network.c
上传用户:blenddy
上传日期:2007-01-07
资源大小:6495k
文件大小:10k
- /*
- * PostgreSQL type definitions for the INET type. This
- * is for IP V4 CIDR notation, but prepared for V6: just
- * add the necessary bits where the comments indicate.
- *
- * $Id: network.c,v 1.10.2.1 1999/08/02 05:24:55 scrappy Exp $
- * Jon Postel RIP 16 Oct 1998
- */
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <errno.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include "postgres.h"
- #include "utils/builtins.h"
- static int v4bitncmp(unsigned int a1, unsigned int a2, int bits);
- /*
- * Access macros. Add IPV6 support.
- */
- #define ip_addrsize(inetptr)
- (((inet_struct *)VARDATA(inetptr))->family == AF_INET ? 4 : -1)
- #define ip_family(inetptr)
- (((inet_struct *)VARDATA(inetptr))->family)
- #define ip_bits(inetptr)
- (((inet_struct *)VARDATA(inetptr))->bits)
- #define ip_type(inetptr)
- (((inet_struct *)VARDATA(inetptr))->type)
- #define ip_v4addr(inetptr)
- (((inet_struct *)VARDATA(inetptr))->addr.ipv4_addr)
- /* Common input routine */
- static inet *
- network_in(char *src, int type)
- {
- int bits;
- inet *dst;
- if (!src)
- return NULL;
- dst = palloc(VARHDRSZ + sizeof(inet_struct));
- if (dst == NULL)
- elog(ERROR, "unable to allocate memory in network_in()");
- /* First, try for an IP V4 address: */
- ip_family(dst) = AF_INET;
- bits = inet_net_pton(ip_family(dst), src, &ip_v4addr(dst),
- type ? ip_addrsize(dst) : -1);
- if ((bits < 0) || (bits > 32))
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "could not parse "%s"", src);
- VARSIZE(dst) = VARHDRSZ
- + ((char *) &ip_v4addr(dst) - (char *) VARDATA(dst))
- + ip_addrsize(dst);
- ip_bits(dst) = bits;
- ip_type(dst) = type;
- return dst;
- }
- /* INET address reader. */
- inet *
- inet_in(char *src)
- {
- return network_in(src, 0);
- }
- /* CIDR address reader. */
- inet *
- cidr_in(char *src)
- {
- return network_in(src, 1);
- }
- /*
- * INET address output function.
- */
- char *
- inet_out(inet *src)
- {
- char *dst,
- tmp[sizeof("255.255.255.255/32")];
- if (ip_family(src) == AF_INET)
- {
- /* It's an IP V4 address: */
- if (ip_type(src))
- dst = inet_cidr_ntop(AF_INET, &ip_v4addr(src), ip_bits(src),
- tmp, sizeof(tmp));
- else
- dst = inet_net_ntop(AF_INET, &ip_v4addr(src), ip_bits(src),
- tmp, sizeof(tmp));
- if (dst == NULL)
- elog(ERROR, "unable to print address (%s)", strerror(errno));
- }
- else
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "unknown address family (%d)", ip_family(src));
- dst = palloc(strlen(tmp) + 1);
- if (dst == NULL)
- elog(ERROR, "unable to allocate memory in inet_out()");
- strcpy(dst, tmp);
- return dst;
- }
- /* just a stub */
- char *
- cidr_out(inet *src)
- {
- return inet_out(src);
- }
- /*
- * Boolean tests for magnitude. Add V4/V6 testing!
- */
- bool
- network_lt(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
- {
- int order = v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2));
- return ((order < 0) || ((order == 0) && (ip_bits(a1) < ip_bits(a2))));
- }
- else
- {
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "cannot compare address families %d and %d",
- ip_family(a1), ip_family(a2));
- return FALSE;
- }
- }
- bool
- network_le(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- return (network_lt(a1, a2) || network_eq(a1, a2));
- }
- bool
- network_eq(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
- {
- return ((ip_bits(a1) == ip_bits(a2))
- && (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a1)) == 0));
- }
- else
- {
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "cannot compare address families %d and %d",
- ip_family(a1), ip_family(a2));
- return FALSE;
- }
- }
- bool
- network_ge(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- return (network_gt(a1, a2) || network_eq(a1, a2));
- }
- bool
- network_gt(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
- {
- int order = v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2));
- return ((order > 0) || ((order == 0) && (ip_bits(a1) > ip_bits(a2))));
- }
- else
- {
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "cannot compare address families %d and %d",
- ip_family(a1), ip_family(a2));
- return FALSE;
- }
- }
- bool
- network_ne(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- return (!network_eq(a1, a2));
- }
- bool
- network_sub(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
- {
- return ((ip_bits(a1) > ip_bits(a2))
- && (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2)) == 0));
- }
- else
- {
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "cannot compare address families %d and %d",
- ip_family(a1), ip_family(a2));
- return FALSE;
- }
- }
- bool
- network_subeq(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
- {
- return ((ip_bits(a1) >= ip_bits(a2))
- && (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2)) == 0));
- }
- else
- {
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "cannot compare address families %d and %d",
- ip_family(a1), ip_family(a2));
- return FALSE;
- }
- }
- bool
- network_sup(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
- {
- return ((ip_bits(a1) < ip_bits(a2))
- && (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a1)) == 0));
- }
- else
- {
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "cannot compare address families %d and %d",
- ip_family(a1), ip_family(a2));
- return FALSE;
- }
- }
- bool
- network_supeq(inet *a1, inet *a2)
- {
- if (!PointerIsValid(a1) || !PointerIsValid(a2))
- return FALSE;
- if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
- {
- return ((ip_bits(a1) <= ip_bits(a2))
- && (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a1)) == 0));
- }
- else
- {
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "cannot compare address families %d and %d",
- ip_family(a1), ip_family(a2));
- return FALSE;
- }
- }
- /*
- * Comparison function for sorting. Add V4/V6 testing!
