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473 lines
11 KiB
C
473 lines
11 KiB
C
/*-------------------------------------------------------------------------
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*
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* ip.c
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* IPv6-aware network access.
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/libpq/ip.c,v 1.24 2003/11/29 19:51:49 pgsql Exp $
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*
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* This file and the IPV6 implementation were initially provided by
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* Nigel Kukard <nkukard@lbsd.net>, Linux Based Systems Design
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* http://www.lbsd.net.
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*
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*-------------------------------------------------------------------------
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*/
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/* This is intended to be used in both frontend and backend, so use c.h */
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#include "c.h"
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#if !defined(_MSC_VER) && !defined(__BORLANDC__)
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#ifdef HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#endif
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#include <arpa/inet.h>
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#include <sys/file.h>
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#endif /* !defined(_MSC_VER) && !defined(__BORLANDC__) */
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#include "libpq/ip.h"
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static int rangeSockAddrAF_INET(const struct sockaddr_in * addr,
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const struct sockaddr_in * netaddr,
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const struct sockaddr_in * netmask);
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#ifdef HAVE_IPV6
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static int rangeSockAddrAF_INET6(const struct sockaddr_in6 * addr,
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const struct sockaddr_in6 * netaddr,
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const struct sockaddr_in6 * netmask);
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#endif
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#ifdef HAVE_UNIX_SOCKETS
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static int getaddrinfo_unix(const char *path,
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const struct addrinfo * hintsp,
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struct addrinfo ** result);
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static int getnameinfo_unix(const struct sockaddr_un * sa, int salen,
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char *node, int nodelen,
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char *service, int servicelen,
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int flags);
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#endif
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/*
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* getaddrinfo_all - get address info for Unix, IPv4 and IPv6 sockets
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*/
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int
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getaddrinfo_all(const char *hostname, const char *servname,
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const struct addrinfo * hintp, struct addrinfo ** result)
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{
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#ifdef HAVE_UNIX_SOCKETS
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if (hintp != NULL && hintp->ai_family == AF_UNIX)
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return getaddrinfo_unix(servname, hintp, result);
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#endif
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/* NULL has special meaning to getaddrinfo */
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return getaddrinfo((!hostname || hostname[0] == '\0') ? NULL : hostname,
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servname, hintp, result);
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}
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/*
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* freeaddrinfo_all - free addrinfo structures for IPv4, IPv6, or Unix
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*
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* Note: the ai_family field of the original hint structure must be passed
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* so that we can tell whether the addrinfo struct was built by the system's
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* getaddrinfo() routine or our own getaddrinfo_unix() routine. Some versions
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* of getaddrinfo() might be willing to return AF_UNIX addresses, so it's
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* not safe to look at ai_family in the addrinfo itself.
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*/
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void
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freeaddrinfo_all(int hint_ai_family, struct addrinfo * ai)
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{
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#ifdef HAVE_UNIX_SOCKETS
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if (hint_ai_family == AF_UNIX)
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{
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/* struct was built by getaddrinfo_unix (see getaddrinfo_all) */
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while (ai != NULL)
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{
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struct addrinfo *p = ai;
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ai = ai->ai_next;
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free(p->ai_addr);
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free(p);
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}
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}
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else
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#endif /* HAVE_UNIX_SOCKETS */
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{
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/* struct was built by getaddrinfo() */
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if (ai != NULL)
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freeaddrinfo(ai);
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}
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}
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/*
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* getnameinfo_all - get name info for Unix, IPv4 and IPv6 sockets
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*
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* The API of this routine differs from the standard getnameinfo() definition
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* in two ways: first, the addr parameter is declared as sockaddr_storage
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* rather than struct sockaddr, and second, the node and service fields are
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* guaranteed to be filled with something even on failure return.
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*/
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int
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getnameinfo_all(const struct sockaddr_storage * addr, int salen,
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char *node, int nodelen,
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char *service, int servicelen,
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int flags)
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{
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int rc;
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#ifdef HAVE_UNIX_SOCKETS
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if (addr && addr->ss_family == AF_UNIX)
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rc = getnameinfo_unix((const struct sockaddr_un *) addr, salen,
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node, nodelen,
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service, servicelen,
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flags);
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else
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#endif
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rc = getnameinfo((const struct sockaddr *) addr, salen,
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node, nodelen,
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service, servicelen,
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flags);
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if (rc != 0)
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{
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if (node)
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StrNCpy(node, "???", nodelen);
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if (service)
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StrNCpy(service, "???", servicelen);
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}
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return rc;
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}
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#if defined(HAVE_UNIX_SOCKETS)
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/* -------
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* getaddrinfo_unix - get unix socket info using IPv6-compatible API
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*
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* Bugs: only one addrinfo is set even though hintsp is NULL or
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* ai_socktype is 0
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* AI_CANONNAME is not supported.
