pidgin/pidgin

Enable cyrus-sasl support by default
release-2.x.y
2020-07-13, Gary Kramlich
2e4b62844623
Enable cyrus-sasl support by default

Testing Done:
Built and followed the sasl instructions on freenode's site https://freenode.net/kb/answer/pidgin and connected and identified me to nickserv just fine. Also I checked Debian and they're manually enabling this so if there was an issue users were seeing we would have heard about it by now as this line was last changed in 2013.

Reviewed at https://reviews.imfreedom.org/r/26/
/**
* @file dnssrv.c
*/
/* purple
*
* Copyright (C) 2005 Thomas Butter <butter@uni-mannheim.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#define _PURPLE_DNSSRV_C_
#include "internal.h"
#include "util.h"
#ifndef _WIN32
#include <arpa/nameser.h>
#include <resolv.h>
#ifdef HAVE_ARPA_NAMESER_COMPAT_H
#include <arpa/nameser_compat.h>
#endif
#else /* WIN32 */
#include <windns.h>
/* Missing from the mingw headers */
#ifndef DNS_TYPE_SRV
# define DNS_TYPE_SRV PurpleDnsTypeSrv
#endif
#ifndef DNS_TYPE_TXT
# define DNS_TYPE_TXT PurpleDnsTypeTxt
#endif
#endif
#ifndef T_SRV
#define T_SRV PurpleDnsTypeSrv
#endif
#ifndef T_TXT
#define T_TXT PurpleDnsTypeTxt
#endif
#define MAX_ADDR_RESPONSE_LEN 1048576
#include "debug.h"
#include "dnssrv.h"
#include "eventloop.h"
#include "network.h"
static PurpleSrvTxtQueryUiOps *srv_txt_query_ui_ops = NULL;
#ifndef _WIN32
typedef union {
HEADER hdr;
u_char buf[1024];
} queryans;
#endif
struct _PurpleSrvTxtQueryData {
union {
PurpleSrvCallback srv;
PurpleTxtCallback txt;
} cb;
gpointer extradata;
guint handle;
int type;
char *query;
#ifdef _WIN32
GThread *resolver;
char *error_message;
GList *results;
#else
int fd_in, fd_out;
pid_t pid;
#endif
};
typedef struct _PurpleSrvInternalQuery {
int type;
char query[256];
} PurpleSrvInternalQuery;
typedef struct _PurpleSrvResponseContainer {
PurpleSrvResponse *response;
int sum;
} PurpleSrvResponseContainer;
static gboolean purple_srv_txt_query_ui_resolve(PurpleSrvTxtQueryData *query_data);
/**
* Sort by priority, then by weight. Strictly numerically--no
* randomness. Technically we only need to sort by pref and then
* make sure any records with weight 0 are at the beginning of
* their group, but it's just as easy to sort by weight.
*/
static gint
responsecompare(gconstpointer ar, gconstpointer br)
{
PurpleSrvResponse *a = (PurpleSrvResponse*)ar;
PurpleSrvResponse *b = (PurpleSrvResponse*)br;
if(a->pref == b->pref) {
if(a->weight == b->weight)
return 0;
if(a->weight < b->weight)
return -1;
return 1;
}
if(a->pref < b->pref)
return -1;
return 1;
}
/**
* Iterate over a list of PurpleSrvResponseContainer making the sum
* the running total of the sums. Select a random integer in the range
* (1, sum+1), then find the first element greater than or equal to the
* number selected. From RFC 2782.
*
* @param list The list of PurpleSrvResponseContainer. This function
* removes a node from this list and returns the new list.
* @param container_ptr The PurpleSrvResponseContainer that was chosen
* will be returned here.
*/
static GList *
select_random_response(GList *list, PurpleSrvResponseContainer **container_ptr)
{
GList *cur;
size_t runningtotal;
int r;
runningtotal = 0;
cur = list;
while (cur) {
PurpleSrvResponseContainer *container = cur->data;
runningtotal += container->response->weight;
container->sum = runningtotal;
cur = cur->next;
}
/*
* If the running total is greater than 0, pick a number between
* 1 and the runningtotal inclusive. (This is not precisely what
* the RFC algorithm describes, but we wish to deal with integers
* and avoid floats. This is functionally equivalent.)
