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quark-test.c
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// SPDX-License-Identifier: Apache-2.0
/* Copyright (c) 2024 Elastic NV */
#include <sys/mman.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <assert.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <ifaddrs.h>
#include <limits.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>
#include "quark.h"
/* For bypass tests */
#include "elastic-ebpf/GPL/Events/EbpfEventProto.h"
#define MAN_QUARK_TEST
#include "manpages.h"
#define PATTERN "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
struct udphdr {
u16 source;
u16 dest;
u16 len;
u16 check;
};
#define msleep(_x) usleep((uint64_t)_x * 1000ULL)
enum {
SANE,
RED,
GREEN,
YELLOW
};
static int bflag; /* run bpf tests */
static int kflag; /* run kprobe tests */
static int
fancy_tty(void)
{
char *term = getenv("TERM");
if (term == NULL || !strcmp(term, "dumb"))
return (0);
return (isatty(STDOUT_FILENO) == 1);
}
static int
color(int color)
{
static int old;
int ret;
if (!fancy_tty())
return (SANE);
ret = old;
switch (color) {
case SANE:
printf("\033[0m");
break;
case RED:
printf("\033[31m");
break;
case GREEN:
printf("\033[32m");
break;
case YELLOW:
printf("\033[33m");
break;
default:
errx(1, "bad color %d", color);
}
old = color;
return (ret);
}
static char *
binpath(void)
{
static char name[PATH_MAX];
if (readlink("/proc/self/exe", name, sizeof(name)) == -1)
err(1, "readlink");
return name;
}
static int
backend_of_attr(struct quark_queue_attr *qa)
{
int be;
if (((qa->flags & QQ_ALL_BACKENDS) == QQ_ALL_BACKENDS))
errx(1, "backend must be explicit");
else if (qa->flags & QQ_EBPF)
be = QQ_EBPF;
else if (qa->flags & QQ_KPROBE)
be = QQ_KPROBE;
else
errx(1, "bad flags");
return (be);
}
static void
spin(void)
{
static int ch;
if (!fancy_tty())
return;
/* -\|/ */
switch (ch) {
case 0: /* FALLTHROUGH */
case '-':
ch = '\\';
break;
case '\\':
ch = '|';
break;
case '|':
ch = '/';
break;
case '/':
ch = '-';
break;
default:
ch = '?';
}
printf("%c\b", ch);
fflush(stdout);
}
static u32
sproc_self_namespace(const char *path)
{
const char *errstr;
char buf[512], *start, *end;
ssize_t n;
u32 v;
int dfd;
if ((dfd = open("/proc/self", O_PATH)) == -1)
err(1, "open /proc/self");
n = qreadlinkat(dfd, path, buf, sizeof(buf));
close(dfd);
if (n == -1)
err(1, "qreadlinkat %s", path);
else if (n >= (ssize_t)sizeof(buf))
errx(1, "qreadlinkat %s truncation", path);
if ((start = strchr(buf, '[')) == NULL)
errx(1, "no [");
if ((end = strchr(buf, ']')) == NULL)
errx(1, "no ]");
start++;
*end = 0;
v = strtonum(start, 0, UINT32_MAX, &errstr);
if (errstr != NULL)
errx(1, "strtonum %s: %s", start, errstr);
return (v);
}
static int
num_open_fd(void)
{
DIR *dirp;
struct dirent *d;
int n;
if ((dirp = opendir("/proc/self/fd")) == NULL)
err(1, "opendir");
for (n = 0; (d = readdir(dirp)) != NULL;) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
n++;
}
/* Has to be at least one, since opendir does open */
assert(n >= 1);
closedir(dirp);
/* Discount the FD from dirp */
return (n - 1);
}
static void
dump_open_fd(FILE *f)
{
int dfd;
DIR *dirp;
struct dirent *d;
ssize_t n;
char self[512], buf[512];
if ((dfd = open("/proc/self/fd", O_DIRECTORY)) == -1)
err(1, "open /proc/self/fd");
if ((dirp = fdopendir(dfd)) == NULL)
err(1, "fdopendir");
snprintf(self, sizeof(self), "/proc/%d/fd", getpid());
for (n = 0; (d = readdir(dirp)) != NULL;) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
