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efe3cb6e1a
curl/ares/ares_init.c
Daniel Stenberg 00ae13f966 - Guilherme Balena Versiani: I noted a strange BUG in Win32 port 
(ares_init.c/get_iphlpapi_dns_info() function): when I disable the network
  by hand or disconnect the network cable in Windows 2000 or Windows XP, my
  application gets 127.0.0.1 as the only name server. The problem comes from
  'GetNetworkParams' function, that returns the empty string "" as the only
  name server in that case. Moreover, the Windows implementation of
  inet_addr() returns INADDR_LOOPBACK instead of INADDR_NONE.
2006-09-11 20:25:13 +00:00

1082 lines
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/* $Id$ */
/* Copyright 1998 by the Massachusetts Institute of Technology.
*
* 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 "setup.h"
#include <sys/types.h>
#if defined(WIN32) && !defined(WATT32)
#include "nameser.h"
#include <iphlpapi.h>
#include <malloc.h>
#else
#include <sys/param.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <arpa/nameser.h>
#ifdef HAVE_ARPA_NAMESER_COMPAT_H
#include <arpa/nameser_compat.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <errno.h>
#include "ares.h"
#include "ares_private.h"
#include "inet_net_pton.h"
#ifdef WATT32
#undef WIN32 /* Redefined in MingW/MSVC headers */
#endif
static int init_by_options(ares_channel channel, struct ares_options *options,
int optmask);
static int init_by_environment(ares_channel channel);
static int init_by_resolv_conf(ares_channel channel);
static int init_by_defaults(ares_channel channel);
static int config_nameserver(struct server_state **servers, int *nservers,
char *str);
static int set_search(ares_channel channel, const char *str);
static int set_options(ares_channel channel, const char *str);
static const char *try_option(const char *p, const char *q, const char *opt);
#ifndef WIN32
static int sortlist_alloc(struct apattern **sortlist, int *nsort, struct apattern *pat);
static int ip_addr(const char *s, int len, struct in_addr *addr);
static void natural_mask(struct apattern *pat);
static int config_domain(ares_channel channel, char *str);
static int config_lookup(ares_channel channel, const char *str,
const char *bindch, const char *filech);
static int config_sortlist(struct apattern **sortlist, int *nsort,
const char *str);
static char *try_config(char *s, const char *opt);
#endif
int ares_init(ares_channel *channelptr)
{
return ares_init_options(channelptr, NULL, 0);
}
int ares_init_options(ares_channel *channelptr, struct ares_options *options,
int optmask)
{
ares_channel channel;
int i, status;
struct server_state *server;
struct timeval tv;
#ifdef CURLDEBUG
const char *env = getenv("CARES_MEMDEBUG");
if (env)
curl_memdebug(env);
env = getenv("CARES_MEMLIMIT");
if (env)
curl_memlimit(atoi(env));
#endif
channel = malloc(sizeof(struct ares_channeldata));
if (!channel)
return ARES_ENOMEM;
/* Set everything to distinguished values so we know they haven't
* been set yet.
*/
channel->flags = -1;
channel->timeout = -1;
channel->tries = -1;
channel->ndots = -1;
channel->udp_port = -1;
channel->tcp_port = -1;
channel->nservers = -1;
channel->ndomains = -1;
channel->nsort = -1;
channel->lookups = NULL;
channel->queries = NULL;
channel->domains = NULL;
channel->sortlist = NULL;
channel->sock_state_cb = NULL;
/* Initialize configuration by each of the four sources, from highest
* precedence to lowest.
