diff options
Diffstat (limited to 'deps/node/deps/cares/src/ares_init.c')
| -rw-r--r-- | deps/node/deps/cares/src/ares_init.c | 2615 |
1 files changed, 0 insertions, 2615 deletions
diff --git a/deps/node/deps/cares/src/ares_init.c b/deps/node/deps/cares/src/ares_init.c deleted file mode 100644 index c2c00d65..00000000 --- a/deps/node/deps/cares/src/ares_init.c +++ /dev/null @@ -1,2615 +0,0 @@ - -/* Copyright 1998 by the Massachusetts Institute of Technology. - * Copyright (C) 2007-2013 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_SYS_PARAM_H -#include <sys/param.h> -#endif - -#ifdef HAVE_NETINET_IN_H -#include <netinet/in.h> -#endif - -#ifdef HAVE_NETDB_H -#include <netdb.h> -#endif - -#ifdef HAVE_ARPA_INET_H -#include <arpa/inet.h> -#endif - -#ifdef HAVE_ARPA_NAMESER_H -# include <arpa/nameser.h> -#else -# include "nameser.h" -#endif -#ifdef HAVE_ARPA_NAMESER_COMPAT_H -# include <arpa/nameser_compat.h> -#endif - -#if defined(ANDROID) || defined(__ANDROID__) -#include <sys/system_properties.h> -#include "ares_android.h" -/* From the Bionic sources */ -#define DNS_PROP_NAME_PREFIX "net.dns" -#define MAX_DNS_PROPERTIES 8 -#endif - -#if defined(CARES_USE_LIBRESOLV) -#include <resolv.h> -#endif - -#include "ares.h" -#include "ares_inet_net_pton.h" -#include "ares_library_init.h" -#include "ares_nowarn.h" -#include "ares_platform.h" -#include "ares_private.h" - -#ifdef WATT32 -#undef WIN32 /* Redefined in MingW/MSVC headers */ -#endif - -static int init_by_options(ares_channel channel, - const 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); - -#ifndef WATT32 -static int config_nameserver(struct server_state **servers, int *nservers, - char *str); -#endif -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); -static int init_id_key(rc4_key* key,int key_data_len); - -static int config_sortlist(struct apattern **sortlist, int *nsort, - const char *str); -static int sortlist_alloc(struct apattern **sortlist, int *nsort, - struct apattern *pat); -static int ip_addr(const char *s, ares_ssize_t len, struct in_addr *addr); -static void natural_mask(struct apattern *pat); -#if !defined(WIN32) && !defined(WATT32) && \ - !defined(ANDROID) && !defined(__ANDROID__) && !defined(CARES_USE_LIBRESOLV) -static int config_domain(ares_channel channel, char *str); -static int config_lookup(ares_channel channel, const char *str, - const char *bindch, const char *altbindch, - const char *filech); -static char *try_config(char *s, const char *opt, char scc); -#endif - -#define ARES_CONFIG_CHECK(x) (x->lookups && x->nsort > -1 && \ - x->nservers > -1 && \ - x->ndomains > -1 && \ - x->ndots > -1 && x->timeout > -1 && \ - x->tries > -1) - -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; - int status = ARES_SUCCESS; - struct timeval now; - -#ifdef CURLDEBUG - const char *env = getenv("CARES_MEMDEBUG"); - - if (env) - curl_memdebug(env); - env = getenv("CARES_MEMLIMIT"); - if (env) { - char *endptr; - long num = strtol(env, &endptr, 10); - if((endptr != env) && (endptr == env + strlen(env)) && (num > 0)) - curl_memlimit(num); - } -#endif - - if (ares_library_initialized() != ARES_SUCCESS) - return ARES_ENOTINITIALIZED; /* LCOV_EXCL_LINE: n/a on non-WinSock */ - - channel = ares_malloc(sizeof(struct ares_channeldata)); - if (!channel) { - *channelptr = NULL; - return ARES_ENOMEM; - } - - now = ares__tvnow(); - - /* 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->rotate = -1; - channel->udp_port = -1; - channel->tcp_port = -1; - channel->ednspsz = -1; - channel->socket_send_buffer_size = -1; - channel->socket_receive_buffer_size = -1; - channel->nservers = -1; - channel->ndomains = -1; - channel->nsort = -1; - channel->tcp_connection_generation = 0; - channel->lookups = NULL; - channel->domains = NULL; - channel->sortlist = NULL; - channel->servers = NULL; - channel->sock_state_cb = NULL; - channel->sock_state_cb_data = NULL; - channel->sock_create_cb = NULL; - channel->sock_create_cb_data = NULL; - channel->sock_config_cb = NULL; - channel->sock_config_cb_data = NULL; - channel->sock_funcs = NULL; - channel->sock_func_cb_data = NULL; - channel->resolvconf_path = NULL; - - channel->last_server = 0; - channel->last_timeout_processed = (time_t)now.tv_sec; - - memset(&channel->local_dev_name, 0, sizeof(channel->local_dev_name)); - channel->local_ip4 = 0; - memset(&channel->local_ip6, 0, sizeof(channel->local_ip6)); - - /* Initialize our lists of queries */ - ares__init_list_head(&(channel->all_queries)); - for (i = 0; i < ARES_QID_TABLE_SIZE; i++) - { - ares__init_list_head(&(channel->queries_by_qid[i])); - } - for (i = 0; i < ARES_TIMEOUT_TABLE_SIZE; i++) - { - ares__init_list_head(&(channel->queries_by_timeout[i])); - } - - /* Initialize configuration by each of the four sources, from highest - * precedence to lowest. - */ - - status = init_by_options(channel, options, optmask); - if (status != ARES_SUCCESS) { - DEBUGF(fprintf(stderr, "Error: init_by_options failed: %s\n", - ares_strerror(status))); - /* If we fail to apply user-specified options, fail the whole init process */ - goto done; - } - status = init_by_environment(channel); - if (status != ARES_SUCCESS) - DEBUGF(fprintf(stderr, "Error: init_by_environment failed: %s\n", - ares_strerror(status))); - if (status == ARES_SUCCESS) { - status = init_by_resolv_conf(channel); - if (status != ARES_SUCCESS) - DEBUGF(fprintf(stderr, "Error: init_by_resolv_conf failed: %s\n", - ares_strerror(status))); - } - - /* - * No matter what failed or succeeded, seed defaults to provide - * useful behavior for things that we missed. - */ - status = init_by_defaults(channel); - if (status != ARES_SUCCESS) - DEBUGF(fprintf(stderr, "Error: init_by_defaults failed: %s\n", - ares_strerror(status))); - - /* Generate random key */ - - if (status == ARES_SUCCESS) { - status = init_id_key(&channel->id_key, ARES_ID_KEY_LEN); - if (status == ARES_SUCCESS) - channel->next_id = ares__generate_new_id(&channel->id_key); - else - DEBUGF(fprintf(stderr, "Error: init_id_key failed: %s\n", - ares_strerror(status))); - } - -done: - if (status != ARES_SUCCESS) - { - /* Something failed; clean up memory we may have allocated. */ - if (channel->servers) - ares_free(channel->servers); - if (channel->ndomains != -1) - ares_strsplit_free(channel->domains, channel->ndomains); - if (channel->sortlist) - ares_free(channel->sortlist); - if(channel->lookups) - ares_free(channel->lookups); - if(channel->resolvconf_path) - ares_free(channel->resolvconf_path); - ares_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; - - ares__init_servers_state(channel); - - *channelptr = channel; - return ARES_SUCCESS; -} - -/* ares_dup() duplicates a channel handle with all its options and returns a - new channel handle */ -int ares_dup(ares_channel *dest, ares_channel src) -{ - struct ares_options opts; - struct ares_addr_port_node *servers; - int non_v4_default_port = 0; - int i, rc; - int optmask; - - *dest = NULL; /* in case of failure return NULL explicitly */ - - /* First get the options supported by the old ares_save_options() function, - which is most of them */ - rc = ares_save_options(src, &opts, &optmask); - if(rc) - { - ares_destroy_options(&opts); - return rc; - } - - /* Then create the new channel with those options */ - rc = ares_init_options(dest, &opts, optmask); - - /* destroy the options copy to not leak any memory */ - ares_destroy_options(&opts); - - if(rc) - return rc; - - /* Now clone the options that ares_save_options() doesn't support. */ - (*dest)->sock_create_cb = src->sock_create_cb; - (*dest)->sock_create_cb_data = src->sock_create_cb_data; - (*dest)->sock_config_cb = src->sock_config_cb; - (*dest)->sock_config_cb_data = src->sock_config_cb_data; - (*dest)->sock_funcs = src->sock_funcs; - (*dest)->sock_func_cb_data = src->sock_func_cb_data; - - strncpy((*dest)->local_dev_name, src->local_dev_name, - sizeof((*dest)->local_dev_name)); - (*dest)->local_ip4 = src->local_ip4; - memcpy((*dest)->local_ip6, src->local_ip6, sizeof(src->local_ip6)); - - /* Full