+/* Convert socket address to string using Name Service Switch modules.
+ Copyright (C) 1997-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
/* The Inner Net License, Version 2.00
The author(s) grant permission for redistribution and use in source and
3. Redistributions in binary form must reproduce the authors' copyright
notice(s), this list of conditions, and the following disclaimer in the
documentation and/or other materials provided with the distribution.
-4. All advertising materials mentioning features or use of this software
- must display the following acknowledgement with the name(s) of the
- authors as specified in the copyright notice(s) substituted where
- indicated:
-
- This product includes software developed by <name(s)>, The Inner
- Net, and other contributors.
-
+4. [The copyright holder has authorized the removal of this clause.]
5. Neither the name(s) of the author(s) nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */
-#include <sys/types.h>
-#include <sys/socket.h>
-
-#include <netinet/in.h>
-#include <sys/un.h>
-#include <sys/utsname.h>
-#include <netdb.h>
#include <errno.h>
-#include <string.h>
+#include <netdb.h>
+#include <stddef.h>
+#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
#include <unistd.h>
-#include <alloca.h>
-#include <bits/libc-lock.h>
+#include <stdint.h>
#include <arpa/inet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <sys/utsname.h>
+#include <libc-lock.h>
+#include <scratch_buffer.h>
+
+#ifdef HAVE_LIBIDN
+# include <idna.h>
+#endif
#ifndef min
# define min(x,y) (((x) > (y)) ? (y) : (x))
#endif /* min */
+libc_freeres_ptr (static char *domain);
+
static char *
-internal_function
nrl_domainname (void)
{
- static char *domain;
static int not_first;
if (! not_first)
{
char *c;
struct hostent *h, th;
- size_t tmpbuflen = 1024;
- char *tmpbuf = alloca (tmpbuflen);
int herror;
+ struct scratch_buffer tmpbuf;
+ scratch_buffer_init (&tmpbuf);
not_first = 1;
- while (__gethostbyname_r ("localhost", &th, tmpbuf, tmpbuflen, &h,
- &herror))
+ while (__gethostbyname_r ("localhost", &th,
+ tmpbuf.data, tmpbuf.length,
+ &h, &herror))
{
if (herror == NETDB_INTERNAL && errno == ERANGE)
{
- tmpbuflen *= 2;
- tmpbuf = alloca (tmpbuflen);
+ if (!scratch_buffer_grow (&tmpbuf))
+ goto done;
}
else
break;
{
/* The name contains no domain information. Use the name
now to get more information. */
- while (__gethostname (tmpbuf, tmpbuflen))
- {
- tmpbuflen *= 2;
- tmpbuf = alloca (tmpbuflen);
- }
+ while (__gethostname (tmpbuf.data, tmpbuf.length))
+ if (!scratch_buffer_grow (&tmpbuf))
+ goto done;
- if ((c = strchr (tmpbuf, '.')))
+ if ((c = strchr (tmpbuf.data, '.')))