*/
status = init_by_options(channel, options, optmask);
if (status == ARES_SUCCESS)
status = init_by_environment(channel);
if (status == ARES_SUCCESS)
status = init_by_resolv_conf(channel);
if (status == ARES_SUCCESS)
status = init_by_defaults(channel);
if (status != ARES_SUCCESS)
{
/* Something failed; clean up memory we may have allocated. */
if (channel->nservers != -1)
free(channel->servers);
if (channel->domains)
{
for (i = 0; i < channel->ndomains; i++)
free(channel->domains[i]);
free(channel->domains);
}
if (channel->sortlist)
free(channel->sortlist);
if(channel->lookups)
free(channel->lookups);
free(channel);
return status;
}
/* Trim to one server if ARES_FLAG_PRIMARY is set. */
if ((channel->flags & ARES_FLAG_PRIMARY) && channel->nservers > 1)
channel->nservers = 1;
/* Initialize server states. */
for (i = 0; i < channel->nservers; i++)
{
server = &channel->servers[i];
server->udp_socket = ARES_SOCKET_BAD;
server->tcp_socket = ARES_SOCKET_BAD;
server->tcp_lenbuf_pos = 0;
server->tcp_buffer = NULL;
server->qhead = NULL;
server->qtail = NULL;
}
/* Choose a somewhat random query ID. The main point is to avoid
* collisions with stale queries. An attacker trying to spoof a DNS
* answer also has to guess the query ID, but it's only a 16-bit
* field, so there's not much to be done about that.
*/
gettimeofday(&tv, NULL);
channel->next_id = (unsigned short)
(tv.tv_sec ^ tv.tv_usec ^ getpid()) & 0xffff;
channel->queries = NULL;
*channelptr = channel;
return ARES_SUCCESS;
}
static int init_by_options(ares_channel channel, struct ares_options *options,
int optmask)
{
int i;
/* Easy stuff. */
if ((optmask & ARES_OPT_FLAGS) && channel->flags == -1)
channel->flags = options->flags;
if ((optmask & ARES_OPT_TIMEOUT) && channel->timeout == -1)
channel->timeout = options->timeout;
if ((optmask & ARES_OPT_TRIES) && channel->tries == -1)
channel->tries = options->tries;
if ((optmask & ARES_OPT_NDOTS) && channel->ndots == -1)
channel->ndots = options->ndots;
if ((optmask & ARES_OPT_UDP_PORT) && channel->udp_port == -1)
channel->udp_port = options->udp_port;
if ((optmask & ARES_OPT_TCP_PORT) && channel->tcp_port == -1)
channel->tcp_port = options->tcp_port;
if ((optmask & ARES_OPT_SOCK_STATE_CB) && channel->sock_state_cb == NULL)
{
channel->sock_state_cb = options->sock_state_cb;
channel->sock_state_cb_data = options->sock_state_cb_data;
}
/* Copy the servers, if given. */
if ((optmask & ARES_OPT_SERVERS) && channel->nservers == -1)
{
channel->servers =
malloc(options->nservers * sizeof(struct server_state));
if (!channel->servers && options->nservers != 0)
return ARES_ENOMEM;
for (i = 0; i < options->nservers; i++)
channel->servers[i].addr = options->servers[i];
channel->nservers = options->nservers;
}
/* Copy the domains, if given. Keep channel->ndomains consistent so
* we can clean up in case of error.
*/
if ((optmask & ARES_OPT_DOMAINS) && channel->ndomains == -1)
{
channel->domains = malloc(options->ndomains * sizeof(char *));
if (!channel->domains && options->ndomains != 0)
return ARES_ENOMEM;
for (i = 0; i < options->ndomains; i++)
{
channel->ndomains = i;
channel->domains[i] = strdup(options->domains[i]);
if (!channel->domains[i])
return ARES_ENOMEM;
}
channel->ndomains = options->ndomains;
}
/* Set lookups, if given. */
if ((optmask & ARES_OPT_LOOKUPS) && !channel->lookups)
{
channel->lookups = strdup(options->lookups);
if (!channel->lookups)
return ARES_ENOMEM;
}
return ARES_SUCCESS;
}
static int init_by_environment(ares_channel channel)
{
const char *localdomain, *res_options;
int status;
localdomain = getenv("LOCALDOMAIN");
