diff options
Diffstat (limited to 'common/socket.c')
| -rw-r--r-- | common/socket.c | 309 |
1 files changed, 308 insertions, 1 deletions
diff --git a/common/socket.c b/common/socket.c index 47c0903..bcccbae 100644 --- a/common/socket.c +++ b/common/socket.c @@ -34,7 +34,16 @@ #include <winsock2.h> #include <ws2tcpip.h> #include <windows.h> +#ifndef HAVE_GETIFADDRS +#include <iphlpapi.h> +#endif static int wsa_init = 0; +#ifndef IFF_RUNNING +#define IFF_RUNNING IFF_UP +#endif +#ifndef AI_NUMERICSERV +#define AI_NUMERICSERV 0 +#endif #else #include <sys/socket.h> #include <sys/un.h> @@ -377,10 +386,308 @@ static uint32_t _in6_addr_scope(struct in6_addr* addr) return scope; } +#ifndef HAVE_GETIFADDRS +#ifdef WIN32 + +struct ifaddrs { + struct ifaddrs *ifa_next; /* Next item in list */ + char *ifa_name; /* Name of interface */ + unsigned int ifa_flags; /* Flags from SIOCGIFFLAGS */ + struct sockaddr *ifa_addr; /* Address of interface */ + struct sockaddr *ifa_netmask; /* Netmask of interface */ + union { + struct sockaddr *ifu_broadaddr; /* Broadcast address of interface */ + struct sockaddr *ifu_dstaddr; /* Point-to-point destination address */ + } ifa_ifu; +#define ifa_broadaddr ifa_ifu.ifu_broadaddr +#define ifa_dstaddr ifa_ifu.ifu_dstaddr + void *ifa_data; /* Address-specific data */ +}; + +#define WORKING_BUFFER_SIZE 15000 +#define MAX_TRIES 3 + +static void freeifaddrs(struct ifaddrs *ifa) +{ + if (!ifa) { + return; + } + free(ifa->ifa_name); + free(ifa->ifa_addr); + free(ifa->ifa_netmask); + free(ifa->ifa_dstaddr); + freeifaddrs(ifa->ifa_next); + free(ifa); +} + +/* + * getifaddrs() reference implementation for win32. + * Heavily based on openpgm's implementation found here: + * https://github.com/steve-o/openpgm/blob/master/openpgm/pgm/getifaddrs.c + */ +static int getifaddrs(struct ifaddrs** ifap) +{ + struct ifaddrs* ifa = NULL; + + DWORD dwRetVal = 0; + + PIP_ADAPTER_ADDRESSES pAddresses = NULL; + ULONG outBufLen = 0; + ULONG Iterations = 0; + + ULONG flags = GAA_FLAG_INCLUDE_PREFIX | + GAA_FLAG_SKIP_ANYCAST | + GAA_FLAG_SKIP_DNS_SERVER | + GAA_FLAG_SKIP_FRIENDLY_NAME | + GAA_FLAG_SKIP_MULTICAST; + + PIP_ADAPTER_ADDRESSES adapter = NULL; + + if (!ifap) { + errno = EINVAL; + return -1; + } + *ifap = NULL; + + outBufLen = WORKING_BUFFER_SIZE; + do { + pAddresses = (IP_ADAPTER_ADDRESSES*)malloc(outBufLen); + if (pAddresses == NULL) { + printf("Memory allocation failed for IP_ADAPTER_ADDRESSES struct\n"); + return -1; + } + dwRetVal = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, pAddresses, &outBufLen); + if (dwRetVal == ERROR_BUFFER_OVERFLOW) { + free(pAddresses); + pAddresses = NULL; + } else { + break; + } + Iterations++; + } while ((dwRetVal == ERROR_BUFFER_OVERFLOW) && (Iterations < MAX_TRIES)); + + if (dwRetVal != NO_ERROR) { + free(pAddresses); + return -1; + } + + for (adapter = pAddresses; adapter; adapter = adapter->Next) { + int unicastIndex = 0; + for (IP_ADAPTER_UNICAST_ADDRESS *unicast = adapter->FirstUnicastAddress; unicast; unicast = unicast->Next, ++unicastIndex) { + /* ensure IP adapter */ + if (AF_INET != unicast->Address.lpSockaddr->sa_family && AF_INET6 != unicast->Address.lpSockaddr->sa_family) { + continue; + } + + if (!ifa) { + ifa = malloc(sizeof(struct ifaddrs)); + if (!ifa) { + errno = ENOMEM; + free(pAddresses); + return -1; + } + *ifap = ifa; + ifa->ifa_next = NULL; + } else { + struct ifaddrs* ifanew = malloc(sizeof(struct ifaddrs)); + if (!ifanew) { + freeifaddrs(*ifap); + free(pAddresses); + errno = ENOMEM; + return -1; + } + ifa->ifa_next = ifanew; + ifa = ifanew; + ifa->ifa_next = NULL; + } + + /* name */ + ifa->ifa_name = strdup(adapter->AdapterName); + + /* flags */ + ifa->ifa_flags = 0; + if (IfOperStatusUp == adapter->OperStatus) + ifa->ifa_flags |= IFF_UP; + if (IF_TYPE_SOFTWARE_LOOPBACK == adapter->IfType) + ifa->ifa_flags |= IFF_LOOPBACK; + if (!