getnameinfo: Refactor and fix memory leak [BZ #19642]
Split getnameinfo into separate functions for host and service lookups, and for different address families.
This commit is contained in:
Florian Weimer
parent
72c11b353e
commit
2dce81a319
10
ChangeLog
10
ChangeLog
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@ -1,3 +1,13 @@
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2016-04-29 Florian Weimer <fweimer@redhat.com>
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[BZ #19642]
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* inet/getnameinfo.c (gni_host_inet_name, gni_host_inet_numeric)
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(gni_host_inet, gni_host_local, gni_host, gni_serv_inet)
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(gni_serv_local, gni_serv): New functions extracted from
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getnameinfo.
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(getnameinfo): Call gni_host and gni_serv to perform the
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processing. Always free scratch buffer.
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2016-04-29 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
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* sysdeps/powerpc/powerpc64/power8/strncpy.S: Call memset to pad the
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@ -1,3 +1,21 @@
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/* Convert socket address to string using Name Service Switch modules.
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Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* The Inner Net License, Version 2.00
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The author(s) grant permission for redistribution and use in source and
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@ -169,19 +187,323 @@ nrl_domainname (void)
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return domain;
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};
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/* Convert host name, AF_INET/AF_INET6 case, name only. */
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static int
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gni_host_inet_name (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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int herrno;
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struct hostent th;
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struct hostent *h = NULL;
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if (sa->sa_family == AF_INET6)
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{
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while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr),
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sizeof(struct in6_addr),
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AF_INET6, &th,
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tmpbuf->data, tmpbuf->length,
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&h, &herrno))
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if (herrno == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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{
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__set_h_errno (herrno);
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return EAI_MEMORY;
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}
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}
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else
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break;
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}
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else
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{
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while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->sin_addr),
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sizeof(struct in_addr),
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AF_INET, &th,
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tmpbuf->data, tmpbuf->length,
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&h, &herrno))
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if (herrno == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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{
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__set_h_errno (herrno);
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return EAI_MEMORY;
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}
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}
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else
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break;
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}
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if (h == NULL)
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{
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if (herrno == NETDB_INTERNAL)
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{
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__set_h_errno (herrno);
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return EAI_SYSTEM;
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}
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if (herrno == TRY_AGAIN)
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{
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__set_h_errno (herrno);
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return EAI_AGAIN;
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}
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}
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if (h)
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{
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char *c;
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if ((flags & NI_NOFQDN)
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&& (c = nrl_domainname ())
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&& (c = strstr (h->h_name, c))
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&& (c != h->h_name) && (*(--c) == '.'))
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/* Terminate the string after the prefix. */
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*c = '\0';
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#ifdef HAVE_LIBIDN
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/* If requested, convert from the IDN format. */
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if (flags & NI_IDN)
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{
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int idn_flags = 0;
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if (flags & NI_IDN_ALLOW_UNASSIGNED)
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idn_flags |= IDNA_ALLOW_UNASSIGNED;
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if (flags & NI_IDN_USE_STD3_ASCII_RULES)
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idn_flags |= IDNA_USE_STD3_ASCII_RULES;
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char *out;
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int rc = __idna_to_unicode_lzlz (h->h_name, &out,
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idn_flags);
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if (rc != IDNA_SUCCESS)
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{
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if (rc == IDNA_MALLOC_ERROR)
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return EAI_MEMORY;
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if (rc == IDNA_DLOPEN_ERROR)
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return EAI_SYSTEM;
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return EAI_IDN_ENCODE;
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}
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if (out != h->h_name)
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{
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h->h_name = strdupa (out);
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free (out);
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}
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}