if (localdomain && channel->ndomains == -1)
{
status = set_search(channel, localdomain);
if (status != ARES_SUCCESS)
return status;
}
res_options = getenv("RES_OPTIONS");
if (res_options)
{
status = set_options(channel, res_options);
if (status != ARES_SUCCESS)
return status;
}
return ARES_SUCCESS;
}
#ifdef WIN32
/*
* Warning: returns a dynamically allocated buffer, the user MUST
* use free() if the function returns 1
*/
static int get_res_nt(HKEY hKey, const char *subkey, char **obuf)
{
/* Test for the size we need */
DWORD size = 0;
int result;
result = RegQueryValueEx(hKey, subkey, 0, NULL, NULL, &size);
if ((result != ERROR_SUCCESS && result != ERROR_MORE_DATA) || !size)
return 0;
*obuf = malloc(size+1);
if (!*obuf)
return 0;
if (RegQueryValueEx(hKey, subkey, 0, NULL,
(LPBYTE)*obuf, &size) != ERROR_SUCCESS)
{
free(*obuf);
return 0;
}
if (size == 1)
{
free(*obuf);
return 0;
}
return 1;
}
static int get_res_interfaces_nt(HKEY hKey, const char *subkey, char **obuf)
{
char enumbuf[39]; /* GUIDs are 38 chars + 1 for NULL */
DWORD enum_size = 39;
int idx = 0;
HKEY hVal;
while (RegEnumKeyEx(hKey, idx++, enumbuf, &enum_size, 0,
NULL, NULL, NULL) != ERROR_NO_MORE_ITEMS)
{
int rc;
enum_size = 39;
if (RegOpenKeyEx(hKey, enumbuf, 0, KEY_QUERY_VALUE, &hVal) !=
ERROR_SUCCESS)
continue;
rc = get_res_nt(hVal, subkey, obuf);
RegCloseKey(hVal);
if (rc)
return 1;
}
return 0;
}
static int get_iphlpapi_dns_info (char *ret_buf, size_t ret_size)
{
FIXED_INFO *fi = alloca (sizeof(*fi));
DWORD size = sizeof (*fi);
typedef DWORD (WINAPI* get_net_param_func) (FIXED_INFO*, DWORD*);
get_net_param_func GetNetworkParams; /* available only on Win-98/2000+ */
HMODULE handle;
IP_ADDR_STRING *ipAddr;
int i, count = 0;
int debug = 0;
size_t ip_size = sizeof("255.255.255.255,")-1;
size_t left = ret_size;
char *ret = ret_buf;
HRESULT res;
if (!fi)
return (0);
handle = LoadLibrary ("iphlpapi.dll");
if (!handle)
return (0);
GetNetworkParams = (get_net_param_func) GetProcAddress (handle, "GetNetworkParams");
if (!GetNetworkParams)
goto quit;
res = (*GetNetworkParams) (fi, &size);
if ((res != ERROR_BUFFER_OVERFLOW) && (res != ERROR_SUCCESS))
goto quit;
fi = alloca (size);
if (!fi || (*GetNetworkParams) (fi, &size) != ERROR_SUCCESS)
goto quit;
if (debug)
{
printf ("Host Name: %s\n", fi->HostName);
printf ("Domain Name: %s\n", fi->DomainName);
printf ("DNS Servers:\n"
" %s (primary)\n", fi->DnsServerList.IpAddress.String);
}
if (strlen(fi->DnsServerList.IpAddress.String) > 0 &&
inet_addr(fi->DnsServerList.IpAddress.String) != INADDR_NONE &&
left > ip_size)
{
ret += sprintf (ret, "%s,", fi->DnsServerList.IpAddress.String);
left -= ret - ret_buf;
count++;
}
for (i = 0, ipAddr = fi->DnsServerList.Next; ipAddr && left > ip_size;
ipAddr = ipAddr->Next, i++)
{
if (inet_addr(ipAddr->IpAddress.String) != INADDR_NONE)
{
ret += sprintf (ret, "%s,", ipAddr->IpAddress.String);
left -= ret - ret_buf;
count++;
}
if (debug)
printf (" %s (secondary %d)\n", ipAddr->IpAddress.String, i+1);
}
quit:
if (handle)
FreeLibrary (handle);
if (debug && left <= ip_size)
printf ("Too many nameservers. Truncating to %d addressess", count);
if (ret > ret_buf)
ret[-1] = '\0';
return (count);
}
#endif
static int init_by_resolv_conf(ares_channel channel)
{
char *line = NULL;
int status = -1, nservers = 0, nsort = 0;
struct server_state *servers = NULL;
struct apattern *sortlist = NULL;
#ifdef WIN32
/*
NameServer info via IPHLPAPI (IP helper API):
GetNetworkParams() should be the trusted source for this.
Available in Win-98/2000 and later. If that fail, fall-back to
registry information.