name server cloning required if there is a non-IPv4, or non-default port, nameserver */ - for (i = 0; i < src->nservers; i++) - { - if ((src->servers[i].addr.family != AF_INET) || - (src->servers[i].addr.udp_port != 0) || - (src->servers[i].addr.tcp_port != 0)) { - non_v4_default_port++; - break; - } - } - if (non_v4_default_port) { - rc = ares_get_servers_ports(src, &servers); - if (rc != ARES_SUCCESS) { - ares_destroy(*dest); - *dest = NULL; - return rc; - } - rc = ares_set_servers_ports(*dest, servers); - ares_free_data(servers); - if (rc != ARES_SUCCESS) { - ares_destroy(*dest); - *dest = NULL; - return rc; - } - } - - return ARES_SUCCESS; /* everything went fine */ -} - -/* Save options from initialized channel */ -int ares_save_options(ares_channel channel, struct ares_options *options, - int *optmask) -{ - int i, j; - int ipv4_nservers = 0; - - /* Zero everything out */ - memset(options, 0, sizeof(struct ares_options)); - - if (!ARES_CONFIG_CHECK(channel)) - return ARES_ENODATA; - - /* Traditionally the optmask wasn't saved in the channel struct so it was - recreated here. ROTATE is the first option that has no struct field of - its own in the public config struct */ - (*optmask) = (ARES_OPT_FLAGS|ARES_OPT_TRIES|ARES_OPT_NDOTS| - ARES_OPT_UDP_PORT|ARES_OPT_TCP_PORT|ARES_OPT_SOCK_STATE_CB| - ARES_OPT_SERVERS|ARES_OPT_DOMAINS|ARES_OPT_LOOKUPS| - ARES_OPT_SORTLIST|ARES_OPT_TIMEOUTMS); - (*optmask) |= (channel->rotate ? ARES_OPT_ROTATE : ARES_OPT_NOROTATE); - - if (channel->resolvconf_path) - (*optmask) |= ARES_OPT_RESOLVCONF; - - /* Copy easy stuff */ - options->flags = channel->flags; - - /* We return full millisecond resolution but that's only because we don't - set the ARES_OPT_TIMEOUT anymore, only the new ARES_OPT_TIMEOUTMS */ - options->timeout = channel->timeout; - options->tries = channel->tries; - options->ndots = channel->ndots; - options->udp_port = ntohs(aresx_sitous(channel->udp_port)); - options->tcp_port = ntohs(aresx_sitous(channel->tcp_port)); - options->sock_state_cb = channel->sock_state_cb; - options->sock_state_cb_data = channel->sock_state_cb_data; - - /* Copy IPv4 servers that use the default port */ - if (channel->nservers) { - for (i = 0; i < channel->nservers; i++) - { - if ((channel->servers[i].addr.family == AF_INET) && - (channel->servers[i].addr.udp_port == 0) && - (channel->servers[i].addr.tcp_port == 0)) - ipv4_nservers++; - } - if (ipv4_nservers) { - options->servers = ares_malloc(ipv4_nservers * sizeof(struct in_addr)); - if (!options->servers) - return ARES_ENOMEM; - for (i = j = 0; i < channel->nservers; i++) - { - if ((channel->servers[i].addr.family == AF_INET) && - (channel->servers[i].addr.udp_port == 0) && - (channel->servers[i].addr.tcp_port == 0)) - memcpy(&options->servers[j++], - &channel->servers[i].addr.addrV4, - sizeof(channel->servers[i].addr.addrV4)); - } - } - } - options->nservers = ipv4_nservers; - - /* copy domains */ - if (channel->ndomains) { - options->domains = ares_malloc(channel->ndomains * sizeof(char *)); - if (!options->domains) - return ARES_ENOMEM; - - for (i = 0; i < channel->ndomains; i++) - { - options->ndomains = i; - options->domains[i] = ares_strdup(channel->domains[i]); - if (!options->domains[i]) - return ARES_ENOMEM; - } - } - options->ndomains = channel->ndomains; - - /* copy lookups */ - if (channel->lookups) { - options->lookups = ares_strdup(channel->lookups); - if (!options->lookups && channel->lookups) - return ARES_ENOMEM; - } - - /* copy sortlist */ - if (channel->nsort) { - options->sortlist = ares_malloc(channel->nsort * sizeof(struct apattern)); - if (!options->sortlist) - return ARES_ENOMEM; - for (i = 0; i < channel->nsort; i++) - options->sortlist[i] = channel->sortlist[i]; - } - options->nsort = channel->nsort; - - /* copy path for resolv.conf file */ - if (channel->resolvconf_path) { - options->resolvconf_path = ares_strdup(channel->resolvconf_path); - if (!options->resolvconf_path) - return ARES_ENOMEM; - } - - return ARES_SUCCESS; -} - -static int init_by_options(ares_channel channel, - const 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_TIMEOUTMS) && channel->timeout == -1) - channel->timeout = options->timeout; - else if ((optmask & ARES_OPT_TIMEOUT) && channel->timeout == -1) - channel->timeout = options->timeout * 1000; - 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_ROTATE) && channel->rotate == -1) - channel->rotate = 1; - if ((optmask & ARES_OPT_NOROTATE) && channel->rotate == -1) - channel->rotate = 0; - if ((optmask & ARES_OPT_UDP_PORT) && channel->udp_port == -1) - channel->udp_port = htons(options->udp_port); - if ((optmask & ARES_OPT_TCP_PORT) && channel->tcp_port == -1) - channel->tcp_port = htons(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; - } - if ((optmask & ARES_OPT_SOCK_SNDBUF) - && channel->socket_send_buffer_size == -1) - channel->socket_send_buffer_size = options->socket_send_buffer_size; - if ((optmask & ARES_OPT_SOCK_RCVBUF) - && channel->socket_receive_buffer_size == -1) - channel->socket_receive_buffer_size = options->socket_receive_buffer_size; - - if ((optmask & ARES_OPT_EDNSPSZ) && channel->ednspsz == -1) - channel->ednspsz = options->ednspsz; - - /* Copy the IPv4 servers, if given. */ - if ((optmask & ARES_OPT_SERVERS) && channel->nservers == -1) - { - /* Avoid zero size allocations at any cost */ - if (options->nservers > 0) - { - channel->servers = - ares_malloc(options->nservers * sizeof(struct server_state)); - if (!channel->servers) - return ARES_ENOMEM; - for (i = 0; i < options->nservers; i++) - { - channel->servers[i].addr.family = AF_INET; - channel->servers[i].addr.udp_port = 0; - channel->servers[i].addr.tcp_port = 0; - memcpy(&channel->servers[i].addr.addrV4, - &options->servers[i], - sizeof(channel->servers[i].addr.addrV4)); - } - } - 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) - { - /* Avoid zero size allocations at any cost */ - if (options->ndomains > 0) - { - channel->domains = ares_malloc(options->ndomains * sizeof(char *)); - if (!channel->domains) - return ARES_ENOMEM; - for (i = 0; i < options->ndomains; i++) - { - channel->ndomains = i; - channel->domains[i] = ares_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 = ares_strdup(options->lookups); - if (!channel->lookups) - return ARES_ENOMEM; - } - - /* copy sortlist */ - if ((optmask & ARES_OPT_SORTLIST) && (channel->nsort == -1)) { - if (options->nsort > 0) { - channel->sortlist = ares_malloc(options->nsort * sizeof(struct apattern)); - if (!channel->sortlist) - return ARES_ENOMEM; - for (i = 0; i < options->nsort; i++) - channel->sortlist[i] = options->sortlist[i]; - } - channel->nsort = options->nsort; - } - - /* Set path for resolv.conf file, if given. */ - if ((optmask & ARES_OPT_RESOLVCONF) && !channel->resolvconf_path) - { - channel->resolvconf_path = ares_strdup(options->resolvconf_path); - if (!channel->resolvconf_path && options->resolvconf_path) - return ARES_ENOMEM; - } - - channel->optmask = optmask; - - 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; /* LCOV_EXCL_LINE: set_options() never fails */ - } - - return ARES_SUCCESS; -} - -#ifdef WIN32 -/* - * get_REG_SZ() - * - * Given a 'hKey' handle to an open registry key and a 'leafKeyName' pointer - * to the name of the registry leaf key to be queried, fetch it's string - * value and return a pointer in *outptr to a newly allocated memory area - * holding it as a null-terminated string. - * - * Returns 0 and nullifies *outptr upon inability to return a string value. - * - * Returns 1 and sets *outptr when returning a dynamically allocated string. - * - * Supported on Windows NT 3.5 and newer. - */ -static int get_REG_SZ(HKEY hKey, const char *leafKeyName, char **outptr) -{ - DWORD size = 0; - int res; - - *outptr = NULL; - - /* Find out size of string stored in registry */ - res = RegQueryValueExA(hKey, leafKeyName, 0, NULL, NULL, &size); - if ((res != ERROR_SUCCESS && res != ERROR_MORE_DATA) || !size) - return 0; - - /* Allocate buffer of indicated size plus one given that string - might have been stored without null termination */ - *outptr = ares_malloc(size+1); - if (!