n = qreadlinkat(dfd, d->d_name, buf, sizeof(buf));
if (n == -1)
err(1, "qreadlinkat");
if (!strcmp(buf, self))
continue;
fprintf(f, "%s -> %s\n", d->d_name, buf);
}
closedir(dirp); /* closes dfd */
fflush(f);
}
struct test {
char *name;
int (*func)(const struct test *, struct quark_queue_attr *);
int backend;
};
static void
display_version(void)
{
printf("%s-%s\n", program_invocation_short_name, QUARK_VERSION);
printf("License: Apache-2.0\n");
printf("Copyright (c) 2024 Elastic NV\n");
exit(0);
}
static void
usage(void)
{
fprintf(stderr, "usage: %s -h\n",
program_invocation_short_name);
fprintf(stderr, "usage: %s [-bkv] [tests ...]\n",
program_invocation_short_name);
fprintf(stderr, "usage: %s -l\n",
program_invocation_short_name);
fprintf(stderr, "usage: %s -N\n",
program_invocation_short_name);
fprintf(stderr, "usage: %s -V\n",
program_invocation_short_name);
exit(1);
}
static pid_t
fork_exec_nop(void)
{
pid_t child;
int status;
char *const argv[] = {
binpath(),
"-N",
"this",
"is",
"nop!",
NULL
};
if ((child = fork()) == -1)
err(1, "fork");
else if (child == 0) {
/* child */
return (execv(binpath(), argv));
}
/* parent */
if (waitpid(child, &status, 0) == -1)
err(1, "waitpid");
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
errx(1, "child didn't exit cleanly");
return (child);
}
static int
clone_start(void *nada)
{
_exit(0);
/* NOTREACHED */
return (0);
}
#define STACK_SIZE (1024UL * 128UL)
static pid_t
fork_clone_and_exit(void)
{
int flags;
u8 *stack, *stack_start;
pid_t pid;
/*
* First we do a normal fork, in this new process we will clone a new
* thread and call exit.
*/
if ((pid = fork()) == -1)
err(1, "fork");
/* parent just returns */
if (pid != 0)
return (pid);
/* continue on child ... */
/*
* Set up a stack, clone() is like fork and we just give it a stack
* without a starting addr.
*/
stack = mmap(NULL, STACK_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
if (stack == MAP_FAILED)
err(1, "mmap");
stack_start = stack + STACK_SIZE;
flags =
CLONE_VM |
CLONE_FS |
CLONE_FILES |
CLONE_SIGHAND |
CLONE_THREAD |
CLONE_SYSVSEM;
/*
* clone the new thread, pid is tid
*/
pid = clone(clone_start, stack_start, flags, NULL);
if (pid == -1)
err(1, "clone3");
/* Wait for the clone thread to exit */
for (;;)
sleep(1);
/* NOTREACHED */
if (munmap(stack, STACK_SIZE) == -1)
err(1, "munmap");
return 0;
}
#undef STACK_SIZE
static const struct quark_event *
drain_for_pid(struct quark_queue *qq, pid_t pid)
{
const struct quark_event *qev;
struct timespec start, now;
qev = NULL;
if (clock_gettime(CLOCK_MONOTONIC, &start) == -1)
err(1, "clock_gettime");
now = start;
for (; ; (void)clock_gettime(CLOCK_MONOTONIC, &now)) {
if ((now.tv_sec - start.tv_sec) >= 5) {
errno = ETIME;
err(1, "drain_for_pid");
}
qev = quark_queue_get_event(qq);
if (qev == NULL) {
if (quark_queue_block(qq) == -1)
err(1, "quark_queue_block");
continue;
}
if (pid == -1)
break;
if (qev->process == NULL)
continue;
if (qev->process->pid != (u32)pid)
continue;
break;
}
return (qev);
}
static void
assert_localhost(void)
{
struct ifaddrs *ifa;
if (getifaddrs(&ifa) == -1)
err(1, "getifaddrs");
if (ifa == NULL)
errx(1, "getifaddrs: no addresses");
assert(!strcmp(ifa->ifa_name, "lo"));
assert(ifa->ifa_addr != NULL);
freeifaddrs(ifa);
}
static int
local_listen(u16 port, int type)
{
struct sockaddr_in sin;
int fd;
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = ntohs(port);
if (inet_aton("127.0.0.1", &sin.sin_addr) != 1)
errx(1, "inet_aton");
if ((fd = socket(sin.sin_family, type, 0)) == -1)
err(1, "socket");