domain = __strdup (++c);
else
{
/* We need to preserve the hostname. */
- const char *hstname = strdupa (tmpbuf);
+ const char *hstname = strdupa (tmpbuf.data);
- while (__gethostbyname_r (hstname, &th, tmpbuf, tmpbuflen,
+ while (__gethostbyname_r (hstname, &th,
+ tmpbuf.data, tmpbuf.length,
&h, &herror))
{
if (herror == NETDB_INTERNAL && errno == ERANGE)
{
- tmpbuflen *= 2;
- tmpbuf = alloca (tmpbuflen);
+ if (!scratch_buffer_grow (&tmpbuf))
+ goto done;
}
else
break;
{
struct in_addr in_addr;
- in_addr.s_addr = htonl (0x7f000001);
+ in_addr.s_addr = htonl (INADDR_LOOPBACK);
while (__gethostbyaddr_r ((const char *) &in_addr,
sizeof (struct in_addr),
- AF_INET, &th, tmpbuf,
- tmpbuflen, &h, &herror))
+ AF_INET, &th,
+ tmpbuf.data, tmpbuf.length,
+ &h, &herror))
{
if (herror == NETDB_INTERNAL && errno == ERANGE)
{
- tmpbuflen *= 2;
- tmpbuf = alloca (tmpbuflen);
+ if (!scratch_buffer_grow (&tmpbuf))
+ goto done;
}
else
break;
}
}
}
+ done:
+ scratch_buffer_free (&tmpbuf);
}
__libc_lock_unlock (lock);
return domain;
};
+/* Copy a string to a destination buffer with length checking. Return
+ EAI_OVERFLOW if the buffer is not large enough, and 0 on
+ success. */
+static int
+checked_copy (char *dest, size_t destlen, const char *source)
+{
+ size_t source_length = strlen (source);
+ if (source_length + 1 > destlen)
+ return EAI_OVERFLOW;
+ memcpy (dest, source, source_length + 1);
+ return 0;
+}
-int
-getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
- size_t hostlen, char *serv, size_t servlen, int flags)
+/* Helper function for CHECKED_SNPRINTF below. */
+static int
+check_sprintf_result (int result, size_t destlen)
+{
+ if (result < 0)
+ return EAI_SYSTEM;
+ if ((size_t) result >= destlen)
+ /* If ret == destlen, there was no room for the terminating NUL
+ character. */
+ return EAI_OVERFLOW;
+ return 0;
+}
+
+/* Format a string in the destination buffer. Return 0 on success,
+ EAI_OVERFLOW in case the buffer is too small, or EAI_SYSTEM on any
+ other error. */
+#define CHECKED_SNPRINTF(dest, destlen, format, ...) \
+ check_sprintf_result \
+ (__snprintf (dest, destlen, format, __VA_ARGS__), destlen)
+
+/* Convert host name, AF_INET/AF_INET6 case, name only. */
+static int
+gni_host_inet_name (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *host, socklen_t hostlen, int flags)
{
- int serrno = errno;
- int tmpbuflen = 1024;
int herrno;
- char *tmpbuf = alloca (tmpbuflen);
struct hostent th;
-
- if (sa == NULL)
- return -1;
-
- if (host != NULL && hostlen > 0)
- switch(sa->sa_family)
- {
- case AF_INET:
- case AF_INET6:
- if (!(flags & NI_NUMERICHOST))
+ struct hostent *h = NULL;
+ if (sa->sa_family == AF_INET6)
+ {
+ const struct sockaddr_in6 *sin6p = (const struct sockaddr_in6 *) sa;
+ while (__gethostbyaddr_r (&sin6p->sin6_addr, sizeof(struct in6_addr),
+ AF_INET6, &th, tmpbuf->data, tmpbuf->length,
+ &h, &herrno))
+ if (herrno == NETDB_INTERNAL && errno == ERANGE)
{
- struct hostent *h = NULL;
- if (h == NULL)
+ if (!scratch_buffer_grow (tmpbuf))
{
- if (sa->sa_family == AF_INET6)
- {
- while (__gethostbyaddr_r ((void *) &(((struct sockaddr_in6 *) sa)->sin6_addr),
- sizeof(struct in6_addr),
- AF_INET6, &th, tmpbuf, tmpbuflen,
- &h, &herrno))
- {
- if (herrno == NETDB_INTERNAL)
- {
- if (errno == ERANGE)
- {
- tmpbuflen *= 2;
- tmpbuf = alloca (tmpbuflen);
- }
- else
- {
- __set_h_errno (herrno);
- __set_errno (serrno);
- return -1;
- }
- }
- else
- {
- break;
- }
- }
- }
- else
- {
- while (__gethostbyaddr_r ((void *) &(((struct sockaddr_in *)sa)->sin_addr),
- sizeof(struct in_addr), AF_INET,
- &th, tmpbuf, tmpbuflen,
- &h, &herrno))
- {
- if (errno == ERANGE)
- {
- tmpbuflen *= 2;
- tmpbuf = alloca (tmpbuflen);
- }
- else
- {
- break;
- }
- }
- }
- }
-
- if (h)
- {
- if (flags & NI_NOFQDN)
- {
- char *c;
- if ((c = nrl_domainname ()) && (c = strstr(h->h_name, c))
- && (c != h->h_name) && (*(--c) == '.'))
