CURLOPT_RESOLVE: Add support for multiple IP addresses per entry
This enables users to preresolve but still take advantage of happy eyeballs and trying multiple addresses if some are not connecting. Ref: https://github.com/curl/curl/pull/2260
This commit is contained in:
Anders Bakken
Jay Satiro
Родитель
e77f0e5a5a
Коммит
50d1b3379a
|
|
@ -1,5 +1,5 @@
|
|||
Long: resolve
|
||||
Arg: <host:port:address>
|
||||
Arg: <host:port:address[,address]...>
|
||||
Help: Resolve the host+port to this address
|
||||
Added: 7.21.3
|
||||
---
|
||||
|
|
@ -16,4 +16,6 @@ is set to make curl use another IP version.
|
|||
|
||||
Support for providing the IP address within [brackets] was added in 7.57.0.
|
||||
|
||||
Support for providing multiple IP addresses per entry was added in 7.59.0.
|
||||
|
||||
This option can be used many times to add many host names to resolve.
|
||||
|
|
|
|||
|
|
@ -37,10 +37,12 @@ list of \fBstruct curl_slist\fP structs properly filled in. Use
|
|||
to clean up an entire list.
|
||||
|
||||
Each single name resolve string should be written using the format
|
||||
HOST:PORT:ADDRESS where HOST is the name libcurl will try to resolve, PORT is
|
||||
the port number of the service where libcurl wants to connect to the HOST and
|
||||
ADDRESS is the numerical IP address. If libcurl is built to support IPv6,
|
||||
ADDRESS can of course be either IPv4 or IPv6 style addressing.
|
||||
HOST:PORT:ADDRESS[,ADDRESS]... where HOST is the name libcurl will try
|
||||
to resolve, PORT is the port number of the service where libcurl wants
|
||||
to connect to the HOST and ADDRESS is one or more numerical IP
|
||||
addresses. If you specify multiple ip addresses they need to be
|
||||
separated by comma. If libcurl is built to support IPv6, each of the
|
||||
ADDRESS entries can of course be either IPv4 or IPv6 style addressing.
|
||||
|
||||
This option effectively pre-populates the DNS cache with entries for the
|
||||
host+port pair so redirects and everything that operations against the
|
||||
|
|
@ -57,6 +59,8 @@ by including a string in the linked list that uses the format
|
|||
and port number must exactly match what was already added previously.
|
||||
|
||||
Support for providing the ADDRESS within [brackets] was added in 7.57.0.
|
||||
|
||||
Support for providing multiple IP addresses per entry was added in 7.59.0.
|
||||
.SH DEFAULT
|
||||
NULL
|
||||
.SH PROTOCOLS
|
||||
|
|
|
|||
|
|
@ -619,8 +619,8 @@ void Curl_persistconninfo(struct connectdata *conn)
|
|||
|
||||
/* retrieves ip address and port from a sockaddr structure.