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#endif
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size_t len = strlen (h->h_name) + 1;
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if (len > hostlen)
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return EAI_OVERFLOW;
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memcpy (host, h->h_name, len);
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return 0;
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}
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return EAI_NONAME;
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}
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/* Convert host name, AF_INET/AF_INET6 case, numeric conversion. */
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static int
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gni_host_inet_numeric (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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const char *c;
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if (sa->sa_family == AF_INET6)
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{
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const struct sockaddr_in6 *sin6p;
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uint32_t scopeid;
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sin6p = (const struct sockaddr_in6 *) sa;
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c = inet_ntop (AF_INET6,
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(const void *) &sin6p->sin6_addr, host, hostlen);
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scopeid = sin6p->sin6_scope_id;
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if (scopeid != 0)
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{
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/* Buffer is >= IFNAMSIZ+1. */
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char scopebuf[IFNAMSIZ + 1];
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char *scopeptr;
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int ni_numericscope = 0;
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size_t real_hostlen = __strnlen (host, hostlen);
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size_t scopelen = 0;
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scopebuf[0] = SCOPE_DELIMITER;
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scopebuf[1] = '\0';
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scopeptr = &scopebuf[1];
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if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr)
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|| IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr))
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{
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if (if_indextoname (scopeid, scopeptr) == NULL)
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++ni_numericscope;
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else
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scopelen = strlen (scopebuf);
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}
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else
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++ni_numericscope;
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if (ni_numericscope)
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scopelen = 1 + __snprintf (scopeptr,
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(scopebuf
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+ sizeof scopebuf
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- scopeptr),
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"%u", scopeid);
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if (real_hostlen + scopelen + 1 > hostlen)
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/* Signal the buffer is too small. This is
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what inet_ntop does. */
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c = NULL;
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else
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memcpy (host + real_hostlen, scopebuf, scopelen + 1);
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}
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}
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else
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c = inet_ntop (AF_INET,
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(const void *) &(((const struct sockaddr_in *) sa)->sin_addr),
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host, hostlen);
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if (c == NULL)
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return EAI_OVERFLOW;
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return 0;
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}
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static int
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gni_host_inet (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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if (!(flags & NI_NUMERICHOST))
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{
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int result = gni_host_inet_name
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(tmpbuf, sa, addrlen, host, hostlen, flags);
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if (result != EAI_NONAME)
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return result;
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}
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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else
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return gni_host_inet_numeric
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(tmpbuf, sa, addrlen, host, hostlen, flags);
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}
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static int
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gni_host_local (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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if (!(flags & NI_NUMERICHOST))
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{
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struct utsname utsname;
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if (!uname (&utsname))
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{
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strncpy (host, utsname.nodename, hostlen);
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return 0;
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}
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}
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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strncpy (host, "localhost", hostlen);
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return 0;
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}
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static int
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gni_host (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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switch (sa->sa_family)
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{
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case AF_INET:
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case AF_INET6:
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return gni_host_inet (tmpbuf, sa, addrlen, host, hostlen, flags);
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case AF_LOCAL:
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return gni_host_local (tmpbuf, sa, addrlen, host, hostlen, flags);
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default:
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return EAI_FAMILY;
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}
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}
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/* Convert service to string, AF_INET and AF_INET6 variant. */
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static int
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gni_serv_inet (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *serv, socklen_t servlen, int flags)
