assume unix
| 524 | } |
| 525 | #else // assume unix |
| 526 | int GetMTUUnix (const boost::asio::ip::address& localAddress, int fallback) |
| 527 | { |
| 528 | ifaddrs* ifaddr, *ifa = nullptr; |
| 529 | if (getifaddrs(&ifaddr) == -1) |
| 530 | { |
| 531 | LogPrint(eLogError, "NetIface: Can't call getifaddrs(): ", strerror(errno)); |
| 532 | return fallback; |
| 533 | } |
| 534 | |
| 535 | int family = 0; |
| 536 | // look for interface matching local address |
| 537 | for (ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) |
| 538 | { |
| 539 | if (!ifa->ifa_addr) |
| 540 | continue; |
| 541 | |
| 542 | family = ifa->ifa_addr->sa_family; |
| 543 | if (family == AF_INET && localAddress.is_v4()) |
| 544 | { |
| 545 | sockaddr_in* sa = (sockaddr_in*) ifa->ifa_addr; |
| 546 | if (!memcmp(&sa->sin_addr, localAddress.to_v4().to_bytes().data(), 4)) |
| 547 | break; // address matches |
| 548 | } |
| 549 | else if (family == AF_INET6 && localAddress.is_v6()) |
| 550 | { |
| 551 | sockaddr_in6* sa = (sockaddr_in6*) ifa->ifa_addr; |
| 552 | if (!memcmp(&sa->sin6_addr, localAddress.to_v6().to_bytes().data(), 16)) |
| 553 | break; // address matches |
| 554 | } |
| 555 | } |
| 556 | int mtu = fallback; |
| 557 | if (ifa && family) |
| 558 | { // interface found? |
| 559 | int fd = socket(family, SOCK_DGRAM, 0); |
| 560 | if (fd > 0) |
| 561 | { |
| 562 | ifreq ifr; |
| 563 | strncpy(ifr.ifr_name, ifa->ifa_name, IFNAMSIZ-1); // set interface for query |
| 564 | if (ioctl(fd, SIOCGIFMTU, &ifr) >= 0) |
| 565 | mtu = ifr.ifr_mtu; // MTU |
| 566 | else |
| 567 | LogPrint (eLogError, "NetIface: Failed to run ioctl: ", strerror(errno)); |
| 568 | close(fd); |
| 569 | } |
| 570 | else |
| 571 | LogPrint(eLogError, "NetIface: Failed to create datagram socket"); |
| 572 | } |
| 573 | else |
| 574 | LogPrint(eLogWarning, "NetIface: Interface for local address", localAddress.to_string(), " not found"); |
| 575 | freeifaddrs(ifaddr); |
| 576 | |
| 577 | return mtu; |
| 578 | } |
| 579 | #endif // _WIN32 |
| 580 | |
| 581 | int GetMTU (const boost::asio::ip::address& localAddress) |
no test coverage detected