|
||||
note it calls Curl_inet_ntop which sets errno on fail, not SOCKERRNO. */
|
||||
static bool getaddressinfo(struct sockaddr *sa, char *addr,
|
||||
long *port)
|
||||
bool Curl_getaddressinfo(struct sockaddr *sa, char *addr,
|
||||
long *port)
|
||||
{
|
||||
unsigned short us_port;
|
||||
struct sockaddr_in *si = NULL;
|
||||
|
|
@ -700,16 +700,16 @@ void Curl_updateconninfo(struct connectdata *conn, curl_socket_t sockfd)
|
|||
return;
|
||||
}
|
||||
|
||||
if(!getaddressinfo((struct sockaddr*)&ssrem,
|
||||
conn->primary_ip, &conn->primary_port)) {
|
||||
if(!Curl_getaddressinfo((struct sockaddr*)&ssrem,
|
||||
conn->primary_ip, &conn->primary_port)) {
|
||||
failf(data, "ssrem inet_ntop() failed with errno %d: %s",
|
||||
errno, Curl_strerror(conn, errno));
|
||||
return;
|
||||
}
|
||||
memcpy(conn->ip_addr_str, conn->primary_ip, MAX_IPADR_LEN);
|
||||
|
||||
if(!getaddressinfo((struct sockaddr*)&ssloc,
|
||||
conn->local_ip, &conn->local_port)) {
|
||||
if(!Curl_getaddressinfo((struct sockaddr*)&ssloc,
|
||||
conn->local_ip, &conn->local_port)) {
|
||||
failf(data, "ssloc inet_ntop() failed with errno %d: %s",
|
||||
errno, Curl_strerror(conn, errno));
|
||||
return;
|
||||
|
|
@ -1005,8 +1005,8 @@ static CURLcode singleipconnect(struct connectdata *conn,
|
|||
return CURLE_OK;
|
||||
|
||||
/* store remote address and port used in this connection attempt */
|
||||
if(!getaddressinfo((struct sockaddr*)&addr.sa_addr,
|
||||
ipaddress, &port)) {
|
||||
if(!Curl_getaddressinfo((struct sockaddr*)&addr.sa_addr,
|
||||
ipaddress, &port)) {
|
||||
/* malformed address or bug in inet_ntop, try next address */
|
||||
failf(data, "sa_addr inet_ntop() failed with errno %d: %s",
|
||||
errno, Curl_strerror(conn, errno));
|
||||
|
|
|
|||
|
|
@ -77,6 +77,11 @@ void Curl_updateconninfo(struct connectdata *conn, curl_socket_t sockfd);
|
|||
void Curl_persistconninfo(struct connectdata *conn);
|
||||
int Curl_closesocket(struct connectdata *conn, curl_socket_t sock);
|
||||
|
||||
/*
|
||||
* Get presentation format IP address and port from a sockaddr.
|
||||
*/
|
||||
bool Curl_getaddressinfo(struct sockaddr *sa, char *addr, long *port);
|
||||
|
||||
/*
|
||||
* The Curl_sockaddr_ex structure is basically libcurl's external API
|
||||
* curl_sockaddr structure with enough space available to directly hold any
|
||||
|
|
|
|||
120
lib/hostip.c
120
lib/hostip.c
|
|
@ -781,7 +781,7 @@ CURLcode Curl_loadhostpairs(struct Curl_easy *data)
|
|||
{
|
||||
struct curl_slist *hostp;
|
||||
char hostname[256];
|
||||
int port;
|
||||
int port = 0;
|
||||
|
||||
for(hostp = data->change.resolve; hostp; hostp = hostp->next) {
|
||||
if(!hostp->data)
|
||||
|
|
@ -819,32 +819,95 @@ CURLcode Curl_loadhostpairs(struct Curl_easy *data)
|
|||
}
|
||||
else {
|
||||
struct Curl_dns_entry *dns;
|
||||
Curl_addrinfo *addr;
|
||||
Curl_addrinfo *head = NULL, *tail = NULL;
|
||||
char *entry_id;
|
||||
size_t entry_len;
|
||||
char buffer[256];
|
||||
char *address = &buffer[0];
|
||||
char address[64];
|
||||
char *addresses;
|
||||
char *addr_begin;
|
||||
char *addr_end;
|
||||
char *port_ptr;
|
||||
char *end_ptr;
|
||||
char *host_end;
|
||||
unsigned long tmp_port;
|
||||
bool error = true;
