blob: 0699cebb3c0d432e185a3c6e790edd61279b1a54 [file] [log] [blame]
#include "mock_syscall.hpp"
#include "util.hpp"
#include <arpa/inet.h>
#include <dlfcn.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <cstdarg>
#include <cstdio>
#include <cstring>
#include <map>
#include <queue>
#include <stdexcept>
#include <stdplus/raw.hpp>
#include <string>
#include <string_view>
#include <vector>
std::map<int, std::queue<std::string>> mock_rtnetlinks;
using phosphor::network::InterfaceInfo;
std::map<std::string, InterfaceInfo> mock_if;
void phosphor::network::system::mock_clear()
{
mock_rtnetlinks.clear();
mock_if.clear();
}
void phosphor::network::system::mock_addIF(const InterfaceInfo& info)
{
if (info.idx == 0)
{
throw std::invalid_argument("Bad interface index");
}
for (const auto& [_, iinfo] : mock_if)
{
if (iinfo.idx == info.idx || iinfo.name == info.name)
{
throw std::invalid_argument("Interface already exists");
}
}
mock_if.emplace(info.name.value(), info);
}
void validateMsgHdr(const struct msghdr* msg)
{
if (msg->msg_namelen != sizeof(sockaddr_nl))
{
fprintf(stderr, "bad namelen: %u\n", msg->msg_namelen);
abort();
}
const auto& from = *reinterpret_cast<sockaddr_nl*>(msg->msg_name);
if (from.nl_family != AF_NETLINK)
{
fprintf(stderr, "recvmsg bad family data\n");
abort();
}
if (msg->msg_iovlen != 1)
{
fprintf(stderr, "recvmsg unsupported iov configuration\n");
abort();
}
}
void appendRTAttr(std::string& msgBuf, unsigned short type,
std::string_view data)
{
const auto rta_begin = msgBuf.size();
msgBuf.append(RTA_SPACE(data.size()), '\0');
auto& rta = *reinterpret_cast<rtattr*>(msgBuf.data() + rta_begin);
rta.rta_len = RTA_LENGTH(data.size());
rta.rta_type = type;
std::copy(data.begin(), data.end(),
msgBuf.data() + rta_begin + RTA_LENGTH(0));
}
ssize_t sendmsg_link_dump(std::queue<std::string>& msgs, std::string_view in)
{
if (const auto& hdrin = *reinterpret_cast<const nlmsghdr*>(in.data());
hdrin.nlmsg_type != RTM_GETLINK)
{
return 0;
}
std::string msgBuf;
msgBuf.reserve(8192);
for (const auto& [name, i] : mock_if)
{
if (msgBuf.size() > 4096)
{
msgs.emplace(std::move(msgBuf));
}
const auto nlbegin = msgBuf.size();
msgBuf.append(NLMSG_SPACE(sizeof(ifinfomsg)), '\0');
{
auto& info = *reinterpret_cast<ifinfomsg*>(msgBuf.data() + nlbegin +
NLMSG_HDRLEN);
info.ifi_index = i.idx;
info.ifi_flags = i.flags;
}
if (i.name)
{
appendRTAttr(msgBuf, IFLA_IFNAME, {name.data(), name.size() + 1});
}
if (i.mac)
{
appendRTAttr(msgBuf, IFLA_ADDRESS,
stdplus::raw::asView<char>(*i.mac));
}
if (i.mtu)
{
appendRTAttr(msgBuf, IFLA_MTU, stdplus::raw::asView<char>(*i.mtu));
}
auto& hdr = *reinterpret_cast<nlmsghdr*>(msgBuf.data() + nlbegin);
hdr.nlmsg_len = msgBuf.size() - nlbegin;
hdr.nlmsg_type = RTM_NEWLINK;
hdr.nlmsg_flags = NLM_F_MULTI;
msgBuf.resize(NLMSG_ALIGN(msgBuf.size()), '\0');
}
const auto nlbegin = msgBuf.size();
msgBuf.append(NLMSG_SPACE(0), '\0');
auto& hdr = *reinterpret_cast<nlmsghdr*>(msgBuf.data() + nlbegin);
hdr.nlmsg_len = NLMSG_LENGTH(0);
hdr.nlmsg_type = NLMSG_DONE;
hdr.nlmsg_flags = NLM_F_MULTI;
msgs.emplace(std::move(msgBuf));
return in.size();
}
ssize_t sendmsg_ack(std::queue<std::string>& msgs, std::string_view in)
{
nlmsgerr ack{};
nlmsghdr hdr{};
hdr.nlmsg_len = NLMSG_LENGTH(sizeof(ack));
hdr.nlmsg_type = NLMSG_ERROR;
auto& out = msgs.emplace(hdr.nlmsg_len, '\0');
memcpy(out.data(), &hdr, sizeof(hdr));
memcpy(NLMSG_DATA(out.data()), &ack, sizeof(ack));
return in.size();
}
extern "C" {
int ioctl(int fd, unsigned long int request, ...)
