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whois.c
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whois.c
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/*
* Copyright 1999-2010 by Marco d'Itri <[email protected]>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
/* for AI_IDN */
#define _GNU_SOURCE
/* System library */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include "config.h"
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#ifdef HAVE_GETOPT_LONG
#include <getopt.h>
#endif
#ifdef HAVE_REGEXEC
#include <regex.h>
#endif
#ifdef HAVE_LIBIDN
#include <idna.h>
#endif
#ifdef HAVE_INET_PTON
#include <arpa/inet.h>
#endif
/* Application-specific */
#include "version.h"
#include "data.h"
#include "whois.h"
#include "utils.h"
#ifdef HAVE_ICONV
#include "simple_recode.h"
#else
#define recode_fputs(a, b) fputs(a, b)
#endif
/* hack */
#define malloc(s) NOFAIL(malloc(s))
#define realloc(p, s) NOFAIL(realloc(p, s))
#ifdef strdup
#undef strdup
#define strdup(s) NOFAIL(__strdup(s))
#else
#define strdup(s) NOFAIL(strdup(s))
#endif
/* Global variables */
int sockfd, verb = 0;
#ifdef ALWAYS_HIDE_DISCL
int hide_discl = HIDE_NOT_STARTED;
#else
int hide_discl = HIDE_DISABLED;
#endif
const char *client_tag = IDSTRING;
#ifdef HAVE_GETOPT_LONG
static const struct option longopts[] = {
{"version", no_argument, NULL, 1 },
{"verbose", no_argument, NULL, 2 },
{"help", no_argument, NULL, 3 },
{"server", required_argument, NULL, 'h'},
{"host", required_argument, NULL, 'h'},
{"port", required_argument, NULL, 'p'},
{NULL, 0, NULL, 0 }
};
#else
extern char *optarg;
extern int optind;
#endif
int main(int argc, char *argv[])
{
int ch, nopar = 0, fstringlen = 64;
const char *server = NULL, *port = NULL;
char *qstring, *fstring;
int ret;
#ifdef ENABLE_NLS
setlocale(LC_ALL, "");
bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
textdomain(NLS_CAT_NAME);
#endif
fstring = malloc(fstringlen + 1);
*fstring = '\0';
/* prepend options from environment */
argv = merge_args(getenv("WHOIS_OPTIONS"), argv, &argc);
while ((ch = GETOPT_LONGISH(argc, argv,
"abBcdFg:Gh:Hi:KlLmMp:q:rRs:t:T:v:V:x", longopts, 0)) > 0) {
/* RIPE flags */
if (strchr(ripeflags, ch)) {
if (strlen(fstring) + 3 > fstringlen) {
fstringlen += 3;
fstring = realloc(fstring, fstringlen + 1);
}
sprintf(fstring + strlen(fstring), "-%c ", ch);
continue;
}
if (strchr(ripeflagsp, ch)) {
int flaglen = 3 + strlen(optarg) + 1;
if (strlen(fstring) + flaglen > fstringlen) {
fstringlen += flaglen;
fstring = realloc(fstring, fstringlen + 1);
}
sprintf(fstring + strlen(fstring), "-%c %s ", ch, optarg);
if (ch == 't' || ch == 'v' || ch == 'q')
nopar = 1;
continue;
}
/* program flags */
switch (ch) {
case 'h':
server = strdup(optarg);
break;
case 'V':
client_tag = optarg;
break;
case 'H':
hide_discl = HIDE_NOT_STARTED; /* enable disclaimers hiding */
break;
case 'p':
port = strdup(optarg);
break;
case 3:
usage(EXIT_SUCCESS);
case 2:
verb = 1;
break;
case 1:
fprintf(stdout, _("Version %s.\n\nReport bugs to %s.\n"),
VERSION, "<[email protected]>");
exit(EXIT_SUCCESS);
default:
usage(EXIT_FAILURE);
}
}
argc -= optind;
argv += optind;