* If running total is 0, then choose r = 0.
*/
r = runningtotal ? g_random_int_range(1, runningtotal + 1) : 0;
cur = list;
while (r > ((PurpleSrvResponseContainer *)cur->data)->sum) {
cur = cur->next;
}
/* Set the return parameter and remove cur from the list */
*container_ptr = cur->data;
return g_list_delete_link(list, cur);
}
/**
* Reorder a GList of PurpleSrvResponses that have the same priority
* (aka "pref").
*/
static void
srv_reorder(GList *list, int num)
{
int i;
GList *cur, *container_list = NULL;
PurpleSrvResponseContainer *container;
if (num < 2)
/* Nothing to sort */
return;
/* First build a list of container structs */
for (i = 0, cur = list; i < num; i++, cur = cur->next) {
container = g_new(PurpleSrvResponseContainer, 1);
container->response = cur->data;
container_list = g_list_prepend(container_list, container);
}
container_list = g_list_reverse(container_list);
/*
* Re-order the list that was passed in as a parameter. We leave
* the list nodes in place, but replace their data pointers.
*/
cur = list;
while (container_list) {
container_list = select_random_response(container_list, &container);
cur->data = container->response;
g_free(container);
cur = cur->next;
}
}
/**
* Sorts a GList of PurpleSrvResponses according to the
* algorithm described in RFC 2782.
*
* @param response GList of PurpleSrvResponse's
* @param The original list, resorted
*/
static GList *
purple_srv_sort(GList *list)
{
int pref, count;
GList *cur, *start;
if (!list || !list->next) {
/* Nothing to sort */
return list;
}
list = g_list_sort(list, responsecompare);
start = cur = list;
count = 1;
while (cur) {
PurpleSrvResponse *next_response;
pref = ((PurpleSrvResponse *)cur->data)->pref;
next_response = cur->next ? cur->next->data : NULL;
if (!next_response || next_response->pref != pref) {
/*
* The 'count' records starting at 'start' all have the same
* priority. Sort them by weight.
*/
srv_reorder(start, count);
start = cur->next;
count = 0;
}
count++;
cur = cur->next;
}
return list;
}
static PurpleSrvTxtQueryData *
query_data_new(int type, gchar *query, gpointer extradata)
{
PurpleSrvTxtQueryData *query_data = g_new0(PurpleSrvTxtQueryData, 1);
query_data->type = type;
query_data->extradata = extradata;
query_data->query = query;
#ifndef _WIN32
query_data->fd_in = -1;
query_data->fd_out = -1;
#endif
return query_data;
}
void
purple_srv_txt_query_destroy(PurpleSrvTxtQueryData *query_data)
{
PurpleSrvTxtQueryUiOps *ops = purple_srv_txt_query_get_ui_ops();
if (ops && ops->destroy)
ops->destroy(query_data);
if (query_data->handle > 0)
purple_input_remove(query_data->handle);
#ifdef _WIN32
if (query_data->resolver != NULL)
{
/*
* It's not really possible to kill a thread. So instead we
* just set the callback to NULL and let the DNS lookup
* finish.
