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// SPDX-License-Identifier: AGPL-3.0-or-later
/* SEITAN - Syscall Expressive Interpreter, Transformer and Notifier
*
* build.c - Build BPF program and transformation table blobs
*
* Copyright (c) 2022 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/audit.h>
#include <linux/filter.h>
#include <linux/seccomp.h>
struct syscall_numbers {
char name[1024];
long number;
};
enum transform {
NONE,
FD1_UNIX,
FDRET_SRC,
DEV_CHECK,
};
#include "filter.h"
#include "numbers.h"
struct table {
enum transform type;
long number;
char arg[6][1024];
};
static struct table t[16];
int main(void)
{
struct table *tp = t;
char buf[BUFSIZ];
FILE *fp;
int fd;
fd = open(BUILD_BPF_OUT, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
S_IRUSR | S_IWUSR);
write(fd, BUILD_PROFILE, sizeof(BUILD_PROFILE));
close(fd);
fp = fopen(BUILD_IN, "r");
while (fgets(buf, BUFSIZ, fp)) {
char name[1024];
char type[1024];
unsigned i;
if (*buf == '\n' || *buf == '#')
continue;
if (sscanf(buf, "%s %s " /* syscall, type */
"%s %s %s %s %s %s", name, type,
tp->arg[0], tp->arg[1], tp->arg[2],
tp->arg[3], tp->arg[4], tp->arg[5]) < 3)
continue;
for (i = 0; i < sizeof(numbers) / sizeof(numbers[0]); i++) {
if (!strcmp(name, numbers[i].name))
break;
}
if (i == sizeof(numbers))
continue;
if (!strcmp(type, "fd1_unix"))
tp->type = 1;
else if (!strcmp(type, "fdret_src"))
tp->type = 2;
else if (!strcmp(type, "dev_check"))
tp->type = 3;
else
continue;
tp->number = numbers[i].number;
tp++;
}
fclose(fp);
fd = open(BUILD_TRANSFORM_OUT,
O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, S_IRUSR | S_IWUSR);
write(fd, t, sizeof(t));
close(fd);
return 0;
}
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