diff options
Diffstat (limited to 'src/backend/libpq/ifaddr.c')
| -rw-r--r-- | src/backend/libpq/ifaddr.c | 594 |
1 files changed, 594 insertions, 0 deletions
diff --git a/src/backend/libpq/ifaddr.c b/src/backend/libpq/ifaddr.c new file mode 100644 index 0000000..75760f3 --- /dev/null +++ b/src/backend/libpq/ifaddr.c @@ -0,0 +1,594 @@ +/*------------------------------------------------------------------------- + * + * ifaddr.c + * IP netmask calculations, and enumerating network interfaces. + * + * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * src/backend/libpq/ifaddr.c + * + * This file and the IPV6 implementation were initially provided by + * Nigel Kukard <nkukard@lbsd.net>, Linux Based Systems Design + * http://www.lbsd.net. + * + *------------------------------------------------------------------------- + */ + +#include "postgres.h" + +#include <unistd.h> +#include <sys/stat.h> +#include <sys/socket.h> +#include <netdb.h> +#include <netinet/in.h> +#ifdef HAVE_NETINET_TCP_H +#include <netinet/tcp.h> +#endif +#include <sys/file.h> + +#include "libpq/ifaddr.h" +#include "port/pg_bswap.h" + +static int range_sockaddr_AF_INET(const struct sockaddr_in *addr, + const struct sockaddr_in *netaddr, + const struct sockaddr_in *netmask); + +#ifdef HAVE_IPV6 +static int range_sockaddr_AF_INET6(const struct sockaddr_in6 *addr, + const struct sockaddr_in6 *netaddr, + const struct sockaddr_in6 *netmask); +#endif + + +/* + * pg_range_sockaddr - is addr within the subnet specified by netaddr/netmask ? + * + * Note: caller must already have verified that all three addresses are + * in the same address family; and AF_UNIX addresses are not supported. + */ +int +pg_range_sockaddr(const struct sockaddr_storage *addr, + const struct sockaddr_storage *netaddr, + const struct sockaddr_storage *netmask) +{ + if (addr->ss_family == AF_INET) + return range_sockaddr_AF_INET((const struct sockaddr_in *) addr, + (const struct sockaddr_in *) netaddr, + (const struct sockaddr_in *) netmask); +#ifdef HAVE_IPV6 + else if (addr->ss_family == AF_INET6) + return range_sockaddr_AF_INET6((const struct sockaddr_in6 *) addr, + (const struct sockaddr_in6 *) netaddr, + (const struct sockaddr_in6 *) netmask); +#endif + else + return 0; +} + +static int +range_sockaddr_AF_INET(const struct sockaddr_in *addr, + const struct sockaddr_in *netaddr, + const struct sockaddr_in *netmask) +{ + if (((addr->sin_addr.s_addr ^ netaddr->sin_addr.s_addr) & + netmask->sin_addr.s_addr) == 0) + return 1; + else + return 0; +} + + +#ifdef HAVE_IPV6 + +static int +range_sockaddr_AF_INET6(const struct sockaddr_in6 *addr, + const struct sockaddr_in6 *netaddr, + const struct sockaddr_in6 *netmask) +{ + int i; + + for (i = 0; i < 16; i++) + { + if (((addr->sin6_addr.s6_addr[i] ^ netaddr->sin6_addr.s6_addr[i]) & + netmask->sin6_addr.s6_addr[i]) != 0) + return 0; + } + + return 1; +} +#endif /* HAVE_IPV6 */ + +/* + * pg_sockaddr_cidr_mask - make a network mask of the appropriate family + * and required number of significant bits + * + * numbits can be null, in which case the mask is fully set. + * + * The resulting mask is placed in *mask, which had better be big enough. + * + * Return value is 0 if okay, -1 if not. + */ +int +pg_sockaddr_cidr_mask(struct sockaddr_storage *mask, char *numbits, int family) +{ + long bits; + char *endptr; + + if (numbits == NULL) + { + bits = (family == AF_INET) ? 