if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) == -1)
err(1, "bind");
if (type == SOCK_STREAM && listen(fd, 32) == -1)
err(1, "listen");
return (fd);
}
static int
local_connect(u16 port, int type, u16 *bound_port)
{
struct sockaddr_in sin;
int fd;
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = ntohs(port);
if (inet_aton("127.0.0.1", &sin.sin_addr) != 1)
errx(1, "inet_aton");
if ((fd = socket(sin.sin_family, type, 0)) == -1)
err(1, "socket");
if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)) == -1)
err(1, "connect");
if (bound_port != NULL) {
socklen_t socklen;
socklen = sizeof(sin);
if (getsockname(fd, &sin, &socklen) == -1)
err(1, "getsockname");
*bound_port = sin.sin_port;
}
return (fd);
}
static pid_t
fork_sock_write(u16 port, int type, u16 *bound_port)
{
pid_t child;
int status, listen_fd, conn_fd;
ssize_t n;
int pipefd[2];
assert_localhost();
/*
* We do the connect in the child, we use a pipe to send the bound port
* up to us.
*/
if (bound_port != NULL && pipe(pipefd) == -1)
err(1, "pipe");
if ((child = fork()) == -1) {
err(1, "fork");
} else if (child == 0) { /* child */
listen_fd = local_listen(port, type);
conn_fd = local_connect(port, type, bound_port);
n = qwrite(conn_fd, PATTERN, strlen(PATTERN));
if (n == -1)
err(1, "qwrite");
close(listen_fd);
close(conn_fd);
if (bound_port != NULL) {
close(pipefd[0]);
n = qwrite(pipefd[1], bound_port, sizeof(*bound_port));
if (n == -1)
err(1, "qwrite");
close(pipefd[1]);
}
exit(0);
}
/* parent */
if (waitpid(child, &status, 0) == -1)
err(1, "waitpid");
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
errx(1, "child didn't exit cleanly");
if (bound_port != NULL) {
close(pipefd[1]);
n = qread(pipefd[0], bound_port, sizeof(*bound_port));
if (n == -1)
err(1, "qread");
else if (n == 0)
err(1, "qread unexpected eof");
else if (n != sizeof(*bound_port))
errx(1, "qread short buf");
close(pipefd[0]);
}
return (child);
}
static int
t_probe(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
if (quark_queue_open(&qq, qa) != 0)
err(1, "%s: quark_queue_open", t->name);
quark_queue_close(&qq);
return (0);
}
static int
t_fork_exec_exit(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_event *qev;
const struct quark_process *qp;
pid_t child;
struct args *args;
size_t expected_len;
int i;
char cwd[PATH_MAX];
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
child = fork_exec_nop();
qev = drain_for_pid(&qq, child);
/* check qev.events */
assert(qev->events & QUARK_EV_FORK);
assert(qev->events & QUARK_EV_EXEC);
assert(qev->events & QUARK_EV_EXIT);
/* check qev.process */
qp = qev->process;
assert(qp != NULL);
assert(qp->flags & QUARK_F_EXIT);
assert(qp->flags & QUARK_F_COMM);
assert(qp->flags & QUARK_F_FILENAME);
assert(qp->flags & QUARK_F_CMDLINE);
assert(qp->flags & QUARK_F_CWD);
assert((pid_t)qp->pid == child);
assert((pid_t)qp->proc_ppid == getpid());
assert(qp->proc_time_boot > 0); /* XXX: improve */
assert(qp->proc_uid == getuid());
assert(qp->proc_gid == getgid());
assert(qp->proc_suid == geteuid());
assert(qp->proc_sgid == getegid());
assert(qp->proc_euid == geteuid());
assert(qp->proc_egid == getegid());
assert((pid_t)qp->proc_pgid == getpgid(0));
assert((pid_t)qp->proc_sid == getsid(0));
/* check capabilities */
/* XXX: assumes too much */
/* Newer kernels default to 0x800000000 */
assert(qp->proc_cap_inheritable == 0 ||
qp->proc_cap_inheritable == 0x800000000);
/*
* We don't know the exact set since it varies from kernel,
* improve this in the future.
