mirror of
https://github.com/rui314/mold.git
synced 2024-09-22 10:27:48 +03:00
264 lines
6.7 KiB
C++
264 lines
6.7 KiB
C++
#include "mold.h"
|
|
|
|
#include <openssl/sha.h>
|
|
#include <sys/signal.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <sys/un.h>
|
|
#include <sys/wait.h>
|
|
#include <unistd.h>
|
|
|
|
#define DAEMON_TIMEOUT 30
|
|
|
|
// Exiting from a program with large memory usage is slow --
|
|
// it may take a few hundred milliseconds. To hide the latency,
|
|
// we fork a child and let it do the actual linking work.
|
|
std::function<void()> fork_child() {
|
|
int pipefd[2];
|
|
if (pipe(pipefd) == -1) {
|
|
perror("pipe");
|
|
exit(1);
|
|
}
|
|
|
|
pid_t pid = fork();
|
|
if (pid == -1) {
|
|
perror("fork");
|
|
exit(1);
|
|
}
|
|
|
|
if (pid > 0) {
|
|
// Parent
|
|
close(pipefd[1]);
|
|
if (read(pipefd[0], (char[1]){}, 1) == 1)
|
|
_exit(0);
|
|
|
|
int status;
|
|
waitpid(pid, &status, 0);
|
|
|
|
if (WIFEXITED(status))
|
|
_exit(WEXITSTATUS(status));
|
|
if (WIFSIGNALED(status))
|
|
raise(WTERMSIG(status));
|
|
_exit(1);
|
|
}
|
|
|
|
// Child
|
|
close(pipefd[0]);
|
|
return [=]() { write(pipefd[1], (char []){1}, 1); };
|
|
}
|
|
|
|
static std::string base64(u8 *data, u64 size) {
|
|
static const char chars[] =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+_";
|
|
|
|
std::ostringstream out;
|
|
|
|
auto encode = [&](u32 x) {
|
|
out << chars[x & 0b111111]
|
|
<< chars[(x >> 6) & 0b111111]
|
|
<< chars[(x >> 12) & 0b111111]
|
|
<< chars[(x >> 18) & 0b111111];
|
|
};
|
|
|
|
i64 i = 0;
|
|
for (; i < size - 3; i += 3)
|
|
encode((data[i + 2] << 16) | (data[i + 1] << 8) | data[i]);
|
|
|
|
if (i == size - 1)
|
|
encode(data[i]);
|
|
else if (i == size - 2)
|
|
encode((data[i + 1] << 8) | data[i]);
|
|
return out.str();
|
|
}
|
|
|
|
static std::string compute_sha256(char **argv) {
|
|
SHA256_CTX sha;
|
|
SHA256_Init(&sha);
|
|
|
|
for (i64 i = 0; argv[i]; i++)
|
|
if (!strcmp(argv[i], "-preload") && !strcmp(argv[i], "--preload"))
|
|
SHA256_Update(&sha, argv[i], strlen(argv[i]) + 1);
|
|
|
|
u8 digest[SHA256_SIZE];
|
|
SHA256_Final(digest, &sha);
|
|
return base64(digest, SHA256_SIZE);
|
|
}
|
|
|
|
template <typename E>
|
|
static void send_fd(Context<E> &ctx, i64 conn, i64 fd) {
|
|
struct iovec iov;
|
|
char dummy = '1';
|
|
iov.iov_base = &dummy;
|
|
iov.iov_len = 1;
|
|
|
|
struct msghdr msg = {};
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
|
|
char buf[CMSG_SPACE(sizeof(int))];
|
|
msg.msg_control = buf;
|
|
msg.msg_controllen = CMSG_LEN(sizeof(int));
|
|
|
|
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
*(int *)CMSG_DATA(cmsg) = fd;
|
|
|
|
if (sendmsg(conn, &msg, 0) == -1)
|
|
Fatal(ctx) << "sendmsg failed: " << strerror(errno);
|
|
}
|
|
|
|
template <typename E>
|
|
static i64 recv_fd(Context<E> &ctx, i64 conn) {
|
|
struct iovec iov;
|
|
char buf[1];
|
|
iov.iov_base = buf;
|
|
iov.iov_len = sizeof(buf);
|
|
|
|
struct msghdr msg = {};
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
|
|
char cmsgbuf[CMSG_SPACE(sizeof(int))];
|
|
msg.msg_control = (caddr_t)cmsgbuf;
|
|
msg.msg_controllen = sizeof(cmsgbuf);
|
|
|
|
i64 len = recvmsg(conn, &msg, 0);
|
|
if (len <= 0)
|
|
Fatal(ctx) << "recvmsg failed: " << strerror(errno);
|
|
|
|
struct cmsghdr *cmsg;
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
return *(int *)CMSG_DATA(cmsg);
|
|
}
|
|
|
|
template <typename E>
|
|
bool resume_daemon(Context<E> &ctx, char **argv, i64 *code) {
|
|
i64 conn = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if (conn == -1)
|
|