if (argc == 0 && !nopar) /* there is no parameter */
usage(EXIT_FAILURE);
/* On some systems realloc only works on non-NULL buffers */
/* I wish I could remember which ones they are... */
qstring = malloc(64);
*qstring = '\0';
/* parse other parameters, if any */
if (!nopar) {
int qstringlen = 0;
while (1) {
qstringlen += strlen(*argv) + 1;
qstring = realloc(qstring, qstringlen + 1);
strcat(qstring, *argv++);
if (argc == 1)
break;
strcat(qstring, " ");
argc--;
}
}
signal(SIGTERM, sighandler);
signal(SIGINT, sighandler);
signal(SIGALRM, alarm_handler);
if (getenv("WHOIS_HIDE"))
hide_discl = HIDE_NOT_STARTED;
/* -v or -t has been used */
if (!server && !*qstring)
server = strdup("whois.ripe.net");
if (*qstring) {
char *tmp = normalize_domain(qstring);
free(qstring);
qstring = tmp;
}
#ifdef CONFIG_FILE
if (!server) {
server = match_config_file(qstring);
if (verb && server)
printf(_("Using server %s.\n"), server);
}
#endif
if (!server)
server = guess_server(qstring);
ret = handle_query(server, port, qstring, fstring);
exit(ret);
}
/*
* Server may be a server name from the command line, a server name got
* from guess_server or an encoded command/message from guess_server.
* This function has multiple memory leaks.
*/
int handle_query(const char *hserver, const char *hport,
const char *query, const char *flags)
{
char *server = NULL, *port = NULL;
char *p, *query_string;
if (hport) {
server = strdup(hserver);
port = strdup(hport);
} else if (hserver[0] < ' ')
server = strdup(hserver);
else
split_server_port(hserver, &server, &port);
retry:
switch (server[0]) {
case 0:
if (!(server = getenv("WHOIS_SERVER")))
server = strdup(DEFAULTSERVER);
break;
case 1:
puts(_("This TLD has no whois server, but you can access the "
"whois database at"));
puts(server + 1);
return 1;
case 3:
puts(_("This TLD has no whois server."));
return 1;
case 5:
puts(_("No whois server is known for this kind of object."));
return 1;
case 6:
puts(_("Unknown AS number or IP network. Please upgrade this program."));
return 1;
case 4:
if (verb)
printf(_("Using server %s.\n"), server + 1);
sockfd = openconn(server + 1, NULL);
free(server);
server = query_crsnic(sockfd, query);
break;
case 8:
if (verb)
printf(_("Using server %s.\n"), "whois.afilias-grs.info");
sockfd = openconn("whois.afilias-grs.info", NULL);
free(server);
server = query_afilias(sockfd, query);
break;
case 0x0A:
p = convert_6to4(query);
printf(_("\nQuerying for the IPv4 endpoint %s of a 6to4 IPv6 address.\n\n"), p);
free(server);
server = guess_server(p);
query = p;
goto retry;
case 0x0B:
p = convert_teredo(query);
printf(_("\nQuerying for the IPv4 endpoint %s of a Teredo IPv6 address.\n\n"), p);
free(server);
server = guess_server(p);
query = p;
goto retry;
case 0x0C:
p = convert_inaddr(query);
free(server);
server = guess_server(p);
free(p);
goto retry;
default:
break;
}
if (!server)
return 1;
query_string = queryformat(server, flags, query);
if (verb) {
printf(_("Using server %s.\n"), server);
printf(_("Query string: \"%s\"\n\n"), query_string);
}
sockfd = openconn(server, port);
server = do_query(sockfd, query_string);
free(query_string);
/* recursion is fun */