*/
assert(qp->proc_cap_effective != 0);
assert(qp->proc_cap_permitted != 0);
/* check entry leader */
/*
* XXX TODO This depends how we're running the test, if we're over ssh
* it will show ssh, if not it will show init and whatnot, for now
* assert that it is not unknown at least.
*/
assert(qp->proc_entry_leader != 0);
assert(qp->proc_entry_leader_type != QUARK_ELT_UNKNOWN);
/* XXX TODO check tty_major and tty_minor for self in the future */
#if 0
assert(qp->proc_tty_major != QUARK_TTY_UNKNOWN);
assert(qp->proc_tty_minor != 0);
#endif
/* check strings */
assert(!strcmp(qp->comm, program_invocation_short_name));
assert(!strcmp(qp->filename, binpath()));
/* check args */
args = args_make(qp);
assert(args != NULL);
assert(args->argc == 5);
assert(!strcmp(args->argv[0], binpath()));
assert(!strcmp(args->argv[1], "-N"));
assert(!strcmp(args->argv[2], "this"));
assert(!strcmp(args->argv[3], "is"));
assert(!strcmp(args->argv[4], "nop!"));
/*
* Expected len is the length of the arguments summed up, plus one byte
* for each argument(the NUL after each argument, including the last
* one), so we just start at 'argc' bytes.
*/
for (expected_len = args->argc, i = 0; i < args->argc; i++)
expected_len += strlen(args->argv[i]);
args_free(args);
assert(qp->cmdline_len == expected_len);
if (getcwd(cwd, sizeof(cwd)) == NULL)
err(1, "getcwd");
assert(!strcmp(cwd, qp->cwd));
quark_queue_close(&qq);
return (0);
}
/* Make sure an exit comes from tgid, not tid */
static int
t_exit_tgid(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_event *qev;
pid_t pid;
int i;
/* More aggressive since we loop */
qa->hold_time = 10;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
/*
* The actual tid is not reliable, sometimes an EBPF event would come
* with tid==tgid, so try it a few times
*/
for (i = 0; i < 20; i++) {
pid = fork_clone_and_exit();
qev = drain_for_pid(&qq, pid);
assert(qev->process != NULL);
assert(qev->events & QUARK_EV_FORK);
assert(qev->events & QUARK_EV_EXIT);
}
quark_queue_close(&qq);
return (0);
}
static int
t_bypass(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_event *qev;
struct timespec start, now;
u64 wanted;
const struct ebpf_event_header *eh;
qa->flags &= ~QQ_ENTRY_LEADER;
qa->flags |= QQ_BYPASS;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
(void)fork_exec_nop();
wanted =
EBPF_EVENT_PROCESS_FORK |
EBPF_EVENT_PROCESS_EXEC |
EBPF_EVENT_PROCESS_EXIT;
if (clock_gettime(CLOCK_MONOTONIC, &start) == -1)
err(1, "clock_gettime");
for (now = start; wanted != 0; (void)clock_gettime(CLOCK_MONOTONIC, &now)) {
if ((now.tv_sec - start.tv_sec) >= 5) {
errno = ETIME;
err(1, "bypass");
}
qev = drain_for_pid(&qq, -1);
assert(qev->events == QUARK_EV_BYPASS);
assert(qev->bypass != NULL);
eh = qev->bypass;
wanted &= ~eh->type;
}
quark_queue_close(&qq);
return (0);
}
static int
t_sock_conn(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_event *qev;
pid_t child;
u16 bound_port;
qa->flags |= QQ_SOCK_CONN;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
child = fork_sock_write(18888, SOCK_STREAM, &bound_port);
/* QUARK_EV_FORK */
qev = drain_for_pid(&qq, child);
assert(qev->events == QUARK_EV_FORK);
/* SOCK_CONN_ESTABLISHED */
qev = drain_for_pid(&qq, child);
assert(qev->events == QUARK_EV_SOCK_CONN_ESTABLISHED);
assert(qev->process != NULL);
