diff options
Diffstat (limited to 'inet/getnameinfo.c')
| -rw-r--r-- | inet/getnameinfo.c | 587 |
1 files changed, 347 insertions, 240 deletions
diff --git a/inet/getnameinfo.c b/inet/getnameinfo.c index 9b1847b025..ce05dda0f8 100644 --- a/inet/getnameinfo.c +++ b/inet/getnameinfo.c @@ -1,3 +1,21 @@ +/* Convert socket address to string using Name Service Switch modules. + Copyright (C) 1997-2016 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 @@ -169,19 +187,323 @@ nrl_domainname (void) return domain; }; +/* 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 herrno; + struct hostent th; + struct hostent *h = NULL; + if (sa->sa_family == AF_INET6) + { + while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr), + sizeof(struct in6_addr), + AF_INET6, &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; + } + else + { + while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->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; + } + + 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 (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 (out != h->h_name) + { + h->h_name = strdupa (out); + free (out); + } + } +#endif + + size_t len = strlen (h->h_name) + 1; + if (len > hostlen) + return EAI_OVERFLOW; + + memcpy (host, h->h_name, len); + + return 0; + } + + 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) +{ + const char *c; + if (sa->sa_family == AF_INET6) + { + const struct sockaddr_in6 *sin6p; + 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; + return 0; +} + +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); +} + +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)) + { + strncpy (host, utsname.nodename, hostlen); + return 0; + } + } + + if (flags & NI_NAMEREQD) + return EAI_NONAME; + + strncpy (host, "localhost", hostlen); + return 0; +} + +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"); + 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); + return 0; + } + /* Fall through to numeric conversion. */ + } + if (__snprintf (serv, servlen, "%d", + ntohs (((const struct sockaddr_in *) sa)->sin_port)) + + 1 > servlen) + return EAI_OVERFLOW; + return 0; +} + +/* 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) +{ + strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen); + return 0; +} + +/* 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) { - int herrno; - struct hostent th; - int ok = 0; - struct scratch_buffer tmpbuf; - - scratch_buffer_init (&tmpbuf); - 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 @@ -213,249 +535,34 @@ getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host, return EAI_FAMILY; } - 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) - { - while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr), - sizeof(struct in6_addr), - AF_INET6, &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; - } - else - { - while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->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; - } - - 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 (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 (out != h->h_name) - { - h->h_name = strdupa (out); - free (out); - } - } -#endif - - size_t len = strlen (h->h_name) + 1; - if (len > hostlen) - return EAI_OVERFLOW; - - memcpy (host, h->h_name, len); - - ok = 1; - } - } - - if (!ok) - { - if (flags & NI_NAMEREQD) - return EAI_NONAME; - else - { - const char *c; - if (sa->sa_family == AF_INET6) - { - const struct sockaddr_in6 *sin6p; - 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; + struct scratch_buffer tmpbuf; + scratch_buffer_init (&tmpbuf); - default: - return EAI_FAMILY; + 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 (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) |