mirror of
https://github.com/jart/cosmopolitan.git
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f8c0186221
__res_send returns the full answer length even if it didn't fit the buffer, but __dns_parse expects the length of the filled part of the buffer. Analogous to Musl commit 77327ed064bd57b0e1865cd0e0364057ff4a53b4 which fixed the only other __dns_parse call site.
252 lines
8 KiB
C
252 lines
8 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/sysdir.internal.h"
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#include "libc/calls/weirdtypes.h"
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#include "libc/fmt/conv.h"
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#include "libc/sock/in.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/ifreq.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "third_party/musl/lookup.internal.h"
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#include "third_party/musl/netdb.h"
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#include "third_party/musl/resolv.internal.h"
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__static_yoink("musl_libc_notice");
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#define PTR_MAX (64 + sizeof ".in-addr.arpa")
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#define RR_PTR 12
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static char *itoa(char *p, unsigned x) {
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p += 3*sizeof(int);
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*--p = 0;
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do {
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*--p = '0' + x % 10;
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x /= 10;
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} while (x);
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return p;
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}
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static void mkptr4(char *s, const unsigned char *ip)
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{
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sprintf(s, "%d.%d.%d.%d.in-addr.arpa",
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ip[3], ip[2], ip[1], ip[0]);
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}
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static void mkptr6(char *s, const unsigned char *ip)
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{
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static const char xdigits[] = "0123456789abcdef";
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int i;
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for (i=15; i>=0; i--) {
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*s++ = xdigits[ip[i]&15]; *s++ = '.';
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*s++ = xdigits[ip[i]>>4]; *s++ = '.';
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}
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strcpy(s, "ip6.arpa");
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}
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static void reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid, int family)
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{
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/* get path of /etc/hosts */
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char etc_hosts_buf[256];
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const char *etc_hosts_path =
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GetHostsTxtPath(etc_hosts_buf,
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sizeof(etc_hosts_buf));
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/* open hosts definitions file */
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unsigned char atmp[16];
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FILE *f = fopen(etc_hosts_path, "rbe");
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if (!f) return;
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if (family == AF_INET) {
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memcpy(atmp+12, a, 4);
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memcpy(atmp, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
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a = atmp;
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}
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/* read hosts definitions file */
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char line[512], *p, *z;
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struct address iplit;
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while (fgets(line, sizeof line, f)) {
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if ((p=strchr(line, '#'))) *p++='\n', *p=0;
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for (p=line; *p && !isspace(*p); p++);
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if (!*p) continue;
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*p++ = 0;
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if (__lookup_ipliteral(&iplit, line, AF_UNSPEC)<=0)
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continue;
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if (iplit.family == AF_INET) {
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memcpy(iplit.addr+12, iplit.addr, 4);
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memcpy(iplit.addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
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iplit.scopeid = 0;
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}
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if (memcmp(a, iplit.addr, 16) || iplit.scopeid != scopeid)
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continue;
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for (; *p && isspace(*p); p++);
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for (z=p; *z && !isspace(*z); z++);
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*z = 0;
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if (z-p < 256) {
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memcpy(buf, p, z-p+1);
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break;
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}
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}
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fclose(f);
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}
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static void reverse_services(char *buf, int port, int dgram)
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{
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/* get path of /etc/services */
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char etc_services_buf[256];
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const char *etc_services_path =
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GetServicesTxtPath(etc_services_buf,
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sizeof(etc_services_buf));
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/* open services definitions file */
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FILE *f = fopen(etc_services_path, "rbe");
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if (!f) return;
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/* read services definitions file */
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unsigned long svport;
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char line[128], *p, *z;
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while (fgets(line, sizeof line, f)) {
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if ((p=strchr(line, '#'))) *p++='\n', *p=0;
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for (p=line; *p && !isspace(*p); p++);
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if (!*p) continue;
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*p++ = 0;
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svport = strtoul(p, &z, 10);
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if (svport != port || z==p) continue;
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if (dgram && strncmp(z, "/udp", 4)) continue;
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if (!dgram && strncmp(z, "/tcp", 4)) continue;
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if (p-line > 32) continue;
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memcpy(buf, line, p-line);
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break;
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}
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fclose(f);
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}
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static int dns_parse_callback(void *c, int rr, const void *data, int len, const void *packet, int plen)
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{
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if (rr != RR_PTR) return 0;
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if (__dn_expand(packet, (const unsigned char *)packet + plen,
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data, c, 256) <= 0)
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*(char *)c = 0;
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return 0;
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}
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int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
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char *restrict node, socklen_t nodelen,
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char *restrict serv, socklen_t servlen,
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int flags)
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{
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char ptr[PTR_MAX];
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char buf[256], num[3*sizeof(int)+1];
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int af = sa->sa_family;
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unsigned char *a;
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unsigned scopeid;
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switch (af) {
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case AF_INET:
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a = (void *)&((struct sockaddr_in *)sa)->sin_addr;
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if (sl < sizeof(struct sockaddr_in)) return EAI_FAMILY;
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mkptr4(ptr, a);
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scopeid = 0;
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break;
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case AF_INET6:
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a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr;
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if (sl < sizeof(struct sockaddr_in6)) return EAI_FAMILY;
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if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12))
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mkptr6(ptr, a);
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else
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mkptr4(ptr, a+12);
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scopeid = ((struct sockaddr_in6 *)sa)->sin6_scope_id;
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break;
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default:
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return EAI_FAMILY;
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}
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if (node && nodelen) {
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buf[0] = 0;
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if (!(flags & NI_NUMERICHOST)) {
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reverse_hosts(buf, a, scopeid, af);
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}
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if (!*buf && !(flags & NI_NUMERICHOST)) {
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unsigned char query[18+PTR_MAX], reply[512];
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int qlen = __res_mkquery(0, ptr, 1, RR_PTR,
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0, 0, 0, query, sizeof query);
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query[3] = 0; /* don't need AD flag */
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int rlen = __res_send(query, qlen, reply, sizeof reply);
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buf[0] = 0;
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if (rlen > 0) {
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if (rlen > sizeof reply) rlen = sizeof reply;
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__dns_parse(reply, rlen, dns_parse_callback, buf);
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}
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}
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if (!*buf) {
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if (flags & NI_NAMEREQD) return EAI_NONAME;
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inet_ntop(af, a, buf, sizeof buf);
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if (scopeid) {
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#if 1
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/* TODO(jart): How do we handle this? */
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return EAI_NONAME;
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#else
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char *p = 0, tmp[IF_NAMESIZE+1];
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if (!(flags & NI_NUMERICSCOPE) &&
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(IN6_IS_ADDR_LINKLOCAL(a) ||
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IN6_IS_ADDR_MC_LINKLOCAL(a)))
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p = if_indextoname(scopeid, tmp+1);
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if (!p)
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p = itoa(num, scopeid);
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*--p = '%';
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strcat(buf, p);
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#endif
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}
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}
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if (strlen(buf) >= nodelen) return EAI_OVERFLOW;
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strcpy(node, buf);
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}
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if (serv && servlen) {
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char *p = buf;
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int port = ntohs(((struct sockaddr_in *)sa)->sin_port);
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buf[0] = 0;
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if (!(flags & NI_NUMERICSERV))
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reverse_services(buf, port, flags & NI_DGRAM);
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if (!*p)
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p = itoa(num, port);
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if (strlen(p) >= servlen)
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return EAI_OVERFLOW;
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strcpy(serv, p);
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}
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return 0;
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}
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