|
||||
|
||||
if(3 != sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port,
|
||||
address)) {
|
||||
host_end = strchr(hostp->data, ':');
|
||||
if(!host_end ||
|
||||
((host_end - hostp->data) >= (ptrdiff_t)sizeof(hostname)))
|
||||
goto err;
|
||||
|
||||
memcpy(hostname, hostp->data, host_end - hostp->data);
|
||||
hostname[host_end - hostp->data] = '\0';
|
||||
|
||||
port_ptr = host_end + 1;
|
||||
tmp_port = strtoul(port_ptr, &end_ptr, 10);
|
||||
if(end_ptr == port_ptr || tmp_port > USHRT_MAX || *end_ptr != ':')
|
||||
goto err;
|
||||
|
||||
port = (int)tmp_port;
|
||||
addresses = end_ptr + 1;
|
||||
|
||||
while(*end_ptr) {
|
||||
size_t alen;
|
||||
Curl_addrinfo *ai;
|
||||
|
||||
addr_begin = end_ptr + 1;
|
||||
addr_end = strchr(addr_begin, ',');
|
||||
if(!addr_end)
|
||||
addr_end = addr_begin + strlen(addr_begin);
|
||||
end_ptr = addr_end;
|
||||
|
||||
/* allow IP(v6) address within [brackets] */
|
||||
if(*addr_begin == '[') {
|
||||
if(addr_end == addr_begin || *(addr_end - 1) != ']')
|
||||
goto err;
|
||||
++addr_begin;
|
||||
--addr_end;
|
||||
}
|
||||
|
||||
alen = addr_end - addr_begin;
|
||||
if(!alen)
|
||||
continue;
|
||||
|
||||
if(alen >= sizeof(address))
|
||||
goto err;
|
||||
|
||||
memcpy(address, addr_begin, alen);
|
||||
address[alen] = '\0';
|
||||
|
||||
#ifndef ENABLE_IPV6
|
||||
if(strchr(address, ':')) {
|
||||
infof(data, "Ignoring resolve address '%s', missing IPv6 support.\n",
|
||||
address);
|
||||
continue;
|
||||
}
|
||||
#endif
|
||||
|
||||
ai = Curl_str2addr(address, port);
|
||||
if(!ai) {
|
||||
infof(data, "Resolve address '%s' found illegal!\n", address);
|
||||
goto err;
|
||||
}
|
||||
|
||||
if(tail) {
|
||||
tail->ai_next = ai;
|
||||
tail = tail->ai_next;
|
||||
}
|
||||
else {
|
||||
head = tail = ai;
|
||||
}
|
||||
}
|
||||
|
||||
if(!head)
|
||||
goto err;
|
||||
|
||||
error = false;
|
||||
err:
|
||||
if(error) {
|
||||
infof(data, "Couldn't parse CURLOPT_RESOLVE entry '%s'!\n",
|
||||
hostp->data);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* allow IP(v6) address within [brackets] */
|
||||
if(address[0] == '[') {
|
||||
size_t alen = strlen(address);
|
||||
if(address[alen-1] != ']')
|
||||
/* it needs to also end with ] to be valid */
|
||||
continue;
|
||||
address[alen-1] = 0; /* zero terminate there */
|
||||
address++; /* pass the open bracket */
|
||||
}
|
||||
|
||||
addr = Curl_str2addr(address, port);
|
||||
if(!addr) {
|
||||
infof(data, "Address in '%s' found illegal!\n", hostp->data);
|
||||
Curl_freeaddrinfo(head);
|
||||
continue;
|
||||
}
|
||||
|
||||
|
|
@ -852,10 +915,9 @@ CURLcode Curl_loadhostpairs(struct Curl_easy *data)
|
|||
entry_id = create_hostcache_id(hostname, port);
|
||||
/* If we can't create the entry id, fail */
|
||||
if(!entry_id) {
|
||||
Curl_freeaddrinfo(addr);
|
||||
Curl_freeaddrinfo(head);
|
||||
return CURLE_OUT_OF_MEMORY;
|
||||
}
|
||||
|
||||
entry_len = strlen(entry_id);
|
||||
|
||||
if(data->share)
|
||||
|
|
@ -869,7 +931,7 @@ CURLcode Curl_loadhostpairs(struct Curl_easy *data)
|
|||
|
||||
if(!dns) {
|
||||
/* if not in the cache already, put this host in the cache */
|
||||
dns = Curl_cache_addr(data, addr, hostname, port);
|
||||
