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runit.c
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runit.c
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "tool/build/runit.h"
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/itimerval.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/timespec.h"
#include "libc/errno.h"
#include "libc/fmt/libgen.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/safemacros.h"
#include "libc/limits.h"
#include "libc/log/check.h"
#include "libc/log/log.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/serialize.h"
#include "libc/sock/ipclassify.internal.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/af.h"
#include "libc/sysv/consts/ex.h"
#include "libc/sysv/consts/ipproto.h"
#include "libc/sysv/consts/itimer.h"
#include "libc/sysv/consts/limits.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/consts/sock.h"
#include "libc/temp.h"
#include "libc/x/xasprintf.h"
#include "net/https/https.h"
#include "third_party/mbedtls/net_sockets.h"
#include "third_party/mbedtls/ssl.h"
#include "third_party/musl/netdb.h"
#include "third_party/zlib/zlib.h"
#include "tool/build/lib/eztls.h"
#include "tool/build/lib/psk.h"
#define MAX_WAIT_CONNECT_SECONDS 12
#define INITIAL_CONNECT_TIMEOUT 100000
/**
* @fileoverview Remote test runner.
*
* We want to scp .com binaries to remote machines and run them. The
* problem is that SSH is the slowest thing imaginable, taking about
* 300ms to connect to a host that's merely half a millisecond away.
*
* This program takes 17ms using elliptic curve diffie hellman exchange
* where we favor a 32-byte binary preshared key (~/.runit.psk) instead
* of certificates. It's how long it takes to connect, copy the binary,
* and run it. The remote daemon is deployed via SSH if it's not there.
*
* o/default/tool/build/runit \
* o/default/tool/build/runitd \
* o/default/test/libc/mem/qsort_test \
* freebsd.test.:31337:22
*
* APE binaries are hermetic and embed dependent files within their zip
* structure, which is why all we need is this simple test runner tool.
* The only thing that needs to be configured is /etc/hosts or Bind, to
* assign numbers to the officially reserved canned names. For example:
*
* 192.168.0.10 windows.test. windows
* 192.168.0.11 freebsd.test. freebsd
* 192.168.0.12 openbsd.test. openbsd
*
* Life is easiest if SSH public key authentication is configured too.
* It can be tuned as follows in ~/.ssh/config:
*
* host windows.test.
* user testacct
* host freebsd.test.
* user testacct
* host openbsd.test.
* user testacct
*
* Firewalls may need to be configured as well, to allow port tcp:31337
* from the local subnet. For example:
*
* iptables -L -vn
* iptables -I INPUT 1 -s 10.0.0.0/8 -p tcp --dport 31337 -j ACCEPT
* iptables -I INPUT 1 -s 192.168.0.0/16 -p tcp --dport 31337 -j ACCEPT
*
* This tool may be used in zero trust environments.
*/
static const struct addrinfo kResolvHints = {.ai_family = AF_INET,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP};
int g_sock;
char *g_prog;
long g_backoff;
char *g_runitd;
jmp_buf g_jmpbuf;
uint16_t g_sshport;
int connect_latency;
int execute_latency;
