/* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 1996,1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * src/port/inet_net_ntop.c */ #if defined(LIBC_SCCS) && !defined(lint) static const char rcsid[] = "Id: inet_net_ntop.c,v 1.1.2.2 2004/03/09 09:17:27 marka Exp $"; #endif #ifndef FRONTEND #include "postgres.h" #else #include "postgres_fe.h" #endif #include #include #include #ifndef FRONTEND #include "utils/inet.h" #else /* * In a frontend build, we can't include inet.h, but we still need to have * sensible definitions of these two constants. Note that pg_inet_net_ntop() * assumes that PGSQL_AF_INET is equal to AF_INET. */ #define PGSQL_AF_INET (AF_INET + 0) #define PGSQL_AF_INET6 (AF_INET + 1) #endif #define NS_IN6ADDRSZ 16 #define NS_INT16SZ 2 #ifdef SPRINTF_CHAR #define SPRINTF(x) strlen(sprintf/**/x) #else #define SPRINTF(x) ((size_t)sprintf x) #endif static char *inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size); static char *inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size); /* * char * * pg_inet_net_ntop(af, src, bits, dst, size) * convert host/network address from network to presentation format. * "src"'s size is determined from its "af". * return: * pointer to dst, or NULL if an error occurred (check errno). * note: * 192.5.5.1/28 has a nonzero host part, which means it isn't a network * as called for by pg_inet_net_pton() but it can be a host address with * an included netmask. * author: * Paul Vixie (ISC), October 1998 */ char * pg_inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size) { /* * We need to cover both the address family constants used by the PG inet * type (PGSQL_AF_INET and PGSQL_AF_INET6) and those used by the system * libraries (AF_INET and AF_INET6). We can safely assume PGSQL_AF_INET * == AF_INET, but the INET6 constants are very likely to be different. */ switch (af) { case PGSQL_AF_INET: return (inet_net_ntop_ipv4(src, bits, dst, size)); case PGSQL_AF_INET6: #if AF_INET6 != PGSQL_AF_INET6 case AF_INET6: #endif return (inet_net_ntop_ipv6(src, bits, dst, size)); default: errno = EAFNOSUPPORT; return (NULL); } } /* * static char * * inet_net_ntop_ipv4(src, bits, dst, size) * convert IPv4 network address from network to presentation format. * "src"'s size is determined from its "af". * return: * pointer to dst, or NULL if an error occurred (check errno). * note: * network byte order assumed. this means 192.5.5.240/28 has * 0b11110000 in its fourth octet. * author: * Paul Vixie (ISC), October 1998 */ static char * inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size) { char *odst = dst; char *t; int len = 4; int b; if (bits < 0 || bits > 32) { errno = EINVAL; return (NULL); } /* Always format all four octets, regardless of mask length. */ for (b = len; b > 0; b--) { if (size <= sizeof ".255") goto emsgsize; t = dst; if (dst != odst) *dst++ = '.'; dst += SPRINTF((dst, "%u", *src++)); size -= (size_t) (dst - t); } /* don't print masklen if 32 bits */ if (bits != 32) { if (size <= sizeof "/32") goto emsgsize; dst += SPRINTF((dst, "/%u", bits)); } return (odst); emsgsize: errno = EMSGSIZE; return (NULL); } static int decoct(const u_char *src, int bytes, char *dst, size_t size) { char *odst = dst; char *t; int b; for (b = 1; b <= bytes; b++) { if (size <= sizeof "255.") return (0); t = dst; dst += SPRINTF((dst, "%u", *src++)); if (b != bytes) { *dst++ = '.'; *dst = '\0'; } size -= (size_t) (dst - t); } return (dst - odst); } static char * inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) { /* * Note that int32_t and int16_t need only be "at least" large enough to * contain a value of the specified size. On some systems, like Crays, * there is no such thing as an integer variable with 16 bits. Keep this * in mind if you think this function should have been coded to use * pointer overlays. All the world's not a VAX. */ char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"]; char *tp; struct { int base, len; } best, cur; u_int words[NS_IN6ADDRSZ / NS_INT16SZ]; int i; if ((bits < -1) || (bits > 128)) { errno = EINVAL; return (NULL); } /* * Preprocess: Copy the input (bytewise) array into a wordwise array. Find * the longest run of 0x00's in src[] for :: shorthanding. */ memset(words, '\0', sizeof words); for (i = 0; i < NS_IN6ADDRSZ; i++) words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); best.base = -1; cur.base = -1; best.len = 0; cur.len = 0; for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { if (words[i] == 0) { if (cur.base == -1) cur.base = i, cur.len = 1; else cur.len++; } else { if (cur.base != -1) { if (best.base == -1 || cur.len > best.len) best = cur; cur.base = -1; } } } if (cur.base != -1) { if (best.base == -1 || cur.len > best.len) best = cur; } if (best.base != -1 && best.len < 2) best.base = -1; /* * Format the result. */ tp = tmp; for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { /* Are we inside the best run of 0x00's? */ if (best.base != -1 && i >= best.base && i < (best.base + best.len)) { if (i == best.base) *tp++ = ':'; continue; } /* Are we following an initial run of 0x00s or any real hex? */ if (i != 0) *tp++ = ':'; /* Is this address an encapsulated IPv4? */ if (i == 6 && best.base == 0 && (best.len == 6 || (best.len == 7 && words[7] != 0x0001) || (best.len == 5 && words[5] == 0xffff))) { int n; n = decoct(src + 12, 4, tp, sizeof tmp - (tp - tmp)); if (n == 0) { errno = EMSGSIZE; return (NULL); } tp += strlen(tp); break; } tp += SPRINTF((tp, "%x", words[i])); } /* Was it a trailing run of 0x00's? */ if (best.base != -1 && (best.base + best.len) == (NS_IN6ADDRSZ / NS_INT16SZ)) *tp++ = ':'; *tp = '\0'; if (bits != -1 && bits != 128) tp += SPRINTF((tp, "/%u", bits)); /* * Check for overflow, copy, and we're done. */ if ((size_t) (tp - tmp) > size) { errno = EMSGSIZE; return (NULL); } strcpy(dst, tmp); return (dst); }