Fatal(ctx) << "socket failed: " << strerror(errno);
|
|
|
|
std::string path = "/tmp/mold-" + compute_sha256(argv);
|
|
|
|
struct sockaddr_un name = {};
|
|
name.sun_family = AF_UNIX;
|
|
memcpy(name.sun_path, path.data(), path.size());
|
|
|
|
if (connect(conn, (struct sockaddr *)&name, sizeof(name)) != 0) {
|
|
close(conn);
|
|
return false;
|
|
}
|
|
|
|
send_fd(ctx, conn, STDOUT_FILENO);
|
|
send_fd(ctx, conn, STDERR_FILENO);
|
|
i64 r = read(conn, (char[1]){}, 1);
|
|
*code = (r != 1);
|
|
return true;
|
|
}
|
|
|
|
template <typename E>
|
|
void daemonize(Context<E> &ctx, char **argv,
|
|
std::function<void()> *wait_for_client,
|
|
std::function<void()> *on_complete) {
|
|
if (daemon(1, 0) == -1)
|
|
Fatal(ctx) << "daemon failed: " << strerror(errno);
|
|
|
|
i64 sock = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if (sock == -1)
|
|
Fatal(ctx) << "socket failed: " << strerror(errno);
|
|
|
|
socket_tmpfile = strdup(("/tmp/mold-" + compute_sha256(argv)).c_str());
|
|
|
|
struct sockaddr_un name = {};
|
|
name.sun_family = AF_UNIX;
|
|
strcpy(name.sun_path, socket_tmpfile);
|
|
|
|
u32 orig_mask = umask(0177);
|
|
|
|
if (bind(sock, (struct sockaddr *)&name, sizeof(name)) == -1) {
|
|
if (errno != EADDRINUSE)
|
|
Fatal(ctx) << "bind failed: " << strerror(errno);
|
|
|
|
unlink(socket_tmpfile);
|
|
if (bind(sock, (struct sockaddr *)&name, sizeof(name)) == -1)
|
|
Fatal(ctx) << "bind failed: " << strerror(errno);
|
|
}
|
|
|
|
umask(orig_mask);
|
|
|
|
if (listen(sock, 0) == -1)
|
|
Fatal(ctx) << "listen failed: " << strerror(errno);
|
|
|
|
static i64 conn = -1;
|
|
|
|
*wait_for_client = [=, &ctx]() {
|
|
fd_set rfds;
|
|
FD_ZERO(&rfds);
|
|
FD_SET(sock, &rfds);
|
|
|
|
struct timeval tv;
|
|
tv.tv_sec = DAEMON_TIMEOUT;
|
|
tv.tv_usec = 0;
|
|
|
|
i64 res = select(sock + 1, &rfds, NULL, NULL, &tv);
|
|
if (res == -1)
|
|
Fatal(ctx) << "select failed: " << strerror(errno);
|
|
|
|
if (res == 0) {
|
|
std::cout << "timeout\n";
|
|
exit(0);
|
|
}
|
|
|
|
conn = accept(sock, NULL, NULL);
|
|
if (conn == -1)
|
|
Fatal(ctx) << "accept failed: " << strerror(errno);
|
|
unlink(socket_tmpfile);
|
|
|
|
dup2(recv_fd(ctx, conn), STDOUT_FILENO);
|
|
dup2(recv_fd(ctx, conn), STDERR_FILENO);
|
|
};
|
|
|
|
*on_complete = [=]() { write(conn, (char []){1}, 1); };
|
|
}
|
|
|
|
template <typename E>
|
|
static std::string get_self_path(Context<E> &ctx) {
|
|
char buf[4096];
|
|
i64 n = readlink("/proc/self/exe", buf, sizeof(buf));
|
|
if (n == -1)
|
|
Fatal(ctx) << "readlink(\"/proc/self/exe\") failed: " << strerror(errno);
|
|
if (n == sizeof(buf))
|
|
Fatal(ctx) << "readlink: path too long";
|
|
return buf;
|
|
}
|
|
|
|
template <typename E>
|
|
[[noreturn]]
|
|
void process_run_subcommand(Context<E> &ctx, int argc, char **argv) {
|
|
std::string_view arg1 = argv[1];
|
|
assert(arg1 == "-run" || arg1 == "--run");
|
|
|
|
if (!argv[2])
|
|
Fatal(ctx) << "-run: argument missing";
|
|
|
|
std::string self = get_self_path(ctx);
|
|
std::string env = "LD_PRELOAD=" + path_dirname(self) + "/mold-wrapper.so";
|
|
putenv(strdup(env.c_str()));
|
|
putenv(strdup(("MOLD_REAL_PATH=" + self).c_str()));
|
|
|
|
execvp(argv[2], argv + 2);
|
|
Fatal(ctx) << "execvp failed: " << strerror(errno);
|
|
}
|
|
|
|
#define INSTANTIATE(E) \
|
|
template bool resume_daemon(Context<E> &, char **, i64 *); \
|
|
template void daemonize(Context<E> &, char **, \
|
|
std::function<void()> *, \
|
|
std::function<void()> *); \
|
|
template void process_run_subcommand(Context<E> &, int, char **)
|
|
|
|
INSTANTIATE(X86_64);
|
|
INSTANTIATE(I386);
|