32 : 128; + } + else + { + bits = strtol(numbits, &endptr, 10); + if (*numbits == '\0' || *endptr != '\0') + return -1; + } + + switch (family) + { + case AF_INET: + { + struct sockaddr_in mask4; + long maskl; + + if (bits < 0 || bits > 32) + return -1; + memset(&mask4, 0, sizeof(mask4)); + /* avoid "x << 32", which is not portable */ + if (bits > 0) + maskl = (0xffffffffUL << (32 - (int) bits)) + & 0xffffffffUL; + else + maskl = 0; + mask4.sin_addr.s_addr = pg_hton32(maskl); + memcpy(mask, &mask4, sizeof(mask4)); + break; + } + +#ifdef HAVE_IPV6 + case AF_INET6: + { + struct sockaddr_in6 mask6; + int i; + + if (bits < 0 || bits > 128) + return -1; + memset(&mask6, 0, sizeof(mask6)); + for (i = 0; i < 16; i++) + { + if (bits <= 0) + mask6.sin6_addr.s6_addr[i] = 0; + else if (bits >= 8) + mask6.sin6_addr.s6_addr[i] = 0xff; + else + { + mask6.sin6_addr.s6_addr[i] = + (0xff << (8 - (int) bits)) & 0xff; + } + bits -= 8; + } + memcpy(mask, &mask6, sizeof(mask6)); + break; + } +#endif + default: + return -1; + } + + mask->ss_family = family; + return 0; +} + + +/* + * Run the callback function for the addr/mask, after making sure the + * mask is sane for the addr. + */ +static void +run_ifaddr_callback(PgIfAddrCallback callback, void *cb_data, + struct sockaddr *addr, struct sockaddr *mask) +{ + struct sockaddr_storage fullmask; + + if (!addr) + return; + + /* Check that the mask is valid */ + if (mask) + { + if (mask->sa_family != addr->sa_family) + { + mask = NULL; + } + else if (mask->sa_family == AF_INET) + { + if (((struct sockaddr_in *) mask)->sin_addr.s_addr == INADDR_ANY) + mask = NULL; + } +#ifdef HAVE_IPV6 + else if (mask->sa_family == AF_INET6) + { + if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) mask)->sin6_addr)) + mask = NULL; + } +#endif + } + + /* If mask is invalid, generate our own fully-set mask */ + if (!mask) + { + pg_sockaddr_cidr_mask(&fullmask, NULL, addr->sa_family); + mask = (struct sockaddr *) &fullmask; + } + + (*callback) (addr, mask, cb_data); +} + +#ifdef WIN32 + +#include <winsock2.h> +#include <ws2tcpip.h> + +/* + * Enumerate the system's network interface addresses and call the callback + * for each one. Returns 0 if successful, -1 if trouble. + * + * This version is for Win32. Uses the Winsock 2 functions (ie: ws2_32.dll) + */ +int +pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data) +{ + INTERFACE_INFO *ptr, + *ii = NULL; + unsigned long length, + i; + unsigned long n_ii = 0; + SOCKET sock; + int error; + + sock = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0); + if (sock == INVALID_SOCKET) + return -1; + + while (n_ii < 1024) + { + n_ii += 64; + ptr = realloc(ii, sizeof(INTERFACE_INFO) * n_ii); + if (!ptr) + { + free(ii); + closesocket(sock); + errno = ENOMEM; + return -1; + } + + ii = ptr; + if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, 0, 0, + ii, n_ii * sizeof(INTERFACE_INFO), + &length, 0, 0) == SOCKET_ERROR) + { + error = WSAGetLastError(); + if (error == WSAEFAULT || error == WSAENOBUFS) + continue; /* need to make the buffer bigger */ + closesocket(sock); + free(ii); + return -1; + } + + break; + } + + for (i = 0; i < length / sizeof(INTERFACE_INFO); ++i) + run_ifaddr_callback(callback, cb_data, + (struct sockaddr *) &ii[i].iiAddress, + (struct sockaddr *) &ii[i].iiNetmask); + + closesocket(sock); + free(ii); + return 0; +} +#elif HAVE_GETIFADDRS /* && !WIN32 */ + +#ifdef HAVE_IFADDRS_H +#include <ifaddrs.h> +#endif + +/* + * Enumerate the system's network interface addresses and call