if (server && !strchr(query, ' ')) {
printf(_("\n\nFound a referral to %s.\n\n"), server);
handle_query(server, NULL, query, flags);
}
return 0;
}
#ifdef CONFIG_FILE
const char *match_config_file(const char *s)
{
FILE *fp;
char buf[512];
static const char delim[] = " \t";
if ((fp = fopen(CONFIG_FILE, "r")) == NULL) {
if (errno != ENOENT)
err_sys("Cannot open " CONFIG_FILE);
return NULL;
}
while (fgets(buf, sizeof(buf), fp) != NULL) {
char *p;
const char *pattern, *server;
#ifdef HAVE_REGEXEC
int i;
regex_t re;
#endif
if ((p = strpbrk(buf, "\r\n")))
*p = '\0';
p = buf;
while (*p == ' ' || *p == '\t') /* eat leading blanks */
p++;
if (!*p)
continue; /* skip empty lines */
if (*p == '#')
continue; /* skip comments */
pattern = strtok(p, delim);
server = strtok(NULL, delim);
if (!pattern || !server)
err_quit(_("Cannot parse this line: %s"), p);
p = strtok(NULL, delim);
if (p)
err_quit(_("Cannot parse this line: %s"), p);
#ifdef HAVE_REGEXEC
i = regcomp(&re, pattern, REG_EXTENDED | REG_ICASE | REG_NOSUB);
if (i != 0) {
char m[1024];
regerror(i, &re, m, sizeof(m));
err_quit("Invalid regular expression '%s': %s", pattern, m);
}
i = regexec(&re, s, 0, NULL, 0);
if (i == 0) {
regfree(&re);
fclose(fp);
return strdup(server);
}
if (i != REG_NOMATCH) {
char m[1024];
regerror(i, &re, m, sizeof(m));
err_quit("regexec: %s", m);
}
regfree(&re);
#else
if (domcmp(s, pattern)) {
fclose(fp);
return strdup(server);
}
#endif
}
fclose(fp);
return NULL;
}
#endif
/* Parses an user-supplied string and tries to guess the right whois server.
* Returns a dinamically allocated buffer.
*/
char *guess_server(const char *s)
{
unsigned long ip, as32;
unsigned int i;
const char *colon;
/* IPv6 address */
if ((colon = strchr(s, ':'))) {
unsigned long v6prefix, v6net;
/* RPSL hierarchical objects */
if (strncaseeq(s, "as", 2)) {
if (isasciidigit(s[2]))
return strdup(whereas(atol(s + 2)));
else
return strdup("");
}
v6prefix = strtol(s, NULL, 16);
if (v6prefix == 0)
return strdup("\x05"); /* unknown */
v6net = (v6prefix << 16) + strtol(colon + 1, NULL, 16);/* second u16 */
for (i = 0; ip6_assign[i].serv; i++) {
if ((v6net & (~0UL << (32 - ip6_assign[i].masklen)))
== ip6_assign[i].net)
return strdup(ip6_assign[i].serv);
}
return strdup("\x06"); /* unknown allocation */
}
/* email address */
if (strchr(s, '@'))
return strdup("\x05");
/* no dot and no hyphen means it's a NSI NIC handle or ASN (?) */
if (!strpbrk(s, ".-")) {
if (strncaseeq(s, "as", 2) && /* it's an AS */
(isasciidigit(s[2]) || s[2] == ' '))
return strdup(whereas(atol(s + 2)));
if (*s == '!') /* NSI NIC handle */
return strdup("whois.networksolutions.com");
else
return strdup("\x05"); /* probably a unknown kind of nic handle */
}
/* ASN32? */
if (strncaseeq(s, "as", 2) && s[2] && (as32 = asn32_to_long(s + 2)) != 0)
return strdup(whereas32(as32));
/* smells like an IP? */
#ifdef HAVE_INET_PTON
if (inet_pton(AF_INET, s, &ip) > 0) {
ip = ntohl(ip);
#else
if ((ip = myinet_aton(s))) {
#endif
for (i = 0; ip_assign[i].serv; i++)
if ((ip & ip_assign[i].mask) == ip_assign[i].net)
return strdup(ip_assign[i].serv);
return strdup("\x05"); /* not in the unicast IPv4 space */
}
