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slant-dns.c
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slant-dns.c
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/* $Id$ */
/*
* Copyright (c) 2018 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#if HAVE_SYS_QUEUE
# include <sys/queue.h>
#endif
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#if HAVE_ERR
# include <err.h>
#endif
#include <limits.h>
#include <netdb.h>
#include <ncurses.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
#include "slant.h"
/*
* Parse the url in n->url into its component parts.
* This is a non-canonical parse that favours simplicity: we only want
* to know about the scheme, domain, username/password, port, and path
* (plus optional query string).
*/
void
dns_parse_url(struct out *out, struct node *n)
{
char *cp, *httpauth = NULL;
const char *s = n->url, *er;
size_t pos, targsz, srcsz;
int c;
n->addrs.https = 0;
n->addrs.port = 80;
/* Start with our scheme. */
if (0 == strncasecmp(s, "https://", 8)) {
n->addrs.https = 1;
n->addrs.port = 443;
s += 8;
} else if (0 == strncasecmp(s, "http://", 7))
s += 7;
if (NULL == (n->host = strdup(s)))
err(EXIT_FAILURE, NULL);
/*
* The path part starts with either a query string or path
* component.
*/
pos = strcspn(n->host, "?/");
if ('\0' != n->host[pos]) {
if (NULL == (n->path = strdup(&n->host[pos])))
err(EXIT_FAILURE, NULL);
n->host[pos] = '\0';
}
/*
* Do we have HTTP basic authentication enabled?
* If so, we need to reallocate the host to point after the
* authentication bits.
*/
if (NULL != (cp = strchr(n->host, '@'))) {
httpauth = n->host;
if (NULL == (n->host = strdup(cp + 1)))
err(EXIT_FAILURE, NULL);
*cp = '\0';
}
/* If we have a port, it would come after authentication. */
if (NULL != (cp = strchr(n->host, ':'))) {
n->addrs.port = strtonum
(cp + 1, 1, SHRT_MAX, &er);
if (NULL != er)
errx(EXIT_FAILURE, "%s: %s: %s",
n->url, cp + 1, er);
*cp = '\0';
}
if (NULL == n->path &&
NULL == (n->path = strdup("/")))
err(EXIT_FAILURE, NULL);
/* If we have HTTP authentication, then base64 encode now. */
if (NULL != httpauth) {
srcsz = strlen(httpauth);
targsz = ((srcsz + 2) / 3 * 4) + 1;
if (NULL == (n->httpauth = malloc(targsz)))
err(EXIT_FAILURE, NULL);
c = b64_ntop((const unsigned char *)httpauth,
srcsz, n->httpauth, targsz);
if (c < 0)
errx(EXIT_FAILURE, "b64_ntop");
free(httpauth);
}
}
/*
* This is a modified version of host_dns in config.c of OpenBSD's ntpd.
*/
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
int
dns_resolve(struct out *out, const char *host, struct dns *vec)
{
struct addrinfo hints, *res0, *res;
struct sockaddr *sa;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
error = getaddrinfo(host, NULL, &hints, &res0);
xdbg(out, "DNS resolving: %s", host);
if (error == EAI_AGAIN || error == EAI_NONAME) {
xwarnx(out, "DNS resolve error: %s: %s",
host, gai_strerror(error));
return 0;
} else if (error) {
xwarnx(out, "DNS parse error: %s: %s",
host, gai_strerror(error));
return 0;
}
for (vec->addrsz = 0, res = res0;
NULL != res && vec->addrsz < MAX_SERVERS_DNS;
res = res->ai_next) {
if (res->ai_family != AF_INET &&
res->ai_family != AF_INET6)
continue;
sa = res->ai_addr;
if (AF_INET == res->ai_family) {
vec->addrs[vec->addrsz].family = 4;
inet_ntop(AF_INET,
&(((struct sockaddr_in *)sa)->sin_addr),
vec->addrs[vec->addrsz].ip,
INET6_ADDRSTRLEN);
} else {
vec->addrs[vec->addrsz].family = 6;
inet_ntop(AF_INET6,
&(((struct sockaddr_in6 *)sa)->sin6_addr),
vec->addrs[vec->addrsz].ip,
INET6_ADDRSTRLEN);
}
xdbg(out, "DNS resolved: %s: %s",
host, vec->addrs[vec->addrsz].ip);
vec->addrsz++;
}
freeaddrinfo(res0);
return 1;
}