int handshake_latency;
char g_hostname[128];
uint16_t g_runitdport;
volatile bool alarmed;
int __sys_execve(const char *, char *const[], char *const[]);
static void OnAlarm(int sig) {
alarmed = true;
}
wontreturn void ShowUsage(FILE *f, int rc) {
fprintf(f, "Usage: %s RUNITD PROGRAM HOSTNAME[:RUNITDPORT[:SSHPORT]]...\n",
program_invocation_name);
exit(rc);
__builtin_unreachable();
}
void CheckExists(const char *path) {
if (!isregularfile(path)) {
fprintf(stderr, "error: %s: not found or irregular\n", path);
ShowUsage(stderr, EX_USAGE);
__builtin_unreachable();
}
}
void Connect(void) {
const char *ip4;
int rc, err, expo;
struct addrinfo *ai;
struct timespec deadline;
if ((rc = getaddrinfo(g_hostname, gc(xasprintf("%hu", g_runitdport)),
&kResolvHints, &ai)) != 0) {
FATALF("%s:%hu: DNS lookup failed: %s", g_hostname, g_runitdport,
gai_strerror(rc));
__builtin_unreachable();
}
ip4 = (const char *)&((struct sockaddr_in *)ai->ai_addr)->sin_addr;
DEBUGF("connecting to %d.%d.%d.%d port %d", ip4[0], ip4[1], ip4[2], ip4[3],
ntohs(((struct sockaddr_in *)ai->ai_addr)->sin_port));
CHECK_NE(-1,
(g_sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)));
expo = INITIAL_CONNECT_TIMEOUT;
deadline = timespec_add(timespec_real(),
timespec_fromseconds(MAX_WAIT_CONNECT_SECONDS));
LOGIFNEG1(sigaction(SIGALRM, &(struct sigaction){.sa_handler = OnAlarm}, 0));
DEBUGF("connecting to %s (%hhu.%hhu.%hhu.%hhu) to run %s", g_hostname, ip4[0],
ip4[1], ip4[2], ip4[3], g_prog);
struct timespec start = timespec_real();
TryAgain:
alarmed = false;
LOGIFNEG1(setitimer(
ITIMER_REAL,
&(const struct itimerval){{0, 0}, {expo / 1000000, expo % 1000000}},
NULL));
rc = connect(g_sock, ai->ai_addr, ai->ai_addrlen);
err = errno;
if (rc == -1) {
if (err == EINTR) {
expo *= 1.5;
if (timespec_cmp(timespec_real(), deadline) >= 0) {
FATALF("timeout connecting to %s (%hhu.%hhu.%hhu.%hhu:%d)", g_hostname,
ip4[0], ip4[1], ip4[2], ip4[3],
ntohs(((struct sockaddr_in *)ai->ai_addr)->sin_port));
__builtin_unreachable();
}
goto TryAgain;
}
FATALF("%s(%s:%hu): %s", "connect", g_hostname, g_runitdport,
strerror(err));
} else {
DEBUGF("connected to %s", g_hostname);
}
setitimer(ITIMER_REAL, &(const struct itimerval){0}, 0);
freeaddrinfo(ai);
connect_latency = timespec_tomicros(timespec_sub(timespec_real(), start));
}
bool Send(int tmpfd, const void *output, size_t outputsize) {
bool ok;
char *zbuf;
size_t zsize;
int rc, have;
static bool once;
static z_stream zs;
zsize = 32768;
if (!(zbuf = malloc(zsize)))
__builtin_trap();
if (!once) {
CHECK_EQ(Z_OK, deflateInit2(&zs, 4, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
Z_DEFAULT_STRATEGY));
once = true;
}
zs.next_in = output;
zs.avail_in = outputsize;
ok = true;
do {
zs.avail_out = zsize;
zs.next_out = (unsigned char *)zbuf;
rc = deflate(&zs, Z_SYNC_FLUSH);
CHECK_NE(Z_STREAM_ERROR, rc);
have = zsize - zs.avail_out;
rc = write(tmpfd, zbuf, have);
if (rc != have) {
DEBUGF("write(%d, %d) → %d", tmpfd, have, rc);
ok = false;
break;
}
} while (!zs.avail_out);
free(zbuf);
return ok;
}
bool SendRequest(int tmpfd) {
int fd;
char *p;
bool okall;
uint32_t crc;
struct stat st;
const char *name;
unsigned char *hdr, *q;
