#include <netdb.h>
#include <limits.h>
-#include <stdlib.h>
#include <string.h>
#include <stdio.h>
+#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
-#include "__dns.h"
+#include <net/if.h>
+#include <ctype.h>
+#include <resolv.h>
+#include "lookup.h"
+#include "stdio_impl.h"
+
+#define PTR_MAX (64 + sizeof ".in-addr.arpa")
+#define RR_PTR 12
+
+static char *itoa(char *p, unsigned x) {
+ p += 3*sizeof(int);
+ *--p = 0;
+ do {
+ *--p = '0' + x % 10;
+ x /= 10;
+ } while (x);
+ return p;
+}
+
+static void mkptr4(char *s, const unsigned char *ip)
+{
+ sprintf(s, "%d.%d.%d.%d.in-addr.arpa",
+ ip[3], ip[2], ip[1], ip[0]);
+}
+
+static void mkptr6(char *s, const unsigned char *ip)
+{
+ static const char xdigits[] = "0123456789abcdef";
+ int i;
+ for (i=15; i>=0; i--) {
+ *s++ = xdigits[ip[i]&15]; *s++ = '.';
+ *s++ = xdigits[ip[i]>>4]; *s++ = '.';
+ }
+ strcpy(s, "ip6.arpa");
+}
+
+static void reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid, int family)
+{
+ char line[512], *p, *z;
+ unsigned char _buf[1032], atmp[16];
+ struct address iplit;
+ FILE _f, *f = __fopen_rb_ca("/etc/hosts", &_f, _buf, sizeof _buf);
+ if (!f) return;
+ if (family == AF_INET) {
+ memcpy(atmp+12, a, 4);
+ memcpy(atmp, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
+ a = atmp;
+ }
+ while (fgets(line, sizeof line, f)) {
+ if ((p=strchr(line, '#'))) *p++='\n', *p=0;
+
+ for (p=line; *p && !isspace(*p); p++);
+ *p++ = 0;
+ if (__lookup_ipliteral(&iplit, line, AF_UNSPEC)<=0)
+ continue;
+
+ if (iplit.family == AF_INET) {
+ memcpy(iplit.addr+12, iplit.addr, 4);
+ memcpy(iplit.addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
+ iplit.scopeid = 0;
+ }
-int getnameinfo(const struct sockaddr *sa, socklen_t sl,
- char *node, socklen_t nodelen,
- char *serv, socklen_t servlen,
+ if (memcmp(a, iplit.addr, 16) || iplit.scopeid != scopeid)
+ continue;
+
+ for (; *p && isspace(*p); p++);
+ for (z=p; *z && !isspace(*z); z++);
+ *z = 0;
+ if (z-p < 256) {
+ memcpy(buf, p, z-p+1);
+ break;
+ }
+ }
+ __fclose_ca(f);
+}
+
+static void reverse_services(char *buf, int port, int dgram)
+{
+ unsigned long svport;
+ char line[128], *p, *z;
+ unsigned char _buf[1032];
+ FILE _f, *f = __fopen_rb_ca("/etc/services", &_f, _buf, sizeof _buf);
+ if (!f) return;
+ while (fgets(line, sizeof line, f)) {
+ if ((p=strchr(line, '#'))) *p++='\n', *p=0;
+
+ for (p=line; *p && !isspace(*p); p++);
+ if (!*p) continue;
+ *p++ = 0;
+ svport = strtoul(p, &z, 10);
+
+ if (svport != port || z==p) continue;
+ if (dgram && strncmp(z, "/udp", 4)) continue;
+ if (!dgram && strncmp(z, "/tcp", 4)) continue;
+ if (p-line > 32) continue;
+
+ memcpy(buf, line, p-line);
+ break;
+ }
+ __fclose_ca(f);
+}
+
+static int dns_parse_callback(void *c, int rr, const void *data, int len, const void *packet, int plen)
+{
+ if (rr != RR_PTR) return 0;
+ if (__dn_expand(packet, (const unsigned char *)packet + plen,
+ data, c, 256) <= 0)
+ *(char *)c = 0;
+ return 0;
+
+}
+
+int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
+ char *restrict node, socklen_t nodelen,
+ char *restrict serv, socklen_t servlen,
int flags)
{
- char buf[256];
- unsigned char reply[512];
+ char ptr[PTR_MAX];
+ char buf[256], num[3*sizeof(int)+1];
int af = sa->sa_family;
unsigned char *a;
+ unsigned scopeid;
switch (af) {
case AF_INET:
a = (void *)&((struct sockaddr_in *)sa)->sin_addr;
- if (sl != sizeof(struct sockaddr_in)) return EAI_FAMILY;
+ if (sl < sizeof(struct sockaddr_in)) return EAI_FAMILY;
+ mkptr4(ptr, a);
+ scopeid = 0;
break;
case AF_INET6:
a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr;
- if (sl != sizeof(struct sockaddr_in6)) return EAI_FAMILY;
+ if (sl < sizeof(struct sockaddr_in6)) return EAI_FAMILY;
+ if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12))
+ mkptr6(ptr, a);
+ else
+ mkptr4(ptr, a+12);
+ scopeid = ((struct sockaddr_in6 *)sa)->sin6_scope_id;
break;
default:
return EAI_FAMILY;
}
if (node && nodelen) {
- if ((flags & NI_NUMERICHOST)
- || __dns_query(reply, a, af, 1) <= 0
- || __dns_get_rr(buf, 0, 256, 1, reply, RR_PTR, 1) <= 0)
- {
+ buf[0] = 0;
+ if (!(flags & NI_NUMERICHOST)) {
+ reverse_hosts(buf, a, scopeid, af);
+ }
+ if (!*buf && !(flags & NI_NUMERICHOST)) {
+ unsigned char query[18+PTR_MAX], reply[512];
+ int qlen = __res_mkquery(0, ptr, 1, RR_PTR,
+ 0, 0, 0, query, sizeof query);
+ query[3] = 0; /* don't need AD flag */
+ int rlen = __res_send(query, qlen, reply, sizeof reply);
+ buf[0] = 0;
+ if (rlen > 0)
+ __dns_parse(reply, rlen, dns_parse_callback, buf);
+ }
+ if (!*buf) {
if (flags & NI_NAMEREQD) return EAI_NONAME;
inet_ntop(af, a, buf, sizeof buf);
+ if (scopeid) {
+ char *p = 0, tmp[IF_NAMESIZE+1];
+ if (!(flags & NI_NUMERICSCOPE) &&
+ (IN6_IS_ADDR_LINKLOCAL(a) ||
+ IN6_IS_ADDR_MC_LINKLOCAL(a)))
+ p = if_indextoname(scopeid, tmp+1);
+ if (!p)
+ p = itoa(num, scopeid);
+ *--p = '%';
+ strcat(buf, p);
+ }
}
if (strlen(buf) >= nodelen) return EAI_OVERFLOW;
strcpy(node, buf);
}
if (serv && servlen) {
- if (snprintf(buf, sizeof buf, "%d",
- ntohs(((struct sockaddr_in *)sa)->sin_port))>=servlen)
+ char *p = buf;
+ int port = ntohs(((struct sockaddr_in *)sa)->sin_port);
+ buf[0] = 0;
+ if (!(flags & NI_NUMERICSERV))
+ reverse_services(buf, port, flags & NI_DGRAM);
+ if (!*p)
+ p = itoa(num, port);
+ if (strlen(p) >= servlen)
return EAI_OVERFLOW;
- strcpy(serv, buf);
+ strcpy(serv, p);
}
return 0;
projects / musl / blobdiff