assert((pid_t)qev->process->pid == child);
assert(qev->socket != NULL);
assert(qev->socket->established_time > 0);
assert(qev->socket->from_scrape == 0);
assert((pid_t)qev->socket->pid_origin == child);
assert((pid_t)qev->socket->pid_last_use == child);
assert(qev->socket->local.af == AF_INET);
assert(qev->socket->local.addr4 == htonl(INADDR_LOOPBACK));
assert(qev->socket->local.port == bound_port);
assert(qev->socket->remote.af == AF_INET);
assert(qev->socket->remote.addr4 == htonl(INADDR_LOOPBACK));
assert(qev->socket->remote.port == htons(18888));
assert(qev->socket->close_time == 0);
/* SOCK_CONN_CLOSED */
qev = drain_for_pid(&qq, child);
assert(qev->events == QUARK_EV_SOCK_CONN_CLOSED);
assert(qev->process != NULL);
assert((pid_t)qev->process->pid == child);
assert(qev->socket != NULL);
assert(qev->socket->established_time > 0);
assert(qev->socket->from_scrape == 0);
assert((pid_t)qev->socket->pid_origin == child);
assert((pid_t)qev->socket->pid_last_use == child);
assert(qev->socket->local.af == AF_INET);
assert(qev->socket->local.addr4 == htonl(INADDR_LOOPBACK));
assert(qev->socket->local.port == bound_port);
assert(qev->socket->remote.af == AF_INET);
assert(qev->socket->remote.addr4 == htonl(INADDR_LOOPBACK));
assert(qev->socket->remote.port == htons(18888));
assert(qev->socket->close_time > 0);
/* QUARK_EV_EXIT */
qev = drain_for_pid(&qq, child);
assert(qev->events == QUARK_EV_EXIT);
quark_queue_close(&qq);
return (0);
}
static int
t_namespace(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_event *qev;
pid_t child;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
child = fork_exec_nop();
qev = drain_for_pid(&qq, child);
assert(qev->process != NULL);
assert(qev->process->proc_uts_inonum == sproc_self_namespace("ns/uts"));
assert(qev->process->proc_ipc_inonum == sproc_self_namespace("ns/ipc"));
assert(qev->process->proc_mnt_inonum == sproc_self_namespace("ns/mnt"));
assert(qev->process->proc_net_inonum == sproc_self_namespace("ns/net"));
quark_queue_close(&qq);
return (0);
}
static int
t_cache_grace(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_process *qp;
pid_t child;
/*
* Default grace time would slow down this test too much
*/
qa->cache_grace_time = 100;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
/*
* Check that we ourselves exist before getting events, meaning we came
* from /proc scraping
*/
qp = quark_process_lookup(&qq, getpid());
assert(qp != NULL);
assert((pid_t)qp->pid == getpid());
/*
* Fork a child, drain until we see it.
*/
child = fork_exec_nop();
(void)drain_for_pid(&qq, child);
/* Must be in cache now */
qp = quark_process_lookup(&qq, child);
assert(qp != NULL);
assert((pid_t)qp->pid == child);
/*
* Wait the configured cache_grace_time, run a dummy get_event to
* trigger the removal, ensure child is gone.
*/
msleep(qa->cache_grace_time);
(void)quark_queue_get_event(&qq);
assert(quark_process_lookup(&qq, child) == NULL);
quark_queue_close(&qq);
return (0);
}
static int
t_min_agg(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_event *qev;
const struct quark_process *qp;
pid_t child;
qa->flags |= QQ_MIN_AGG;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
/*
* Fork a child, since there is no aggregation, we should see 3 events
* for the same pid: FORK + EXEC + EXIT.