size_t progsize, namesize, hdrsize;
CHECK_NE(-1, (fd = open(g_prog, O_RDONLY)));
CHECK_NE(-1, fstat(fd, &st));
CHECK_NE(MAP_FAILED, (p = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)));
CHECK_LE((namesize = strlen((name = basename(g_prog)))), PATH_MAX);
CHECK_LE((progsize = st.st_size), INT_MAX);
CHECK_NOTNULL((hdr = gc(calloc(1, (hdrsize = 17 + namesize)))));
crc = crc32_z(0, (unsigned char *)p, st.st_size);
q = hdr;
q = WRITE32BE(q, RUNITD_MAGIC);
*q++ = kRunitExecute;
q = WRITE32BE(q, namesize);
q = WRITE32BE(q, progsize);
q = WRITE32BE(q, crc);
q = mempcpy(q, name, namesize);
assert(hdrsize == q - hdr);
okall = true;
okall &= Send(tmpfd, hdr, hdrsize);
okall &= Send(tmpfd, p, progsize);
CHECK_NE(-1, munmap(p, st.st_size));
CHECK_NE(-1, close(fd));
return okall;
}
void RelayRequest(void) {
int i, rc, have, transferred;
char *buf = gc(malloc(PIPE_BUF));
for (transferred = 0;;) {
rc = read(13, buf, PIPE_BUF);
CHECK_NE(-1, rc);
have = rc;
if (!rc)
break;
transferred += have;
for (i = 0; i < have; i += rc) {
rc = mbedtls_ssl_write(&ezssl, buf + i, have - i);
if (rc <= 0) {
EzTlsDie("relay request failed", rc);
}
}
}
CHECK_NE(0, transferred);
rc = EzTlsFlush(&ezbio, 0, 0);
if (rc < 0) {
EzTlsDie("relay request failed to flush", rc);
}
close(13);
}
bool Recv(char *p, int n) {
int i, rc;
for (i = 0; i < n; i += rc) {
do
rc = mbedtls_ssl_read(&ezssl, p + i, n - i);
while (rc == MBEDTLS_ERR_SSL_WANT_READ);
if (!rc)
return false;
if (rc < 0) {
if (rc == MBEDTLS_ERR_NET_CONN_RESET) {
EzTlsDie("connection reset", rc);
} else {
EzTlsDie("read response failed", rc);
}
}
}
return true;
}
int ReadResponse(void) {
int exitcode;
struct timespec start = timespec_real();
for (;;) {
char msg[5];
if (!Recv(msg, 5)) {
WARNF("%s didn't report status of %s", g_hostname, g_prog);
exitcode = 200;
break;
}
if (READ32BE(msg) != RUNITD_MAGIC) {
WARNF("%s sent corrupted data stream after running %s", g_hostname,
g_prog);
exitcode = 201;
break;
}
if (msg[4] == kRunitExit) {
if (!Recv(msg, 1)) {
TruncatedMessage:
WARNF("%s sent truncated message running %s", g_hostname, g_prog);
exitcode = 202;
break;
}
exitcode = *msg & 255;
if (exitcode) {
WARNF("%s says %s exited with %d", g_hostname, g_prog, exitcode);
} else {
VERBOSEF("%s says %s exited with %d", g_hostname, g_prog, exitcode);
}
mbedtls_ssl_close_notify(&ezssl);
break;
} else if (msg[4] == kRunitStdout || msg[4] == kRunitStderr) {
if (!Recv(msg, 4))
goto TruncatedMessage;
int n = READ32BE(msg);
char *s = malloc(n);
if (!Recv(s, n))
goto TruncatedMessage;
write(2, s, n);
free(s);
} else {
WARNF("%s sent message with unknown command %d after running %s",
g_hostname, msg[4], g_prog);
exitcode = 203;
break;
}
}
execute_latency = timespec_tomicros(timespec_sub(timespec_real(), start));
close(g_sock);
return exitcode;
}
int RunOnHost(char *spec) {
int err;
char *p;
for (p = spec; *p; ++p) {
if (*p == ':')
*p = ' ';
}
int got =
sscanf(spec, "%100s %hu %hu", g_hostname, &g_runitdport, &g_sshport);
if (got < 1) {
kprintf("what on earth %#s -> %d\n", spec, got);
fprintf(stderr, "what on earth %#s -> %d\n", spec, got);
exit(1);
}
if (!strchr(g_hostname, '.'))
