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Add IPv6 support to getifaddrs() on Windows
We now ask both IPv4 and IPv6 addresses to GetAdaptersAddresses Ipv6 address flags fill up is left as a todo because I'm not sure how to get the same information as of Linux I've tested on a x86_64 Windows machine and I get the same informations as of ipconfig.exe
This commit is contained in:
Hugues Morisset
parent
f1e83d5240
commit
71cb861e74
1 changed files with 132 additions and 86 deletions
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@ -43,6 +43,7 @@
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/stack.h"
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#include "libc/serialize.h"
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#include "libc/sock/in.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/struct/ifconf.h"
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#include "libc/sock/struct/ifreq.h"
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@ -68,6 +69,11 @@ static struct HostAdapterInfoNode {
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struct sockaddr unicast;
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struct sockaddr netmask;
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struct sockaddr broadcast;
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uint16_t ifindex6; /* Interface index */
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uint16_t flags6; /* Flags */
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uint8_t scope6; /* Addr scope */
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uint8_t prefixlen6; /* Prefix length */
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struct in6_addr addr6;
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short flags;
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} *__hostInfo;
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@ -153,7 +159,8 @@ static textwindows struct HostAdapterInfoNode *findAdapterByName(
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const char *name) {
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struct HostAdapterInfoNode *node = __hostInfo;
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while (node) {
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if (!strncmp(name, node->name, IFNAMSIZ)) {
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if (!strncmp(name, node->name, IFNAMSIZ) &&
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node->unicast.sa_family == AF_INET) {
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return node;
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}
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node = node->next;
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@ -177,8 +184,8 @@ static textwindows struct HostAdapterInfoNode *appendHostInfo(
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struct NtIpAdapterUnicastAddress *
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*ptrUA, /* Ptr to ptr to unicast address list node */
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struct NtIpAdapterPrefix *
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*ptrAP, /* Ptr to ptr to Adapter prefix list node */
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int count) { /* count is used to create a unique name in case of alias */
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*ptrAP, /* Ptr to ptr to Adapter prefix list node */
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int *ip4cnt) { /* count is used to create a unique name in case of alias */
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struct HostAdapterInfoNode *temp;
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struct HostAdapterInfoNode *node;
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@ -193,44 +200,44 @@ static textwindows struct HostAdapterInfoNode *appendHostInfo(
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memcpy(node->name, baseName, IFNAMSIZ);
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/* Are there more than a single unicast address ? */
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if (count > 0 || ((*ptrUA)->Next != NULL)) {
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/* Yes, compose it using <baseName>:<count> */
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/* Are there more than a single IPv4 unicast address ? */
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if (*ip4cnt > 0) {
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/* Yes, compose it using <baseName>:<ip4cnt> */
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size_t nameLen = strlen(node->name);
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if (nameLen + 2 > IFNAMSIZ - 2) {
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/* Appending the ":x" will exceed the size, need to chop the end */
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nameLen -= 2;
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}
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node->name[nameLen - 2] = ':';
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node->name[nameLen - 1] = '0' + count;
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node->name[nameLen - 1] = '0' + *ip4cnt;
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node->name[nameLen] = '\0';
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}
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/* Is there a name clash with other interfaces? */
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for (attemptNum = 0; attemptNum < MAX_NAME_CLASH; ++attemptNum) {
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temp = findAdapterByName(node->name);
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if (!temp) {
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break;
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} else {
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/* Yes, this name has been already used, append an extra
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* character to resolve conflict. Note since the max length
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* of the string now is IFNAMSIZ-2, we have just enough space for this.
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* E.g. 'Ethernet_1' -> 'Ethernet_1a'
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*/
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size_t pos = strlen(node->name);
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node->name[pos] = 'a' + attemptNum;
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node->name[pos + 1] = '\0';
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/* Try again */
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/* Is there a name clash with other interfaces? */
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for (attemptNum = 0; attemptNum < MAX_NAME_CLASH; ++attemptNum) {
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temp = findAdapterByName(node->name);
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if (!temp) {
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break;
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} else {
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/* Yes, this name has been already used, append an extra
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* character to resolve conflict. Note since the max length
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* of the string now is IFNAMSIZ-2, we have just enough space for this.
