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libcares/ares_init.c  view on Meta::CPAN

#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));