strcat(g_hostname, ".test.");
DEBUGF("connecting to %s port %d", g_hostname, g_runitdport);
for (;;) {
Connect();
EzFd(g_sock);
struct timespec start = timespec_real();
err = EzHandshake2();
handshake_latency = timespec_tomicros(timespec_sub(timespec_real(), start));
if (!err)
break;
WARNF("handshake with %s:%d failed -0x%04x (%s)", //
g_hostname, g_runitdport, err, GetTlsError(err));
close(g_sock);
return 1;
}
RelayRequest();
int rc = ReadResponse();
kprintf("%s on %-16s %'8ld µs %'8ld µs %'11d µs\n", basename(g_prog),
g_hostname, connect_latency, handshake_latency, execute_latency);
return rc;
}
bool IsParallelBuild(void) {
const char *makeflags;
return (makeflags = getenv("MAKEFLAGS")) && strstr(makeflags, "-j");
}
bool ShouldRunInParallel(void) {
return !IsWindows() && IsParallelBuild();
}
int SpawnSubprocesses(int argc, char *argv[]) {
sigset_t chldmask, savemask;
int i, ws, pid, *pids, exitcode;
struct sigaction ignore, saveint, savequit;
char *args[5] = {argv[0], argv[1], argv[2]};
// create compressed network request ahead of time
const char *tmpdir = firstnonnull(getenv("TMPDIR"), "/tmp");
char *tpath = gc(xasprintf("%s/runit.XXXXXX", tmpdir));
int tmpfd = mkstemp(tpath);
CHECK_NE(-1, tmpfd);
CHECK(SendRequest(tmpfd));
CHECK_NE(-1, close(tmpfd));
// fork off 𝑛 subprocesses for each host on which we run binary.
// what's important here is htop in tree mode will report like:
//
// runit xnu freebsd netbsd
// ├─runit xnu
// ├─runit freebsd
// └─runit netbsd
//
// That way when one hangs, it's easy to know what o/s it is.
argc -= 3;
argv += 3;
exitcode = 0;
pids = calloc(argc, sizeof(int));
ignore.sa_flags = 0;
ignore.sa_handler = SIG_IGN;
sigemptyset(&ignore.sa_mask);
sigaction(SIGINT, &ignore, &saveint);
sigaction(SIGQUIT, &ignore, &savequit);
sigemptyset(&chldmask);
sigaddset(&chldmask, SIGCHLD);
sigprocmask(SIG_BLOCK, &chldmask, &savemask);
for (i = 0; i < argc; ++i) {
args[3] = argv[i];
CHECK_NE(-1, (pids[i] = vfork()));
if (!pids[i]) {
dup2(open(tpath, O_RDONLY | O_CLOEXEC), 13);
sigaction(SIGINT, &(struct sigaction){0}, 0);
sigaction(SIGQUIT, &(struct sigaction){0}, 0);
sigprocmask(SIG_SETMASK, &savemask, 0);
execve(args[0], args, environ); // for htop
_Exit(127);
}
}
// wait for children to terminate
for (;;) {
if ((pid = wait(&ws)) == -1) {
if (errno == EINTR)
continue;
if (errno == ECHILD)
break;
FATALF("wait failed");
}
for (i = 0; i < argc; ++i) {
if (pids[i] != pid)
continue;
if (WIFEXITED(ws)) {
if (WEXITSTATUS(ws)) {
INFOF("%s exited with %d", argv[i], WEXITSTATUS(ws));
} else {
DEBUGF("%s exited with %d", argv[i], WEXITSTATUS(ws));
}
if (!exitcode)
exitcode = WEXITSTATUS(ws);
} else {
INFOF("%s terminated with %s", argv[i], strsignal(WTERMSIG(ws)));
if (!exitcode)
exitcode = 128 + WTERMSIG(ws);
}
break;
}
}
unlink(tpath);
sigprocmask(SIG_SETMASK, &savemask, 0);
sigaction(SIGQUIT, &savequit, 0);
sigaction(SIGINT, &saveint, 0);
free(pids);
return exitcode;
}
int main(int argc, char *argv[]) {
ShowCrashReports();
signal(SIGPIPE, SIG_IGN);
// mbedtls_debug_threshold = 3;
if (getenv("DEBUG")) {
__log_level = kLogDebug;
}
if (argc > 1 &&
(strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0)) {
ShowUsage(stdout, 0);
__builtin_unreachable();
}
if (argc < 3) {
ShowUsage(stderr, EX_USAGE);
__builtin_unreachable();
}
CheckExists((g_runitd = argv[1]));
CheckExists((g_prog = argv[2]));
if (argc == 3) {
/* hosts list empty */
return 0;
} else if (argc == 4) {
/* TODO(jart): this is broken */
/* single host */
SetupPresharedKeySsl(MBEDTLS_SSL_IS_CLIENT, GetRunitPsk());
g_sshport = 22;
g_runitdport = RUNITD_PORT;
return RunOnHost(argv[3]);
} else {
/* multiple hosts */
return SpawnSubprocesses(argc, argv);
}
}