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* -------
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*/
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static int
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getaddrinfo_unix(const char *path, const struct addrinfo * hintsp,
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struct addrinfo ** result)
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{
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struct addrinfo hints;
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struct addrinfo *aip;
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struct sockaddr_un *unp;
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*result = NULL;
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MemSet(&hints, 0, sizeof(hints));
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if (strlen(path) >= sizeof(unp->sun_path))
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return EAI_FAIL;
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if (hintsp == NULL)
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{
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hints.ai_family = AF_UNIX;
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hints.ai_socktype = SOCK_STREAM;
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}
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else
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memcpy(&hints, hintsp, sizeof(hints));
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if (hints.ai_socktype == 0)
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hints.ai_socktype = SOCK_STREAM;
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if (hints.ai_family != AF_UNIX)
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{
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/* shouldn't have been called */
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return EAI_FAIL;
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}
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aip = calloc(1, sizeof(struct addrinfo));
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if (aip == NULL)
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return EAI_MEMORY;
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unp = calloc(1, sizeof(struct sockaddr_un));
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if (unp == NULL)
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{
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free(aip);
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return EAI_MEMORY;
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}
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aip->ai_family = AF_UNIX;
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aip->ai_socktype = hints.ai_socktype;
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aip->ai_protocol = hints.ai_protocol;
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aip->ai_next = NULL;
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aip->ai_canonname = NULL;
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*result = aip;
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unp->sun_family = AF_UNIX;
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aip->ai_addr = (struct sockaddr *) unp;
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aip->ai_addrlen = sizeof(struct sockaddr_un);
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strcpy(unp->sun_path, path);
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#ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN
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unp->sun_len = sizeof(struct sockaddr_un);
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#endif
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return 0;
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}
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/*
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* Convert an address to a hostname.
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*/
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static int
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getnameinfo_unix(const struct sockaddr_un * sa, int salen,
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char *node, int nodelen,
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char *service, int servicelen,
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int flags)
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{
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int ret = -1;
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/* Invalid arguments. */
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if (sa == NULL || sa->sun_family != AF_UNIX ||
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(node == NULL && service == NULL))
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return EAI_FAIL;
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/* We don't support those. */
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if ((node && !(flags & NI_NUMERICHOST))
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|| (service && !(flags & NI_NUMERICSERV)))
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return EAI_FAIL;
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if (node)
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{
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ret = snprintf(node, nodelen, "%s", "[local]");
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if (ret == -1 || ret > nodelen)
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return EAI_MEMORY;
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}
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if (service)
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{
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ret = snprintf(service, servicelen, "%s", sa->sun_path);
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if (ret == -1 || ret > servicelen)
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return EAI_MEMORY;
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}
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return 0;
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}
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#endif /* HAVE_UNIX_SOCKETS */
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/*
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* rangeSockAddr - is addr within the subnet specified by netaddr/netmask ?
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*
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* Note: caller must already have verified that all three addresses are
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* in the same address family; and AF_UNIX addresses are not supported.
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*/
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int
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rangeSockAddr(const struct sockaddr_storage * addr,
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const struct sockaddr_storage * netaddr,
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const struct sockaddr_storage * netmask)
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{
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if (addr->ss_family == AF_INET)
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return rangeSockAddrAF_INET((struct sockaddr_in *) addr,
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(struct sockaddr_in *) netaddr,
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(struct sockaddr_in *) netmask);
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#ifdef HAVE_IPV6
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else if (addr->ss_family == AF_INET6)
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return rangeSockAddrAF_INET6((struct sockaddr_in6 *) addr,
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(struct sockaddr_in6 *) netaddr,
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(struct sockaddr_in6 *) netmask);
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#endif
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else
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return 0;
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}
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static int
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rangeSockAddrAF_INET(const struct sockaddr_in * addr,
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const struct sockaddr_in * netaddr,
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const struct sockaddr_in * netmask)
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{
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if (((addr->sin_addr.s_addr ^ netaddr->sin_addr.s_addr) &
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netmask->sin_addr.s_addr) == 0)
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return 1;
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else
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return 0;
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}
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#ifdef HAVE_IPV6
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static int
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rangeSockAddrAF_INET6(const struct sockaddr_in6 * addr,
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const struct sockaddr_in6 * netaddr,
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const struct sockaddr_in6 * netmask)
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{
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int i;
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for (i = 0; i < 16; i++)
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{
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if (((addr->sin6_addr.s6_addr[i] ^ netaddr->sin6_addr.s6_addr[i]) &
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netmask->sin6_addr.s6_addr[i]) != 0)
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return 0;
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}
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return 1;
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}
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#endif
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/*
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* SockAddr_cidr_mask - make a network mask of the appropriate family
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* and required number of significant bits
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*
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* The resulting mask is placed in *mask, which had better be big enough.