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{
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_Static_assert
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(offsetof (struct sockaddr_in, sin_port)
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== offsetof (struct sockaddr_in6, sin6_port)
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&& sizeof (((struct sockaddr_in) {}).sin_port) == sizeof (in_port_t)
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&& sizeof (((struct sockaddr_in6) {}).sin6_port) == sizeof (in_port_t),
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"AF_INET and AF_INET6 port consistency");
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if (!(flags & NI_NUMERICSERV))
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{
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struct servent *s, ts;
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int e;
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while ((e = __getservbyport_r (((const struct sockaddr_in *) sa)->sin_port,
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((flags & NI_DGRAM)
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? "udp" : "tcp"), &ts,
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tmpbuf->data, tmpbuf->length, &s)))
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{
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if (e == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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return EAI_MEMORY;
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}
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else
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break;
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}
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if (s)
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{
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strncpy (serv, s->s_name, servlen);
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return 0;
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}
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/* Fall through to numeric conversion. */
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}
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if (__snprintf (serv, servlen, "%d",
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ntohs (((const struct sockaddr_in *) sa)->sin_port))
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+ 1 > servlen)
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return EAI_OVERFLOW;
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return 0;
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}
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/* Convert service to string, AF_LOCAL variant. */
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static int
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gni_serv_local (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *serv, socklen_t servlen, int flags)
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{
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strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);
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return 0;
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}
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/* Convert service to string, dispatching to the implementations
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above. */
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static int
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gni_serv (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *serv, socklen_t servlen, int flags)
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{
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switch (sa->sa_family)
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{
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case AF_INET:
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case AF_INET6:
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return gni_serv_inet (tmpbuf, sa, addrlen, serv, servlen, flags);
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case AF_LOCAL:
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return gni_serv_local (tmpbuf, sa, addrlen, serv, servlen, flags);
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default:
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return EAI_FAMILY;
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}
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}
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int
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getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
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socklen_t hostlen, char *serv, socklen_t servlen,
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int flags)
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{
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int herrno;
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struct hostent th;
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int ok = 0;
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM
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#ifdef HAVE_LIBIDN
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|NI_IDN|NI_IDN_ALLOW_UNASSIGNED|NI_IDN_USE_STD3_ASCII_RULES
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@ -213,249 +535,34 @@ getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
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return EAI_FAMILY;
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}
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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if (host != NULL && hostlen > 0)
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switch (sa->sa_family)
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{
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case AF_INET:
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case AF_INET6:
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if (!(flags & NI_NUMERICHOST))
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{
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struct hostent *h = NULL;
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if (sa->sa_family == AF_INET6)
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{
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while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr),
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sizeof(struct in6_addr),
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AF_INET6, &th,
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tmpbuf.data, tmpbuf.length,
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&h, &herrno))
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if (herrno == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (&tmpbuf))
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{
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__set_h_errno (herrno);
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return EAI_MEMORY;
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}
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}
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else
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break;
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}
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else
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{
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while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->sin_addr),
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sizeof(struct in_addr),
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AF_INET, &th,
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tmpbuf.data, tmpbuf.length,
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&h, &herrno))
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if (herrno == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (&tmpbuf))
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{
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__set_h_errno (herrno);
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return EAI_MEMORY;