NameServer Registry:
On Windows 9X, the DNS server can be found in:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP\NameServer
On Windows NT/2000/XP/2003:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\NameServer
or
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DhcpNameServer
or
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\{AdapterID}\
NameServer
or
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\{AdapterID}\
DhcpNameServer
*/
HKEY mykey;
HKEY subkey;
DWORD data_type;
DWORD bytes;
DWORD result;
char buf[256];
if (channel->nservers > -1) /* don't override ARES_OPT_SERVER */
return ARES_SUCCESS;
if (get_iphlpapi_dns_info(buf,sizeof(buf)) > 0)
{
status = config_nameserver(&servers, &nservers, buf);
if (status == ARES_SUCCESS)
goto okay;
}
if (IS_NT())
{
if (RegOpenKeyEx(
HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0,
KEY_READ, &mykey
) == ERROR_SUCCESS)
{
RegOpenKeyEx(mykey, "Interfaces", 0,
KEY_QUERY_VALUE|KEY_ENUMERATE_SUB_KEYS, &subkey);
if (get_res_nt(mykey, NAMESERVER, &line))
{
status = config_nameserver(&servers, &nservers, line);
free(line);
}
else if (get_res_nt(mykey, DHCPNAMESERVER, &line))
{
status = config_nameserver(&servers, &nservers, line);
free(line);
}
/* Try the interfaces */
else if (get_res_interfaces_nt(subkey, NAMESERVER, &line))
{
status = config_nameserver(&servers, &nservers, line);
free(line);
}
else if (get_res_interfaces_nt(subkey, DHCPNAMESERVER, &line))
{
status = config_nameserver(&servers, &nservers, line);
free(line);
}
RegCloseKey(subkey);
RegCloseKey(mykey);
}
}
else
{
if (RegOpenKeyEx(
HKEY_LOCAL_MACHINE, WIN_NS_9X, 0,
KEY_READ, &mykey
) == ERROR_SUCCESS)
{
if ((result = RegQueryValueEx(
mykey, NAMESERVER, NULL, &data_type,
NULL, &bytes
)
) == ERROR_SUCCESS ||
result == ERROR_MORE_DATA)
{
if (bytes)
{
line = (char *)malloc(bytes+1);
if (RegQueryValueEx(mykey, NAMESERVER, NULL, &data_type,
(unsigned char *)line, &bytes) ==
ERROR_SUCCESS)
{
status = config_nameserver(&servers, &nservers, line);
}
free(line);
}
}
}
RegCloseKey(mykey);
}
if (status == ARES_SUCCESS)
status = ARES_EOF;
#elif defined(__riscos__)
/* Under RISC OS, name servers are listed in the
system variable Inet$Resolvers, space separated. */
line = getenv("Inet$Resolvers");
status = ARES_EOF;
if (line) {
char *resolvers = strdup(line), *pos, *space;
if (!resolvers)
return ARES_ENOMEM;
pos = resolvers;
do {
space = strchr(pos, ' ');
if (space)
*space = 0;
status = config_nameserver(&servers, &nservers, pos);
if (status != ARES_SUCCESS)
break;
pos = space + 1;
} while (space);
if (status == ARES_SUCCESS)
status = ARES_EOF;
free(resolvers);
}
#elif defined(WATT32)
int i;
sock_init();
for (i = 0; def_nameservers[i]; i++)
;
if (i == 0)
return ARES_SUCCESS; /* use localhost DNS server */
nservers = i;
servers = calloc(sizeof(*servers), i);
if (!servers)
return ARES_ENOMEM;
for (i = 0; def_nameservers[i]; i++)
servers[i].addr.s_addr = htonl(def_nameservers[i]);
status = ARES_EOF;
#else
{
char *p;
FILE *fp;
int linesize;
fp = fopen(PATH_RESOLV_CONF, "r");
if (!fp)
return (errno == ENOENT) ? ARES_SUCCESS : ARES_EFILE;
while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS)
{
if ((p = try_config(line, "domain")))
status = config_domain(channel, p);
else if ((p = try_config(line, "lookup")) && !channel->lookups)
status = config_lookup(channel, p, "bind", "file");
else if ((p = try_config(line, "search")))
status = set_search(channel, p);
else if ((p = try_config(line, "nameserver")) && channel->nservers == -1)
status = config_nameserver(&servers, &nservers, p);
else if ((p = try_config(line, "sortlist")) && channel->nsort == -1)