dns = Curl_cache_addr(data, head, hostname, port);
|
||||
if(dns) {
|
||||
dns->timestamp = 0; /* mark as added by CURLOPT_RESOLVE */
|
||||
/* release the returned reference; the cache itself will keep the
|
||||
|
|
@ -880,19 +942,19 @@ CURLcode Curl_loadhostpairs(struct Curl_easy *data)
|
|||
else {
|
||||
/* this is a duplicate, free it again */
|
||||
infof(data, "RESOLVE %s:%d is already cached, %s not stored!\n",
|
||||
hostname, port, address);
|
||||
Curl_freeaddrinfo(addr);
|
||||
hostname, port, addresses);
|
||||
Curl_freeaddrinfo(head);
|
||||
}
|
||||
|
||||
if(data->share)
|
||||
Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
|
||||
|
||||
if(!dns) {
|
||||
Curl_freeaddrinfo(addr);
|
||||
Curl_freeaddrinfo(head);
|
||||
return CURLE_OUT_OF_MEMORY;
|
||||
}
|
||||
infof(data, "Added %s:%d:%s to DNS cache\n",
|
||||
hostname, port, address);
|
||||
hostname, port, addresses);
|
||||
}
|
||||
}
|
||||
data->change.resolve = NULL; /* dealt with now */
|
||||
|
|
|
|||
|
|
@ -172,7 +172,7 @@ test1525 test1526 test1527 test1528 test1529 test1530 test1531 test1532 \
|
|||
test1533 test1534 test1535 test1536 test1537 test1538 \
|
||||
test1540 \
|
||||
test1550 test1551 test1552 test1553 test1554 test1555 test1556 \
|
||||
test1600 test1601 test1602 test1603 test1604 test1605 test1606 \
|
||||
test1600 test1601 test1602 test1603 test1604 test1605 test1606 test1607 \
|
||||
\
|
||||
test1700 test1701 test1702 \
|
||||
\
|
||||
|
|
|
|||
|
|
@ -0,0 +1,26 @@
|
|||
<testcase>
|
||||
<info>
|
||||
<keywords>
|
||||
unittest
|
||||
CURLOPT_RESOLVE
|
||||
</keywords>
|
||||
</info>
|
||||
|
||||
#
|
||||
# Client-side
|
||||
<client>
|
||||
<server>
|
||||
none
|
||||
</server>
|
||||
<features>
|
||||
unittest
|
||||
</features>
|
||||
<name>
|
||||
CURLOPT_RESOLVE parsing
|
||||
</name>
|
||||
<tool>
|
||||
unit1607
|
||||
</tool>
|
||||
</client>
|
||||
|
||||
</testcase>
|
||||
|
|
@ -9,7 +9,7 @@ UNITPROGS = unit1300 unit1301 unit1302 unit1303 unit1304 unit1305 unit1307 \
|
|||
unit1308 unit1309 unit1323 \
|
||||
unit1330 unit1394 unit1395 unit1396 unit1397 unit1398 \
|
||||
unit1399 \
|
||||
unit1600 unit1601 unit1602 unit1603 unit1604 unit1605 unit1606
|
||||
unit1600 unit1601 unit1602 unit1603 unit1604 unit1605 unit1606 unit1607
|
||||
|
||||
unit1300_SOURCES = unit1300.c $(UNITFILES)
|
||||
unit1300_CPPFLAGS = $(AM_CPPFLAGS)
|
||||
|
|
@ -85,3 +85,6 @@ unit1605_CPPFLAGS = $(AM_CPPFLAGS)
|
|||
|
||||
unit1606_SOURCES = unit1606.c $(UNITFILES)
|
||||
unit1606_CPPFLAGS = $(AM_CPPFLAGS)
|
||||
|
||||
unit1607_SOURCES = unit1607.c $(UNITFILES)
|
||||
unit1607_CPPFLAGS = $(AM_CPPFLAGS)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,203 @@
|
|||
/***************************************************************************
|
||||
* _ _ ____ _
|
||||
* Project ___| | | | _ \| |
|
||||
* / __| | | | |_) | |
|
||||
* | (__| |_| | _ <| |___
|
||||
* \___|\___/|_| \_\_____|
|
||||
*
|
||||
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
|
||||
*
|
||||
* This software is licensed as described in the file COPYING, which
|
||||
* you should have received as part of this distribution. The terms
|
||||
* are also available at https://curl.haxx.se/docs/copyright.html.