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}
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}
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else
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break;
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}
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if (h == NULL)
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{
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if (herrno == NETDB_INTERNAL)
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{
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__set_h_errno (herrno);
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return EAI_SYSTEM;
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}
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if (herrno == TRY_AGAIN)
|
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{
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__set_h_errno (herrno);
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return EAI_AGAIN;
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}
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}
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if (h)
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{
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char *c;
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if ((flags & NI_NOFQDN)
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&& (c = nrl_domainname ())
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&& (c = strstr (h->h_name, c))
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&& (c != h->h_name) && (*(--c) == '.'))
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/* Terminate the string after the prefix. */
|
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*c = '\0';
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|
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#ifdef HAVE_LIBIDN
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/* If requested, convert from the IDN format. */
|
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if (flags & NI_IDN)
|
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{
|
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int idn_flags = 0;
|
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if (flags & NI_IDN_ALLOW_UNASSIGNED)
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idn_flags |= IDNA_ALLOW_UNASSIGNED;
|
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if (flags & NI_IDN_USE_STD3_ASCII_RULES)
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idn_flags |= IDNA_USE_STD3_ASCII_RULES;
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char *out;
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int rc = __idna_to_unicode_lzlz (h->h_name, &out,
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idn_flags);
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if (rc != IDNA_SUCCESS)
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{
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if (rc == IDNA_MALLOC_ERROR)
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return EAI_MEMORY;
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if (rc == IDNA_DLOPEN_ERROR)
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return EAI_SYSTEM;
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return EAI_IDN_ENCODE;
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}
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if (out != h->h_name)
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{
|
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h->h_name = strdupa (out);
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free (out);
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}
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}
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#endif
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size_t len = strlen (h->h_name) + 1;
|
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if (len > hostlen)
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return EAI_OVERFLOW;
|
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|
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memcpy (host, h->h_name, len);
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ok = 1;
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}
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}
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|
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if (!ok)
|
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{
|
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if (flags & NI_NAMEREQD)
|
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return EAI_NONAME;
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||||
else
|
||||
{
|
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const char *c;
|
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if (sa->sa_family == AF_INET6)
|
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{
|
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const struct sockaddr_in6 *sin6p;
|
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uint32_t scopeid;
|
||||
|
||||
sin6p = (const struct sockaddr_in6 *) sa;
|
||||
|
||||
c = inet_ntop (AF_INET6,
|
||||
(const void *) &sin6p->sin6_addr, host, hostlen);
|
||||
scopeid = sin6p->sin6_scope_id;
|
||||
if (scopeid != 0)
|
||||
{
|
||||
/* Buffer is >= IFNAMSIZ+1. */
|
||||
char scopebuf[IFNAMSIZ + 1];
|
||||
char *scopeptr;
|
||||
int ni_numericscope = 0;
|
||||
size_t real_hostlen = __strnlen (host, hostlen);
|
||||
size_t scopelen = 0;
|
||||
|
||||
scopebuf[0] = SCOPE_DELIMITER;
|
||||
scopebuf[1] = '\0';
|
||||
scopeptr = &scopebuf[1];
|
||||
|
||||
if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr)
|
||||
|| IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr))
|
||||
{
|
||||
if (if_indextoname (scopeid, scopeptr) == NULL)
|
||||
++ni_numericscope;
|
||||
else
|
||||
scopelen = strlen (scopebuf);
|
||||
}
|
||||
else
|
||||
++ni_numericscope;
|
||||
|
||||
if (ni_numericscope)
|
||||
scopelen = 1 + __snprintf (scopeptr,
|
||||
(scopebuf
|
||||
+ sizeof scopebuf
|
||||
- scopeptr),
|
||||
"%u", scopeid);
|
||||
|
||||
if (real_hostlen + scopelen + 1 > hostlen)
|
||||
/* Signal the buffer is too small. This is
|
||||
what inet_ntop does. */
|
||||
c = NULL;
|
||||
else
|
||||
memcpy (host + real_hostlen, scopebuf, scopelen + 1);
|
||||
}
|
||||
}
|
||||
else
|
||||
c = inet_ntop (AF_INET,
|
||||
(const void *) &(((const struct sockaddr_in *) sa)->sin_addr),
|
||||
host, hostlen);
|
||||
if (c == NULL)
|
||||
return EAI_OVERFLOW;
|
||||
}
|
||||
ok = 1;
|
||||
}
|
||||
break;
|
||||
|
||||
case AF_LOCAL:
|
||||
if (!(flags & NI_NUMERICHOST))
|
||||
{
|
||||
struct utsname utsname;
|
||||
|
||||
if (!uname (&utsname))
|
||||
{
|
||||
strncpy (host, utsname.nodename, hostlen);
|
||||
break;
|
||||
};
|
||||
};
|
||||
|
||||
if (flags & NI_NAMEREQD)
|
||||
return EAI_NONAME;
|
||||
|
||||
strncpy (host, "localhost", hostlen);
|
||||
break;
|
||||
|
||||
default:
|
||||
return EAI_FAMILY;
|
||||
{
|
||||
int result = gni_host (&tmpbuf, sa, addrlen, host, hostlen, flags);
|
||||
if (result != 0)
|
||||
{
|
||||
scratch_buffer_free (&tmpbuf);
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
if (serv && (servlen > 0))
|
||||
switch (sa->sa_family)
|
||||
{
|
||||
case AF_INET:
|
||||
case AF_INET6:
|
||||
if (!(flags & NI_NUMERICSERV))
|
||||
{
|
||||
struct servent *s, ts;
|
||||
int e;
|
||||
while ((e = __getservbyport_r (((const struct sockaddr_in *) sa)->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)
|
||||
{
|
||||
strncpy (serv, s->s_name, servlen);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (__snprintf (serv, servlen, "%d",
|
||||
ntohs (((const struct sockaddr_in *) sa)->sin_port))
|
||||
+ 1 > servlen)
|
||||
return EAI_OVERFLOW;
|
||||
|
||||
break;
|
||||
|
||||
case AF_LOCAL:
|
||||
strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);
|
||||
break;
|
||||
{
|
||||
int result = gni_serv (&tmpbuf, sa, addrlen, serv, servlen, 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;
|
||||
scratch_buffer_free (&tmpbuf);
|
||||
return 0;
|
||||
}
|
||||
libc_hidden_def (getnameinfo)
|
||||
|
|
|
|||
Loading…
Reference in a new issue