--- /dev/null
+
+/* Copyright 2005 by Dominick Meglio
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+#include "ares_setup.h"
+
+#ifdef HAVE_GETSERVBYPORT_R
+# if !defined(GETSERVBYPORT_R_ARGS) || \
+ (GETSERVBYPORT_R_ARGS < 4) || (GETSERVBYPORT_R_ARGS > 6)
+# error "you MUST specifiy a valid number of arguments for getservbyport_r"
+# endif
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+# include <netdb.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+# include <arpa/inet.h>
+#endif
+#ifdef HAVE_ARPA_NAMESER_H
+# include <arpa/nameser.h>
+#else
+# include "nameser.h"
+#endif
+#ifdef HAVE_ARPA_NAMESER_COMPAT_H
+# include <arpa/nameser_compat.h>
+#endif
+
+#ifdef HAVE_NET_IF_H
+#include <net/if.h>
+#endif
+
+#include "ares.h"
+#include "ares_ipv6.h"
+#include "ares_nowarn.h"
+#include "ares_private.h"
+
+struct nameinfo_query {
+ ares_nameinfo_callback callback;
+ void *arg;
+ union {
+ struct sockaddr_in addr4;
+ struct sockaddr_in6 addr6;
+ } addr;
+ int family;
+ int flags;
+ int timeouts;
+};
+
+#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
+#define IPBUFSIZ \
+ (sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") + IF_NAMESIZE)
+#else
+#define IPBUFSIZ \
+ (sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"))
+#endif
+
+static void nameinfo_callback(void *arg, int status, int timeouts,
+ struct hostent *host);
+static char *lookup_service(unsigned short port, int flags,
+ char *buf, size_t buflen);
+#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
+static void append_scopeid(struct sockaddr_in6 *addr6, unsigned int scopeid,
+ char *buf, size_t buflen);
+#endif
+STATIC_TESTABLE char *ares_striendstr(const char *s1, const char *s2);
+
+void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
+ ares_socklen_t salen,
+ int flags, ares_nameinfo_callback callback, void *arg)
+{
+ struct sockaddr_in *addr = NULL;
+ struct sockaddr_in6 *addr6 = NULL;
+ struct nameinfo_query *niquery;
+ unsigned int port = 0;
+
+ /* Validate socket address family and length */
+ if ((sa->sa_family == AF_INET) &&
+ (salen == sizeof(struct sockaddr_in)))
+ {
+ addr = (struct sockaddr_in *)sa;
+ port = addr->sin_port;
+ }
+ else if ((sa->sa_family == AF_INET6) &&
+ (salen == sizeof(struct sockaddr_in6)))
+ {
+ addr6 = (struct sockaddr_in6 *)sa;
+ port = addr6->sin6_port;
+ }
+ else
+ {
+ callback(arg, ARES_ENOTIMP, 0, NULL, NULL);
+ return;
+ }
+
+ /* If neither, assume they want a host */
+ if (!(flags & ARES_NI_LOOKUPSERVICE) && !(flags & ARES_NI_LOOKUPHOST))
+ flags |= ARES_NI_LOOKUPHOST;
+
+ /* All they want is a service, no need for DNS */
+ if ((flags & ARES_NI_LOOKUPSERVICE) && !(flags & ARES_NI_LOOKUPHOST))
+ {
+ char buf[33], *service;
+
+ service = lookup_service((unsigned short)(port & 0xffff),
+ flags, buf, sizeof(buf));
+ callback(arg, ARES_SUCCESS, 0, NULL, service);
+ return;
+ }
+
+ /* They want a host lookup */
+ if ((flags & ARES_NI_LOOKUPHOST))
+ {
+ /* A numeric host can be handled without DNS */
+ if ((flags & ARES_NI_NUMERICHOST))
+ {
+ char ipbuf[IPBUFSIZ];
+ char srvbuf[33];
+ char *service = NULL;
+ ipbuf[0] = 0;
+
+ /* Specifying not to lookup a host, but then saying a host
+ * is required has to be illegal.