*outptr) - return 0; - - /* Get the value for real */ - res = RegQueryValueExA(hKey, leafKeyName, 0, NULL, - (unsigned char *)*outptr, &size); - if ((res != ERROR_SUCCESS) || (size == 1)) - { - ares_free(*outptr); - *outptr = NULL; - return 0; - } - - /* Null terminate buffer allways */ - *(*outptr + size) = '\0'; - - return 1; -} - -/* - * get_REG_SZ_9X() - * - * Functionally identical to get_REG_SZ() - * - * Supported on Windows 95, 98 and ME. - */ -static int get_REG_SZ_9X(HKEY hKey, const char *leafKeyName, char **outptr) -{ - DWORD dataType = 0; - DWORD size = 0; - int res; - - *outptr = NULL; - - /* Find out size of string stored in registry */ - res = RegQueryValueExA(hKey, leafKeyName, 0, &dataType, NULL, &size); - if ((res != ERROR_SUCCESS && res != ERROR_MORE_DATA) || !size) - return 0; - - /* Allocate buffer of indicated size plus one given that string - might have been stored without null termination */ - *outptr = ares_malloc(size+1); - if (!*outptr) - return 0; - - /* Get the value for real */ - res = RegQueryValueExA(hKey, leafKeyName, 0, &dataType, - (unsigned char *)*outptr, &size); - if ((res != ERROR_SUCCESS) || (size == 1)) - { - ares_free(*outptr); - *outptr = NULL; - return 0; - } - - /* Null terminate buffer allways */ - *(*outptr + size) = '\0'; - - return 1; -} - -/* - * get_enum_REG_SZ() - * - * Given a 'hKeyParent' handle to an open registry key and a 'leafKeyName' - * pointer to the name of the registry leaf key to be queried, parent key - * is enumerated searching in child keys for given leaf key name and its - * associated string value. When located, this returns a pointer in *outptr - * to a newly allocated memory area holding it as a null-terminated string. - * - * Returns 0 and nullifies *outptr upon inability to return a string value. - * - * Returns 1 and sets *outptr when returning a dynamically allocated string. - * - * Supported on Windows NT 3.5 and newer. - */ -static int get_enum_REG_SZ(HKEY hKeyParent, const char *leafKeyName, - char **outptr) -{ - char enumKeyName[256]; - DWORD enumKeyNameBuffSize; - DWORD enumKeyIdx = 0; - HKEY hKeyEnum; - int gotString; - int res; - - *outptr = NULL; - - for(;;) - { - enumKeyNameBuffSize = sizeof(enumKeyName); - res = RegEnumKeyExA(hKeyParent, enumKeyIdx++, enumKeyName, - &enumKeyNameBuffSize, 0, NULL, NULL, NULL); - if (res != ERROR_SUCCESS) - break; - res = RegOpenKeyExA(hKeyParent, enumKeyName, 0, KEY_QUERY_VALUE, - &hKeyEnum); - if (res != ERROR_SUCCESS) - continue; - gotString = get_REG_SZ(hKeyEnum, leafKeyName, outptr); - RegCloseKey(hKeyEnum); - if (gotString) - break; - } - - if (!*outptr) - return 0; - - return 1; -} - -/* - * get_DNS_Registry_9X() - * - * Functionally identical to get_DNS_Registry() - * - * Implementation supports Windows 95, 98 and ME. - */ -static int get_DNS_Registry_9X(char **outptr) -{ - HKEY hKey_VxD_MStcp; - int gotString; - int res; - - *outptr = NULL; - - res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, WIN_NS_9X, 0, KEY_READ, - &hKey_VxD_MStcp); - if (res != ERROR_SUCCESS) - return 0; - - gotString = get_REG_SZ_9X(hKey_VxD_MStcp, NAMESERVER, outptr); - RegCloseKey(hKey_VxD_MStcp); - - if (!gotString || !*outptr) - return 0; - - return 1; -} - -/* - * get_DNS_Registry_NT() - * - * Functionally identical to get_DNS_Registry() - * - * Refs: Microsoft Knowledge Base articles KB120642 and KB314053. - * - * Implementation supports Windows NT 3.5 and newer. - */ -static int get_DNS_Registry_NT(char **outptr) -{ - HKEY hKey_Interfaces = NULL; - HKEY hKey_Tcpip_Parameters; - int gotString; - int res; - - *outptr = NULL; - - res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0, KEY_READ, - &hKey_Tcpip_Parameters); - if (res != ERROR_SUCCESS) - return 0; - - /* - ** Global DNS settings override adapter specific parameters when both - ** are set. Additionally static DNS settings override DHCP-configured - ** parameters when both are set. - */ - - /* Global DNS static parameters */ - gotString = get_REG_SZ(hKey_Tcpip_Parameters, NAMESERVER, outptr); - if (gotString) - goto done; - - /* Global DNS DHCP-configured parameters */ - gotString = get_REG_SZ(hKey_Tcpip_Parameters, DHCPNAMESERVER, outptr); - if (gotString) - goto done; - - /* Try adapter specific parameters */ - res = RegOpenKeyExA(hKey_Tcpip_Parameters, "Interfaces", 0, - KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS, - &hKey_Interfaces); - if (res != ERROR_SUCCESS) - { - hKey_Interfaces = NULL; - goto done; - } - - /* Adapter specific DNS static parameters */ - gotString = get_enum_REG_SZ(hKey_Interfaces, NAMESERVER, outptr); - if (gotString) - goto done; - - /* Adapter specific DNS DHCP-configured parameters */ - gotString = get_enum_REG_SZ(hKey_Interfaces, DHCPNAMESERVER, outptr); - -done: - if (hKey_Interfaces) - RegCloseKey(hKey_Interfaces); - - RegCloseKey(hKey_Tcpip_Parameters); - - if (!gotString || !*outptr) - return 0; - - return 1; -} - -/* - * get_DNS_Registry() - * - * Locates DNS info in the registry. When located, this returns a pointer - * in *outptr to a newly allocated memory area holding a null-terminated - * string with a space or comma seperated list of DNS IP addresses. - * - * Returns 0 and nullifies *outptr upon inability to return DNSes string. - * - * Returns 1 and sets *outptr when returning a dynamically allocated string. - */ -static int get_DNS_Registry(char **outptr) -{ - win_platform platform; - int gotString = 0; - - *outptr = NULL; - - platform = ares__getplatform(); - - if (platform == WIN_NT) - gotString = get_DNS_Registry_NT(outptr); - else if (platform == WIN_9X) - gotString = get_DNS_Registry_9X(outptr); - - if (!gotString) - return 0; - - return 1; -} - -static void commanjoin(char** dst, const char* const src, const size_t len) -{ - char *newbuf; - size_t newsize; - - /* 1 for terminating 0 and 2 for , and terminating 0 */ - newsize = len + (*dst ? (strlen(*dst) + 2) : 1); - newbuf = ares_realloc(*dst, newsize); - if (!newbuf) - return; - if (*dst == NULL) - *newbuf = '\0'; - *dst = newbuf; - if (strlen(*dst) != 0) - strcat(*dst, ","); - strncat(*dst, src, len); -} - -/* - * commajoin() - * - * RTF code. - */ -static void commajoin(char **dst, const char *src) -{ - commanjoin(dst, src, strlen(src)); -} - -/* - * get_DNS_NetworkParams() - * - * Locates DNS info using GetNetworkParams() function from the Internet - * Protocol Helper (IP Helper) API. When located, this returns a pointer - * in *outptr to a newly allocated memory area holding a null-terminated - * string with a space or comma seperated list of DNS IP addresses. - * - * Returns 0 and nullifies *outptr upon inability to return DNSes string. - * - * Returns 1 and sets *outptr when returning a dynamically allocated string. - * - * Implementation supports Windows 98 and newer. - * - * Note: Ancient PSDK required in order to build a W98 target. - */ -static int get_DNS_NetworkParams(char **outptr) -{ - FIXED_INFO *fi, *newfi; - struct ares_addr namesrvr; - char *txtaddr; - IP_ADDR_STRING *ipAddr; - int res; - DWORD size = sizeof (*fi); - - *outptr = NULL; - - /* Verify run-time availability of GetNetworkParams() */ - if (ares_fpGetNetworkParams == ZERO_NULL) - return 0; - - fi = ares_malloc(size); - if (!fi) - return 0; - - res = (*ares_fpGetNetworkParams) (fi, &size); - if ((res != ERROR_BUFFER_OVERFLOW) && (res != ERROR_SUCCESS)) - goto done; - - newfi = ares_realloc(fi, size); - if (!newfi) - goto done; - - fi = newfi; - res = (*ares_fpGetNetworkParams) (fi, &size); - if (res != ERROR_SUCCESS) - goto done; - - for (ipAddr = &fi->DnsServerList; ipAddr; ipAddr = ipAddr->Next) - { - txtaddr = &ipAddr->IpAddress.String[0]; - - /* Validate converting textual address to binary format. */ - if (ares_inet_pton(AF_INET, txtaddr, &namesrvr.addrV4) == 1) - { - if ((namesrvr.addrV4.S_un.S_addr == INADDR_ANY) || - (namesrvr.addrV4.S_un.S_addr == INADDR_NONE)) - continue; - } - else if (ares_inet_pton(AF_INET6, txtaddr, &namesrvr.addrV6) == 1) - { - if (memcmp(&namesrvr.addrV6, &ares_in6addr_any, - sizeof(namesrvr.addrV6)) == 0) - continue; - } - else - continue; - - commajoin(outptr, txtaddr); - - if (!