static int lib_hostfile_lookup(FAR const char *name, FAR struct hostent *host,
FAR char *buf, size_t buflen, int *h_errnop)
{
FAR FILE *stream;
int herrnocode;
int nread;
/* Search the hosts file for a match */
stream = fopen(CONFIG_NETDB_HOSTCONF_PATH, "r");
if (stream == NULL)
{
int errcode = errno;
ndbg("ERROR: Failed to open the hosts file %s: %d\n",
CONFIG_NETDB_HOSTCONF_PATH, errcode);
UNUSED(errcode);
herrnocode = NO_RECOVERY;
goto errorout_with_herrnocode;
}
/* Loop reading entries from the hosts file until a match is found or
* until we hit the end-of-file.
*/
do
{
/* Read the next entry from the hosts file */
nread = lib_parse_hostfile(stream, host, buf, buflen);
if (nread < 0)
{
/* Possible errors:
* ERANGE - Buffer not big enough
* ESPIPE - End of file (or possibly a read error).
* EAGAIN - Error parsing the line (E.g., missing hostname)
*/
if (nread == -ESPIPE)
{
nread = 0;
}
else if (nread != -EAGAIN)
{
herrnocode = NO_RECOVERY;
goto errorout_with_stream;
}
}
else if (nread > 0)
{
/* We successfully read the entry */
nvdbg("Comparing %s to %s\n", name, host->h_name);
/* Check for a host name match */
if (strcmp(name, host->h_name) == 0)
{
/* We have a match */
fclose(stream);
return OK;
}
/* For a match with any host alias */
if (host->h_aliases != NULL)
{
FAR char **alias;
for (alias = host->h_aliases; *alias != NULL; alias++)
{
/* Check for a host alias match */
if (strcmp(name, *alias) == 0)
{
/* We have a match */
fclose(stream);
return OK;
}
}
}
}
}
while (nread != 0);
/* We get here when the end of the hosts file is encountered without
* finding the hostname.
*/
herrnocode = HOST_NOT_FOUND;
errorout_with_stream:
fclose(stream);
errorout_with_herrnocode:
if (h_errnop)
{
*h_errnop = herrnocode;
}
return ERROR;
}
int lib_hostfile_lookup(FAR const void *addr, socklen_t len, int type,
FAR struct hostent *host, FAR char *buf,
size_t buflen, int *h_errnop)
{
FAR FILE *stream;
int herrnocode;
int nread;
/* Search the hosts file for a match */
stream = fopen(CONFIG_NETDB_HOSTCONF_PATH, "r");
if (stream == NULL)
{
int errcode = get_errno();
nerr("ERROR: Failed to open the hosts file %s: %d\n",
CONFIG_NETDB_HOSTCONF_PATH, errcode);
UNUSED(errcode);
herrnocode = NO_RECOVERY;
goto errorout_with_herrnocode;
}
/* Loop reading entries from the hosts file until a match is found or
* until we hit the end-of-file.
*/
do
{
/* Read the next entry from the hosts file */
nread = lib_parse_hostfile(stream, host, buf, buflen);
if (nread < 0)
{
/* Possible errors:
* ERANGE - Buffer not big enough
* ESPIPE - End of file (or possibly a read error).
* EAGAIN - Error parsing the line (E.g., missing hostname)
*/
if (nread == -ESPIPE)
{
nread = 0;
}
else if (nread != -EAGAIN)
{
herrnocode = NO_RECOVERY;
goto errorout_with_stream;
}
}
else if (nread > 0 && len == host->h_length && type == host->h_addrtype)
{
/* We successfully read the entry and the type and size of the
* address is good. Now compare the addresses:
*/
FAR char *hostaddr = host->h_addr;
if (hostaddr != NULL)
{
ninfo("Comparing addresses...\n");
if (memcmp(addr, hostaddr, len) == 0)
{
/* We have a match */
fclose(stream);
return OK;
}
}
}
}
while (nread != 0);
/* We get here when the end of the hosts file is encountered without
* finding the hostname.
*/
herrnocode = HOST_NOT_FOUND;
errorout_with_stream:
fclose(stream);
errorout_with_herrnocode:
if (h_errnop)
{
*h_errnop = herrnocode;
}
return ERROR;
}
