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-rw-r--r--src/c-ares/ares_options.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/src/c-ares/ares_options.c b/src/c-ares/ares_options.c
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+++ b/src/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);
+}
+
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