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* E.g. 'Ethernet_1' -> 'Ethernet_1a'
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*/
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size_t pos = strlen(node->name);
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node->name[pos] = 'a' + attemptNum;
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node->name[pos + 1] = '\0';
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/* Try again */
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}
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}
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}
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if (attemptNum == MAX_NAME_CLASH) {
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/* Cannot resolve the conflict */
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if (_weaken(free)) {
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_weaken(free)(node);
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if (attemptNum == MAX_NAME_CLASH) {
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/* Cannot resolve the conflict */
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if (_weaken(free)) {
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_weaken(free)(node);
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}
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errno = EEXIST;
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return NULL;
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}
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errno = EEXIST;
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return NULL;
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}
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/* Finally we got a unique short and friendly name */
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@ -267,56 +274,83 @@ static textwindows struct HostAdapterInfoNode *appendHostInfo(
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node->flags = 0;
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}
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ip = ntohl(
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((struct sockaddr_in *)(*ptrUA)->Address.lpSockaddr)->sin_addr.s_addr);
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netmask = (uint32_t)-1 << (32 - (*ptrUA)->OnLinkPrefixLength);
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broadcast = (ip & netmask) | (~netmask & -1);
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int family = ((struct sockaddr_in *)(*ptrUA)->Address.lpSockaddr)->sin_family;
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if (family == AF_INET) {
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*ip4cnt += 1;
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ip = ntohl(
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((struct sockaddr_in *)(*ptrUA)->Address.lpSockaddr)->sin_addr.s_addr);
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netmask = (uint32_t)-1 << (32 - (*ptrUA)->OnLinkPrefixLength);
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broadcast = (ip & netmask) | (~netmask & -1);
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a = (struct sockaddr_in *)&node->netmask;
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a->sin_family = AF_INET;
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a->sin_addr.s_addr = htonl(netmask);
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a = (struct sockaddr_in *)&node->netmask;
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a->sin_family = AF_INET;
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a->sin_addr.s_addr = htonl(netmask);
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a = (struct sockaddr_in *)&node->broadcast;
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a->sin_family = AF_INET;
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a->sin_addr.s_addr = htonl(broadcast);
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a = (struct sockaddr_in *)&node->broadcast;
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a->sin_family = AF_INET;
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a->sin_addr.s_addr = htonl(broadcast);
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/* Process the prefix and extract the netmask and broadcast */
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/* According to the doc:
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*
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* On Windows Vista and later, the linked IP_ADAPTER_PREFIX
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* structures pointed to by the FirstPrefix member include three
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* IP adapter prefixes for each IP address assigned to the
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* adapter. These include the host IP address prefix, the subnet
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* IP address prefix, and the subnet broadcast IP address prefix.
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* In addition, for each adapter there is a multicast address
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* prefix and a broadcast address prefix.
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* -Source: MSDN on IP_ADAPTER_ADDRESSES_LH
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*
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* For example, interface "Ethernet", with 2 unicast addresses:
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*
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* - 192.168.1.84
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* - 192.168.5.99
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*
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* The Prefix list has 8 elements:
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*
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* #1: 192.168.1.0/24 <- Network, use the PrefixLength for netmask
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* #2: 192.168.1.84/32 <- Host IP
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* #3: 192.168.1.255/32 <- Subnet broadcast
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*
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* #4: 192.168.5.0/24 <- Network
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* #5: 192.168.5.99/32 <- Host IP
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* #6: 192.168.5.255/32 <- Subnet broadcast
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*
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* #7: 224.0.0.0/4 <- Multicast
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* #8: 255.255.255.255/32 <- Broadcast
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*/
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/* Process the prefix and extract the netmask and broadcast */
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/* According to the doc:
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*
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* On Windows Vista and later, the linked IP_ADAPTER_PREFIX
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* structures pointed to by the FirstPrefix member include three
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* IP adapter prefixes for each IP address assigned to the
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* adapter. These include the host IP address prefix, the subnet
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* IP address prefix, and the subnet broadcast IP address prefix.
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* In addition, for each adapter there is a multicast address
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* prefix and a broadcast address prefix.
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* -Source: MSDN on IP_ADAPTER_ADDRESSES_LH
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*
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* For example, interface "Ethernet", with 2 unicast addresses:
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*
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* - 192.168.1.84
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* - 192.168.5.99
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*
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* The Prefix list has 8 elements:
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*
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* #1: 192.168.1.0/24 <- Network, use the PrefixLength for netmask
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* #2: 192.168.1.84/32 <- Host IP
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* #3: 192.168.1.255/32 <- Subnet broadcast
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*
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* #4: 192.168.5.0/24 <- Network
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* #5: 192.168.5.99/32 <- Host IP
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* #6: 192.168.5.255/32 <- Subnet broadcast
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*
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* #7: 224.0.0.0/4 <- Multicast
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* #8: 255.255.255.255/32 <- Broadcast
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*/
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if (ptrAP && *ptrAP) {
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*ptrAP = (*ptrAP)->Next; /* skip net ip */