status = config_sortlist(&sortlist, &nsort, p);
else if ((p = try_config(line, "options")))
status = set_options(channel, p);
else
status = ARES_SUCCESS;
if (status != ARES_SUCCESS)
break;
}
fclose(fp);
if (!channel->lookups) {
/* Many systems (Solaris, Linux, BSD's) use nsswitch.conf */
fp = fopen("/etc/nsswitch.conf", "r");
if (fp) {
while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS)
{
if ((p = try_config(line, "hosts:")) && !channel->lookups)
status = config_lookup(channel, p, "dns", "files");
}
fclose(fp);
}
}
if (!channel->lookups) {
/* Linux / GNU libc 2.x and possibly others have host.conf */
fp = fopen("/etc/host.conf", "r");
if (fp) {
while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS)
{
if ((p = try_config(line, "order")) && !channel->lookups)
status = config_lookup(channel, p, "bind", "hosts");
}
fclose(fp);
}
}
if (!channel->lookups) {
/* Tru64 uses /etc/svc.conf */
fp = fopen("/etc/svc.conf", "r");
if (fp) {
while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS)
{
if ((p = try_config(line, "hosts=")) && !channel->lookups)
status = config_lookup(channel, p, "bind", "local");
}
fclose(fp);
}
}
if(line)
free(line);
}
#endif
/* Handle errors. */
if (status != ARES_EOF)
{
if (servers != NULL)
free(servers);
if (sortlist != NULL)
free(sortlist);
return status;
}
/* If we got any name server entries, fill them in. */
#ifdef WIN32
okay:
#endif
if (servers)
{
channel->servers = servers;
channel->nservers = nservers;
}
/* If we got any sortlist entries, fill them in. */
if (sortlist)
{
channel->sortlist = sortlist;
channel->nsort = nsort;
}
return ARES_SUCCESS;
}
static int init_by_defaults(ares_channel channel)
{
char hostname[MAXHOSTNAMELEN + 1];
if (channel->flags == -1)
channel->flags = 0;
if (channel->timeout == -1)
channel->timeout = DEFAULT_TIMEOUT;
if (channel->tries == -1)
channel->tries = DEFAULT_TRIES;
if (channel->ndots == -1)
channel->ndots = 1;
if (channel->udp_port == -1)
channel->udp_port = htons(NAMESERVER_PORT);
if (channel->tcp_port == -1)
channel->tcp_port = htons(NAMESERVER_PORT);
if (channel->nservers == -1)
{
/* If nobody specified servers, try a local named. */
channel->servers = malloc(sizeof(struct server_state));
if (!channel->servers)
return ARES_ENOMEM;
channel->servers[0].addr.s_addr = htonl(INADDR_LOOPBACK);
channel->nservers = 1;
}
if (channel->ndomains == -1)
{
/* Derive a default domain search list from the kernel hostname,
* or set it to empty if the hostname isn't helpful.
*/
if (gethostname(hostname, sizeof(hostname)) == -1
|| !strchr(hostname, '.'))
{
channel->domains = malloc(0);
channel->ndomains = 0;
}
else
{
channel->domains = malloc(sizeof(char *));
if (!channel->domains)
return ARES_ENOMEM;
channel->ndomains = 0;
channel->domains[0] = strdup(strchr(hostname, '.') + 1);
if (!channel->domains[0])
return ARES_ENOMEM;
channel->ndomains = 1;
}
}
if (channel->nsort == -1)
{
channel->sortlist = NULL;
channel->nsort = 0;
}
if (!channel->lookups)
{
channel->lookups = strdup("fb");
if (!channel->lookups)
return ARES_ENOMEM;
}
return ARES_SUCCESS;
}
#ifndef WIN32
static int config_domain(ares_channel channel, char *str)
{
char *q;
/* Set a single search domain. */
q = str;
while (*q && !isspace((unsigned char)*q))
q++;
*q = 0;
return set_search(channel, str);
}
static int config_lookup(ares_channel channel, const char *str,
const char *bindch, const char *filech)
{
char lookups[3], *l;
const char *p;
/* Set the lookup order. Only the first letter of each work
* is relevant, and it has to be "b" for DNS or "f" for the
* host file. Ignore everything else.
