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Remove resolve_reverse_lookup setting

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This setting seems ill advised and breaks TLS verification.

Fixes #1034.
This commit is contained in:
Will Storey 2019-10-12 17:09:13 -07:00
parent f9db4019af
commit 7e6d24420c
4 changed files with 9 additions and 58 deletions
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42
src/core/net-nonblock.c
View File

@ -27,13 +27,11 @@
/* nonblocking gethostbyname(), ip (IPADDR) + error (int, 0 = not error) is
written to pipe when found PID of the resolver child is returned */
int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
int reverse_lookup)
int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe)
{
RESOLVED_IP_REC rec;
const char *errorstr;
int pid;
int len;
g_return_val_if_fail(addr != NULL, FALSE);
@ -57,13 +55,6 @@ int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
rec.error = net_gethostbyname(addr, &rec.ip4, &rec.ip6);
if (rec.error == 0) {
errorstr = NULL;
if (reverse_lookup) {
/* reverse lookup the IP, ignore any error */
if (rec.ip4.family != 0)
net_gethostbyaddr(&rec.ip4, &rec.host4);
if (rec.ip6.family != 0)
net_gethostbyaddr(&rec.ip6, &rec.host6);
}
} else {
errorstr = net_gethosterror(rec.error);
rec.errlen = errorstr == NULL ? 0 : strlen(errorstr)+1;
@ -72,22 +63,6 @@ int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
g_io_channel_write_block(pipe, &rec, sizeof(rec));
if (rec.errlen != 0)
g_io_channel_write_block(pipe, (void *) errorstr, rec.errlen);
else {
if (rec.host4) {
len = strlen(rec.host4) + 1;
g_io_channel_write_block(pipe, (void *) &len,
sizeof(int));
g_io_channel_write_block(pipe, (void *) rec.host4,
len);
}
if (rec.host6) {
len = strlen(rec.host6) + 1;
g_io_channel_write_block(pipe, (void *) &len,
sizeof(int));
g_io_channel_write_block(pipe, (void *) rec.host6,
len);
}
}
if (pid == 0)
_exit(99);
@ -99,12 +74,8 @@ int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
/* get the resolved IP address */
int net_gethostbyname_return(GIOChannel *pipe, RESOLVED_IP_REC *rec)
{
int len;
rec->error = -1;
rec->errorstr = NULL;
rec->host4 = NULL;
rec->host6 = NULL;
fcntl(g_io_channel_unix_get_fd(pipe), F_SETFL, O_NONBLOCK);
@ -120,17 +91,6 @@ int net_gethostbyname_return(GIOChannel *pipe, RESOLVED_IP_REC *rec)
reason, just ignore it. */
rec->errorstr = g_malloc0(rec->errlen+1);
g_io_channel_read_block(pipe, rec->errorstr, rec->errlen);
} else {
if (rec->host4) {
g_io_channel_read_block(pipe, &len, sizeof(int));
rec->host4 = g_malloc0(len);
g_io_channel_read_block(pipe, rec->host4, len);
}
if (rec->host6) {
g_io_channel_read_block(pipe, &len, sizeof(int));
rec->host6 = g_malloc0(len);
g_io_channel_read_block(pipe, rec->host6, len);
}
}
return 0;

4
src/core/net-nonblock.h
View File

@ -9,12 +9,10 @@ typedef struct {
int errlen; /* error text length */
char *errorstr; /* error string - dynamically allocated, you'll
need to free() it yourself unless it's NULL */
char *host4, *host6; /* dito */
} RESOLVED_IP_REC;
/* nonblocking gethostbyname(), PID of the resolver child is returned. */
int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
int reverse_lookup);
int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe);
/* get the resolved IP address. returns -1 if some error occurred with read() */
int net_gethostbyname_return(GIOChannel *pipe, RESOLVED_IP_REC *rec);

15
src/core/servers.c
View File

@ -261,7 +261,6 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
RESOLVED_IP_REC iprec;
IPADDR *ip;
const char *errormsg;
char *servername = NULL;
g_source_remove(server->connect_tag);
server->connect_tag = -1;
@ -283,11 +282,9 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
} else if (server->connrec->family == AF_INET) {
/* force IPv4 connection */
ip = iprec.ip4.family == 0 ? NULL : &iprec.ip4;
servername = iprec.host4;
} else if (server->connrec->family == AF_INET6) {
/* force IPv6 connection */
ip = iprec.ip6.family == 0 ? NULL : &iprec.ip6;
servername = iprec.host6;
} else {
/* pick the one that was found, or if both do it like
/SET resolve_prefer_ipv6 says. */
@ -295,19 +292,13 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
(iprec.ip6.family != 0 &&
settings_get_bool("resolve_prefer_ipv6"))) {
ip = &iprec.ip6;
servername = iprec.host6;
} else {
ip = &iprec.ip4;
servername = iprec.host4;
}
}
if (ip != NULL) {
/* host lookup ok */
if (servername) {
g_free(server->connrec->address);
server->connrec->address = g_strdup(servername);
}
server_real_connect(server, ip, NULL);
errormsg = NULL;
} else {
@ -333,8 +324,6 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
}
g_free(iprec.errorstr);
g_free(iprec.host4);
g_free(iprec.host6);
}
SERVER_REC *server_connect(SERVER_CONNECT_REC *conn)
@ -418,8 +407,7 @@ int server_start_connect(SERVER_REC *server)
server->connrec->proxy : server->connrec->address;
server->connect_pid =
net_gethostbyname_nonblock(connect_address,
server->connect_pipe[1],
settings_get_bool("resolve_reverse_lookup"));
server->connect_pipe[1]);
server->connect_tag =
g_input_add(server->connect_pipe[0], G_INPUT_READ,
(GInputFunction)
@ -739,7 +727,6 @@ static void sig_chat_protocol_deinit(CHAT_PROTOCOL_REC *proto)
void servers_init(void)
{
settings_add_bool("server", "resolve_prefer_ipv6", FALSE);
settings_add_bool("server", "resolve_reverse_lookup", FALSE);
lookup_servers = servers = NULL;
signal_add("chat protocol deinit", (SIGNAL_FUNC) sig_chat_protocol_deinit);

6
src/core/settings.c
View File

@ -566,6 +566,12 @@ static int backwards_compatibility(const char *module, CONFIG_NODE *node,
return TRUE;
}
}
if (g_strcmp0(module, "core") == 0 &&
g_strcmp0(node->key, "resolve_reverse_lookup") == 0) {
config_node_set_str(mainconfig, parent, node->key, NULL);
config_changed = TRUE;
return TRUE;
}
return new_key != NULL;
}