*/
query_data->cb.srv = NULL;
return;
}
g_free(query_data->error_message);
#else
if (query_data->fd_out != -1)
close(query_data->fd_out);
if (query_data->fd_in != -1)
close(query_data->fd_in);
#endif
g_free(query_data->query);
g_free(query_data);
}
#ifdef USE_IDN
static gboolean
dns_str_is_ascii(const char *name)
{
guchar *c;
for (c = (guchar *)name; c && *c; ++c) {
if (*c > 0x7f)
return FALSE;
}
return TRUE;
}
#endif
#ifndef _WIN32
static void
write_to_parent(int in, int out, gconstpointer data, gsize size)
{
const guchar *buf = data;
gssize w;
do {
w = write(out, buf, size);
if (w > 0) {
buf += w;
size -= w;
} else if (w < 0 && errno == EINTR) {
/* Let's try some more; */
w = 1;
}
} while (size > 0 && w > 0);
if (size != 0) {
/* An error occurred */
close(out);
close(in);
_exit(0);
}
}
/* Read size bytes to data. Dies if an error occurs. */
static void
read_from_parent(int in, int out, gpointer data, gsize size)
{
guchar *buf = data;
gssize r;
do {
r = read(in, data, size);
if (r > 0) {
buf += r;
size -= r;
} else if (r < 0 && errno == EINTR) {
/* Let's try some more; */
r = 1;
}
} while (size > 0 && r > 0);
if (size != 0) {
/* An error occurred */
close(out);
close(in);
_exit(0);
}
}
G_GNUC_NORETURN static void
resolve(int in, int out)
{
GList *ret = NULL;
PurpleSrvResponse *srvres;
PurpleTxtResponse *txtres;
queryans answer;
int size, qdcount, ancount;
guchar *end, *cp;
gchar name[256];
guint16 type, dlen, pref, weight, port;
PurpleSrvInternalQuery query;
#ifdef HAVE_SIGNAL_H
purple_restore_default_signal_handlers();
#endif
read_from_parent(in, out, &query, sizeof(query));
size = res_query( query.query, C_IN, query.type, (u_char*)&answer, sizeof( answer));
if (size == -1) {
write_to_parent(in, out, &(query.type), sizeof(query.type));
write_to_parent(in, out, &size, sizeof(size));
close(out);
close(in);
_exit(0);
}
qdcount = ntohs(answer.hdr.qdcount);
ancount = ntohs(answer.hdr.ancount);
cp = (guchar*)&answer + sizeof(HEADER);
end = (guchar*)&answer + size;
/* skip over unwanted stuff */
while (qdcount-- > 0 && cp < end) {
size = dn_expand( (unsigned char*)&answer, end, cp, name, 256);
if(size < 0) goto end;
cp += size + QFIXEDSZ;
}
while (ancount-- > 0 && cp < end) {
size = dn_expand((unsigned char*)&answer, end, cp, name, 256);
if(size < 0)
goto end;
cp += size;
GETSHORT(type,cp);
/* skip ttl and class since we already know it */
cp += 6;
GETSHORT(dlen,cp);
if (type == T_SRV) {
GETSHORT(pref,cp);
GETSHORT(weight,cp);
GETSHORT(port,cp);
size = dn_expand( (unsigned char*)&answer, end, cp, name, 256);
if(size < 0 )
goto end;
cp += size;
srvres = g_new0(PurpleSrvResponse, 1);
if (strlen(name) > sizeof(srvres->hostname) - 1) {
purple_debug_error("dnssrv", "hostname is longer than available buffer ('%s', %zd bytes)!",
name, strlen(name));
}
g_strlcpy(srvres->hostname, name, sizeof(srvres->hostname));
srvres->pref = pref;
srvres->port = port;
srvres->weight = weight;
ret = g_list_prepend(ret, srvres);
} else if (type == T_TXT) {
txtres = g_new0(PurpleTxtResponse, 1);
txtres->content = g_strndup((gchar*)(++cp), dlen-1);
ret = g_list_append(ret, txtres);
cp += dlen - 1;
} else {
cp += dlen;
}
}
end:
size = g_list_length(ret);
if (query.type == T_SRV)
ret = purple_srv_sort(ret);
write_to_parent(in, out, &(query.type), sizeof(query.type));
write_to_parent(in, out, &size, sizeof(size));
while (ret != NULL)
{
if (query.type == T_SRV)