*outptr) - break; - } - -done: - if (fi) - ares_free(fi); - - if (!*outptr) - return 0; - - return 1; -} - -static BOOL ares_IsWindowsVistaOrGreater(void) -{ - OSVERSIONINFO vinfo; - memset(&vinfo, 0, sizeof(vinfo)); - vinfo.dwOSVersionInfoSize = sizeof(vinfo); -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable:4996) /* warning C4996: 'GetVersionExW': was declared deprecated */ -#endif - if (!GetVersionEx(&vinfo) || vinfo.dwMajorVersion < 6) - return FALSE; - return TRUE; -#ifdef _MSC_VER -#pragma warning(pop) -#endif -} - -/* A structure to hold the string form of IPv4 and IPv6 addresses so we can - * sort them by a metric. - */ -typedef struct -{ - /* The metric we sort them by. */ - ULONG metric; - - /* Original index of the item, used as a secondary sort parameter to make - * qsort() stable if the metrics are equal */ - size_t orig_idx; - - /* Room enough for the string form of any IPv4 or IPv6 address that - * ares_inet_ntop() will create. Based on the existing c-ares practice. - */ - char text[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; -} Address; - -/* Sort Address values \a left and \a right by metric, returning the usual - * indicators for qsort(). - */ -static int compareAddresses(const void *arg1, - const void *arg2) -{ - const Address * const left = arg1; - const Address * const right = arg2; - /* Lower metric the more preferred */ - if(left->metric < right->metric) return -1; - if(left->metric > right->metric) return 1; - /* If metrics are equal, lower original index more preferred */ - if(left->orig_idx < right->orig_idx) return -1; - if(left->orig_idx > right->orig_idx) return 1; - return 0; -} - -/* There can be multiple routes to "the Internet". And there can be different - * DNS servers associated with each of the interfaces that offer those routes. - * We have to assume that any DNS server can serve any request. But, some DNS - * servers may only respond if requested over their associated interface. But - * we also want to use "the preferred route to the Internet" whenever possible - * (and not use DNS servers on a non-preferred route even by forcing request - * to go out on the associated non-preferred interface). i.e. We want to use - * the DNS servers associated with the same interface that we would use to - * make a general request to anything else. - * - * But, Windows won't sort the DNS servers by the metrics associated with the - * routes and interfaces _even_ though it obviously sends IP packets based on - * those same routes and metrics. So, we must do it ourselves. - * - * So, we sort the DNS servers by the same metric values used to determine how - * an outgoing IP packet will go, thus effectively using the DNS servers - * associated with the interface that the DNS requests themselves will - * travel. This gives us optimal routing and avoids issues where DNS servers - * won't respond to requests that don't arrive via some specific subnetwork - * (and thus some specific interface). - * - * This function computes the metric we use to sort. On the interface - * identified by \a luid, it determines the best route to \a dest and combines - * that route's metric with \a interfaceMetric to compute a metric for the - * destination address on that interface. This metric can be used as a weight - * to sort the DNS server addresses associated with each interface (lower is - * better). - * - * Note that by restricting the route search to the specific interface with - * which the DNS servers are associated, this function asks the question "What - * is the metric for sending IP packets to this DNS server?" which allows us - * to sort the DNS servers correctly. - */ -static ULONG getBestRouteMetric(IF_LUID * const luid, /* Can't be const :( */ - const SOCKADDR_INET * const dest, - const ULONG interfaceMetric) -{ - /* On this interface, get the best route to that destination. */ - MIB_IPFORWARD_ROW2 row; - SOCKADDR_INET ignored; - if(!ares_fpGetBestRoute2 || - ares_fpGetBestRoute2(/* The interface to use. The index is ignored since we are - * passing a LUID. - */ - luid, 0, - /* No specific source address. */ - NULL, - /* Our destination address. */ - dest, - /* No options. */ - 0, - /* The route row. */ - &row, - /* The best source address, which we don't need. */ - &ignored) != NO_ERROR - /* If the metric is "unused" (-1) or too large for us to add the two - * metrics, use the worst possible, thus sorting this last. - */ - || row.Metric == (ULONG)-1 - || row.Metric > ((ULONG)-1) - interfaceMetric) { - /* Return the worst possible metric. */ - return (ULONG)-1; - } - - /* Return the metric value from that row, plus the interface metric. - * - * See - * http://msdn.microsoft.com/en-us/library/windows/desktop/aa814494(v=vs.85).aspx - * which describes the combination as a "sum". - */ - return row.Metric + interfaceMetric; -} - -/* - * get_DNS_AdaptersAddresses() - * - * Locates DNS info using GetAdaptersAddresses() function from the Internet - * Protocol Helper (IP Helper) API. When located, this returns a pointer - * in *outptr to a newly allocated memory area holding a null-terminated - * string with a space or comma seperated list of DNS IP addresses. - * - * Returns 0 and nullifies *outptr upon inability to return DNSes string. - * - * Returns 1 and sets *outptr when returning a dynamically allocated string. - * - * Implementation supports Windows XP and newer. - */ -#define IPAA_INITIAL_BUF_SZ 15 * 1024 -#define IPAA_MAX_TRIES 3 -static int get_DNS_AdaptersAddresses(char **outptr) -{ - IP_ADAPTER_DNS_SERVER_ADDRESS *ipaDNSAddr; - IP_ADAPTER_ADDRESSES *ipaa, *newipaa, *ipaaEntry; - ULONG ReqBufsz = IPAA_INITIAL_BUF_SZ; - ULONG Bufsz = IPAA_INITIAL_BUF_SZ; - ULONG AddrFlags = 0; - int trying = IPAA_MAX_TRIES; - int res; - - /* The capacity of addresses, in elements. */ - size_t addressesSize; - /* The number of elements in addresses. */ - size_t addressesIndex = 0; - /* The addresses we will sort. */ - Address *addresses; - - union { - struct sockaddr *sa; - struct sockaddr_in *sa4; - struct sockaddr_in6 *sa6; - } namesrvr; - - *outptr = NULL; - - /* Verify run-time availability of GetAdaptersAddresses() */ - if (ares_fpGetAdaptersAddresses == ZERO_NULL) - return 0; - - ipaa = ares_malloc(Bufsz); - if (!ipaa) - return 0; - - /* Start with enough room for a few DNS server addresses and we'll grow it - * as we encounter more. - */ - addressesSize = 4; - addresses = (Address*)ares_malloc(sizeof(Address) * addressesSize); - if(addresses == NULL) { - /* We need room for at least some addresses to function. */ - ares_free(ipaa); - return 0; - } - - /* Usually this call suceeds with initial buffer size */ - res = (*ares_fpGetAdaptersAddresses) (AF_UNSPEC, AddrFlags, NULL, - ipaa, &ReqBufsz); - if ((res != ERROR_BUFFER_OVERFLOW) && (res != ERROR_SUCCESS)) - goto done; - - while ((res == ERROR_BUFFER_OVERFLOW) && (--trying)) - { - if (Bufsz < ReqBufsz) - { - newipaa = ares_realloc(ipaa, ReqBufsz); - if (!newipaa) - goto done; - Bufsz = ReqBufsz; - ipaa = newipaa; - } - res = (*ares_fpGetAdaptersAddresses) (AF_UNSPEC, AddrFlags, NULL, - ipaa, &ReqBufsz); - if (res == ERROR_SUCCESS) - break; - } - if (res != ERROR_SUCCESS) - goto done; - - for (ipaaEntry = ipaa; ipaaEntry; ipaaEntry = ipaaEntry->Next) - { - if(ipaaEntry->OperStatus != IfOperStatusUp) - continue; - - /* For each interface, find any associated DNS servers as IPv4 or IPv6 - * addresses. For each found address, find the best route to that DNS - * server address _on_ _that_ _interface_ (at this moment in time) and - * compute the resulting total metric, just as Windows routing will do. - * Then, sort all the addresses found by the metric. - */ - for (ipaDNSAddr = ipaaEntry->FirstDnsServerAddress; - ipaDNSAddr; - ipaDNSAddr = ipaDNSAddr->Next) - { - namesrvr.sa = ipaDNSAddr->Address.lpSockaddr; - - if (namesrvr.sa->sa_family == AF_INET) - { - if ((namesrvr.sa4->sin_addr.S_un.S_addr == INADDR_ANY) || - (namesrvr.sa4->sin_addr.S_un.S_addr == INADDR_NONE)) - continue; - - /* Allocate room for another address, if necessary, else skip. */ - if(addressesIndex == addressesSize) { - const size_t newSize = addressesSize + 4; - Address * const newMem = - (Address*)ares_realloc(addresses, sizeof(Address) * newSize); - if(newMem == NULL) { - continue; - } - addresses = newMem; - addressesSize = newSize; - } - - /* Vista required for Luid or Ipv4Metric */ - if (ares_IsWindowsVistaOrGreater()) - { - /* Save the address as the next element in addresses. */ - addresses[addressesIndex].metric = - getBestRouteMetric(&ipaaEntry->Luid, - (SOCKADDR_INET*)(namesrvr.sa), - ipaaEntry->Ipv4Metric); - } - else - { - addresses[addressesIndex].metric = (ULONG)-1; - } - - /* Record insertion index to make qsort stable */ - addresses[addressesIndex].orig_idx = addressesIndex; - - if (! ares_inet_ntop(AF_INET, &namesrvr.sa4->sin_addr, - addresses[addressesIndex].text, - sizeof(addresses[0].text))) { - continue; - } - ++addressesIndex; - } - else if (namesrvr.sa->sa_family == AF_INET6) - { - if (memcmp(&namesrvr.sa6->sin6_addr, &ares_in6addr_any, - sizeof(namesrvr.sa6->sin6_addr)) == 0) - continue; - - /* Allocate room for another address, if necessary, else skip. */ - if(addressesIndex == addressesSize) { - const size_t newSize = addressesSize + 4; - Address * const newMem = - (Address*)ares_realloc(addresses, sizeof(Address) * newSize); - if(newMem == NULL) { - continue; - } - addresses = newMem; - addressesSize = newSize; - } - - /* Vista required for Luid or Ipv4Metric */ - if (ares_IsWindowsVistaOrGreater()) - { - /* Save the address as the next element in addresses. */ - addresses[addressesIndex].metric = - getBestRouteMetric(&ipaaEntry->Luid, - (SOCKADDR_INET*)(namesrvr.sa), - ipaaEntry->Ipv6Metric); - } - else - { - addresses[addressesIndex].metric = (ULONG)-1; - } - - /* Record insertion index to make qsort stable */ - addresses[addressesIndex].orig_idx = addressesIndex; - - if (! ares_inet_ntop(AF_INET6, &namesrvr.sa6->sin6_addr, - addresses[addressesIndex].text, - sizeof(addresses[0].text))) { - continue; - } - ++addressesIndex; - } - else { - /* Skip non-IPv4/IPv6 addresses completely. */ - continue; - } - } - } - - /* Sort all of the textual addresses by their metric (and original index if - * metrics are equal). */ - qsort(addresses, addressesIndex, sizeof(*addresses), compareAddresses); - - /* Join them all into a single string, removing duplicates. */ - { - size_t i; - for(i = 0; i < addressesIndex; ++i) { - size_t j; - /* Look for this address text appearing previously in the results. */ - for(j = 0; j < i; ++j) { - if(strcmp(addresses[j].text, addresses[i].text) == 0) { - break; - } - } - /* Iff we didn't emit this address already, emit it now. */ - if(j == i) { - /* Add that to outptr (if we can). */ - commajoin(outptr, addresses[i].text); - } - } - } - -done: - ares_free(addresses); - - if (ipaa) - ares_free(ipaa); - - if (!*outptr) { - return 0; - } - - return 1; -} - -/* - * get_DNS_Windows() - * - * Locates DNS info from Windows employing most suitable methods available at - * run-time no matter which Windows version it is. When located, this returns - * a pointer in *outptr to a newly allocated memory area holding a string with - * a space or comma seperated list of DNS IP addresses, null-terminated. - * - * Returns 0 and nullifies *outptr upon inability to return DNSes string. - * - * Returns 1 and sets *outptr when returning a dynamically allocated string. - * - * Implementation supports Windows 95 and newer. - */ -static int get_DNS_Windows(char **outptr) -{ - /* Try using IP helper API GetAdaptersAddresses(). IPv4 + IPv6, also sorts - * DNS servers by interface route metrics to try to use the best DNS server. */ - if (get_DNS_AdaptersAddresses(outptr)) - return 1; - - /* Try using IP helper API GetNetworkParams(). IPv4 only. */ - if (get_DNS_NetworkParams(outptr)) - return 1; - - /* Fall-back to registry information */ - return get_DNS_Registry(outptr); -} - -/* - * get_SuffixList_Windows() - * - * Reads the "DNS Suffix Search List" from registry and writes the list items - * whitespace separated to outptr. If the Search List is empty, the - * "Primary Dns Suffix" is written to outptr. - * - * Returns 0 and nullifies *outptr upon inability to return the suffix list. - * - * Returns 1 and sets *outptr when returning a dynamically allocated string. - * - * Implementation supports Windows Server 2003 and newer - */ -static int get_SuffixList_Windows(char **outptr) -{ - HKEY hKey, hKeyEnum; - char keyName[256]; - DWORD keyNameBuffSize; - DWORD keyIdx = 0; - char *p = NULL; - - *outptr = NULL; - - if (ares__getplatform() != WIN_NT) - return 0; - - /* 1. Global DNS Suffix Search List */ - if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0, - KEY_READ, &hKey) == ERROR_SUCCESS) - { - get_REG_SZ(hKey, SEARCHLIST_KEY, outptr); - if (get_REG_SZ(hKey, DOMAIN_KEY, &p)) - { - commajoin(outptr, p); - ares_free(p); - p = NULL; - } - RegCloseKey(hKey); - } - - if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, WIN_NT_DNSCLIENT, 0, - KEY_READ, &hKey) == ERROR_SUCCESS) - { - if (get_REG_SZ(hKey, SEARCHLIST_KEY, &p)) - { - commajoin(outptr, p); - ares_free(p); - p = NULL; - } - RegCloseKey(hKey); - } - - /* 2. Connection Specific Search List composed of: - * a. Primary DNS Suffix */ - if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, WIN_DNSCLIENT, 0, - KEY_READ, &hKey) == ERROR_SUCCESS) - { - if (get_REG_SZ(hKey, PRIMARYDNSSUFFIX_KEY, &p)) - { - commajoin(outptr, p); - ares_free(p); - p = NULL; - } - RegCloseKey(hKey); - } - - /* b. Interface SearchList, Domain, DhcpDomain */ - if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY "\\" INTERFACES_KEY, 0, - KEY_READ, &hKey) == ERROR_SUCCESS) - { - for(;;) - { - keyNameBuffSize = sizeof(keyName); - if (RegEnumKeyExA(hKey, keyIdx++, keyName, &keyNameBuffSize, - 0, NULL, NULL, NULL) - != ERROR_SUCCESS) - break; - if (RegOpenKeyExA(hKey, keyName, 0, KEY_QUERY_VALUE, &hKeyEnum) - != ERROR_SUCCESS) - continue; - /* p can be comma separated (SearchList) */ - if (get_REG_SZ(hKeyEnum, SEARCHLIST_KEY, &p)) - { - commajoin(outptr, p); - ares_free(p); - p = NULL; - } - if (get_REG_SZ(hKeyEnum, DOMAIN_KEY, &p)) - { - commajoin(outptr, p); - ares_free(p); - p = NULL; - } - if (get_REG_SZ(hKeyEnum, DHCPDOMAIN_KEY, &p)) - { - commajoin(outptr, p); - ares_free(p); - p = NULL; - } - RegCloseKey(hKeyEnum); - } - RegCloseKey(hKey); - } - - return *outptr != NULL; -} - -#endif - -static int init_by_resolv_conf(ares_channel channel) -{ -#if !defined(ANDROID) && !defined(__ANDROID__) && !defined(WATT32) && \ - !defined(CARES_USE_LIBRESOLV) - char *line = NULL; -#endif - int status = -1, nservers = 0, nsort = 0; - struct server_state *servers = NULL; - struct apattern *sortlist = NULL; - -#ifdef WIN32 - - if (channel->nservers > -1) /* don't override ARES_OPT_SERVER */ - return ARES_SUCCESS; - - if (get_DNS_Windows(&line)) - { - status = config_nameserver(&servers, &nservers, line); - ares_free(line); - } - - if (channel->ndomains == -1 && get_SuffixList_Windows(&line)) - { - status = set_search(channel, line); - ares_free(line); - } - - if (status == ARES_SUCCESS) - status = ARES_EOF; - else - /* Catch the case when all the above checks fail (which happens when there - is no network card or the cable is unplugged) */ - status = ARES_EFILE; - -#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 = ares_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; - - ares_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 = ares_malloc(sizeof(struct server_state)); - if (!servers) - return ARES_ENOMEM; - memset(servers, 0, sizeof(struct server_state)); - - for (i = 0; def_nameservers[i]; i++) - { - servers[i].addr.addrV4.s_addr = htonl(def_nameservers[i]); - servers[i].addr.family = AF_INET; - servers[i].addr.udp_port = 0; - servers[i].addr.tcp_port = 0; - } - status = ARES_EOF; - -#elif defined(ANDROID) || defined(__ANDROID__) - unsigned int i; - char propname[PROP_NAME_MAX]; - char propvalue[PROP_VALUE_MAX]=""; - char **dns_servers; - char *domains; - size_t num_servers; - - /* Use the Android connectivity manager to get a list - * of DNS servers. As of Android 8 (Oreo) net.dns# - * system properties are no longer available. Google claims this - * improves privacy. Apps now need the ACCESS_NETWORK_STATE - * permission and must use the ConnectivityManager which - * is Java only. */ - dns_servers = ares_get_android_server_list(MAX_DNS_PROPERTIES, &num_servers); - if (dns_servers != NULL) - { - for (i = 0; i < num_servers; i++) - { - status = config_nameserver(&servers, &nservers, dns_servers[i]); - if (status != ARES_SUCCESS) - break; - status = ARES_EOF; - } - for (i = 0; i < num_servers; i++) - { - ares_free(dns_servers[i]); - } - ares_free(dns_servers); - } - if (channel->ndomains == -1) - { - domains = ares_get_android_search_domains_list(); - set_search(channel, domains); - ares_free(domains); - } - -# ifdef HAVE___SYSTEM_PROPERTY_GET - /* Old way using the system property still in place as - * a fallback. Older android versions can still use this. - * it's possible for older apps not not have added the new - * permission and we want to try to avoid breaking those. - * - * We'll only run this if we don't have any dns servers - * because this will get the same ones (if it works). */ - if (status != ARES_EOF) { - for (i = 1; i <= MAX_DNS_PROPERTIES; i++) { - snprintf(propname, sizeof(propname), "%s%u", DNS_PROP_NAME_PREFIX, i); - if (__system_property_get(propname, propvalue) < 1) { - status = ARES_EOF; - break; - } - - status = config_nameserver(&servers, &nservers, propvalue); - if (status != ARES_SUCCESS) - break; - status = ARES_EOF; - } - } -# endif /* HAVE___SYSTEM_PROPERTY_GET */ -#elif defined(CARES_USE_LIBRESOLV) - struct __res_state res; - memset(&res, 0, sizeof(res)); - int result = res_ninit(&res); - if (result == 0 && (res.options & RES_INIT)) { - status = ARES_EOF; - - if (channel->nservers == -1) { - union res_sockaddr_union addr[MAXNS]; - int nscount = res_getservers(&res, addr, MAXNS); - for (int i = 0; i < nscount; ++i) { - char str[INET6_ADDRSTRLEN]; - int config_status; - sa_family_t family = addr[i].sin.sin_family; - if (family == AF_INET) { - ares_inet_ntop(family, &addr[i].sin.sin_addr, str, sizeof(str)); - } else if (family == AF_INET6) { - ares_inet_ntop(family, &addr[i].sin6.sin6_addr, str, sizeof(str)); - } else { - continue; - } - - config_status = config_nameserver(&servers, &nservers, str); - if (config_status != ARES_SUCCESS) { - status = config_status; - break; - } - } - } - if (channel->ndomains == -1) { - int entries = 0; - while ((entries < MAXDNSRCH) && res.dnsrch[entries]) - entries++; - - channel->domains = ares_malloc(entries * sizeof(char *)); - if (!channel->domains) { - status = ARES_ENOMEM; - } else { - channel->ndomains = entries; - for (int i = 0; i < channel->ndomains; ++i) { - channel->domains[i] = ares_strdup(res.dnsrch[i]); - if (!channel->domains[i]) - status = ARES_ENOMEM; - } - } - } - if (channel->ndots == -1) - channel->ndots = res.ndots; - if (channel->tries == -1) - channel->tries = res.retry; - if (channel->rotate == -1) - channel->rotate = res.options & RES_ROTATE; - if (channel->timeout == -1) - channel->timeout = res.retrans * 1000; - - res_ndestroy(&res); - } -#else - { - char *p; - FILE *fp; - size_t linesize; - int error; - int update_domains; - const char *resolvconf_path; - - /* Don't read resolv.conf and friends if we don't have to */ - if (ARES_CONFIG_CHECK(channel)) - return ARES_SUCCESS; - - /* Only update search domains if they're not already specified */ - update_domains = (channel->ndomains == -1); - - /* Support path for resolvconf filename set by ares_init_options */ - if(channel->resolvconf_path) { - resolvconf_path = channel->resolvconf_path; - } else { - resolvconf_path = PATH_RESOLV_CONF; - } - - fp = fopen(resolvconf_path, "r"); - if (fp) { - while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) - { - if ((p = try_config(line, "domain", ';')) && update_domains) - status = config_domain(channel, p); - else if ((p = try_config(line, "lookup", ';')) && !channel->lookups) - status = config_lookup(channel, p, "bind", NULL, "file"); - else if ((p = try_config(line, "search", ';')) && update_domains) - 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); - } - else { - error = ERRNO; - switch(error) { - case ENOENT: - case ESRCH: - status = ARES_EOF; - break; - default: - DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - error, strerror(error))); - DEBUGF(fprintf(stderr, "Error opening file: %s\n", PATH_RESOLV_CONF)); - status = ARES_EFILE; - } - } - - if ((status == ARES_EOF) && (!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:", '\0')) && !channel->lookups) - (void)config_lookup(channel, p, "dns", "resolve", "files"); - } - fclose(fp); - } - else { - error = ERRNO; - switch(error) { - case ENOENT: - case ESRCH: - break; - default: - DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - error, strerror(error))); - DEBUGF(fprintf(stderr, "Error opening file: %s\n", - "/etc/nsswitch.conf")); - } - - /* ignore error, maybe we will get luck in next if clause */ - status = ARES_EOF; - } - } - - if ((status == ARES_EOF) && (!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", '\0')) && !channel->lookups) - /* ignore errors */ - (void)config_lookup(channel, p, "bind", NULL, "hosts"); - } - fclose(fp); - } - else { - error = ERRNO; - switch(error) { - case ENOENT: - case ESRCH: - break; - default: - DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - error, strerror(error))); - DEBUGF(fprintf(stderr, "Error opening file: %s\n", - "/etc/host.conf")); - } - - /* ignore error, maybe we will get luck in next if clause */ - status = ARES_EOF; - } - } - - if ((status == ARES_EOF) && (!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=", '\0')) && !channel->lookups) - /* ignore errors */ - (void)config_lookup(channel, p, "bind", NULL, "local"); - } - fclose(fp); - } - else { - error = ERRNO; - switch(error) { - case ENOENT: - case ESRCH: - break; - default: - DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - error, strerror(error))); - DEBUGF(fprintf(stderr, "Error opening file: %s\n", "/etc/svc.conf")); - } - - /* ignore error, default value will be chosen for `channel->lookups` */ - status = ARES_EOF; - } - } - - if(line) - ares_free(line); - } - -#endif - - /* Handle errors. */ - if (status != ARES_EOF) - { - if (servers != NULL) - ares_free(servers); - if (sortlist != NULL) - ares_free(sortlist); - return status; - } - - /* If we got any name server entries, fill them in. */ - 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 = NULL; - int rc = ARES_SUCCESS; -#ifdef HAVE_GETHOSTNAME - char *dot; -#endif - - 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->rotate == -1) - channel->rotate = 0; - if (channel->udp_port == -1) - channel->udp_port = htons(NAMESERVER_PORT); - if (channel->tcp_port == -1) - channel->tcp_port = htons(NAMESERVER_PORT); - - if (channel->ednspsz == -1) - channel->ednspsz = EDNSPACKETSZ; - - if (channel->nservers == -1) { - /* If nobody specified servers, try a local named. */ - channel->servers = ares_malloc(sizeof(struct server_state)); - if (!channel->servers) { - rc = ARES_ENOMEM; - goto error; - } - channel->servers[0].addr.family = AF_INET; - channel->servers[0].addr.addrV4.s_addr = htonl(INADDR_LOOPBACK); - channel->servers[0].addr.udp_port = 0; - channel->servers[0].addr.tcp_port = 0; - channel->nservers = 1; - } - -#if defined(USE_WINSOCK) -#define toolong(x) (x == -1) && (SOCKERRNO == WSAEFAULT) -#elif defined(ENAMETOOLONG) -#define toolong(x) (x == -1) && ((SOCKERRNO == ENAMETOOLONG) || \ - (SOCKERRNO == EINVAL)) -#else -#define toolong(x) (x == -1) && (SOCKERRNO == EINVAL) -#endif - - 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. - */ -#ifndef HAVE_GETHOSTNAME - channel->ndomains = 0; /* default to none */ -#else - GETHOSTNAME_TYPE_ARG2 lenv = 64; - size_t len = 64; - int res; - channel->ndomains = 0; /* default to none */ - - hostname = ares_malloc(len); - if(!hostname) { - rc = ARES_ENOMEM; - goto error; - } - - do { - res = gethostname(hostname, lenv); - - if(toolong(res)) { - char *p; - len *= 2; - lenv *= 2; - p = ares_realloc(hostname, len); - if(!p) { - rc = ARES_ENOMEM; - goto error; - } - hostname = p; - continue; - } - else if(res) { - /* Lets not treat a gethostname failure as critical, since we - * are ok if gethostname doesn't even exist */ - *hostname = '\0'; - break; - } - - } while (res != 0); - - dot = strchr(hostname, '.'); - if (dot) { - /* a dot was found */ - channel->domains = ares_malloc(sizeof(char *)); - if (!channel->domains) { - rc = ARES_ENOMEM; - goto error; - } - channel->domains[0] = ares_strdup(dot + 1); - if (!channel->domains[0]) { - rc = ARES_ENOMEM; - goto error; - } - channel->ndomains = 1; - } -#endif - } - - if (channel->nsort == -1) { - channel->sortlist = NULL; - channel->nsort = 0; - } - - if (!channel->lookups) { - channel->lookups = ares_strdup("fb"); - if (!channel->lookups) - rc = ARES_ENOMEM; - } - - error: - if(rc) { - if(channel->servers) { - ares_free(channel->servers); - channel->servers = NULL; - } - - if(channel->domains && channel->domains[0]) - ares_free(channel->domains[0]); - if(channel->domains) { - ares_free(channel->domains); - channel->domains = NULL; - } - - if(channel->lookups) { - ares_free(channel->lookups); - channel->lookups = NULL; - } - - if(channel->resolvconf_path) { - ares_free(channel->resolvconf_path); - channel->resolvconf_path = NULL; - } - } - - if(hostname) - ares_free(hostname); - - return rc; -} - -#if !defined(WIN32) && !defined(WATT32) && \ - !defined(ANDROID) && !defined(__ANDROID__) && !defined(CARES_USE_LIBRESOLV) -static int config_domain(ares_channel channel, char *str) -{ - char *q; - - /* Set a single search domain. */ - q = str; - while (*q && !ISSPACE(*q)) - q++; - *q = '\0'; - return set_search(channel, str); -} - -#if defined(__INTEL_COMPILER) && (__INTEL_COMPILER == 910) && \ - defined(__OPTIMIZE__) && defined(__unix__) && defined(__i386__) - /* workaround icc 9.1 optimizer issue */ -# define vqualifier volatile -#else -# define vqualifier -#endif - -static int config_lookup(ares_channel channel, const char *str, - const char *bindch, const char *altbindch, - const char *filech) -{ - char lookups[3], *l; - const char *vqualifier p; - - if (altbindch == NULL) - altbindch = bindch; - - /* 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 == *altbindch || *p == *filech) && l < lookups + 2) { - if (*p == *bindch || *p == *altbindch) *l++ = 'b'; - else *l++ = 'f'; - } - while (*p && !ISSPACE(*p) && (*p != ',')) - p++; - while (*p && (ISSPACE(*p) || (*p == ','))) - p++; - } - *l = '\0'; - channel->lookups = ares_strdup(lookups); - return (channel->lookups) ? ARES_SUCCESS : ARES_ENOMEM; -} -#endif /* !WIN32 & !WATT32 & !ANDROID & !__ANDROID__ & !CARES_USE_LIBRESOLV */ - -#ifndef WATT32 -/* Validate that the ip address matches the subnet (network base and network - * mask) specified. Addresses are specified in standard Network Byte Order as - * 16 bytes, and the netmask is 0 to 128 (bits). - */ -static int ares_ipv6_subnet_matches(const unsigned char netbase[16], - unsigned char netmask, - const unsigned char ipaddr[16]) -{ - unsigned char mask[16] = { 0 }; - unsigned char i; - - /* Misuse */ - if (netmask > 128) - return 0; - - /* Quickly set whole bytes */ - memset(mask, 0xFF, netmask / 8); - - /* Set remaining bits */ - if(netmask % 8) { - mask[netmask / 8] = (unsigned char)(0xff << (8 - (netmask % 8))); - } - - for (i=0; i<16; i++) { - if ((netbase[i] & mask[i]) != (ipaddr[i] & mask[i])) - return 0; - } - - return 1; -} - -/* Return true iff the IPv6 ipaddr is blacklisted. */ -static int ares_ipv6_server_blacklisted(const unsigned char ipaddr[16]) -{ - /* A list of blacklisted IPv6 subnets. */ - const struct { - const unsigned char netbase[16]; - unsigned char netmask; - } blacklist[] = { - /* fec0::/10 was deprecated by [RFC3879] in September 2004. Formerly a - * Site-Local scoped address prefix. These are never valid DNS servers, - * but are known to be returned at least sometimes on Windows and Android. - */ - { - { - 0xfe, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 - }, - 10 - } - }; - size_t i; - - /* See if ipaddr matches any of the entries in the blacklist. */ - for (i = 0; i < sizeof(blacklist) / sizeof(blacklist[0]); ++i) { - if (ares_ipv6_subnet_matches( - blacklist[i].netbase, blacklist[i].netmask, ipaddr)) - return 1; - } - return 0; -} - -/* Add the IPv4 or IPv6 nameservers in str (separated by commas) to the - * servers list, updating servers and nservers as required. - * - * This will silently ignore blacklisted IPv6 nameservers as detected by - * ares_ipv6_server_blacklisted(). - * - * Returns an error code on failure, else ARES_SUCCESS. - */ -static int config_nameserver(struct server_state **servers, int *nservers, - char *str) -{ - struct ares_addr host; - struct server_state *newserv; - char *p, *txtaddr; - /* On Windows, there may be more than one nameserver specified in the same - * registry key, so we parse input as a space or comma seperated list. - */ - for (p = str; p;) - { - /* Skip whitespace and commas. */ - while (*p && (ISSPACE(*p) || (*p == ','))) - p++; - if (!*p) - /* No more input, done. */ - break; - - /* Pointer to start of IPv4 or IPv6 address part. */ - txtaddr = p; - - /* Advance past this address. */ - while (*p && !ISSPACE(*p) && (*p != ',')) - p++; - if (*p) - /* Null terminate this address. */ - *p++ = '\0'; - else - /* Reached end of input, done when this address is processed. */ - p = NULL; - - /* Convert textual address to binary format. */ - if (ares_inet_pton(AF_INET, txtaddr, &host.addrV4) == 1) - host.family = AF_INET; - else if (ares_inet_pton(AF_INET6, txtaddr, &host.addrV6) == 1 - /* Silently skip blacklisted IPv6 servers. */ - && !ares_ipv6_server_blacklisted( - (const unsigned char *)&host.addrV6)) - host.family = AF_INET6; - else - continue; - - /* Resize servers state array. */ - newserv = ares_realloc(*servers, (*nservers + 1) * - sizeof(struct server_state)); - if (!newserv) - return ARES_ENOMEM; - - /* Store address data. */ - newserv[*nservers].addr.family = host.family; - newserv[*nservers].addr.udp_port = 0; - newserv[*nservers].addr.tcp_port = 0; - if (host.family == AF_INET) - memcpy(&newserv[*nservers].addr.addrV4, &host.addrV4, - sizeof(host.addrV4)); - else - memcpy(&newserv[*nservers].addr.addrV6, &host.addrV6, - sizeof(host.addrV6)); - - /* Update arguments. */ - *servers = newserv; - *nservers += 1; - } - - return ARES_SUCCESS; -} -#endif /* !WATT32 */ - -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(*q)) - q++; - memcpy(ipbuf, str, q-str); - ipbuf[q-str] = '\0'; - /* Find the prefix */ - if (*q == '/') - { - const char *str2 = q+1; - while (*q && *q != ';' && !ISSPACE(*q)) - q++; - memcpy(ipbufpfx, str, q-str); - ipbufpfx[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[0] ? ipbufpfx : ipbuf, - &pat.addrV6, - sizeof(pat.addrV6))) > 0) - { - pat.type = PATTERN_CIDR; - pat.mask.bits = (unsigned short)bits; - pat.family = AF_INET6; - if (!sortlist_alloc(sortlist, nsort, &pat)) { - ares_free(*sortlist); - *sortlist = NULL; - return ARES_ENOMEM; - } - } - else if (ipbufpfx[0] && - (bits = ares_inet_net_pton(AF_INET, ipbufpfx, &pat.addrV4, - sizeof(pat.addrV4))) > 0) - { - pat.type = PATTERN_CIDR; - pat.mask.bits = (unsigned short)bits; - pat.family = AF_INET; - if (!sortlist_alloc(sortlist, nsort, &pat)) { - ares_free(*sortlist); - *sortlist = NULL; - return ARES_ENOMEM; - } - } - /* See