From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- third_party/libwebrtc/rtc_base/ifaddrs_android.cc | 227 ++++++++++++++++++++++ 1 file changed, 227 insertions(+) create mode 100644 third_party/libwebrtc/rtc_base/ifaddrs_android.cc (limited to 'third_party/libwebrtc/rtc_base/ifaddrs_android.cc') diff --git a/third_party/libwebrtc/rtc_base/ifaddrs_android.cc b/third_party/libwebrtc/rtc_base/ifaddrs_android.cc new file mode 100644 index 0000000000..6474fb7244 --- /dev/null +++ b/third_party/libwebrtc/rtc_base/ifaddrs_android.cc @@ -0,0 +1,227 @@ +/* + * Copyright 2012 The WebRTC Project Authors. All rights reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#if defined(WEBRTC_ANDROID) +#include "rtc_base/ifaddrs_android.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "absl/cleanup/cleanup.h" + +namespace { + +struct netlinkrequest { + nlmsghdr header; + ifaddrmsg msg; +}; + +const int kMaxReadSize = 4096; + +} // namespace + +namespace rtc { + +int set_ifname(struct ifaddrs* ifaddr, int interface) { + char buf[IFNAMSIZ] = {0}; + char* name = if_indextoname(interface, buf); + if (name == nullptr) { + return -1; + } + ifaddr->ifa_name = new char[strlen(name) + 1]; + strncpy(ifaddr->ifa_name, name, strlen(name) + 1); + return 0; +} + +int set_flags(struct ifaddrs* ifaddr) { + int fd = socket(AF_INET, SOCK_DGRAM, 0); + if (fd == -1) { + return -1; + } + ifreq ifr; + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, ifaddr->ifa_name, IFNAMSIZ - 1); + int rc = ioctl(fd, SIOCGIFFLAGS, &ifr); + close(fd); + if (rc == -1) { + return -1; + } + ifaddr->ifa_flags = ifr.ifr_flags; + return 0; +} + +int set_addresses(struct ifaddrs* ifaddr, + ifaddrmsg* msg, + void* data, + size_t len) { + if (msg->ifa_family == AF_INET) { + sockaddr_in* sa = new sockaddr_in; + sa->sin_family = AF_INET; + memcpy(&sa->sin_addr, data, len); + ifaddr->ifa_addr = reinterpret_cast(sa); + } else if (msg->ifa_family == AF_INET6) { + sockaddr_in6* sa = new sockaddr_in6; + sa->sin6_family = AF_INET6; + sa->sin6_scope_id = msg->ifa_index; + memcpy(&sa->sin6_addr, data, len); + ifaddr->ifa_addr = reinterpret_cast(sa); + } else { + return -1; + } + return 0; +} + +int make_prefixes(struct ifaddrs* ifaddr, int family, int prefixlen) { + char* prefix = nullptr; + if (family == AF_INET) { + sockaddr_in* mask = new sockaddr_in; + mask->sin_family = AF_INET; + memset(&mask->sin_addr, 0, sizeof(in_addr)); + ifaddr->ifa_netmask = reinterpret_cast(mask); + if (prefixlen > 32) { + prefixlen = 32; + } + prefix = reinterpret_cast(&mask->sin_addr); + } else if (family == AF_INET6) { + sockaddr_in6* mask = new sockaddr_in6; + mask->sin6_family = AF_INET6; + memset(&mask->sin6_addr, 0, sizeof(in6_addr)); + ifaddr->ifa_netmask = reinterpret_cast(mask); + if (prefixlen > 128) { + prefixlen = 128; + } + prefix = reinterpret_cast(&mask->sin6_addr); + } else { + return -1; + } + for (int i = 0; i < (prefixlen / 8); i++) { + *prefix++ = 0xFF; + } + char remainder = 0xff; + remainder <<= (8 - prefixlen % 8); + *prefix = remainder; + return 0; +} + +int populate_ifaddrs(struct ifaddrs* ifaddr, + ifaddrmsg* msg, + void* bytes, + size_t len) { + if (set_ifname(ifaddr, msg->ifa_index) != 0) { + return -1; + } + if (set_flags(ifaddr) != 0) { + return -1; + } + if (set_addresses(ifaddr, msg, bytes, len) != 0) { + return -1; + } + if (make_prefixes(ifaddr, msg->ifa_family, msg->ifa_prefixlen) != 0) { + return -1; + } + return 0; +} + +int getifaddrs(struct ifaddrs** result) { + *result = nullptr; + int fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); + if (fd < 0) { + return -1; + } + absl::Cleanup close_file = [fd] { close(fd); }; + + netlinkrequest ifaddr_request; + memset(&ifaddr_request, 0, sizeof(ifaddr_request)); + ifaddr_request.header.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST; + ifaddr_request.header.nlmsg_type = RTM_GETADDR; + ifaddr_request.header.nlmsg_len = NLMSG_LENGTH(sizeof(ifaddrmsg)); + + ssize_t count = send(fd, &ifaddr_request, ifaddr_request.header.nlmsg_len, 0); + if (static_cast(count) != ifaddr_request.header.nlmsg_len) { + return -1; + } + struct ifaddrs* start = nullptr; + absl::Cleanup cleanup_start = [&start] { freeifaddrs(start); }; + struct ifaddrs* current = nullptr; + char buf[kMaxReadSize]; + ssize_t amount_read = recv(fd, &buf, kMaxReadSize, 0); + while (amount_read > 0) { + nlmsghdr* header = reinterpret_cast(&buf[0]); + size_t header_size = static_cast(amount_read); + for (; NLMSG_OK(header, header_size); + header = NLMSG_NEXT(header, header_size)) { + switch (header->nlmsg_type) { + case NLMSG_DONE: + // Success. Return `start`. Cancel `start` cleanup because it + // becomes callers responsibility. + std::move(cleanup_start).Cancel(); + *result = start; + return 0; + case NLMSG_ERROR: + return -1; + case RTM_NEWADDR: { + ifaddrmsg* address_msg = + reinterpret_cast(NLMSG_DATA(header)); + rtattr* rta = IFA_RTA(address_msg); + ssize_t payload_len = IFA_PAYLOAD(header); + while (RTA_OK(rta, payload_len)) { + if ((address_msg->ifa_family == AF_INET && + rta->rta_type == IFA_LOCAL) || + (address_msg->ifa_family == AF_INET6 && + rta->rta_type == IFA_ADDRESS)) { + ifaddrs* newest = new ifaddrs; + memset(newest, 0, sizeof(ifaddrs)); + if (current) { + current->ifa_next = newest; + } else { + start = newest; + } + if (populate_ifaddrs(newest, address_msg, RTA_DATA(rta), + RTA_PAYLOAD(rta)) != 0) { + return -1; + } + current = newest; + } + rta = RTA_NEXT(rta, payload_len); + } + break; + } + } + } + amount_read = recv(fd, &buf, kMaxReadSize, 0); + } + return -1; +} + +void freeifaddrs(struct ifaddrs* addrs) { + struct ifaddrs* last = nullptr; + struct ifaddrs* cursor = addrs; + while (cursor) { + delete[] cursor->ifa_name; + delete cursor->ifa_addr; + delete cursor->ifa_netmask; + last = cursor; + cursor = cursor->ifa_next; + delete last; + } +} + +} // namespace rtc +#endif // defined(WEBRTC_ANDROID) -- cgit v1.2.3