*/
l = lookups;
p = str;
while (*p)
{
if ((*p == *bindch || *p == *filech) && l < lookups + 2) {
if (*p == *bindch) *l++ = 'b';
else *l++ = 'f';
}
while (*p && !isspace((unsigned char)*p) && (*p != ','))
p++;
while (*p && (isspace((unsigned char)*p) || (*p == ',')))
p++;
}
*l = 0;
channel->lookups = strdup(lookups);
return (channel->lookups) ? ARES_SUCCESS : ARES_ENOMEM;
}
#endif
static int config_nameserver(struct server_state **servers, int *nservers,
char *str)
{
struct in_addr addr;
struct server_state *newserv;
/* On Windows, there may be more than one nameserver specified in the same
* registry key, so we parse it as a space or comma seperated list.
*/
#ifdef WIN32
char *p = str;
char *begin = str;
int more = 1;
while (more)
{
more = 0;
while (*p && !isspace(*p) && *p != ',')
p++;
if (*p)
{
*p = 0;
more = 1;
}
/* Skip multiple spaces or trailing spaces */
if (!*begin)
{
begin = ++p;
continue;
}
/* This is the part that actually sets the nameserver */
addr.s_addr = inet_addr(begin);
if (addr.s_addr == INADDR_NONE)
continue;
newserv = realloc(*servers, (*nservers + 1) * sizeof(struct server_state));
if (!newserv)
return ARES_ENOMEM;
newserv[*nservers].addr = addr;
*servers = newserv;
(*nservers)++;
if (!more)
break;
begin = ++p;
}
#else
/* Add a nameserver entry, if this is a valid address. */
addr.s_addr = inet_addr(str);
if (addr.s_addr == INADDR_NONE)
return ARES_SUCCESS;
newserv = realloc(*servers, (*nservers + 1) * sizeof(struct server_state));
if (!newserv)
return ARES_ENOMEM;
newserv[*nservers].addr = addr;
*servers = newserv;
(*nservers)++;
#endif
return ARES_SUCCESS;
}
#ifndef WIN32
static int config_sortlist(struct apattern **sortlist, int *nsort,
const char *str)
{
struct apattern pat;
const char *q;
/* Add sortlist entries. */
while (*str && *str != ';')
{
int bits;
char ipbuf[16], ipbufpfx[32];
/* Find just the IP */
q = str;
while (*q && *q != '/' && *q != ';' && !isspace((unsigned char)*q))
q++;
memcpy(ipbuf, str, (int)(q-str));
ipbuf[(int)(q-str)] = 0;
/* Find the prefix */
if (*q == '/')
{
const char *str2 = q+1;
while (*q && *q != ';' && !isspace((unsigned char)*q))
q++;
memcpy(ipbufpfx, str, (int)(q-str));
ipbufpfx[(int)(q-str)] = 0;
str = str2;
}
else
ipbufpfx[0] = 0;
/* Lets see if it is CIDR */
/* First we'll try IPv6 */
if ((bits = ares_inet_net_pton(AF_INET6, ipbufpfx ? ipbufpfx : ipbuf,
&pat.addr.addr6,
sizeof(pat.addr.addr6))) > 0)
{
pat.type = PATTERN_CIDR;
pat.mask.bits = bits;
pat.family = AF_INET6;
if (!sortlist_alloc(sortlist, nsort, &pat))
return ARES_ENOMEM;
}
if (ipbufpfx &&
(bits = ares_inet_net_pton(AF_INET, ipbufpfx, &pat.addr.addr4,
sizeof(pat.addr.addr4))) > 0)
{
pat.type = PATTERN_CIDR;
pat.mask.bits = bits;
pat.family = AF_INET;
if (!sortlist_alloc(sortlist, nsort, &pat))
return ARES_ENOMEM;
}
/* See if it is just a regular IP */
else if (ip_addr(ipbuf, (int)(q-str), &pat.addr.addr4) == 0)
{
if (ipbufpfx)
{
memcpy(ipbuf, str, (int)(q-str));
ipbuf[(int)(q-str)] = 0;
if (ip_addr(ipbuf, (int)(q - str), &pat.mask.addr.addr4) != 0)
natural_mask(&pat);
}
else
natural_mask(&pat);
pat.family = AF_INET;
pat.type = PATTERN_MASK;
if (!sortlist_alloc(sortlist, nsort, &pat))
return ARES_ENOMEM;
}
else
{