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*
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* Return value is 0 if okay, -1 if not.
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*/
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int
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SockAddr_cidr_mask(struct sockaddr_storage * mask, char *numbits, int family)
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{
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long bits;
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char *endptr;
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struct sockaddr_in mask4;
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#ifdef HAVE_IPV6
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struct sockaddr_in6 mask6;
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#endif
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bits = strtol(numbits, &endptr, 10);
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if (*numbits == '\0' || *endptr != '\0')
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return -1;
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if ((bits < 0) || (family == AF_INET && bits > 32)
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#ifdef HAVE_IPV6
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|| (family == AF_INET6 && bits > 128)
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#endif
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)
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return -1;
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switch (family)
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{
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case AF_INET:
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mask4.sin_addr.s_addr =
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htonl((0xffffffffUL << (32 - bits))
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& 0xffffffffUL);
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memcpy(mask, &mask4, sizeof(mask4));
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break;
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#ifdef HAVE_IPV6
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case AF_INET6:
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{
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int i;
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for (i = 0; i < 16; i++)
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{
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if (bits <= 0)
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mask6.sin6_addr.s6_addr[i] = 0;
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else if (bits >= 8)
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mask6.sin6_addr.s6_addr[i] = 0xff;
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else
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{
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mask6.sin6_addr.s6_addr[i] =
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(0xff << (8 - bits)) & 0xff;
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}
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bits -= 8;
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}
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memcpy(mask, &mask6, sizeof(mask6));
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break;
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}
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#endif
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default:
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return -1;
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}
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mask->ss_family = family;
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return 0;
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}
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#ifdef HAVE_IPV6
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/*
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* promote_v4_to_v6_addr --- convert an AF_INET addr to AF_INET6, using
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* the standard convention for IPv4 addresses mapped into IPv6 world
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*
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* The passed addr is modified in place; be sure it is large enough to
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* hold the result! Note that we only worry about setting the fields
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* that rangeSockAddr will look at.
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*/
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void
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promote_v4_to_v6_addr(struct sockaddr_storage * addr)
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{
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struct sockaddr_in addr4;
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struct sockaddr_in6 addr6;
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uint32 ip4addr;
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memcpy(&addr4, addr, sizeof(addr4));
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ip4addr = ntohl(addr4.sin_addr.s_addr);
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memset(&addr6, 0, sizeof(addr6));
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addr6.sin6_family = AF_INET6;
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addr6.sin6_addr.s6_addr[10] = 0xff;
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addr6.sin6_addr.s6_addr[11] = 0xff;
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addr6.sin6_addr.s6_addr[12] = (ip4addr >> 24) & 0xFF;
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addr6.sin6_addr.s6_addr[13] = (ip4addr >> 16) & 0xFF;
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addr6.sin6_addr.s6_addr[14] = (ip4addr >> 8) & 0xFF;
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addr6.sin6_addr.s6_addr[15] = (ip4addr) & 0xFF;
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memcpy(addr, &addr6, sizeof(addr6));
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}
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/*
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* promote_v4_to_v6_mask --- convert an AF_INET netmask to AF_INET6, using
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* the standard convention for IPv4 addresses mapped into IPv6 world
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*
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* This must be different from promote_v4_to_v6_addr because we want to
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* set the high-order bits to 1's not 0's.
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*
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* The passed addr is modified in place; be sure it is large enough to
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* hold the result! Note that we only worry about setting the fields
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* that rangeSockAddr will look at.
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*/
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void
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promote_v4_to_v6_mask(struct sockaddr_storage * addr)
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{
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struct sockaddr_in addr4;
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struct sockaddr_in6 addr6;
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uint32 ip4addr;
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int i;
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memcpy(&addr4, addr, sizeof(addr4));
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ip4addr = ntohl(addr4.sin_addr.s_addr);
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memset(&addr6, 0, sizeof(addr6));
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addr6.sin6_family = AF_INET6;
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for (i = 0; i < 12; i++)
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addr6.sin6_addr.s6_addr[i] = 0xff;
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addr6.sin6_addr.s6_addr[12] = (ip4addr >> 24) & 0xFF;
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addr6.sin6_addr.s6_addr[13] = (ip4addr >> 16) & 0xFF;
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addr6.sin6_addr.s6_addr[14] = (ip4addr >> 8) & 0xFF;
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addr6.sin6_addr.s6_addr[15] = (ip4addr) & 0xFF;
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memcpy(addr, &addr6, sizeof(addr6));
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}
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#endif /* HAVE_IPV6 */
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