write_to_parent(in, out, ret->data, sizeof(PurpleSrvResponse));
if (query.type == T_TXT) {
PurpleTxtResponse *response = ret->data;
gsize l = strlen(response->content) + 1 /* null byte */;
write_to_parent(in, out, &l, sizeof(l));
write_to_parent(in, out, response->content, l);
}
g_free(ret->data);
ret = g_list_remove(ret, ret->data);
}
close(out);
close(in);
_exit(0);
}
static void
resolved(gpointer data, gint source, PurpleInputCondition cond)
{
int size;
int type;
PurpleSrvTxtQueryData *query_data = (PurpleSrvTxtQueryData*)data;
int i;
int status;
if (read(source, &type, sizeof(type)) == sizeof(type)) {
if (read(source, &size, sizeof(size)) == sizeof(size)) {
if (size < -1 || size > MAX_ADDR_RESPONSE_LEN) {
purple_debug_warning("dnssrv", "res_query returned invalid number\n");
size = 0;
}
if (size == -1 || size == 0) {
if (size == -1) {
purple_debug_warning("dnssrv", "res_query returned an error\n");
/* Re-read resolv.conf and friends in case DNS servers have changed */
res_init();
} else
purple_debug_info("dnssrv", "Found 0 entries, errno is %i\n", errno);
if (type == T_SRV) {
PurpleSrvCallback cb = query_data->cb.srv;
cb(NULL, 0, query_data->extradata);
} else if (type == T_TXT) {
PurpleTxtCallback cb = query_data->cb.txt;
cb(NULL, query_data->extradata);
} else {
purple_debug_error("dnssrv", "type unknown of DNS result entry; errno is %i\n", errno);
}
} else if (size) {
if (type == T_SRV) {
PurpleSrvResponse *res;
PurpleSrvResponse *tmp;
PurpleSrvCallback cb = query_data->cb.srv;
ssize_t red;
purple_debug_info("dnssrv","found %d SRV entries\n", size);
tmp = res = g_new0(PurpleSrvResponse, size);
for (i = 0; i < size; i++) {
red = read(source, tmp++, sizeof(PurpleSrvResponse));
if (red != sizeof(PurpleSrvResponse)) {
purple_debug_error("dnssrv","unable to read srv "
"response: %s\n", g_strerror(errno));
size = 0;
g_free(res);
res = NULL;
}
}
cb(res, size, query_data->extradata);
} else if (type == T_TXT) {
GList *responses = NULL;
PurpleTxtResponse *res;
PurpleTxtCallback cb = query_data->cb.txt;
ssize_t red;
purple_debug_info("dnssrv","found %d TXT entries\n", size);
for (i = 0; i < size; i++) {
gsize len;
red = read(source, &len, sizeof(len));
if (red != sizeof(len)) {
purple_debug_error("dnssrv","unable to read txt "
"response length: %s\n", g_strerror(errno));
size = 0;
g_list_foreach(responses, (GFunc)purple_txt_response_destroy, NULL);
g_list_free(responses);
responses = NULL;
break;
}
if (len > MAX_ADDR_RESPONSE_LEN) {
purple_debug_error("dnssrv", "we've read invalid number\n");
size = 0;
g_list_foreach(responses, (GFunc)purple_txt_response_destroy, NULL);
g_list_free(responses);
responses = NULL;
break;
}
res = g_new0(PurpleTxtResponse, 1);
res->content = g_new0(gchar, len);
red = read(source, res->content, len);
if (red < 0 || (gsize)red != len) {
purple_debug_error("dnssrv","unable to read txt "
"response: %s\n", g_strerror(errno));
size = 0;
purple_txt_response_destroy(res);
g_list_foreach(responses, (GFunc)purple_txt_response_destroy, NULL);
g_list_free(responses);
responses = NULL;
break;
}
responses = g_list_prepend(responses, res);
}
responses = g_list_reverse(responses);
cb(responses, query_data->extradata);
} else {
purple_debug_error("dnssrv", "type unknown of DNS result entry; errno is %i\n", errno);
}
}
}
}
waitpid(query_data->pid, &status, 0);
purple_srv_txt_query_destroy(query_data);
}
#else /* _WIN32 */