- {
- strncpy (host, h->h_name,
- min(hostlen, (size_t) (c - h->h_name)));
- host[min(hostlen - 1, (size_t) (c - h->h_name))]
- = '\0';
- break;
- }
- }
- strncpy (host, h->h_name, hostlen);
- break;
+ __set_h_errno (herrno);
+ return EAI_MEMORY;
}
}
-
- if (flags & NI_NAMEREQD)
- {
- __set_errno (serrno);
- return -1;
- }
else
- {
- const char *c;
- if (sa->sa_family == AF_INET6)
- c = inet_ntop (AF_INET6,
- (void *) &(((struct sockaddr_in6 *) sa)->sin6_addr),
- host, hostlen);
- else
- c = inet_ntop (AF_INET,
- (void *) &(((struct sockaddr_in *) sa)->sin_addr),
- host, hostlen);
-
- if (c == NULL)
- {
- __set_errno (serrno);
- return -1;
- }
- }
- break;
+ break;
+ }
+ else
+ {
+ const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
+ while (__gethostbyaddr_r (&sinp->sin_addr, sizeof(struct in_addr),
+ AF_INET, &th, tmpbuf->data, tmpbuf->length,
+ &h, &herrno))
+ if (herrno == NETDB_INTERNAL && errno == ERANGE)
+ {
+ if (!scratch_buffer_grow (tmpbuf))
+ {
+ __set_h_errno (herrno);
+ return EAI_MEMORY;
+ }
+ }
+ else
+ break;
+ }
- case AF_LOCAL:
- if (!(flags & NI_NUMERICHOST))
- {
- struct utsname utsname;
+ if (h == NULL)
+ {
+ if (herrno == NETDB_INTERNAL)
+ {
+ __set_h_errno (herrno);
+ return EAI_SYSTEM;
+ }
+ if (herrno == TRY_AGAIN)
+ {
+ __set_h_errno (herrno);
+ return EAI_AGAIN;
+ }
+ }
- if (!uname (&utsname))
- {
- strncpy (host, utsname.nodename, hostlen);
- break;
- };
- };
+ if (h)
+ {
+ char *c;
+ if ((flags & NI_NOFQDN)
+ && (c = nrl_domainname ())
+ && (c = strstr (h->h_name, c))
+ && (c != h->h_name) && (*(--c) == '.'))
+ /* Terminate the string after the prefix. */
+ *c = '\0';
+
+#ifdef HAVE_LIBIDN
+ /* If requested, convert from the IDN format. */
+ if (flags & NI_IDN)
+ {
+ int idn_flags = 0;
+ if (flags & NI_IDN_ALLOW_UNASSIGNED)
+ idn_flags |= IDNA_ALLOW_UNASSIGNED;
+ if (flags & NI_IDN_USE_STD3_ASCII_RULES)
+ idn_flags |= IDNA_USE_STD3_ASCII_RULES;
+
+ char *out;
+ int rc = __idna_to_unicode_lzlz (h->h_name, &out,
+ idn_flags);
+ if (rc != IDNA_SUCCESS)
+ {
+ if (rc == IDNA_MALLOC_ERROR)
+ return EAI_MEMORY;
+ if (rc == IDNA_DLOPEN_ERROR)
+ return EAI_SYSTEM;
+ return EAI_IDN_ENCODE;
+ }
- if (flags & NI_NAMEREQD)
- {
- __set_errno (serrno);
- return -1;
- }
+ if (out != h->h_name)
+ {
+ h->h_name = strdupa (out);
+ free (out);
+ }
+ }
+#endif
- strncpy (host, "localhost", hostlen);
- break;
+ size_t len = strlen (h->h_name) + 1;
+ if (len > hostlen)
+ return EAI_OVERFLOW;
- default:
- return -1;
+ memcpy (host, h->h_name, len);
+
+ return 0;
}
- if (serv && (servlen > 0))
- switch(sa->sa_family)
- {
- case AF_INET:
- case AF_INET6:
- if (!(flags & NI_NUMERICSERV))
- {
- struct servent *s, ts;
- while (__getservbyport_r (((struct sockaddr_in *) sa)->sin_port,
- ((flags & NI_DGRAM) ? "udp" : "tcp"),
- &ts, tmpbuf, tmpbuflen, &s))
- {
- if (herrno == NETDB_INTERNAL)
- {
- if (errno == ERANGE)
- {
- tmpbuflen *= 2;
- tmpbuf = __alloca (tmpbuflen);
- }
- else
- {
- __set_errno (serrno);
- return -1;
- }
- }
- else
- {
- break;
- }
- }
- if (s)
- {
- strncpy (serv, s->s_name, servlen);