- */
- int4
- network_cmp(inet *a1, inet *a2)
- {
- if (ntohl(ip_v4addr(a1)) < ntohl(ip_v4addr(a2)))
- return (-1);
- if (ntohl(ip_v4addr(a1)) > ntohl(ip_v4addr(a2)))
- return (1);
- if (ip_bits(a1) < ip_bits(a2))
- return (-1);
- if (ip_bits(a1) > ip_bits(a2))
- return (1);
- return 0;
- }
- text *
- network_host(inet *ip)
- {
- text *ret;
- int len;
- char *ptr,
- tmp[sizeof("255.255.255.255/32")];
- if (!PointerIsValid(ip))
- return NULL;
- if (ip_type(ip))
- elog(ERROR, "CIDR type has no host part");
- if (ip_family(ip) == AF_INET)
- {
- /* It's an IP V4 address: */
- if (inet_net_ntop(AF_INET, &ip_v4addr(ip), 32, tmp, sizeof(tmp)) == NULL)
- elog(ERROR, "unable to print host (%s)", strerror(errno));
- }
- else
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "unknown address family (%d)", ip_family(ip));
- if ((ptr = strchr(tmp, '/')) != NULL)
- *ptr = 0;
- len = VARHDRSZ + strlen(tmp) + 1;
- ret = palloc(len);
- if (ret == NULL)
- elog(ERROR, "unable to allocate memory in network_host()");
- VARSIZE(ret) = len;
- strcpy(VARDATA(ret), tmp);
- return (ret);
- }
- int4
- network_masklen(inet *ip)
- {
- if (!PointerIsValid(ip))
- return 0;
- return ip_bits(ip);
- }
- text *
- network_broadcast(inet *ip)
- {
- text *ret;
- int len;
- char *ptr,
- tmp[sizeof("255.255.255.255/32")];
- if (!PointerIsValid(ip))
- return NULL;
- if (ip_family(ip) == AF_INET)
- {
- /* It's an IP V4 address: */
- int addr;
- unsigned long mask = 0xffffffff;
- if (ip_bits(ip) < 32)
- mask >>= ip_bits(ip);
- addr = htonl(ntohl(ip_v4addr(ip)) | mask);
- if (inet_net_ntop(AF_INET, &addr, 32, tmp, sizeof(tmp)) == NULL)
- elog(ERROR, "unable to print address (%s)", strerror(errno));
- }
- else
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "unknown address family (%d)", ip_family(ip));
- if ((ptr = strchr(tmp, '/')) != NULL)
- *ptr = 0;
- len = VARHDRSZ + strlen(tmp) + 1;
- ret = palloc(len);
- if (ret == NULL)
- elog(ERROR, "unable to allocate memory in network_broadcast()");
- VARSIZE(ret) = len;
- strcpy(VARDATA(ret), tmp);
- return (ret);
- }
- text *
- network_network(inet *ip)
- {
- text *ret;
- int len;
- char tmp[sizeof("255.255.255.255/32")];
- if (!PointerIsValid(ip))
- return NULL;
- if (ip_family(ip) == AF_INET)
- {
- /* It's an IP V4 address: */
- int addr = htonl(ntohl(ip_v4addr(ip)) & (0xffffffff << (32 - ip_bits(ip))));
- if (inet_cidr_ntop(AF_INET, &addr, ip_bits(ip), tmp, sizeof(tmp)) == NULL)
- elog(ERROR, "unable to print network (%s)", strerror(errno));
- }
- else
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "unknown address family (%d)", ip_family(ip));
- len = VARHDRSZ + strlen(tmp) + 1;
- ret = palloc(len);
- if (ret == NULL)
- elog(ERROR, "unable to allocate memory in network_network()");
- VARSIZE(ret) = len;
- strcpy(VARDATA(ret), tmp);
- return (ret);
- }
- text *
- network_netmask(inet *ip)
- {
- text *ret;
- int len;
- char *ptr,
- tmp[sizeof("255.255.255.255/32")];
- if (!PointerIsValid(ip))
- return NULL;
- if (ip_family(ip) == AF_INET)
- {
- /* It's an IP V4 address: */
- int addr = htonl((-1 << (32 - ip_bits(ip))) & 0xffffffff);
- if (inet_net_ntop(AF_INET, &addr, 32, tmp, sizeof(tmp)) == NULL)
- elog(ERROR, "unable to print netmask (%s)", strerror(errno));
- }
- else
- /* Go for an IPV6 address here, before faulting out: */
- elog(ERROR, "unknown address family (%d)", ip_family(ip));
- if ((ptr = strchr(tmp, '/')) != NULL)
- *ptr = 0;
- len = VARHDRSZ + strlen(tmp) + 1;
- ret = palloc(len);
- if (ret == NULL)
- elog(ERROR, "unable to allocate memory in network_netmask()");
- VARSIZE(ret) = len;
- strcpy(VARDATA(ret), tmp);
- return (ret);
- }
- /*
- * Bitwise comparison for V4 addresses. Add V6 implementation!
- */
- static int
- v4bitncmp(unsigned int a1, unsigned int a2, int bits)
- {
- unsigned long mask = 0;
- int i;
- for (i = 0; i < bits; i++)
- mask = (mask >> 1) | 0x80000000;
- a1 = ntohl(a1);
- a2 = ntohl(a2);
- if ((a1 & mask) < (a2 & mask))
- return (-1);
- else if ((a1 & mask) > (a2 & mask))
- return (1);
- return (0);
- }