/** The Jabber Server code was inspiration for parts of this. */
static gboolean
res_main_thread_cb(gpointer data)
{
PurpleSrvResponse *srvres = NULL;
PurpleSrvTxtQueryData *query_data = data;
if(query_data->error_message != NULL) {
purple_debug_error("dnssrv", "%s", query_data->error_message);
if (query_data->type == DNS_TYPE_SRV) {
if (query_data->cb.srv)
query_data->cb.srv(srvres, 0, query_data->extradata);
} else if (query_data->type == DNS_TYPE_TXT) {
if (query_data->cb.txt)
query_data->cb.txt(NULL, query_data->extradata);
}
} else {
if (query_data->type == DNS_TYPE_SRV) {
PurpleSrvResponse *srvres_tmp = NULL;
GList *lst = query_data->results;
int size = g_list_length(lst);
if(query_data->cb.srv && size > 0)
srvres_tmp = srvres = g_new0(PurpleSrvResponse, size);
while (lst) {
PurpleSrvResponse *lstdata = lst->data;
lst = g_list_delete_link(lst, lst);
if(query_data->cb.srv)
memcpy(srvres_tmp++, lstdata, sizeof(PurpleSrvResponse));
g_free(lstdata);
}
query_data->results = NULL;
purple_debug_info("dnssrv", "found %d SRV entries\n", size);
if(query_data->cb.srv) query_data->cb.srv(srvres, size, query_data->extradata);
} else if (query_data->type == DNS_TYPE_TXT) {
GList *lst = query_data->results;
purple_debug_info("dnssrv", "found %d TXT entries\n", g_list_length(lst));
if (query_data->cb.txt) {
query_data->results = NULL;
query_data->cb.txt(lst, query_data->extradata);
}
} else {
purple_debug_error("dnssrv", "unknown query type");
}
}
query_data->resolver = NULL;
query_data->handle = 0;
purple_srv_txt_query_destroy(query_data);
return FALSE;
}
static gpointer
res_thread(gpointer data)
{
PDNS_RECORD dr = NULL;
int type;
DNS_STATUS ds;
PurpleSrvTxtQueryData *query_data = data;
type = query_data->type;
ds = DnsQuery_UTF8(query_data->query, type, DNS_QUERY_STANDARD, NULL, &dr, NULL);
if (ds != ERROR_SUCCESS) {
gchar *msg = g_win32_error_message(ds);
if (type == DNS_TYPE_SRV) {
query_data->error_message = g_strdup_printf("Couldn't look up SRV record. %s (%lu).\n", msg, ds);
} else if (type == DNS_TYPE_TXT) {
query_data->error_message = g_strdup_printf("Couldn't look up TXT record. %s (%lu).\n", msg, ds);
}
g_free(msg);
} else {
if (type == DNS_TYPE_SRV) {
PDNS_RECORD dr_tmp;
GList *lst = NULL;
DNS_SRV_DATA *srv_data;
PurpleSrvResponse *srvres;
for (dr_tmp = dr; dr_tmp != NULL; dr_tmp = dr_tmp->pNext) {
/* Discard any incorrect entries. I'm not sure if this is necessary */
if (dr_tmp->wType != type || !purple_strequal(dr_tmp->pName, query_data->query)) {
continue;
}
srv_data = &dr_tmp->Data.SRV;
srvres = g_new0(PurpleSrvResponse, 1);
strncpy(srvres->hostname, srv_data->pNameTarget, 255);
srvres->hostname[255] = '\0';
srvres->pref = srv_data->wPriority;
srvres->port = srv_data->wPort;
srvres->weight = srv_data->wWeight;
lst = g_list_prepend(lst, srvres);
}
DnsRecordListFree(dr, DnsFreeRecordList);
query_data->results = purple_srv_sort(lst);
} else if (type == DNS_TYPE_TXT) {
PDNS_RECORD dr_tmp;
GList *lst = NULL;
DNS_TXT_DATA *txt_data;
PurpleTxtResponse *txtres;
for (dr_tmp = dr; dr_tmp != NULL; dr_tmp = dr_tmp->pNext) {
GString *s;
int i;
/* Discard any incorrect entries. I'm not sure if this is necessary */
if (dr_tmp->wType != type || !purple_strequal(dr_tmp->pName, query_data->query)) {
continue;
}
txt_data = &dr_tmp->Data.TXT;
txtres = g_new0(PurpleTxtResponse, 1);
s = g_string_new("");
for (i = 0; i < txt_data->dwStringCount; ++i)