the callback + * for each one. Returns 0 if successful, -1 if trouble. + * + * This version uses the getifaddrs() interface, which is available on + * BSDs, AIX, and modern Linux. + */ +int +pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data) +{ + struct ifaddrs *ifa, + *l; + + if (getifaddrs(&ifa) < 0) + return -1; + + for (l = ifa; l; l = l->ifa_next) + run_ifaddr_callback(callback, cb_data, + l->ifa_addr, l->ifa_netmask); + + freeifaddrs(ifa); + return 0; +} +#else /* !HAVE_GETIFADDRS && !WIN32 */ + +#include <sys/ioctl.h> + +#ifdef HAVE_NET_IF_H +#include <net/if.h> +#endif + +#ifdef HAVE_SYS_SOCKIO_H +#include <sys/sockio.h> +#endif + +/* + * SIOCGIFCONF does not return IPv6 addresses on Solaris + * and HP/UX. So we prefer SIOCGLIFCONF if it's available. + * + * On HP/UX, however, it *only* returns IPv6 addresses, + * and the structs are named slightly differently too. + * We'd have to do another call with SIOCGIFCONF to get the + * IPv4 addresses as well. We don't currently bother, just + * fall back to SIOCGIFCONF on HP/UX. + */ + +#if defined(SIOCGLIFCONF) && !defined(__hpux) + +/* + * Enumerate the system's network interface addresses and call the callback + * for each one. Returns 0 if successful, -1 if trouble. + * + * This version uses ioctl(SIOCGLIFCONF). + */ +int +pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data) +{ + struct lifconf lifc; + struct lifreq *lifr, + lmask; + struct sockaddr *addr, + *mask; + char *ptr, + *buffer = NULL; + size_t n_buffer = 1024; + pgsocket sock, + fd; + +#ifdef HAVE_IPV6 + pgsocket sock6; +#endif + int i, + total; + + sock = socket(AF_INET, SOCK_DGRAM, 0); + if (sock == PGINVALID_SOCKET) + return -1; + + while (n_buffer < 1024 * 100) + { + n_buffer += 1024; + ptr = realloc(buffer, n_buffer); + if (!ptr) + { + free(buffer); + close(sock); + errno = ENOMEM; + return -1; + } + + memset(&lifc, 0, sizeof(lifc)); + lifc.lifc_family = AF_UNSPEC; + lifc.lifc_buf = buffer = ptr; + lifc.lifc_len = n_buffer; + + if (ioctl(sock, SIOCGLIFCONF, &lifc) < 0) + { + if (errno == EINVAL) + continue; + free(buffer); + close(sock); + return -1; + } + + /* + * Some Unixes try to return as much data as possible, with no + * indication of whether enough space allocated. Don't believe we have + * it all unless there's lots of slop. + */ + if (lifc.lifc_len < n_buffer - 1024) + break; + } + +#ifdef HAVE_IPV6 + /* We'll need an IPv6 socket too for the SIOCGLIFNETMASK ioctls */ + sock6 = socket(AF_INET6, SOCK_DGRAM, 0); + if (sock6 == PGINVALID_SOCKET) + { + free(buffer); + close(sock); + return -1; + } +#endif + + total = lifc.lifc_len / sizeof(struct lifreq); + lifr = lifc.lifc_req; + for (i = 0; i < total; ++i) + { + addr = (struct sockaddr *) &lifr[i].lifr_addr; + memcpy(&lmask, &lifr[i], sizeof(struct lifreq)); +#ifdef HAVE_IPV6 + fd = (addr->sa_family == AF_INET6) ? sock6 : sock; +#else + fd = sock; +#endif + if (ioctl(fd, SIOCGLIFNETMASK, &lmask) < 0) + mask = NULL; + else + mask = (struct sockaddr *) &lmask.lifr_addr; + run_ifaddr_callback(callback, cb_data, addr, mask); + } + + free(buffer); + close(sock); +#ifdef HAVE_IPV6 + close(sock6); +#endif + return 0; +} +#elif defined(SIOCGIFCONF) + +/* + * Remaining Unixes use SIOCGIFCONF. Some only return IPv4 information + * here, so this is the least preferred method. Note that there is no + * standard way to iterate the struct ifreq returned in the array. + * On some OSs the structures are padded large