|
||||
*
|
||||
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
||||
* copies of the Software, and permit persons to whom the Software is
|
||||
* furnished to do so, under the terms of the COPYING file.
|
||||
*
|
||||
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
||||
* KIND, either express or implied.
|
||||
*
|
||||
***************************************************************************/
|
||||
#include "curlcheck.h"
|
||||
|
||||
#include "urldata.h"
|
||||
#include "connect.h"
|
||||
#include "share.h"
|
||||
|
||||
#include "memdebug.h" /* LAST include file */
|
||||
|
||||
static struct Curl_easy *easy;
|
||||
struct curl_hash *hostcache;
|
||||
|
||||
static CURLcode unit_setup(void)
|
||||
{
|
||||
int res = CURLE_OK;
|
||||
|
||||
global_init(CURL_GLOBAL_ALL);
|
||||
|
||||
easy = curl_easy_init();
|
||||
if(!easy)
|
||||
return CURLE_OUT_OF_MEMORY;
|
||||
|
||||
hostcache = Curl_global_host_cache_init();
|
||||
if(!hostcache)
|
||||
return CURLE_OUT_OF_MEMORY;
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static void unit_stop(void)
|
||||
{
|
||||
curl_easy_cleanup(easy);
|
||||
curl_global_cleanup();
|
||||
}
|
||||
|
||||
struct testcase {
|
||||
/* host:port:address[,address]... */
|
||||
const char *optval;
|
||||
|
||||
/* lowercase host and port to retrieve the addresses from hostcache */
|
||||
const char *host;
|
||||
int port;
|
||||
|
||||
/* 0 to 9 addresses expected from hostcache */
|
||||
const char *address[10];
|
||||
};
|
||||
|
||||
|
||||
/* In builds without IPv6 support CURLOPT_RESOLVE should skip over those
|
||||
addresses, so we have to do that as well. */
|
||||
static const char skip = 0;
|
||||
#ifdef ENABLE_IPV6
|
||||
#define IPV6ONLY(x) x
|
||||
#else
|
||||
#define IPV6ONLY(x) &skip
|
||||
#endif
|
||||
|
||||
/* CURLOPT_RESOLVE address parsing tests */
|
||||
static const struct testcase tests[] = {
|
||||
/* spaces aren't allowed, for now */
|
||||
{ "test.com:80:127.0.0.1, 127.0.0.2",
|
||||
"test.com", 80, { NULL, }
|
||||
},
|
||||
{ "TEST.com:80:,,127.0.0.1,,,127.0.0.2,,,,::1,,,",
|
||||
"test.com", 80, { "127.0.0.1", "127.0.0.2", IPV6ONLY("::1"), }
|
||||
},
|
||||
{ "test.com:80:::1,127.0.0.1",
|
||||
"test.com", 80, { IPV6ONLY("::1"), "127.0.0.1", }
|
||||
},
|
||||
{ "test.com:80:[::1],127.0.0.1",
|
||||
"test.com", 80, { IPV6ONLY("::1"), "127.0.0.1", }
|
||||
},
|
||||
{ "test.com:80:::1",
|
||||
"test.com", 80, { IPV6ONLY("::1"), }
|
||||
},
|
||||
{ "test.com:80:[::1]",
|
||||
"test.com", 80, { IPV6ONLY("::1"), }
|
||||
},
|
||||
{ "test.com:80:127.0.0.1",
|
||||
"test.com", 80, { "127.0.0.1", }
|
||||
},
|
||||
{ "test.com:80:,127.0.0.1",
|
||||
"test.com", 80, { "127.0.0.1", }
|
||||
},
|
||||
{ "test.com:80:127.0.0.1,",
|
||||
"test.com", 80, { "127.0.0.1", }
|
||||
},
|
||||
{ "test.com:0:127.0.0.1",
|
||||
"test.com", 0, { "127.0.0.1", }
|
||||
},
|