s = g_string_append(s, txt_data->pStringArray[i]);
txtres->content = g_string_free(s, FALSE);
lst = g_list_append(lst, txtres);
}
DnsRecordListFree(dr, DnsFreeRecordList);
query_data->results = lst;
} else {
}
}
/* back to main thread */
/* Note: this should *not* be attached to query_data->handle - it will cause leakage */
purple_timeout_add(0, res_main_thread_cb, query_data);
g_thread_exit(NULL);
return NULL;
}
#endif
PurpleSrvTxtQueryData *
purple_srv_resolve(const char *protocol, const char *transport,
const char *domain, PurpleSrvCallback cb, gpointer extradata)
{
return purple_srv_resolve_account(NULL, protocol, transport, domain,
cb, extradata);
}
PurpleSrvTxtQueryData *
purple_srv_resolve_account(PurpleAccount *account, const char *protocol,
const char *transport, const char *domain, PurpleSrvCallback cb,
gpointer extradata)
{
char *query;
char *hostname;
PurpleSrvTxtQueryData *query_data;
PurpleProxyType proxy_type;
#ifndef _WIN32
PurpleSrvInternalQuery internal_query;
int in[2], out[2];
int pid;
#else
GError* err = NULL;
#endif
if (!protocol || !*protocol || !transport || !*transport || !domain || !*domain) {
purple_debug_error("dnssrv", "Wrong arguments\n");
cb(NULL, 0, extradata);
g_return_val_if_reached(NULL);
}
proxy_type = purple_proxy_info_get_type(
purple_proxy_get_setup(account));
if (proxy_type == PURPLE_PROXY_TOR) {
purple_debug_info("dnssrv", "Aborting SRV lookup in Tor Proxy mode.\n");
cb(NULL, 0, extradata);
return NULL;
}
#ifdef USE_IDN
if (!dns_str_is_ascii(domain)) {
int ret = purple_network_convert_idn_to_ascii(domain, &hostname);
if (ret != 0) {
purple_debug_error("dnssrv", "IDNA ToASCII failed\n");
cb(NULL, 0, extradata);
return NULL;
}
} else /* Fallthru is intentional */
#endif
hostname = g_strdup(domain);
query = g_strdup_printf("_%s._%s.%s", protocol, transport, hostname);
purple_debug_info("dnssrv","querying SRV record for %s: %s\n", domain,
query);
g_free(hostname);
query_data = query_data_new(PurpleDnsTypeSrv, query, extradata);
query_data->cb.srv = cb;
if (purple_srv_txt_query_ui_resolve(query_data))
{
return query_data;
}
#ifndef _WIN32
if(pipe(in) || pipe(out)) {
purple_debug_error("dnssrv", "Could not create pipe\n");
g_free(query);
g_free(query_data);
cb(NULL, 0, extradata);
return NULL;
}
pid = fork();
if (pid == -1) {
purple_debug_error("dnssrv", "Could not create process!\n");
g_free(query);
g_free(query_data);
cb(NULL, 0, extradata);
return NULL;
}
/* Child */
if (pid == 0)
{
g_free(query);
g_free(query_data);
close(out[0]);
close(in[1]);
resolve(in[0], out[1]);
/* resolve() does not return */
}
close(out[1]);
close(in[0]);
internal_query.type = T_SRV;
strncpy(internal_query.query, query, 255);
internal_query.query[255] = '\0';
if (write(in[1], &internal_query, sizeof(internal_query)) < 0)
purple_debug_error("dnssrv", "Could not write to SRV resolver\n");
query_data->pid = pid;
query_data->fd_out = out[0];
query_data->fd_in = in[1];
query_data->handle = purple_input_add(out[0], PURPLE_INPUT_READ, resolved, query_data);
return query_data;
#else
query_data->resolver = g_thread_create(res_thread, query_data, FALSE, &err);
if (query_data->resolver == NULL) {
query_data->error_message = g_strdup_printf("SRV thread create failure: %s\n", (err && err->message) ? err->message : "");
g_error_free(err);
}
/* The query isn't going to happen, so finish the SRV lookup now.