- break;
- }
- }
- __snprintf (serv, servlen, "%d",
- ntohs (((struct sockaddr_in *) sa)->sin_port));
- break;
+ return EAI_NONAME;
+}
+
+/* Convert host name, AF_INET/AF_INET6 case, numeric conversion. */
+static int
+gni_host_inet_numeric (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *host, socklen_t hostlen, int flags)
+{
+ if (sa->sa_family == AF_INET6)
+ {
+ const struct sockaddr_in6 *sin6p = (const struct sockaddr_in6 *) sa;
+ if (inet_ntop (AF_INET6, &sin6p->sin6_addr, host, hostlen) == NULL)
+ return EAI_OVERFLOW;
+
+ uint32_t scopeid = sin6p->sin6_scope_id;
+ if (scopeid != 0)
+ {
+ size_t used_hostlen = __strnlen (host, hostlen);
+ /* Location of the scope string in the host buffer. */
+ char *scope_start = host + used_hostlen;
+ size_t scope_length = hostlen - used_hostlen;
+
+ if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr)
+ || IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr))
+ {
+ char scopebuf[IFNAMSIZ];
+ if (if_indextoname (scopeid, scopebuf) != NULL)
+ return CHECKED_SNPRINTF
+ (scope_start, scope_length,
+ "%c%s", SCOPE_DELIMITER, scopebuf);
+ }
+ return CHECKED_SNPRINTF
+ (scope_start, scope_length, "%c%u", SCOPE_DELIMITER, scopeid);
+ }
+ }
+ else
+ {
+ const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
+ if (inet_ntop (AF_INET, &sinp->sin_addr, host, hostlen) == NULL)
+ return EAI_OVERFLOW;
+ }
+ return 0;
+}
+
+/* Convert AF_INET or AF_INET6 socket address, host part. */
+static int
+gni_host_inet (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *host, socklen_t hostlen, int flags)
+{
+ if (!(flags & NI_NUMERICHOST))
+ {
+ int result = gni_host_inet_name
+ (tmpbuf, sa, addrlen, host, hostlen, flags);
+ if (result != EAI_NONAME)
+ return result;
+ }
+
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+ else
+ return gni_host_inet_numeric
+ (tmpbuf, sa, addrlen, host, hostlen, flags);
+}
+
+/* Convert AF_LOCAL socket address, host part. */
+static int
+gni_host_local (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *host, socklen_t hostlen, int flags)
+{
+ if (!(flags & NI_NUMERICHOST))
+ {
+ struct utsname utsname;
+ if (uname (&utsname) == 0)
+ return checked_copy (host, hostlen, utsname.nodename);
+ }
+
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+
+ return checked_copy (host, hostlen, "localhost");
+}
- case AF_LOCAL:
- strncpy (serv, ((struct sockaddr_un *) sa)->sun_path, servlen);
- break;
+/* Convert the host part of an AF_LOCAK socket address. */
+static int
+gni_host (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *host, socklen_t hostlen, int flags)
+{
+ switch (sa->sa_family)
+ {
+ case AF_INET:
+ case AF_INET6:
+ return gni_host_inet (tmpbuf, sa, addrlen, host, hostlen, flags);
+
+ case AF_LOCAL:
+ return gni_host_local (tmpbuf, sa, addrlen, host, hostlen, flags);
+
+ default:
+ return EAI_FAMILY;
+ }
+}
+
+/* Convert service to string, AF_INET and AF_INET6 variant. */
+static int
+gni_serv_inet (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *serv, socklen_t servlen, int flags)
+{
+ _Static_assert