/* check the TLDs list */
for (i = 0; tld_serv[i]; i += 2)
if (domcmp(s, tld_serv[i]))
return strdup(tld_serv[i + 1]);
/* no dot but hyphen */
if (!strchr(s, '.')) {
/* search for strings at the start of the word */
for (i = 0; nic_handles[i]; i += 2)
if (strncaseeq(s, nic_handles[i], strlen(nic_handles[i])))
return strdup(nic_handles[i + 1]);
/* it's probably a network name */
return strdup("");
}
/* has dot and maybe a hyphen and it's not in tld_serv[], WTF is it? */
/* either a TLD or a NIC handle we don't know about yet */
return strdup("\x05");
}
const char *whereas32(const unsigned long asn)
{
int i;
for (i = 0; as32_assign[i].serv; i++)
if (asn >= as32_assign[i].first && asn <= as32_assign[i].last)
return as32_assign[i].serv;
return "\x06";
}
const char *whereas(const unsigned long asn)
{
int i;
if (asn > 65535)
return whereas32(asn);
for (i = 0; as_assign[i].serv; i++)
if (asn >= as_assign[i].first && asn <= as_assign[i].last)
return as_assign[i].serv;
return "\x06";
}
/*
* Construct the query string.
* Determines the server character set as a side effect.
* Returns a malloc'ed string which needs to be freed by the caller.
*/
char *queryformat(const char *server, const char *flags, const char *query)
{
char *buf;
int i, isripe = 0;
/* 64 bytes reserved for server-specific flags added later */
buf = malloc(strlen(flags) + strlen(query) + strlen(client_tag) + 64);
*buf = '\0';
for (i = 0; ripe_servers[i]; i++)
if (streq(server, ripe_servers[i])) {
sprintf(buf + strlen(buf), "-V %s ", client_tag);
isripe = 1;
break;
}
if (*flags) {
if (!isripe)
puts(_("Warning: RIPE flags used with a traditional server."));
strcat(buf, flags);
}
#ifdef HAVE_ICONV
simple_recode_iconv_close();
for (i = 0; servers_charset[i].name; i++)
if (streq(server, servers_charset[i].name)) {
simple_recode_input_charset = servers_charset[i].charset;
if (servers_charset[i].options) {
strcat(buf, servers_charset[i].options);
strcat(buf, " ");
}
break;
}
#endif
#ifdef HAVE_LIBIDN
# define DENIC_PARAM_ACE ",ace"
#else
# define DENIC_PARAM_ACE ""
#endif
#ifdef HAVE_ICONV
# define DENIC_PARAM_CHARSET ""
#else
# define DENIC_PARAM_CHARSET " -C US-ASCII"
#endif
/* add useful default flags if there are no flags or multiple arguments */
if (isripe) { }
else if (strchr(query, ' ') || *flags) { }
else if (streq(server, "whois.denic.de") && domcmp(query, ".de"))
strcat(buf, "-T dn" DENIC_PARAM_ACE DENIC_PARAM_CHARSET " ");
else if (streq(server, "whois.dk-hostmaster.dk") && domcmp(query, ".dk"))
strcat(buf, "--show-handles ");
/* mangle and add the query string */
if (!isripe && streq(server, "whois.nic.ad.jp") &&
strncaseeq(query, "AS", 2) && isasciidigit(query[2])) {
strcat(buf, "AS ");
strcat(buf, query + 2);
}
else if (!isripe && streq(server, "whois.arin.net") &&
!strrchr(query, ' ')) {
if (strncaseeq(query, "AS", 2) && isasciidigit(query[2])) {
strcat(buf, "a ");
strcat(buf, query + 2);
} else if (myinet_aton(query) || strchr(query, ':')) {
strcat(buf, "n + ");
strcat(buf, query);
} else
strcat(buf, query);
}
else
strcat(buf, query);
/* ask for english text */
if (!isripe && (streq(server, "whois.nic.ad.jp") ||