* Asynchronously call the callback since stuff may not expect
* the callback to be called before this returns */
if (query_data->error_message != NULL)
query_data->handle = purple_timeout_add(0, res_main_thread_cb, query_data);
return query_data;
#endif
}
PurpleSrvTxtQueryData *purple_txt_resolve(const char *owner,
const char *domain, PurpleTxtCallback cb, gpointer extradata)
{
return purple_txt_resolve_account(NULL, owner, domain, cb, extradata);
}
PurpleSrvTxtQueryData *purple_txt_resolve_account(PurpleAccount *account,
const char *owner, const char *domain, PurpleTxtCallback cb,
gpointer extradata)
{
char *query;
char *hostname;
PurpleSrvTxtQueryData *query_data;
PurpleProxyType proxy_type;
#ifndef _WIN32
PurpleSrvInternalQuery internal_query;
int in[2], out[2];
int pid;
#else
GError* err = NULL;
#endif
proxy_type = purple_proxy_info_get_type(
purple_proxy_get_setup(account));
if (proxy_type == PURPLE_PROXY_TOR) {
purple_debug_info("dnssrv", "Aborting TXT lookup in Tor Proxy mode.\n");
cb(NULL, extradata);
return NULL;
}
#ifdef USE_IDN
if (!dns_str_is_ascii(domain)) {
int ret = purple_network_convert_idn_to_ascii(domain, &hostname);
if (ret != 0) {
purple_debug_error("dnssrv", "IDNA ToASCII failed\n");
cb(NULL, extradata);
return NULL;
}
} else /* fallthru is intentional */
#endif
hostname = g_strdup(domain);
query = g_strdup_printf("%s.%s", owner, hostname);
purple_debug_info("dnssrv","querying TXT record for %s: %s\n", domain,
query);
g_free(hostname);
query_data = query_data_new(PurpleDnsTypeTxt, query, extradata);
query_data->cb.txt = cb;
if (purple_srv_txt_query_ui_resolve(query_data)) {
/* query intentionally not freed
*/
return query_data;
}
#ifndef _WIN32
if(pipe(in) || pipe(out)) {
purple_debug_error("dnssrv", "Could not create pipe\n");
g_free(query);
g_free(query_data);
cb(NULL, extradata);
return NULL;
}
pid = fork();
if (pid == -1) {
purple_debug_error("dnssrv", "Could not create process!\n");
g_free(query);
g_free(query_data);
cb(NULL, extradata);
return NULL;
}
/* Child */
if (pid == 0)
{
g_free(query);
g_free(query_data);
close(out[0]);
close(in[1]);
resolve(in[0], out[1]);
/* resolve() does not return */
}
close(out[1]);
close(in[0]);
internal_query.type = T_TXT;
strncpy(internal_query.query, query, 255);
internal_query.query[255] = '\0';
if (write(in[1], &internal_query, sizeof(internal_query)) < 0)
purple_debug_error("dnssrv", "Could not write to TXT resolver\n");
query_data->pid = pid;
query_data->fd_out = out[0];
query_data->fd_in = in[1];
query_data->handle = purple_input_add(out[0], PURPLE_INPUT_READ, resolved, query_data);
return query_data;
#else
query_data->resolver = g_thread_create(res_thread, query_data, FALSE, &err);
if (query_data->resolver == NULL) {
query_data->error_message = g_strdup_printf("TXT thread create failure: %s\n", (err && err->message) ? err->message : "");
g_error_free(err);
}
/* The query isn't going to happen, so finish the TXT lookup now.