+ */
+ if (flags & ARES_NI_NAMEREQD)
+ {
+ callback(arg, ARES_EBADFLAGS, 0, NULL, NULL);
+ return;
+ }
+ if (salen == sizeof(struct sockaddr_in6))
+ {
+ ares_inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, IPBUFSIZ);
+ /* If the system supports scope IDs, use it */
+#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
+ append_scopeid(addr6, flags, ipbuf, sizeof(ipbuf));
+#endif
+ }
+ else
+ {
+ ares_inet_ntop(AF_INET, &addr->sin_addr, ipbuf, IPBUFSIZ);
+ }
+ /* They also want a service */
+ if (flags & ARES_NI_LOOKUPSERVICE)
+ service = lookup_service((unsigned short)(port & 0xffff),
+ flags, srvbuf, sizeof(srvbuf));
+ callback(arg, ARES_SUCCESS, 0, ipbuf, service);
+ return;
+ }
+ /* This is where a DNS lookup becomes necessary */
+ else
+ {
+ niquery = ares_malloc(sizeof(struct nameinfo_query));
+ if (!niquery)
+ {
+ callback(arg, ARES_ENOMEM, 0, NULL, NULL);
+ return;
+ }
+ niquery->callback = callback;
+ niquery->arg = arg;
+ niquery->flags = flags;
+ niquery->timeouts = 0;
+ if (sa->sa_family == AF_INET)
+ {
+ niquery->family = AF_INET;
+ memcpy(&niquery->addr.addr4, addr, sizeof(niquery->addr.addr4));
+ ares_gethostbyaddr(channel, &addr->sin_addr,
+ sizeof(struct in_addr), AF_INET,
+ nameinfo_callback, niquery);
+ }
+ else
+ {
+ niquery->family = AF_INET6;
+ memcpy(&niquery->addr.addr6, addr6, sizeof(niquery->addr.addr6));
+ ares_gethostbyaddr(channel, &addr6->sin6_addr,
+ sizeof(struct ares_in6_addr), AF_INET6,
+ nameinfo_callback, niquery);
+ }
+ }
+ }
+}
+
+static void nameinfo_callback(void *arg, int status, int timeouts,
+ struct hostent *host)
+{
+ struct nameinfo_query *niquery = (struct nameinfo_query *) arg;
+ char srvbuf[33];
+ char *service = NULL;
+
+ niquery->timeouts += timeouts;
+ if (status == ARES_SUCCESS)
+ {
+ /* They want a service too */
+ if (niquery->flags & ARES_NI_LOOKUPSERVICE)
+ {
+ if (niquery->family == AF_INET)
+ service = lookup_service(niquery->addr.addr4.sin_port,
+ niquery->flags, srvbuf, sizeof(srvbuf));
+ else
+ service = lookup_service(niquery->addr.addr6.sin6_port,
+ niquery->flags, srvbuf, sizeof(srvbuf));
+ }
+ /* NOFQDN means we have to strip off the domain name portion. We do
+ this by determining our own domain name, then searching the string
+ for this domain name and removing it.
+ */
+#ifdef HAVE_GETHOSTNAME
+ if (niquery->flags & ARES_NI_NOFQDN)
+ {
+ char buf[255];
+ char *domain;
+ gethostname(buf, 255);
+ if ((domain = strchr(buf, '.')) != NULL)
+ {
+ char *end = ares_striendstr(host->h_name, domain);
+ if (end)
+ *end = 0;
+ }
+ }
+#endif
+ niquery->callback(niquery->arg, ARES_SUCCESS, niquery->timeouts,
+ (char *)(host->h_name),
+ service);
+ ares_free(niquery);
+ return;
+ }
+ /* We couldn't find the host, but it's OK, we can use the IP */
+ else if (status == ARES_ENOTFOUND && !(niquery->flags & ARES_NI_NAMEREQD))
+ {
+ char ipbuf[IPBUFSIZ];
+ if (niquery->family == AF_INET)
+ ares_inet_ntop(AF_INET, &niquery->addr.addr4.sin_addr, ipbuf,
+ IPBUFSIZ);
+ else
+ {
+ ares_inet_ntop(AF_INET6, &niquery->addr.addr6.sin6_addr, ipbuf,
+ IPBUFSIZ);
+#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
+ append_scopeid(&niquery->addr.addr6, niquery->flags, ipbuf,
+ sizeof(ipbuf));
+#endif
+ }
+ /* They want a service too */
+ if (niquery->flags & ARES_NI_LOOKUPSERVICE)
+ {
+ if (niquery->family == AF_INET)
+ service = lookup_service(niquery->addr.addr4.sin_port,
+ niquery->flags, srvbuf, sizeof(srvbuf));
+ else
+ service = lookup_service(niquery->addr.addr6.sin6_port,
+ niquery->flags, srvbuf, sizeof(srvbuf));
+ }
+ niquery->callback(niquery->arg, ARES_SUCCESS, niquery->timeouts, ipbuf,
+ service);
+ ares_free(niquery);
+ return;
+ }
+ niquery->callback(niquery->arg, status, niquery->timeouts, NULL, NULL);
+ ares_free(niquery);
+}
+
+static char *lookup_service(unsigned short port, int flags,
+ char *buf, size_t buflen)
+{
+ const char *proto;
+ struct servent *sep;
+#ifdef HAVE_GETSERVBYPORT_R
+ struct servent se;