streq(server, "whois.jprs.jp")) && japanese_locale())
strcat(buf, "/e");
return buf;
}
/* the first parameter contains the state of this simple state machine:
* HIDE_DISABLED: hidden text finished
* HIDE_NOT_STARTED: hidden text not seen yet
* >= 0: currently hiding message hide_strings[*hiding]
*/
int hide_line(int *hiding, const char *const line)
{
int i;
if (*hiding == HIDE_DISABLED) {
return 0;
} else if (*hiding == HIDE_NOT_STARTED) { /* looking for smtng to hide */
for (i = 0; hide_strings[i] != NULL; i += 2) {
if (strneq(line, hide_strings[i], strlen(hide_strings[i]))) {
*hiding = i; /* start hiding */
return 1; /* and hide this line */
}
}
return 0; /* don't hide this line */
} else if (*hiding > HIDE_NOT_STARTED) { /* hiding something */
if (*hide_strings[*hiding + 1] == '\0') { /*look for a blank line?*/
if (*line == '\n' || *line == '\r' || *line == '\0') {
*hiding = HIDE_DISABLED; /* stop hiding */
return 0; /* but do not hide the blank line */
}
} else { /*look for a matching string*/
if (strneq(line, hide_strings[*hiding + 1],
strlen(hide_strings[*hiding + 1]))) {
*hiding = HIDE_DISABLED; /* stop hiding */
return 1; /* but hide the last line */
}
}
return 1; /* we are hiding, so do it */
} else
return 0;
}
/* returns a string which should be freed by the caller, or NULL */
char *do_query(const int sock, const char *query)
{
char *temp, *p, buf[2000];
FILE *fi;
int hide = hide_discl;
char *referral_server = NULL;
temp = malloc(strlen(query) + 2 + 1);
strcpy(temp, query);
strcat(temp, "\r\n");
fi = fdopen(sock, "r");
if (write(sock, temp, strlen(temp)) < 0)
err_sys("write");
free(temp);
while (fgets(buf, sizeof(buf), fi)) {
/* 6bone-style referral:
* % referto: whois -h whois.arin.net -p 43 as 1
*/
if (!referral_server && strneq(buf, "% referto:", 10)) {
char nh[256], np[16], nq[1024];
if (sscanf(buf, REFERTO_FORMAT, nh, np, nq) == 3) {
/* XXX we are ignoring the new query string */
referral_server = malloc(strlen(nh) + 1 + strlen(np) + 1);
sprintf(referral_server, "%s:%s", nh, np);
}
}
/* ARIN referrals:
* ReferralServer: rwhois://rwhois.fuse.net:4321/
* ReferralServer: whois://whois.ripe.net
*/
if (!referral_server && strneq(buf, "ReferralServer:", 15)) {
if ((p = strstr(buf, "rwhois://")))
referral_server = strdup(p + 9);
else if ((p = strstr(buf, "whois://")))
referral_server = strdup(p + 8);
if (referral_server && (p = strpbrk(referral_server, "/\r\n")))
*p = '\0';
}
if (hide_line(&hide, buf))
continue;
if ((p = strpbrk(buf, "\r\n")))
*p = '\0';
recode_fputs(buf, stdout);
fputc('\n', stdout);
}
if (ferror(fi))
err_sys("fgets");
fclose(fi);
if (hide > HIDE_NOT_STARTED)
err_quit(_("Catastrophic error: disclaimer text has been changed.\n"
"Please upgrade this program.\n"));
return referral_server;
}
char *query_crsnic(const int sock, const char *query)
{
char *temp, *p, buf[2000];
FILE *fi;
int hide = hide_discl;
char *referral_server = NULL;
int state = 0;
temp = malloc(strlen(query) + 1 + 2 + 1);
*temp = '=';
strcpy(temp + 1, query);
strcat(temp, "\r\n");
fi = fdopen(sock, "r");
if (write(sock, temp, strlen(temp)) < 0)
err_sys("write");
free(temp);
while (fgets(buf, sizeof(buf), fi)) {
