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A C library for asynchronous DNS requests (grpc依赖)
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c-ares/ares_options.c

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/* Copyright 1998 by the Massachusetts Institute of Technology.
* Copyright (C) 2008-2013 by Daniel Stenberg
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
*/
#include "ares_setup.h"
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#include "ares.h"
#include "ares_data.h"
#include "ares_inet_net_pton.h"
#include "ares_private.h"
int ares_get_servers(ares_channel channel,
struct ares_addr_node **servers)
{
struct ares_addr_node *srvr_head = NULL;
struct ares_addr_node *srvr_last = NULL;
struct ares_addr_node *srvr_curr;
int status = ARES_SUCCESS;
int i;
if (!channel)
return ARES_ENODATA;
for (i = 0; i < channel->nservers; i++)
{
/* Allocate storage for this server node appending it to the list */
srvr_curr = ares_malloc_data(ARES_DATATYPE_ADDR_NODE);
if (!srvr_curr)
{
status = ARES_ENOMEM;
break;
}
if (srvr_last)
{
srvr_last->next = srvr_curr;
}
else
{
srvr_head = srvr_curr;
}
srvr_last = srvr_curr;
/* Fill this server node data */
srvr_curr->family = channel->servers[i].addr.family;
if (srvr_curr->family == AF_INET)
memcpy(&srvr_curr->addrV4, &channel->servers[i].addr.addrV4,
sizeof(srvr_curr->addrV4));
else
memcpy(&srvr_curr->addrV6, &channel->servers[i].addr.addrV6,
sizeof(srvr_curr->addrV6));
}
if (status != ARES_SUCCESS)
{
if (srvr_head)
{
ares_free_data(srvr_head);
srvr_head = NULL;
}
}
*servers = srvr_head;
return status;
}
int ares_get_servers_ports(ares_channel channel,
struct ares_addr_port_node **servers)
{
struct ares_addr_port_node *srvr_head = NULL;
struct ares_addr_port_node *srvr_last = NULL;
struct ares_addr_port_node *srvr_curr;
int status = ARES_SUCCESS;
int i;
if (!channel)
return ARES_ENODATA;
for (i = 0; i < channel->nservers; i++)
{
/* Allocate storage for this server node appending it to the list */
srvr_curr = ares_malloc_data(ARES_DATATYPE_ADDR_PORT_NODE);
if (!srvr_curr)
{
status = ARES_ENOMEM;
break;
}
if (srvr_last)
{
srvr_last->next = srvr_curr;
}
else
{
srvr_head = srvr_curr;
}
srvr_last = srvr_curr;
/* Fill this server node data */
srvr_curr->family = channel->servers[i].addr.family;
srvr_curr->udp_port = ntohs((unsigned short)channel->servers[i].addr.udp_port);
srvr_curr->tcp_port = ntohs((unsigned short)channel->servers[i].addr.tcp_port);
if (srvr_curr->family == AF_INET)
memcpy(&srvr_curr->addrV4, &channel->servers[i].addr.addrV4,
sizeof(srvr_curr->addrV4));
else
memcpy(&srvr_curr->addrV6, &channel->servers[i].addr.addrV6,
sizeof(srvr_curr->addrV6));
}
if (status != ARES_SUCCESS)
{
if (srvr_head)
{
ares_free_data(srvr_head);
srvr_head = NULL;
}
}
*servers = srvr_head;
return status;
}
int ares_set_servers(ares_channel channel,
struct ares_addr_node *servers)
{
struct ares_addr_node *srvr;
int num_srvrs = 0;
int i;
if (ares_library_initialized() != ARES_SUCCESS)
return ARES_ENOTINITIALIZED; /* LCOV_EXCL_LINE: n/a on non-WinSock */
if (!channel)
return ARES_ENODATA;
ares__destroy_servers_state(channel);
for (srvr = servers; srvr; srvr = srvr->next)
{
num_srvrs++;
}
if (num_srvrs > 0)
{
/* Allocate storage for servers state */
channel->servers = ares_malloc(num_srvrs * sizeof(struct server_state));
if (!channel->servers)
{
return ARES_ENOMEM;
}
channel->nservers = num_srvrs;
/* Fill servers state address data */
for (i = 0, srvr = servers; srvr; i++, srvr = srvr->next)
{
channel->servers[i].addr.family = srvr->family;
channel->servers[i].addr.udp_port = 0;
channel->servers[i].addr.tcp_port = 0;
if (srvr->family == AF_INET)
memcpy(&channel->servers[i].addr.addrV4, &srvr->addrV4,
sizeof(srvr->addrV4));
else
memcpy(&channel->servers[i].addr.addrV6, &srvr->addrV6,
sizeof(srvr->addrV6));
}
/* Initialize servers state remaining data */
ares__init_servers_state(channel);
}
return ARES_SUCCESS;
}
int ares_set_servers_ports(ares_channel channel,
struct ares_addr_port_node *servers)
{
struct ares_addr_port_node *srvr;
int num_srvrs = 0;
int i;
if (ares_library_initialized() != ARES_SUCCESS)
return ARES_ENOTINITIALIZED; /* LCOV_EXCL_LINE: n/a on non-WinSock */
if (!channel)
return ARES_ENODATA;
ares__destroy_servers_state(channel);
for (srvr = servers; srvr; srvr = srvr->next)
{
num_srvrs++;
}