+ (offsetof (struct sockaddr_in, sin_port)
+ == offsetof (struct sockaddr_in6, sin6_port)
+ && sizeof (((struct sockaddr_in) {}).sin_port) == sizeof (in_port_t)
+ && sizeof (((struct sockaddr_in6) {}).sin6_port) == sizeof (in_port_t),
+ "AF_INET and AF_INET6 port consistency");
+ const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
+ if (!(flags & NI_NUMERICSERV))
+ {
+ struct servent *s, ts;
+ int e;
+ while ((e = __getservbyport_r (sinp->sin_port,
+ ((flags & NI_DGRAM)
+ ? "udp" : "tcp"), &ts,
+ tmpbuf->data, tmpbuf->length, &s)))
+ {
+ if (e == ERANGE)
+ {
+ if (!scratch_buffer_grow (tmpbuf))
+ return EAI_MEMORY;
+ }
+ else
+ break;
+ }
+ if (s)
+ return checked_copy (serv, servlen, s->s_name);
+ /* Fall through to numeric conversion. */
+ }
+ return CHECKED_SNPRINTF (serv, servlen, "%d", ntohs (sinp->sin_port));
+}
+
+/* Convert service to string, AF_LOCAL variant. */
+static int
+gni_serv_local (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *serv, socklen_t servlen, int flags)
+{
+ return checked_copy
+ (serv, servlen, ((const struct sockaddr_un *) sa)->sun_path);
+}
+
+/* Convert service to string, dispatching to the implementations
+ above. */
+static int
+gni_serv (struct scratch_buffer *tmpbuf,
+ const struct sockaddr *sa, socklen_t addrlen,
+ char *serv, socklen_t servlen, int flags)
+{
+ switch (sa->sa_family)
+ {
+ case AF_INET:
+ case AF_INET6:
+ return gni_serv_inet (tmpbuf, sa, addrlen, serv, servlen, flags);
+ case AF_LOCAL:
+ return gni_serv_local (tmpbuf, sa, addrlen, serv, servlen, flags);
+ default:
+ return EAI_FAMILY;
+ }
+}
+
+int
+getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
+ socklen_t hostlen, char *serv, socklen_t servlen,
+ int flags)
+{
+ if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM
+#ifdef HAVE_LIBIDN
+ |NI_IDN|NI_IDN_ALLOW_UNASSIGNED|NI_IDN_USE_STD3_ASCII_RULES
+#endif
+ ))
+ return EAI_BADFLAGS;
+
+ if (sa == NULL || addrlen < sizeof (sa_family_t))
+ return EAI_FAMILY;
+
+ if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL)
+ return EAI_NONAME;
+
+ switch (sa->sa_family)
+ {
+ case AF_LOCAL:
+ if (addrlen < (socklen_t) offsetof (struct sockaddr_un, sun_path))
+ return EAI_FAMILY;
+ break;
+ case AF_INET:
+ if (addrlen < sizeof (struct sockaddr_in))
+ return EAI_FAMILY;
+ break;
+ case AF_INET6:
+ if (addrlen < sizeof (struct sockaddr_in6))
+ return EAI_FAMILY;
+ break;
+ default:
+ return EAI_FAMILY;
+ }
+
+ struct scratch_buffer tmpbuf;
+ scratch_buffer_init (&tmpbuf);
+
+ if (host != NULL && hostlen > 0)
+ {
+ int result = gni_host (&tmpbuf, sa, addrlen, host, hostlen, flags);
+ if (result != 0)
+ {
+ scratch_buffer_free (&tmpbuf);
+ return result;
+ }
}
- if (host && (hostlen > 0))
- host[hostlen-1] = 0;
if (serv && (servlen > 0))
- serv[servlen-1] = 0;
- errno = serrno;
+ {
+ int result = gni_serv (&tmpbuf, sa, addrlen, serv, servlen, flags);
+ if (result != 0)
+ {
+ scratch_buffer_free (&tmpbuf);
+ return result;
+ }
+ }
+
+ scratch_buffer_free (&tmpbuf);
return 0;
}
+libc_hidden_def (getnameinfo)
projects / thirdparty / glibc.git / blobdiff