/* If there are multiple matches only the server of the first record
is queried */
if (state == 0 && strneq(buf, " Domain Name:", 15))
state = 1;
if (state == 1 && strneq(buf, " Whois Server:", 16)) {
for (p = buf; *p != ':'; p++); /* skip until colon */
for (p++; *p == ' '; p++); /* skip colon and spaces */
referral_server = strdup(p);
if ((p = strpbrk(referral_server, "\r\n ")))
*p = '\0';
state = 2;
}
/* the output must not be hidden or no data will be shown for
host records and not-existing domains */
if (hide_line(&hide, buf))
continue;
if ((p = strpbrk(buf, "\r\n")))
*p = '\0';
recode_fputs(buf, stdout);
fputc('\n', stdout);
}
if (ferror(fi))
err_sys("fgets");
fclose(fi);
return referral_server;
}
char *query_afilias(const int sock, const char *query)
{
char *temp, *p, buf[2000];
FILE *fi;
int hide = hide_discl;
char *referral_server = NULL;
int state = 0;
temp = malloc(strlen(query) + 2 + 1);
strcpy(temp, query);
strcat(temp, "\r\n");
fi = fdopen(sock, "r");
if (write(sock, temp, strlen(temp)) < 0)
err_sys("write");
free(temp);
while (fgets(buf, sizeof(buf), fi)) {
if (state == 0 && strneq(buf, "Domain Name:", 12))
state = 1;
if (state == 1 && strneq(buf, "Whois Server:", 13)) {
for (p = buf; *p != ':'; p++); /* skip until colon */
for (p++; *p == ' '; p++); /* skip colon and spaces */
referral_server = strdup(p);
if ((p = strpbrk(referral_server, "\r\n ")))
*p = '\0';
}
if (hide_line(&hide, buf))
continue;
if ((p = strpbrk(buf, "\r\n")))
*p = '\0';
recode_fputs(buf, stdout);
fputc('\n', stdout);
}
if (ferror(fi))
err_sys("fgets");
fclose(fi);
if (hide > HIDE_NOT_STARTED)
err_quit(_("Catastrophic error: disclaimer text has been changed.\n"
"Please upgrade this program.\n"));
return referral_server;
}
int openconn(const char *server, const char *port)
{
int fd = -1;
int timeout = 10;
#ifdef HAVE_GETADDRINFO
int err;
struct addrinfo hints, *res, *ai;
#else
struct hostent *hostinfo;
struct servent *servinfo;
struct sockaddr_in saddr;
#endif
alarm(60);
#ifdef HAVE_GETADDRINFO
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_ADDRCONFIG;
#ifdef HAVE_LIBIDN
hints.ai_flags |= AI_IDN;
#endif
if ((err = getaddrinfo(server, port ? port : "nicname", &hints, &res))
!= 0) {
if (err == EAI_SYSTEM)
err_sys("getaddrinfo(%s)", server);
else
err_quit("getaddrinfo(%s): %s", server, gai_strerror(err));
}
for (ai = res; ai; ai = ai->ai_next) {
/* no timeout for the last address. is this a good idea? */
if (!ai->ai_next)
timeout = 0;
if ((fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0)
continue; /* ignore */
if (connect_with_timeout(fd, (struct sockaddr *)ai->ai_addr,
ai->ai_addrlen, timeout) == 0)
break; /* success */
close(fd);
}
freeaddrinfo(res);
if (!ai)
err_sys("connect");
#else
if ((hostinfo = gethostbyname(server)) == NULL)
err_quit(_("Host %s not found."), server);
if ((fd = socket(PF_INET, SOCK_STREAM, IPPROTO_IP)) < 0)
err_sys("socket");
memset(&saddr, 0, sizeof(saddr));
saddr.sin_addr = *(struct in_addr *) hostinfo->h_addr;
saddr.sin_family = AF_INET;
if (!port) {
saddr.sin_port = htons(43);
} else if ((saddr.sin_port = htons(atoi(port))) == 0) {
if ((servinfo = getservbyname(port, "tcp")) == NULL)