if (num_srvrs > 0)
{
/* Allocate storage for servers state */
channel->servers = ares_malloc(num_srvrs * sizeof(struct server_state));
if (!channel->servers)
{
return ARES_ENOMEM;
}
channel->nservers = num_srvrs;
/* Fill servers state address data */
for (i = 0, srvr = servers; srvr; i++, srvr = srvr->next)
{
channel->servers[i].addr.family = srvr->family;
channel->servers[i].addr.udp_port = htons((unsigned short)srvr->udp_port);
channel->servers[i].addr.tcp_port = htons((unsigned short)srvr->tcp_port);
if (srvr->family == AF_INET)
memcpy(&channel->servers[i].addr.addrV4, &srvr->addrV4,
sizeof(srvr->addrV4));
else
memcpy(&channel->servers[i].addr.addrV6, &srvr->addrV6,
sizeof(srvr->addrV6));
}
/* Initialize servers state remaining data */
ares__init_servers_state(channel);
}
return ARES_SUCCESS;
}
/* Incomming string format: host[:port][,host[:port]]... */
/* IPv6 addresses with ports require square brackets [fe80::1%lo0]:53 */
static int set_servers_csv(ares_channel channel,
const char* _csv, int use_port)
{
size_t i;
char* csv = NULL;
char* ptr;
char* start_host;
int cc = 0;
int rv = ARES_SUCCESS;
struct ares_addr_port_node *servers = NULL;
struct ares_addr_port_node *last = NULL;
if (ares_library_initialized() != ARES_SUCCESS)
return ARES_ENOTINITIALIZED; /* LCOV_EXCL_LINE: n/a on non-WinSock */
if (!channel)
return ARES_ENODATA;
ares__destroy_servers_state(channel);
i = strlen(_csv);
if (i == 0)
return ARES_SUCCESS; /* blank all servers */
csv = ares_malloc(i + 2);
if (!csv)
return ARES_ENOMEM;
strcpy(csv, _csv);
if (csv[i-1] != ',') { /* make parsing easier by ensuring ending ',' */
csv[i] = ',';
csv[i+1] = 0;
}
start_host = csv;
for (ptr = csv; *ptr; ptr++) {
if (*ptr == ':') {
/* count colons to determine if we have an IPv6 number or IPv4 with
port */
cc++;
}
else if (*ptr == '[') {
/* move start_host if an open square bracket is found wrapping an IPv6
address */
start_host = ptr + 1;
}
else if (*ptr == ',') {
char* pp = ptr - 1;
char* p = ptr;
int port = 0;
struct in_addr in4;
struct ares_in6_addr in6;
struct ares_addr_port_node *s = NULL;
*ptr = 0; /* null terminate host:port string */
/* Got an entry..see if the port was specified. */
if (cc > 0) {
while (pp > start_host) {
/* a single close square bracket followed by a colon, ']:' indicates
an IPv6 address with port */
if ((*pp == ']') && (*p == ':'))
break; /* found port */
/* a single colon, ':' indicates an IPv4 address with port */
if ((*pp == ':') && (cc == 1))
break; /* found port */
if (!(ISDIGIT(*pp) || (*pp == ':'))) {
/* Found end of digits before we found :, so wasn't a port */
/* must allow ':' for IPv6 case of ']:' indicates we found a port */
pp = p = ptr;
break;
}
pp--;
p--;
}
if ((pp != start_host) && ((pp + 1) < ptr)) {
/* Found it. Parse over the port number */
/* when an IPv6 address is wrapped with square brackets the port
starts at pp + 2 */
if (*pp == ']')
p++; /* move p before ':' */
/* p will point to the start of the port */
port = (int)strtol(p, NULL, 10);
*pp = 0; /* null terminate host */
}
}
/* resolve host, try ipv4 first, rslt is in network byte order */
rv = ares_inet_pton(AF_INET, start_host, &in4);
if (!rv) {
/* Ok, try IPv6 then */
rv = ares_inet_pton(AF_INET6, start_host, &in6);
if (!rv) {
rv = ARES_EBADSTR;
goto out;
}
/* was ipv6, add new server */
s = ares_malloc(sizeof(*s));
if (!s) {
rv = ARES_ENOMEM;
goto out;
}
s->family = AF_INET6;
memcpy(&s->addr, &in6, sizeof(struct ares_in6_addr));
}
else {
/* was ipv4, add new server */
s = ares_malloc(sizeof(*s));
if (!s) {
rv = ARES_ENOMEM;
goto out;
}
s->family = AF_INET;
memcpy(&s->addr, &in4, sizeof(struct in_addr));
}
if (s) {
s->udp_port = use_port ? port: 0;
s->tcp_port = s->udp_port;
s->next = NULL;
if (last) {
last->next = s;
/* need to move last to maintain the linked list */
last = last->next;
}
else {
servers = s;
last = s;
}
}
/* Set up for next one */
start_host = ptr + 1;
cc = 0;
}
}
rv = ares_set_servers_ports(channel, servers);
out:
if (csv)
ares_free(csv);
while (servers) {
struct ares_addr_port_node *s = servers;
servers = servers->next;
ares_free(s);
}
return rv;
}
int ares_set_servers_csv(ares_channel channel,
const char* _csv)
{
return set_servers_csv(channel, _csv, FALSE);
}
int ares_set_servers_ports_csv(ares_channel channel,
const char* _csv)
{
return set_servers_csv(channel, _csv, TRUE);
}