enough for any address, + * on others you have to calculate the size of the struct ifreq. + */ + +/* Some OSs have _SIZEOF_ADDR_IFREQ, so just use that */ +#ifndef _SIZEOF_ADDR_IFREQ + +/* Calculate based on sockaddr.sa_len */ +#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN +#define _SIZEOF_ADDR_IFREQ(ifr) \ + ((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \ + (sizeof(struct ifreq) - sizeof(struct sockaddr) + \ + (ifr).ifr_addr.sa_len) : sizeof(struct ifreq)) + +/* Padded ifreq structure, simple */ +#else +#define _SIZEOF_ADDR_IFREQ(ifr) \ + sizeof (struct ifreq) +#endif +#endif /* !_SIZEOF_ADDR_IFREQ */ + +/* + * Enumerate the system's network interface addresses and call the callback + * for each one. Returns 0 if successful, -1 if trouble. + * + * This version uses ioctl(SIOCGIFCONF). + */ +int +pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data) +{ + struct ifconf ifc; + struct ifreq *ifr, + *end, + addr, + mask; + char *ptr, + *buffer = NULL; + size_t n_buffer = 1024; + pgsocket sock; + + sock = socket(AF_INET, SOCK_DGRAM, 0); + if (sock == PGINVALID_SOCKET) + return -1; + + while (n_buffer < 1024 * 100) + { + n_buffer += 1024; + ptr = realloc(buffer, n_buffer); + if (!ptr) + { + free(buffer); + close(sock); + errno = ENOMEM; + return -1; + } + + memset(&ifc, 0, sizeof(ifc)); + ifc.ifc_buf = buffer = ptr; + ifc.ifc_len = n_buffer; + + if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) + { + if (errno == EINVAL) + continue; + free(buffer); + close(sock); + return -1; + } + + /* + * Some Unixes try to return as much data as possible, with no + * indication of whether enough space allocated. Don't believe we have + * it all unless there's lots of slop. + */ + if (ifc.ifc_len < n_buffer - 1024) + break; + } + + end = (struct ifreq *) (buffer + ifc.ifc_len); + for (ifr = ifc.ifc_req; ifr < end;) + { + memcpy(&addr, ifr, sizeof(addr)); + memcpy(&mask, ifr, sizeof(mask)); + if (ioctl(sock, SIOCGIFADDR, &addr, sizeof(addr)) == 0 && + ioctl(sock, SIOCGIFNETMASK, &mask, sizeof(mask)) == 0) + run_ifaddr_callback(callback, cb_data, + &addr.ifr_addr, &mask.ifr_addr); + ifr = (struct ifreq *) ((char *) ifr + _SIZEOF_ADDR_IFREQ(*ifr)); + } + + free(buffer); + close(sock); + return 0; +} +#else /* !defined(SIOCGIFCONF) */ + +/* + * Enumerate the system's network interface addresses and call the callback + * for each one. Returns 0 if successful, -1 if trouble. + * + * This version is our fallback if there's no known way to get the + * interface addresses. Just return the standard loopback addresses. + */ +int +pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data) +{ + struct sockaddr_in addr; + struct sockaddr_storage mask; + +#ifdef HAVE_IPV6 + struct sockaddr_in6 addr6; +#endif + + /* addr 127.0.0.1/8 */ + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = pg_ntoh32(0x7f000001); + memset(&mask, 0, sizeof(mask)); + pg_sockaddr_cidr_mask(&mask, "8", AF_INET); + run_ifaddr_callback(callback, cb_data, + (struct sockaddr *) &addr, + (struct sockaddr *) &mask); + +#ifdef HAVE_IPV6 + /* addr ::1/128 */ + memset(&addr6, 0, sizeof(addr6)); + addr6.sin6_family = AF_INET6; + addr6.sin6_addr.s6_addr[15] = 1; + memset(&mask, 0, sizeof(mask)); + pg_sockaddr_cidr_mask(&mask, "128", AF_INET6); + run_ifaddr_callback(callback, cb_data, + (struct sockaddr *) &addr6, + (struct sockaddr *) &mask); +#endif + + return 0; +} +#endif /* !defined(SIOCGIFCONF) */ + +#endif /* !HAVE_GETIFADDRS */ |