while (*q && *q != ';' && !isspace((unsigned char)*q))
q++;
}
str = q;
while (isspace((unsigned char)*str))
str++;
}
return ARES_SUCCESS;
}
#endif
static int set_search(ares_channel channel, const char *str)
{
int n;
const char *p, *q;
if(channel->ndomains != -1) {
/* if we already have some domains present, free them first */
for(n=0; n < channel->ndomains; n++)
free(channel->domains[n]);
free(channel->domains);
channel->ndomains = -1;
}
/* Count the domains given. */
n = 0;
p = str;
while (*p)
{
while (*p && !isspace((unsigned char)*p))
p++;
while (isspace((unsigned char)*p))
p++;
n++;
}
channel->domains = malloc(n * sizeof(char *));
if (!channel->domains && n)
return ARES_ENOMEM;
/* Now copy the domains. */
n = 0;
p = str;
while (*p)
{
channel->ndomains = n;
q = p;
while (*q && !isspace((unsigned char)*q))
q++;
channel->domains[n] = malloc(q - p + 1);
if (!channel->domains[n])
return ARES_ENOMEM;
memcpy(channel->domains[n], p, q - p);
channel->domains[n][q - p] = 0;
p = q;
while (isspace((unsigned char)*p))
p++;
n++;
}
channel->ndomains = n;
return ARES_SUCCESS;
}
static int set_options(ares_channel channel, const char *str)
{
const char *p, *q, *val;
p = str;
while (*p)
{
q = p;
while (*q && !isspace((unsigned char)*q))
q++;
val = try_option(p, q, "ndots:");
if (val && channel->ndots == -1)
channel->ndots = atoi(val);
val = try_option(p, q, "retrans:");
if (val && channel->timeout == -1)
channel->timeout = atoi(val);
val = try_option(p, q, "retry:");
if (val && channel->tries == -1)
channel->tries = atoi(val);
p = q;
while (isspace((unsigned char)*p))
p++;
}
return ARES_SUCCESS;
}
#ifndef WIN32
static char *try_config(char *s, const char *opt)
{
size_t len;
len = strlen(opt);
if (strncmp(s, opt, len) != 0 || !isspace((unsigned char)s[len]))
return NULL;
s += len;
while (isspace((unsigned char)*s))
s++;
return s;
}
#endif
static const char *try_option(const char *p, const char *q, const char *opt)
{
size_t len = strlen(opt);
return ((size_t)(q - p) > len && !strncmp(p, opt, len)) ? &p[len] : NULL;
}
#ifndef WIN32
static int sortlist_alloc(struct apattern **sortlist, int *nsort,
struct apattern *pat)
{
struct apattern *newsort;
newsort = realloc(*sortlist, (*nsort + 1) * sizeof(struct apattern));
if (!newsort)
return 0;
newsort[*nsort] = *pat;
*sortlist = newsort;
(*nsort)++;
return 1;
}
static int ip_addr(const char *ipbuf, int len, struct in_addr *addr)
{
/* Four octets and three periods yields at most 15 characters. */
if (len > 15)
return -1;
addr->s_addr = inet_addr(ipbuf);
if (addr->s_addr == INADDR_NONE && strcmp(ipbuf, "255.255.255.255") != 0)
return -1;
return 0;
}
static void natural_mask(struct apattern *pat)
{
struct in_addr addr;
/* Store a host-byte-order copy of pat in a struct in_addr. Icky,
* but portable.
*/
addr.s_addr = ntohl(pat->addr.addr4.s_addr);
/* This is out of date in the CIDR world, but some people might
* still rely on it.
*/
if (IN_CLASSA(addr.s_addr))
pat->mask.addr.addr4.s_addr = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(addr.s_addr))
pat->mask.addr.addr4.s_addr = htonl(IN_CLASSB_NET);
else
pat->mask.addr.addr4.s_addr = htonl(IN_CLASSC_NET);
}
#endif
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