if it is just a regular IP */ - else if (ip_addr(ipbuf, q-str, &pat.addrV4) == 0) - { - if (ipbufpfx[0]) - { - memcpy(ipbuf, str, q-str); - ipbuf[q-str] = '\0'; - if (ip_addr(ipbuf, q-str, &pat.mask.addr4) != 0) - natural_mask(&pat); - } - else - natural_mask(&pat); - pat.family = AF_INET; - pat.type = PATTERN_MASK; - if (!sortlist_alloc(sortlist, nsort, &pat)) { - ares_free(*sortlist); - *sortlist = NULL; - return ARES_ENOMEM; - } - } - else - { - while (*q && *q != ';' && !ISSPACE(*q)) - q++; - } - str = q; - while (ISSPACE(*str)) - str++; - } - - return ARES_SUCCESS; -} - -static int set_search(ares_channel channel, const char *str) -{ - size_t cnt; - - if(channel->ndomains != -1) { - /* LCOV_EXCL_START: all callers check ndomains == -1 */ - /* if we already have some domains present, free them first */ - ares_strsplit_free(channel->domains, channel->ndomains); - channel->domains = NULL; - channel->ndomains = -1; - } /* LCOV_EXCL_STOP */ - - channel->domains = ares_strsplit(str, ", ", 1, &cnt); - channel->ndomains = (int)cnt; - if (channel->domains == NULL || channel->ndomains == 0) { - channel->domains = NULL; - channel->ndomains = -1; - } - - 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(*q)) - q++; - val = try_option(p, q, "ndots:"); - if (val && channel->ndots == -1) - channel->ndots = aresx_sltosi(strtol(val, NULL, 10)); - val = try_option(p, q, "retrans:"); - if (val && channel->timeout == -1) - channel->timeout = aresx_sltosi(strtol(val, NULL, 10)); - val = try_option(p, q, "retry:"); - if (val && channel->tries == -1) - channel->tries = aresx_sltosi(strtol(val, NULL, 10)); - val = try_option(p, q, "rotate"); - if (val && channel->rotate == -1) - channel->rotate = 1; - p = q; - while (ISSPACE(*p)) - p++; - } - - return ARES_SUCCESS; -} - -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; -} - -#if !defined(WIN32) && !defined(WATT32) && \ - !defined(ANDROID) && !defined(__ANDROID__) && !defined(CARES_USE_LIBRESOLV) -static char *try_config(char *s, const char *opt, char scc) -{ - size_t len; - char *p; - char *q; - - if (!s || !opt) - /* no line or no option */ - return NULL; /* LCOV_EXCL_LINE */ - - /* Hash '#' character is always used as primary comment char, additionally - a not-NUL secondary comment char will be considered when specified. */ - - /* trim line comment */ - p = s; - if(scc) - while (*p && (*p != '#') && (*p != scc)) - p++; - else - while (*p && (*p != '#')) - p++; - *p = '\0'; - - /* trim trailing whitespace */ - q = p - 1; - while ((q >= s) && ISSPACE(*q)) - q--; - *++q = '\0'; - - /* skip leading whitespace */ - p = s; - while (*p && ISSPACE(*p)) - p++; - - if (!*p) - /* empty line */ - return NULL; - - if ((len = strlen(opt)) == 0) - /* empty option */ - return NULL; /* LCOV_EXCL_LINE */ - - if (strncmp(p, opt, len) != 0) - /* line and option do not match */ - return NULL; - - /* skip over given option name */ - p += len; - - if (!*p) - /* no option value */ - return NULL; /* LCOV_EXCL_LINE */ - - if ((opt[len-1] != ':') && (opt[len-1] != '=') && !ISSPACE(*p)) - /* whitespace between option name and value is mandatory - for given option names which do not end with ':' or '=' */ - return NULL; - - /* skip over whitespace */ - while (*p && ISSPACE(*p)) - p++; - - if (!*p) - /* no option value */ - return NULL; - - /* return pointer to option value */ - return p; -} -#endif /* !WIN32 & !WATT32 & !ANDROID & !__ANDROID__ */ - -static int ip_addr(const char *ipbuf, ares_ssize_t 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->addrV4.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.addr4.s_addr = htonl(IN_CLASSA_NET); - else if (IN_CLASSB(addr.s_addr)) - pat->mask.addr4.s_addr = htonl(IN_CLASSB_NET); - else - pat->mask.addr4.s_addr = htonl(IN_CLASSC_NET); -} - -static int sortlist_alloc(struct apattern **sortlist, int *nsort, - struct apattern *pat) -{ - struct apattern *newsort; - newsort = ares_realloc(*sortlist, (*nsort + 1) * sizeof(struct apattern)); - if (!newsort) - return 0; - newsort[*nsort] = *pat; - *sortlist = newsort; - (*nsort)++; - return 1; -} - -/* initialize an rc4 key. If possible a cryptographically secure random key - is generated using a suitable function (for example win32's RtlGenRandom as - described in - http://blogs.msdn.com/michael_howard/archive/2005/01/14/353379.aspx - otherwise the code defaults to cross-platform albeit less secure mechanism - using rand -*/ -static void randomize_key(unsigned char* key,int key_data_len) -{ - int randomized = 0; - int counter=0; -#ifdef WIN32 - BOOLEAN res; - if (ares_fpSystemFunction036) - { - res = (*ares_fpSystemFunction036) (key, key_data_len); - if (res) - randomized = 1; - } -#else /* !WIN32 */ -#ifdef RANDOM_FILE - FILE *f = fopen(RANDOM_FILE, "rb"); - if(f) { - counter = aresx_uztosi(fread(key, 1, key_data_len, f)); - fclose(f); - } -#endif -#endif /* WIN32 */ - - if (!randomized) { - for (;counter<key_data_len;counter++) - key[counter]=(unsigned char)(rand() % 256); /* LCOV_EXCL_LINE */ - } -} - -static int init_id_key(rc4_key* key,int key_data_len) -{ - unsigned char index1; - unsigned char index2; - unsigned char* state; - short counter; - unsigned char *key_data_ptr = 0; - - key_data_ptr = ares_malloc(key_data_len); - if (!key_data_ptr) - return ARES_ENOMEM; - memset(key_data_ptr, 0, key_data_len); - - state = &key->state[0]; - for(counter = 0; counter < 256; counter++) - /* unnecessary AND but it keeps some compilers happier */ - state[counter] = (unsigned char)(counter & 0xff); - randomize_key(key->state,key_data_len); - key->x = 0; - key->y = 0; - index1 = 0; - index2 = 0; - for(counter = 0; counter < 256; counter++) - { - index2 = (unsigned char)((key_data_ptr[index1] + state[counter] + - index2) % 256); - ARES_SWAP_BYTE(&state[counter], &state[index2]); - - index1 = (unsigned char)((index1 + 1) % key_data_len); - } - ares_free(key_data_ptr); - return ARES_SUCCESS; -} - -void ares_set_local_ip4(ares_channel channel, unsigned int local_ip) -{ - channel->local_ip4 = local_ip; -} - -/* local_ip6 should be 16 bytes in length */ -void ares_set_local_ip6(ares_channel channel, - const unsigned char* local_ip6) -{ - memcpy(&channel->local_ip6, local_ip6, sizeof(channel->local_ip6)); -} - -/* local_dev_name should be null terminated. */ -void ares_set_local_dev(ares_channel channel, - const char* local_dev_name) -{ - strncpy(channel->local_dev_name, local_dev_name, - sizeof(channel->local_dev_name)); - channel->local_dev_name[sizeof(channel->local_dev_name) - 1] = 0; -} - - -void ares_set_socket_callback(ares_channel channel, - ares_sock_create_callback cb, - void *data) -{ - channel->sock_create_cb = cb; - channel->sock_create_cb_data = data; -} - -void ares_set_socket_configure_callback(ares_channel channel, - ares_sock_config_callback cb, - void *data) -{ - channel->sock_config_cb = cb; - channel->sock_config_cb_data = data; -} - -void ares_set_socket_functions(ares_channel channel, - const struct ares_socket_functions * funcs, - void *data) -{ - channel->sock_funcs = funcs; - channel->sock_func_cb_data = data; -} - -int ares_set_sortlist(ares_channel channel, const char *sortstr) -{ - int nsort = 0; - struct apattern *sortlist = NULL; - int status; - - if (!channel) - return ARES_ENODATA; - - status = config_sortlist(&sortlist, &nsort, sortstr); - if (status == ARES_SUCCESS && sortlist) { - if (channel->sortlist) - ares_free(channel->sortlist); - channel->sortlist = sortlist; - channel->nsort = nsort; - } - return status; -} - -void ares__init_servers_state(ares_channel channel) -{ - struct server_state *server; - int i; - - 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_connection_generation = ++channel->tcp_connection_generation; - server->tcp_lenbuf_pos = 0; - server->tcp_buffer_pos = 0; - server->tcp_buffer = NULL; - server->tcp_length = 0; - server->qhead = NULL; - server->qtail = NULL; - ares__init_list_head(&server->queries_to_server); - server->channel = channel; - server->is_broken = 0; - } -} |