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if (*ptrAP) {
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*ptrAP = (*ptrAP)->Next; /* skip host ip */
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if (ptrAP && *ptrAP) {
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*ptrAP = (*ptrAP)->Next; /* skip net ip */
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if (*ptrAP) {
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node->broadcast = *((*ptrAP)->Address.lpSockaddr);
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*ptrAP = (*ptrAP)->Next; /* skip host ip */
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if (*ptrAP) {
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node->broadcast = *((*ptrAP)->Address.lpSockaddr);
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}
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}
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}
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} else if (family == AF_INET6) {
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node->addr6 =
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((struct sockaddr_in6 *)(*ptrUA)->Address.lpSockaddr)->sin6_addr;
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node->ifindex6 =
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((struct sockaddr_in6 *)(*ptrUA)->Address.lpSockaddr)->sin6_scope_id;
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node->prefixlen6 = (*ptrUA)->OnLinkPrefixLength;
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node->scope6 = 0;
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if (IN6_IS_ADDR_LINKLOCAL(&node->addr6)) {
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node->scope6 = 0x20; // link
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} else if (IN6_IS_ADDR_SITELOCAL(&node->addr6)) {
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node->scope6 = 0x40; // site
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} else if (IN6_IS_ADDR_LOOPBACK(&node->addr6)) {
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node->scope6 = 0x10; // host
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}
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node->flags6 = 0; // TODO ipv6 addr flags
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// Move Prefix ptr
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if (ptrAP && *ptrAP) {
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*ptrAP = (*ptrAP)->Next; /* skip net ip */
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if (*ptrAP) {
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*ptrAP = (*ptrAP)->Next; /* skip host ip */
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}
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}
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}
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@ -341,14 +375,13 @@ static textwindows int createHostInfo(
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struct NtIpAdapterPrefix *ap;
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struct HostAdapterInfoNode *node = NULL;
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char baseName[IFNAMSIZ];
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int count, i;
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int ip4cnt, i;
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/* __hostInfo must be empty */
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unassert(__hostInfo == NULL);
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for (aa = firstAdapter; aa; aa = aa->Next) {
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/* Skip all the interfaces with no address and the ones that are not AF_INET
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/* Skip all the interfaces with no address
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*/
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if (!aa->FirstUnicastAddress ||
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aa->FirstUnicastAddress->Address.lpSockaddr->sa_family != AF_INET) {
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if (!aa->FirstUnicastAddress) {
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continue;
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}
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/* Use max IFNAMSIZ-1 chars, leave the last char for eventual conflicts */
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@ -361,9 +394,11 @@ static textwindows int createHostInfo(
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if (!baseName[i])
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break;
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}
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for (count = 0, ua = aa->FirstUnicastAddress, ap = aa->FirstPrefix;
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(ua != NULL) && (count < MAX_UNICAST_ADDR); ++count) {
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node = appendHostInfo(node, baseName, aa, &ua, &ap, count);
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ua = aa->FirstUnicastAddress;
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ap = aa->FirstPrefix;
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ip4cnt = 0;
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while (ua != NULL) {
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node = appendHostInfo(node, baseName, aa, &ua, &ap, &ip4cnt);
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if (!node)
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goto err;
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if (!__hostInfo) {
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@ -390,9 +425,9 @@ static textwindows int readAdapterAddresses(void) {
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struct NtIpAdapterAddresses *aa = NULL;
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/*
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* Calculate the required data size
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* Note: alternatively you can use AF_UNSPEC to also return IPv6 interfaces
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* Note: AF_UNSPEC return both IPv4 and IPv6 interfaces
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*/
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rc = GetAdaptersAddresses(AF_INET,
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rc = GetAdaptersAddresses(AF_UNSPEC,
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kNtGaaFlagSkipAnycast | kNtGaaFlagSkipMulticast |
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kNtGaaFlagSkipDnsServer |
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kNtGaaFlagIncludePrefix,
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@ -409,7 +444,7 @@ static textwindows int readAdapterAddresses(void) {
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goto err;
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}
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/* Re-run GetAdaptersAddresses this time with a valid buffer */
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rc = GetAdaptersAddresses(AF_INET,
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rc = GetAdaptersAddresses(AF_UNSPEC,
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kNtGaaFlagSkipAnycast | kNtGaaFlagSkipMulticast |
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kNtGaaFlagSkipDnsServer |
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kNtGaaFlagIncludePrefix,
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@ -446,8 +481,19 @@ static textwindows int ioctl_siocgifconf_nt(int fd, struct ifconf *ifc) {
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for (ptr = ifc->ifc_req, node = __hostInfo;
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(((char *)(ptr + 1) - ifc->ifc_buf) < ifc->ifc_len) && node;
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ptr++, node = node->next) {
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bzero(ptr, sizeof(struct ifreq));
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memcpy(ptr->ifr_name, node->name, IFNAMSIZ);
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memcpy(&ptr->ifr_addr, &node->unicast, sizeof(struct sockaddr));
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int family = node->unicast.sa_family;
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if (family == AF_INET) {
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memcpy(&ptr->ifr_addr, &node->unicast, sizeof(struct sockaddr));
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} else if (family == AF_INET6) {
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ptr->ifr_ifru.in6.sa_family = AF_INET6;
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ptr->ifr6_ifindex = node->ifindex6;
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ptr->ifr6_flags = node->flags6;
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ptr->ifr6_scope = node->scope6;
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ptr->ifr6_prefixlen = node->prefixlen6;
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memcpy(&ptr->ifr6_addr, &node->addr6, sizeof(struct in6_addr));
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}
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}
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ifc->ifc_len = (char *)ptr - ifc->ifc_buf;
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return 0;
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