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->nservers == -1) {
/* If nobody specified servers, try a local named. */
channel->servers = 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->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 = malloc(len);
if(!hostname) {
rc = ARES_ENOMEM;
goto error;
}
do {
res = gethostname(hostname, lenv);
if(toolong(res)) {
char *p;
len *= 2;
lenv *= 2;
p = realloc(hostname, len);
if(!p) {
rc = ARES_ENOMEM;
goto error;
}
hostname = p;
continue;
}
else if(res) {
rc = ARES_EBADNAME;
goto error;
}
} WHILE_FALSE;
dot = strchr(hostname, '.');
if (dot) {
/* a dot was found */
channel->domains = malloc(sizeof(char *));
if (!channel->domains) {
rc = ARES_ENOMEM;
goto error;
}
channel->domains[0] = strdup(dot + 1);
if (!channel->domains[0]) {
rc = ARES_ENOMEM;
goto error;
}
channel->ndomains = 1;
}
#endif
}
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->nservers == -1) {
/* If nobody specified servers, try a local named. */
channel->servers = 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->nservers = 1;
}
#ifdef ENAMETOOLONG
#define toolong(x) (x == -1) && ((ENAMETOOLONG == errno) || (EINVAL == errno))
#else
#define toolong(x) (x == -1) && (EINVAL == errno)
#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.
*/
size_t len = 64;
int res;
channel->ndomains = 0; /* default to none */
#ifdef HAVE_GETHOSTNAME
hostname = malloc(len);
if(!hostname) {
rc = ARES_ENOMEM;
goto error;
}
do {
res = gethostname(hostname, len);
if(toolong(res)) {
char *p;
len *= 2;
p = realloc(hostname, len);
if(!p) {
rc = ARES_ENOMEM;
goto error;
}
hostname = p;
continue;
}
else if(res) {
rc = ARES_EBADNAME;
goto error;
}
} while(0);
dot = strchr(hostname, '.');
if (dot) {
/* a dot was found */
channel->domains = malloc(sizeof(char *));
if (!channel->domains) {
rc = ARES_ENOMEM;
goto error;
}
channel->domains[0] = 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 = strdup("fb");
if (!channel->lookups)
rc = ARES_ENOMEM;
}
error:
if(rc) {
if(channel->servers)
free(channel->servers);
if(channel->domains && channel->domains[0])
free(channel->domains[0]);
if(channel->domains)
free(channel->domains);
if(channel->lookups)
free(channel->lookups);
}
if(hostname)
free(hostname);
return rc;
}