*/
child = fork_exec_nop();
/* Fork */
qev = drain_for_pid(&qq, child);
assert(qev->events & QUARK_EV_FORK);
assert(!(qev->events & (QUARK_EV_EXEC|QUARK_EV_EXIT)));
qp = qev->process;
assert(qp != NULL);
assert((pid_t)qp->pid == child);
assert(qp->flags & QUARK_F_PROC);
/* Exec */
qev = drain_for_pid(&qq, child);
assert(qev->events & QUARK_EV_EXEC);
assert(!(qev->events & (QUARK_EV_FORK|QUARK_EV_EXIT)));
assert((pid_t)qp->pid == child);
/* Exit */
qev = drain_for_pid(&qq, child);
assert(qev->events & QUARK_EV_EXIT);
assert(!(qev->events & (QUARK_EV_FORK|QUARK_EV_EXEC)));
qp = qev->process;
assert(qp != NULL);
assert((pid_t)qp->pid == child);
assert(qp->flags & QUARK_F_EXIT);
assert(qp->exit_code == 0);
assert(qp->exit_time_event > 0);
quark_queue_close(&qq);
return (0);
}
static int
t_stats(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
pid_t child;
struct quark_queue_stats old_stats, stats;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
quark_queue_get_stats(&qq, &old_stats);
assert(old_stats.backend == backend_of_attr(qa));
assert(old_stats.insertions == 0);
assert(old_stats.removals == 0);
assert(old_stats.aggregations == 0);
assert(old_stats.non_aggregations == 0);
assert(old_stats.lost == 0);
/*
* Fork a child, drain until we see it.
*/
child = fork_exec_nop();
(void)drain_for_pid(&qq, child);
/*
* Stats must have bumped now
*/
quark_queue_get_stats(&qq, &stats);
assert(stats.backend == old_stats.backend);
assert(stats.insertions > old_stats.insertions);
assert(stats.removals > old_stats.removals);
assert(stats.aggregations > old_stats.aggregations);
/* Can't state anything about non_aggregations */
/* If we're losing here, all hope is lost */
assert(old_stats.lost == 0);
/* XXX We should trigger lost events and ensure here XXX */
quark_queue_close(&qq);
return (0);
}
static int
t_dns(const struct test *t, struct quark_queue_attr *qa)
{
struct quark_queue qq;
const struct quark_event *qev;
struct quark_packet *packet;
pid_t child;
struct iphdr ip;
struct udphdr udp;
u16 bound_port;
assert_localhost();
qa->flags |= QQ_DNS;
if (quark_queue_open(&qq, qa) != 0)
err(1, "quark_queue_open");
child = fork_sock_write(53, SOCK_DGRAM, &bound_port);
/* first is the fork, no agg */
qev = drain_for_pid(&qq, child);
assert(qev->packet == NULL);
/* egress */
qev = drain_for_pid(&qq, child);
packet = qev->packet;
assert(packet != NULL);
assert(packet->cap_len == 90);
assert(packet->orig_len == 90);
/* ip */
memcpy(&ip, packet->data, sizeof(ip));
assert(ip.protocol == IPPROTO_UDP);
assert(ip.saddr == htonl(INADDR_LOOPBACK));
assert(ip.daddr == htonl(INADDR_LOOPBACK));
/* udp */
memcpy(&udp, packet->data + sizeof(ip), sizeof(udp));
assert(udp.dest == htons(53));
assert(udp.source == bound_port);
/* dns */
assert(!memcmp(packet->data + 28, PATTERN, packet->cap_len - 28));
/* ingress */
qev = drain_for_pid(&qq, child);
packet = qev->packet;
assert(packet != NULL);
assert(packet->cap_len == 90);
assert(packet->orig_len == 90);
/* ip */
memcpy(&ip, packet->data, sizeof(ip));
assert(ip.protocol == IPPROTO_UDP);
assert(ip.saddr == htonl(INADDR_LOOPBACK));
assert(ip.daddr == htonl(INADDR_LOOPBACK));
/* udp */
memcpy(&udp, packet->data + sizeof(ip), sizeof(udp));
assert(udp.dest == htons(53));
assert(udp.source == bound_port);
/* dns */
assert(!memcmp(packet->data + 28, PATTERN, packet->cap_len - 28));
quark_queue_close(&qq);
return (0);
}