||||
};
|
||||
|
||||
UNITTEST_START
|
||||
int i;
|
||||
int testnum = sizeof(tests) / sizeof(struct testcase);
|
||||
|
||||
for(i = 0; i < testnum; ++i, curl_easy_reset(easy)) {
|
||||
int j;
|
||||
int addressnum = sizeof tests[i].address / sizeof *tests[i].address;
|
||||
struct Curl_addrinfo *addr;
|
||||
struct Curl_dns_entry *dns;
|
||||
struct curl_slist *list;
|
||||
void *entry_id;
|
||||
bool problem = false;
|
||||
|
||||
Curl_hostcache_clean(easy, hostcache);
|
||||
easy->dns.hostcache = hostcache;
|
||||
easy->dns.hostcachetype = HCACHE_GLOBAL;
|
||||
|
||||
list = curl_slist_append(NULL, tests[i].optval);
|
||||
curl_easy_setopt(easy, CURLOPT_RESOLVE, list);
|
||||
|
||||
Curl_loadhostpairs(easy);
|
||||
|
||||
entry_id = (void *)aprintf("%s:%d", tests[i].host, tests[i].port);
|
||||
dns = Curl_hash_pick(easy->dns.hostcache, entry_id, strlen(entry_id) + 1);
|
||||
free(entry_id);
|
||||
entry_id = NULL;
|
||||
|
||||
addr = dns ? dns->addr : NULL;
|
||||
|
||||
for(j = 0; j < addressnum; ++j) {
|
||||
long port = 0;
|
||||
char ipaddress[MAX_IPADR_LEN] = {0};
|
||||
|
||||
if(!addr && !tests[i].address[j])
|
||||
break;
|
||||
|
||||
if(tests[i].address[j] == &skip)
|
||||
continue;
|
||||
|
||||
if(addr && !Curl_getaddressinfo(addr->ai_addr,
|
||||
ipaddress, &port)) {
|
||||
fprintf(stderr, "%s:%d tests[%d] failed. getaddressinfo failed.\n",
|
||||
__FILE__, __LINE__, i);
|
||||
problem = true;
|
||||
break;
|
||||
}
|
||||
|
||||
if(addr && !tests[i].address[j]) {
|
||||
fprintf(stderr, "%s:%d tests[%d] failed. the retrieved addr "
|
||||
"is %s but tests[%d].address[%d] is NULL.\n",
|
||||
__FILE__, __LINE__, i, ipaddress, i, j);
|
||||
problem = true;
|
||||
break;
|
||||
}
|
||||
|
||||
if(!addr && tests[i].address[j]) {
|
||||
fprintf(stderr, "%s:%d tests[%d] failed. the retrieved addr "
|
||||
"is NULL but tests[%d].address[%d] is %s.\n",
|
||||
__FILE__, __LINE__, i, i, j, tests[i].address[j]);
|
||||
problem = true;
|
||||
break;
|
||||
}
|
||||
|
||||
if(!curl_strequal(ipaddress, tests[i].address[j])) {
|
||||
fprintf(stderr, "%s:%d tests[%d] failed. the retrieved addr "
|
||||
"%s is not equal to tests[%d].address[%d] %s.\n",
|
||||
__FILE__, __LINE__, i, ipaddress, i, j, tests[i].address[j]);
|
||||
problem = true;
|
||||
break;
|
||||
}
|
||||
|
||||
if(port != tests[i].port) {
|
||||
fprintf(stderr, "%s:%d tests[%d] failed. the retrieved port "
|
||||
"for tests[%d].address[%d] is %ld but tests[%d].port is %d.\n",
|
||||
__FILE__, __LINE__, i, i, j, port, i, tests[i].port);
|
||||
problem = true;
|
||||
break;
|
||||
}
|
||||
|
||||
addr = addr->ai_next;
|
||||
}
|
||||
|
||||
Curl_hostcache_clean(easy, easy->dns.hostcache);
|
||||
curl_slist_free_all(list);
|
||||
|
||||
if(problem) {
|
||||
unitfail++;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
UNITTEST_STOP
|
||||
Загрузка…
Ссылка в новой задаче