err_quit(_("%s/tcp: unknown service"), port);
saddr.sin_port = servinfo->s_port;
}
if (connect_with_timeout(fd, (struct sockaddr *)&saddr, sizeof(saddr),
timeout) < 0)
err_sys("connect");
#endif
return fd;
}
int connect_with_timeout(int fd, const struct sockaddr *addr,
socklen_t addrlen, int timeout)
{
int savedflags, rc, connect_errno, opt;
unsigned int len;
fd_set fd_w;
struct timeval tv;
if (timeout <= 0)
return (connect(fd, addr, addrlen));
if ((savedflags = fcntl(fd, F_GETFL, 0)) < 0)
return -1;
/* set the socket non-blocking, so connect(2) will return immediately */
if (fcntl(fd, F_SETFL, savedflags | O_NONBLOCK) < 0)
return -1;
rc = connect(fd, addr, addrlen);
/* set the socket to block again */
connect_errno = errno;
if (fcntl(fd, F_SETFL, savedflags) < 0)
return -1;
errno = connect_errno;
if (rc == 0 || errno != EINPROGRESS)
return rc;
FD_ZERO(&fd_w);
FD_SET(fd, &fd_w);
tv.tv_sec = timeout;
tv.tv_usec = 0;
/* loop until an error or the timeout has expired */
do {
rc = select(fd + 1, NULL, &fd_w, NULL, &tv);
} while (rc == -1 && errno == EINTR);
if (rc == 0) { /* timed out */
errno = ETIMEDOUT;
return -1;
}
if (rc < 0 || rc > 1) /* select failed */
return rc;
/* rc == 1: success. check for errors */
len = sizeof(opt);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &opt, &len) < 0)
return -1;
/* and report them */
if (opt != 0) {
errno = opt;
return -1;
}
return 0;
}
void alarm_handler(int signum)
{
close(sockfd);
err_quit(_("Timeout."));
}
void sighandler(int signum)
{
close(sockfd);
err_quit(_("Interrupted by signal %d..."), signum);
}
int japanese_locale(void) {
char *lang;
lang = getenv("LC_MESSAGE");
if (lang) {
if (strneq(lang, "ja", 2))
return 0;
return 1;
}
lang = getenv("LANG");
if (lang && strneq(lang, "ja", 2))
return 0;
return 1;
}
/* check if dom ends with tld */
int domcmp(const char *dom, const char *tld)
{
const char *p, *q;
for (p = dom; *p; p++); p--; /* move to the last char */
for (q = tld; *q; q++); q--;
while (p >= dom && q >= tld && tolower(*p) == *q) { /* compare backwards */
if (q == tld) /* start of the second word? */
return 1;
p--; q--;
}
return 0;
}
/*
* Attempt to normalize a query by removing trailing dots and whitespace,
* then convert the domain to punycode.
* The function assumes that the domain is the last token of they query.
* Returns a malloc'ed string which needs to be freed by the caller.
*/
char *normalize_domain(const char *dom)
{
char *p, *ret;
#ifdef HAVE_LIBIDN
char *domain_start = NULL;
#endif
ret = strdup(dom);
/* eat trailing dots and blanks */
p = ret + strlen(ret);
for (; *p == '.' || *p == ' ' || *p == '\t' || p == ret; p--)
*p = '\0';
#ifdef HAVE_LIBIDN
/* find the start of the last word if there are spaces in the query */
for (p = ret; *p; p++)
if (*p == ' ')
domain_start = p + 1;
if (domain_start) {
char *q, *r;
int prefix_len;
if (idna_to_ascii_lz(domain_start, &q, 0) != IDNA_SUCCESS)
return ret;
/* reassemble the original query in a new buffer */
prefix_len = domain_start - ret;
r = malloc(prefix_len + strlen(q) + 1);
strncpy(r, ret, prefix_len);
r[prefix_len] = '\0';
strcat(r, q);
free(q);
free(ret);