kaguya
116 lines
2.3 KiB
C++
116 lines
2.3 KiB
C++
#include <errno.h>
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#include <mlibc/all-sysdeps.hpp>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "generic-helpers/netlink.hpp"
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namespace mlibc {
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int sys_if_indextoname(unsigned int index, char *name) {
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int fd = 0;
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int r = sys_socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, AF_UNSPEC, &fd);
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if (r)
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return r;
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struct ifreq ifr;
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ifr.ifr_ifindex = index;
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int res = 0;
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int ret = sys_ioctl(fd, SIOCGIFNAME, &ifr, &res);
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close(fd);
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if (ret) {
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if (ret == ENODEV)
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return ENXIO;
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return ret;
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}
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strncpy(name, ifr.ifr_name, IF_NAMESIZE);
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return 0;
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}
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int sys_if_nametoindex(const char *name, unsigned int *ret) {
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int fd = 0;
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int r = sys_socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, AF_UNSPEC, &fd);
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if (r)
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return r;
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struct ifreq ifr;
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strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
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int res = 0;
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r = sys_ioctl(fd, SIOCGIFINDEX, &ifr, &res);
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close(fd);
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if (r)
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return r;
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*ret = ifr.ifr_ifindex;
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return 0;
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}
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int sys_getifaddrs(struct ifaddrs **out) {
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NetlinkHelper nl;
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*out = nullptr;
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bool link_ret = nl.send_request(RTM_GETLINK) && nl.recv(&getifaddrs_callback, out);
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__ensure(link_ret);
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bool addr_ret = nl.send_request(RTM_GETADDR) && nl.recv(&getifaddrs_callback, out);
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__ensure(addr_ret);
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return 0;
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}
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#if !defined(MLIBC_BUILDING_RTLD)
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int sys_inet_configured(bool *ipv4, bool *ipv6) {
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struct context {
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bool *ipv4;
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bool *ipv6;
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} context = {.ipv4 = ipv4, .ipv6 = ipv6};
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NetlinkHelper nl;
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if (!nl.send_request(RTM_GETADDR)) {
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*ipv4 = false;
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*ipv6 = false;
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return 0;
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}
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auto ret = nl.recv(
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[](void *data, const nlmsghdr *hdr) {
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if (hdr->nlmsg_type == RTM_NEWADDR || hdr->nlmsg_len >= sizeof(struct ifaddrmsg)) {
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const struct ifaddrmsg *ifaddr =
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reinterpret_cast<const struct ifaddrmsg *>(NLMSG_DATA(hdr));
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struct context *ctx = reinterpret_cast<struct context *>(data);
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char name[IF_NAMESIZE];
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auto interfaceNameResult = sys_if_indextoname(ifaddr->ifa_index, name);
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if (interfaceNameResult || !strncmp(name, "lo", IF_NAMESIZE))
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return;
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if (ifaddr->ifa_family == AF_INET)
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*ctx->ipv4 = true;
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else if (ifaddr->ifa_family == AF_INET6)
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*ctx->ipv6 = true;
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}
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},
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&context
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);
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if (!ret) {
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*ipv4 = false;
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*ipv6 = false;
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return 0;
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}
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return 0;
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}
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#endif // !defined(MLIBC_BUILDING_RTLD)
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} // namespace mlibc
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