{
va_list vl;
va_start(vl, request);
void* data = va_arg(vl, void*);
va_end(vl);
auto req = reinterpret_cast<ifreq*>(data);
if (request == SIOCGIFFLAGS)
{
auto it = mock_if.find(req->ifr_name);
if (it == mock_if.end())
{
errno = ENXIO;
return -1;
}
req->ifr_flags = it->second.flags;
return 0;
}
else if (request == SIOCGIFMTU)
{
auto it = mock_if.find(req->ifr_name);
if (it == mock_if.end())
{
errno = ENXIO;
return -1;
}
if (!it->second.mtu)
{
errno = EOPNOTSUPP;
return -1;
}
req->ifr_mtu = *it->second.mtu;
return 0;
}
static auto real_ioctl =
reinterpret_cast<decltype(&ioctl)>(dlsym(RTLD_NEXT, "ioctl"));
return real_ioctl(fd, request, data);
}
int socket(int domain, int type, int protocol)
{
static auto real_socket =
reinterpret_cast<decltype(&socket)>(dlsym(RTLD_NEXT, "socket"));
int fd = real_socket(domain, type, protocol);
if (domain == AF_NETLINK && !(type & SOCK_RAW))
{
fprintf(stderr, "Netlink sockets must be RAW\n");
abort();
}
if (domain == AF_NETLINK && protocol == NETLINK_ROUTE)
{
mock_rtnetlinks[fd] = {};
}
return fd;
}
int close(int fd)
{
auto it = mock_rtnetlinks.find(fd);
if (it != mock_rtnetlinks.end())
{
mock_rtnetlinks.erase(it);
}
static auto real_close =
reinterpret_cast<decltype(&close)>(dlsym(RTLD_NEXT, "close"));
return real_close(fd);
}
ssize_t sendmsg(int sockfd, const struct msghdr* msg, int flags)
{
auto it = mock_rtnetlinks.find(sockfd);
if (it == mock_rtnetlinks.end())
{
static auto real_sendmsg =
reinterpret_cast<decltype(&sendmsg)>(dlsym(RTLD_NEXT, "sendmsg"));
return real_sendmsg(sockfd, msg, flags);
}
auto& msgs = it->second;
validateMsgHdr(msg);
if (!msgs.empty())
{
fprintf(stderr, "Unread netlink responses\n");
abort();
}
ssize_t ret;
std::string_view iov(reinterpret_cast<char*>(msg->msg_iov[0].iov_base),
msg->msg_iov[0].iov_len);
ret = sendmsg_link_dump(msgs, iov);
if (ret != 0)
{
return ret;
}
ret = sendmsg_ack(msgs, iov);
if (ret != 0)
{
return ret;
}
errno = ENOSYS;
return -1;
}
ssize_t recvmsg(int sockfd, struct msghdr* msg, int flags)
{
auto it = mock_rtnetlinks.find(sockfd);
if (it == mock_rtnetlinks.end())
{
static auto real_recvmsg =
reinterpret_cast<decltype(&recvmsg)>(dlsym(RTLD_NEXT, "recvmsg"));
return real_recvmsg(sockfd, msg, flags);
}
auto& msgs = it->second;
validateMsgHdr(msg);
constexpr size_t required_buf_size = 8192;
if (msg->msg_iov[0].iov_len < required_buf_size)
{
fprintf(stderr, "recvmsg iov too short: %zu\n",
msg->msg_iov[0].iov_len);
abort();
}
if (msgs.empty())
{
fprintf(stderr, "No pending netlink responses\n");
abort();
}
ssize_t ret = 0;
auto data = reinterpret_cast<char*>(msg->msg_iov[0].iov_base);
while (!msgs.empty())
{
const auto& msg = msgs.front();
if (NLMSG_ALIGN(ret) + msg.size() > required_buf_size)
{
break;
}
ret = NLMSG_ALIGN(ret);
memcpy(data + ret, msg.data(), msg.size());
ret += msg.size();
msgs.pop();
}
return ret;
}
} // extern "C"