* Asynchronously call the callback since stuff may not expect
* the callback to be called before this returns */
if (query_data->error_message != NULL)
query_data->handle = purple_timeout_add(0, res_main_thread_cb, query_data);
return query_data;
#endif
}
void
purple_txt_cancel(PurpleSrvTxtQueryData *query_data)
{
purple_srv_txt_query_destroy(query_data);
}
void
purple_srv_cancel(PurpleSrvTxtQueryData *query_data)
{
purple_srv_txt_query_destroy(query_data);
}
const gchar *
purple_txt_response_get_content(PurpleTxtResponse *resp)
{
g_return_val_if_fail(resp != NULL, NULL);
return resp->content;
}
void purple_txt_response_destroy(PurpleTxtResponse *resp)
{
g_return_if_fail(resp != NULL);
g_free(resp->content);
g_free(resp);
}
/*
* Only used as the callback for the ui ops.
*/
static void
purple_srv_query_resolved(PurpleSrvTxtQueryData *query_data, GList *records)
{
GList *l;
PurpleSrvResponse *records_array;
int i = 0, length;
g_return_if_fail(records != NULL);
if (query_data->cb.srv == NULL) {
purple_srv_txt_query_destroy(query_data);
while (records) {
g_free(records->data);
records = g_list_delete_link(records, records);
}
return;
}
records = purple_srv_sort(records);
length = g_list_length(records);
purple_debug_info("dnssrv", "SRV records resolved for %s, count: %d\n",
query_data->query, length);
records_array = g_new(PurpleSrvResponse, length);
for (l = records; l; l = l->next, i++) {
records_array[i] = *(PurpleSrvResponse *)l->data;
}
query_data->cb.srv(records_array, length, query_data->extradata);
purple_srv_txt_query_destroy(query_data);
while (records) {
g_free(records->data);
records = g_list_delete_link(records, records);
}
}
/*
* Only used as the callback for the ui ops.
*/
static void
purple_txt_query_resolved(PurpleSrvTxtQueryData *query_data, GList *entries)
{
g_return_if_fail(entries != NULL);
purple_debug_info("dnssrv", "TXT entries resolved for %s, count: %d\n", query_data->query, g_list_length(entries));
/* the callback should g_free the entries.
*/
if (query_data->cb.txt != NULL)
query_data->cb.txt(entries, query_data->extradata);
else {
while (entries) {
g_free(entries->data);
entries = g_list_delete_link(entries, entries);
}
}
purple_srv_txt_query_destroy(query_data);
}
static void
purple_srv_query_failed(PurpleSrvTxtQueryData *query_data, const gchar *error_message)
{
purple_debug_error("dnssrv", "%s\n", error_message);
if (query_data->cb.srv != NULL)
query_data->cb.srv(NULL, 0, query_data->extradata);
purple_srv_txt_query_destroy(query_data);
}
static gboolean
purple_srv_txt_query_ui_resolve(PurpleSrvTxtQueryData *query_data)
{
PurpleSrvTxtQueryUiOps *ops = purple_srv_txt_query_get_ui_ops();
if (ops && ops->resolve)
return ops->resolve(query_data, (query_data->type == T_SRV ? purple_srv_query_resolved : purple_txt_query_resolved), purple_srv_query_failed);
return FALSE;
}
void
purple_srv_txt_query_set_ui_ops(PurpleSrvTxtQueryUiOps *ops)
{
srv_txt_query_ui_ops = ops;
}
PurpleSrvTxtQueryUiOps *
purple_srv_txt_query_get_ui_ops(void)
{
/* It is perfectly acceptable for srv_txt_query_ui_ops to be NULL; this just
* means that the default platform-specific implementation will be used.
*/
return srv_txt_query_ui_ops;
}
char *
purple_srv_txt_query_get_query(PurpleSrvTxtQueryData *query_data)
{
g_return_val_if_fail(query_data != NULL, NULL);
return query_data->query;
}
int
purple_srv_txt_query_get_type(PurpleSrvTxtQueryData *query_data)
{
g_return_val_if_fail(query_data != NULL, 0);
return query_data->type;
}