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| | // SPDX-License-Identifier: GPL-2.0-or-later
/* PESTO - Programmable Extensible Socket Translation Orchestrator
* front-end for passt(1) and pasta(1) forwarding configuration
*
* pesto.c - Main program (it's not actually extensible)
*
* Copyright (c) 2026 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#include <arpa/inet.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <getopt.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/filter.h>
#include <linux/seccomp.h>
#include "common.h"
#include "seccomp_pesto.h"
#include "serialise.h"
#include "pesto.h"
#define die(...) \
do { \
FPRINTF(stderr, __VA_ARGS__); \
FPRINTF(stderr, "\n"); \
exit(EXIT_FAILURE); \
} while (0)
#define debug(...) \
do { \
if (verbosity > 1) { \
FPRINTF(stderr, __VA_ARGS__); \
FPRINTF(stderr, "\n"); \
} \
} while (0)
/**
* usage() - Print usage, exit with given status code
* @name: Executable name
* @f: Stream to print usage info to
* @status: Status code for exit(2)
*/
static void usage(const char *name, FILE *f, int status)
{
FPRINTF(f, "Usage: %s [OPTION]... PATH\n", name);
FPRINTF(f,
"\n"
" -v, --verbose Be more verbose\n"
" -q, --quiet Be less verbose\n"
" -h, --help Display this help message and exit\n"
" --version Show version and exit\n");
exit(status);
}
/**
* main() - Entry point and whole program with loop
* @argc: Argument count
* @argv: Arguments: socket path, operation, port specifiers
*
* Return: 0 on success, won't return on failure
*
* #syscalls:pesto connect write close exit_group fstat brk
* #syscalls:pesto socket s390x:socketcall i686:socketcall
* #syscalls:pesto recvfrom recvmsg arm:recv ppc64le:recv
* #syscalls:pesto sendto sendmsg arm:send ppc64le:send
*/
int main(int argc, char **argv)
{
const struct option options[] = {
{"quiet", no_argument, NULL, 'q' },
{"verbose", no_argument, NULL, 'v' },
{"help", no_argument, NULL, 'h' },
{"version", no_argument, NULL, 1 },
{ 0 },
};
struct sockaddr_un a = { AF_UNIX, "" };
const char *optstring = "vh";
struct pesto_hello hello;
struct sock_fprog prog;
int optname, ret, s;
uint32_t s_version;
int verbosity = 1;
prog.len = (unsigned short)sizeof(filter_pesto) /
sizeof(filter_pesto[0]);
prog.filter = filter_pesto;
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) ||
prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog))
die("Failed to apply seccomp filter");
do {
optname = getopt_long(argc, argv, optstring, options, NULL);
switch (optname) {
case -1:
case 0:
break;
case 'h':
usage(argv[0], stdout, EXIT_SUCCESS);
break;
case 'q':
verbosity--;
break;
case 'v':
verbosity++;
break;
case 1:
FPRINTF(stdout, "pesto ");
FPRINTF(stdout, VERSION_BLOB);
exit(EXIT_SUCCESS);
default:
usage(argv[0], stderr, EXIT_FAILURE);
}
} while (optname != -1);
if (argc - optind != 1)
usage(argv[0], stderr, EXIT_FAILURE);
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
die("Failed to create AF_UNIX socket: %s", strerror(errno));
ret = snprintf(a.sun_path, sizeof(a.sun_path), "%s", argv[optind]);
if (ret <= 0 || ret >= (int)sizeof(a.sun_path))
die("Invalid socket path \"%s\"", argv[optind]);
ret = connect(s, (struct sockaddr *)&a, sizeof(a));
if (ret < 0) {
die("Failed to connect to %s: %s",
a.sun_path, strerror(errno));
}
debug("Connected to passt/pasta control socket");
ret = read_all_buf(s, &hello, sizeof(hello));
if (ret < 0)
die("Couldn't read server greeting: %s", strerror(errno));
if (memcmp(hello.magic, PESTO_SERVER_MAGIC, sizeof(hello.magic)))
die("Bad magic number from server");
s_version = ntohl(hello.version);
debug("Server protocol version: %"PRIu32, s_version);
if (s_version > PESTO_PROTOCOL_VERSION) {
die("Unknown server protocol version %"PRIu32" > %"PRIu32"\n",
s_version, PESTO_PROTOCOL_VERSION);
}
/* cppcheck-suppress knownConditionTrueFalse */
if (!s_version) {
if (PESTO_PROTOCOL_VERSION)
die("Unsupported experimental server protocol");
FPRINTF(stderr,
"Warning: Using experimental protocol version, client and server must match\n");
}
exit(0);
}
|