+#endif
+ char tmpbuf[4096];
+ char *name;
+ size_t name_len;
+
+ if (port)
+ {
+ if (flags & ARES_NI_NUMERICSERV)
+ sep = NULL;
+ else
+ {
+ if (flags & ARES_NI_UDP)
+ proto = "udp";
+ else if (flags & ARES_NI_SCTP)
+ proto = "sctp";
+ else if (flags & ARES_NI_DCCP)
+ proto = "dccp";
+ else
+ proto = "tcp";
+#ifdef HAVE_GETSERVBYPORT_R
+ memset(&se, 0, sizeof(se));
+ sep = &se;
+ memset(tmpbuf, 0, sizeof(tmpbuf));
+#if GETSERVBYPORT_R_ARGS == 6
+ if (getservbyport_r(port, proto, &se, (void *)tmpbuf,
+ sizeof(tmpbuf), &sep) != 0)
+ sep = NULL; /* LCOV_EXCL_LINE: buffer large so this never fails */
+#elif GETSERVBYPORT_R_ARGS == 5
+ sep = getservbyport_r(port, proto, &se, (void *)tmpbuf,
+ sizeof(tmpbuf));
+#elif GETSERVBYPORT_R_ARGS == 4
+ if (getservbyport_r(port, proto, &se, (void *)tmpbuf) != 0)
+ sep = NULL;
+#else
+ /* Lets just hope the OS uses TLS! */
+ sep = getservbyport(port, proto);
+#endif
+#else
+ /* Lets just hope the OS uses TLS! */
+#if (defined(NETWARE) && !defined(__NOVELL_LIBC__))
+ sep = getservbyport(port, (char*)proto);
+#else
+ sep = getservbyport(port, proto);
+#endif
+#endif
+ }
+ if (sep && sep->s_name)
+ {
+ /* get service name */
+ name = sep->s_name;
+ }
+ else
+ {
+ /* get port as a string */
+ sprintf(tmpbuf, "%u", (unsigned int)ntohs(port));
+ name = tmpbuf;
+ }
+ name_len = strlen(name);
+ if (name_len < buflen)
+ /* return it if buffer big enough */
+ memcpy(buf, name, name_len + 1);
+ else
+ /* avoid reusing previous one */
+ buf[0] = '\0'; /* LCOV_EXCL_LINE: no real service names are too big */
+ return buf;
+ }
+ buf[0] = '\0';
+ return NULL;
+}
+
+#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
+static void append_scopeid(struct sockaddr_in6 *addr6, unsigned int flags,
+ char *buf, size_t buflen)
+{
+#ifdef HAVE_IF_INDEXTONAME
+ int is_ll, is_mcll;
+#endif
+ char tmpbuf[IF_NAMESIZE + 2];
+ size_t bufl;
+ int is_scope_long = sizeof(addr6->sin6_scope_id) > sizeof(unsigned int);
+
+ tmpbuf[0] = '%';
+
+#ifdef HAVE_IF_INDEXTONAME
+ is_ll = IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr);
+ is_mcll = IN6_IS_ADDR_MC_LINKLOCAL(&addr6->sin6_addr);
+ if ((flags & ARES_NI_NUMERICSCOPE) ||
+ (!is_ll && !is_mcll))
+ {
+ if (is_scope_long)
+ {
+ sprintf(&tmpbuf[1], "%lu", (unsigned long)addr6->sin6_scope_id);
+ }
+ else
+ {
+ sprintf(&tmpbuf[1], "%u", (unsigned int)addr6->sin6_scope_id);
+ }
+ }
+ else
+ {
+ if (if_indextoname(addr6->sin6_scope_id, &tmpbuf[1]) == NULL)
+ {
+ if (is_scope_long)
+ {
+ sprintf(&tmpbuf[1], "%lu", (unsigned long)addr6->sin6_scope_id);
+ }
+ else
+ {
+ sprintf(&tmpbuf[1], "%u", (unsigned int)addr6->sin6_scope_id);
+ }
+ }
+ }
+#else
+ if (is_scope_long)
+ {
+ sprintf(&tmpbuf[1], "%lu", (unsigned long)addr6->sin6_scope_id);
+ }
+ else
+ {
+ sprintf(&tmpbuf[1], "%u", (unsigned int)addr6->sin6_scope_id);
+ }
+ (void) flags;
+#endif
+ tmpbuf[IF_NAMESIZE + 1] = '\0';
+ bufl = strlen(buf);
+
+ if(bufl + strlen(tmpbuf) < buflen)
+ /* only append the scopeid string if it fits in the target buffer */
+ strcpy(&buf[bufl], tmpbuf);
+}
+#endif
+
+/* Determines if s1 ends with the string in s2 (case-insensitive) */
+STATIC_TESTABLE char *ares_striendstr(const char *s1, const char *s2)
+{
+ const char *c1, *c2, *c1_begin;
+ int lo1, lo2;
+ size_t s1_len = strlen(s1), s2_len = strlen(s2);
+
+ /* If the substr is longer than the full str, it can't match */
+ if (s2_len > s1_len)
+ return NULL;
+
+ /* Jump to the end of s1 minus the length of s2 */
+ c1_begin = s1+s1_len-s2_len;
+ c1 = (const char *)c1_begin;
+ c2 = s2;
+ while (c2 < s2+s2_len)
+ {
+ lo1 = TOLOWER(*c1);
+ lo2 = TOLOWER(*c2);
+ if (lo1 != lo2)
+ return NULL;
+ else
+ {
+ c1++;
+ c2++;
+ }
+ }
+ return (char *)c1_begin;
+}
+
+int ares__is_onion_domain(const char *name)
+{
+ if (ares_striendstr(name, ".onion"))
+ return 1;
+
+ if (ares_striendstr(name, ".onion."))
+ return 1;
+
+ return 0;
+}
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