(adapter->Flags & IP_ADAPTER_NO_MULTICAST)) + ifa->ifa_flags |= IFF_MULTICAST; + + /* address */ + ifa->ifa_addr = (struct sockaddr*)malloc(sizeof(struct sockaddr_storage)); + memcpy(ifa->ifa_addr, unicast->Address.lpSockaddr, unicast->Address.iSockaddrLength); + + /* netmask */ + ifa->ifa_netmask = (struct sockaddr*)malloc(sizeof(struct sockaddr_storage)); + memset(ifa->ifa_netmask, 0, sizeof(struct sockaddr_storage)); + +/* pre-Vista must hunt for matching prefix in linked list, otherwise use + * OnLinkPrefixLength from IP_ADAPTER_UNICAST_ADDRESS structure. + * FirstPrefix requires Windows XP SP1, from SP1 to pre-Vista provides a + * single adapter prefix for each IP address. Vista and later provides + * host IP address prefix, subnet IP address, and subnet broadcast IP + * address. In addition there is a multicast and broadcast address prefix. + */ + ULONG prefixLength = 0; + +#if defined( _WIN32 ) && ( _WIN32_WINNT >= 0x0600 ) +/* For a unicast IPv4 address, any value greater than 32 is an illegal + * value. For a unicast IPv6 address, any value greater than 128 is an + * illegal value. A value of 255 is commonly used to represent an illegal + * value. + * + * Windows 7 SP1 returns 64 for Teredo links which is incorrect. + */ + +#define IN6_IS_ADDR_TEREDO(addr) \ + (((const uint32_t *)(addr))[0] == ntohl (0x20010000)) + + if (AF_INET6 == unicast->Address.lpSockaddr->sa_family && +/* TunnelType only applies to one interface on the adapter and no + * convenient method is provided to determine which. + */ + TUNNEL_TYPE_TEREDO == adapter->TunnelType && +/* Test the interface with the known Teredo network prefix. + */ + IN6_IS_ADDR_TEREDO( &((struct sockaddr_in6*)(unicast->Address.lpSockaddr))->sin6_addr) && +/* Test that this version is actually wrong, subsequent releases from Microsoft + * may resolve the issue. + */ + 32 != unicast->OnLinkPrefixLength) + { + prefixLength = 32; + } + else + prefixLength = unicast->OnLinkPrefixLength; +#else +/* The order of linked IP_ADAPTER_UNICAST_ADDRESS structures pointed to by + * the FirstUnicastAddress member does not have any relationship with the + * order of linked IP_ADAPTER_PREFIX structures pointed to by the FirstPrefix + * member. + * + * Example enumeration: + * [ no subnet ] + * ::1/128 - address + * ff00::%1/8 - multicast (no IPv6 broadcast) + * 127.0.0.0/8 - subnet + * 127.0.0.1/32 - address + * 127.255.255.255/32 - subnet broadcast + * 224.0.0.0/4 - multicast + * 255.255.255.255/32 - broadcast + * + * Which differs from most adapters listing three IPv6: + * fe80::%10/64 - subnet + * fe80::51e9:5fe5:4202:325a%10/128 - address + * ff00::%10/8 - multicast + * + * !IfOperStatusUp IPv4 addresses are skipped: + * fe80::%13/64 - subnet + * fe80::d530:946d:e8df:8c91%13/128 - address + * ff00::%13/8 - multicast + * [ no subnet ] + * [ no address ] + * 224.0.0.0/4 - multicast + * 255.255.255.255/32 - broadcast + * + * On PTP links no multicast or broadcast addresses are returned: + * [ no subnet ] + * fe80::5efe:10.203.9.30/128 - address + * [ no multicast ] + * [ no multicast ] + * [ no broadcast ] + * + * Active primary IPv6 interfaces are a bit overloaded: + * ::/0 - default route + * 2001::/32 - global subnet + * 2001:0:4137:9e76:2443:d6:ba87:1a2a/128 - global address + * fe80::/64 - link-local subnet + * fe80::2443:d6:ba87:1a2a/128 - link-local address + * ff00::/8 - multicast + */ + +#define IN_LINKLOCAL(a) ((((uint32_t) (a)) & 0xaffff0000) == 0xa9fe0000) + + for (IP_ADAPTER_PREFIX *prefix = adapter->FirstPrefix; prefix; prefix = prefix->Next) { + LPSOCKADDR lpSockaddr = prefix->Address.lpSockaddr; + if (lpSockaddr->sa_family != unicast->Address.lpSockaddr->sa_family) + continue; +/* special cases */ +/* RFC2863: IPv4 interface not up */ + if (AF_INET == lpSockaddr->sa_family && adapter->OperStatus != IfOperStatusUp) { +/* RFC3927: link-local IPv4 always has 16-bit CIDR */ + if (IN_LINKLOCAL( ntohl (((struct sockaddr_in*)(unicast->Address.lpSockaddr))->sin_addr.s_addr))) { + prefixLength = 16; + } + break; + } +/* default IPv6 route */ + if (AF_INET6 == lpSockaddr->sa_family && 0 == prefix->PrefixLength && IN6_IS_ADDR_UNSPECIFIED( &((struct sockaddr_in6*)(lpSockaddr))->sin6_addr)) { + continue; + } +/* Assume unicast address for first prefix of operational adapter */ + if (AF_INET == lpSockaddr->sa_family) + if (IN_MULTICAST( ntohl (((struct sockaddr_in*)(lpSockaddr))->sin_addr.s_addr))) { + fprintf(stderr, "FATAL: first prefix is non a unicast address\n"); + break; + } + if (AF_INET6 == lpSockaddr->sa_family) + if (IN6_IS_ADDR_MULTICAST( &((struct sockaddr_in6*)(lpSockaddr))->sin6_addr)) { + fprintf(stderr, "FATAL: first prefix is not a unicast address\n"); + break; + } +/* Assume subnet or host IP address for XP backward compatibility */ + + prefixLength = prefix->PrefixLength; + break; + } +#endif /* defined( _WIN32 ) && ( _WIN32_WINNT >= 0x0600 ) */ + +/* map prefix to netmask */ + ifa->ifa_netmask->sa_family = unicast->Address.lpSockaddr->sa_family; + switch (unicast->Address.lpSockaddr->sa_family) { + case AF_INET: + if (0 == prefixLength || prefixLength > 32) { + prefixLength = 32; + } +#if defined( _WIN32) && ( _WIN32_WINNT >= 0x0600 ) +/* Added in Vista, but no IPv6 equivalent. */ + { + ULONG Mask; + ConvertLengthToIpv4Mask (prefixLength, &Mask); + ((struct sockaddr_in*)ifa->ifa_netmask)->sin_addr.s_addr = Mask; /* network order */ + } +#else +/* NB: left-shift of full bit-width is undefined in C standard. */ + ((struct sockaddr_in*)ifa->ifa_netmask)->sin_addr.s_addr = htonl( 0xffffffffU << ( 32 - prefixLength ) ); +#endif + break; + + case AF_INET6: + if (0 == prefixLength || prefixLength > 128) { + prefixLength = 128; + } + for (LONG i = prefixLength, j = 0; i > 0; i -= 8, ++j) { + ((struct sockaddr_in6*)ifa->ifa_netmask)->sin6_addr.s6_addr[ j ] = i >= 8 ? 0xff : (ULONG)(( 0xffU << ( 8 - i ) ) & 0xffU ); + } + break; + default: + break; + } + } + } + free(pAddresses); + + return 0; +} +#else +#error No reference implementation for getifaddrs available for this platform. +#endif +#endif + static int32_t _sockaddr_in6_scope_id(struct sockaddr_in6* addr) { int32_t res = -1; - struct ifaddrs *ifaddr, *ifa; + struct ifaddrs *ifaddr = NULL, *ifa = NULL; uint32_t addr_scope; /* get scope for requested address */ |