%s'\n", name);
*dnsmgr = ast_dnsmgr_get(name, result);
return !*dnsmgr;
}
}
/*
* Refresh a dnsmgr entry
*
* XXX maybe we must lock the entry to make safer
*/
int ast_dnsmgr_refresh(struct ast_dnsmgr_entry *entry, int verbose)
{
struct ast_hostent ahp;
struct hostent *hp;
char iabuf[INET_ADDRSTRLEN];
char iabuf2[INET_ADDRSTRLEN];
struct in_addr tmp;
if (verbose && (option_verbose > 2))
ast_verbose(VERBOSE_PREFIX_2 "refreshing '%s'\n", entry->name);
if ((hp = ast_gethostbyname(entry->name, &ahp))) {
/* check to see if it has changed, do callback if requested (where de callback is defined ????) */
memcpy(&tmp, hp->h_addr, sizeof(tmp));
if (tmp.s_addr != entry->last.s_addr) {
ast_log(LOG_NOTICE, "host '%s' changed from %s to %s\n",
entry->name,
ast_inet_ntoa(iabuf, sizeof(iabuf), entry->last),
ast_inet_ntoa(iabuf2, sizeof(iabuf2), tmp));
memcpy(entry->result, hp->h_addr, sizeof(entry->result));
memcpy(&entry->last, hp->h_addr, sizeof(entry->last));
entry->changed = 1;
return 1;
}
}
return 0;
}
/*
* Check if dnsmgr entry has changed from since last call to this function
*/
int ast_dnsmgr_changed(struct ast_dnsmgr_entry *entry)
{
int ret = entry->changed;
entry->changed = 0;
return ret;
}
static void *do_refresh(void *data)
{
for (;;) {
@ -155,8 +205,6 @@ static int refresh_list(void *data)
{
struct refresh_info *info = data;
struct ast_dnsmgr_entry *entry;
struct ast_hostent ahp;
struct hostent *hp;
/* if a refresh or reload is already in progress, exit now */
if (ast_mutex_trylock(&refresh_lock)) {
@ -172,13 +220,7 @@ static int refresh_list(void *data)
if (info->regex_present && regexec(&info->filter, entry->name, 0, NULL, 0))
continue;
if (info->verbose && (option_verbose > 2))
ast_verbose(VERBOSE_PREFIX_2 "refreshing '%s'\n", entry->name);
if ((hp = ast_gethostbyname(entry->name, &ahp))) {
/* check to see if it has changed, do callback if requested */
memcpy(entry->result, hp->h_addr, sizeof(entry->result));
}
ast_dnsmgr_refresh(entry, info->verbose);
}
AST_LIST_UNLOCK(info->entries);

4
include/asterisk/dnsmgr.h
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@ -37,6 +37,10 @@ void ast_dnsmgr_release(struct ast_dnsmgr_entry *entry);
int ast_dnsmgr_lookup(const char *name, struct in_addr *result, struct ast_dnsmgr_entry **dnsmgr);
int ast_dnsmgr_refresh(struct ast_dnsmgr_entry *entry, int verbose);
int ast_dnsmgr_changed(struct ast_dnsmgr_entry *entry);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif /* c_plusplus */

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