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/* Copyright (c) 2017 Facebook
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/bpf.h>
#include <bpf/bpf.h>
#include "bpf_load.h"
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/unistd.h>
static void usage(char *pname)
{
printf("USAGE:\n %s [-l] <cg-path> <prog filename>\n", pname);
printf("\tLoad and attach a sock_ops program to the specified "
"cgroup\n");
printf("\tIf \"-l\" is used, the program will continue to run\n");
printf("\tprinting the BPF log buffer\n");
printf("\tIf the specified filename does not end in \".o\", it\n");
printf("\tappends \"_kern.o\" to the name\n");
printf("\n");
printf(" %s -r <cg-path>\n", pname);
printf("\tDetaches the currently attached sock_ops program\n");
printf("\tfrom the specified cgroup\n");
printf("\n");
exit(1);
}
int main(int argc, char **argv)
{
int logFlag = 0;
int error = 0;
char *cg_path;
char fn[500];
char *prog;
int cg_fd;
if (argc < 3)
usage(argv[0]);
if (!strcmp(argv[1], "-r")) {
cg_path = argv[2];
cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
error = bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
if (error) {
printf("ERROR: bpf_prog_detach: %d (%s)\n",
error, strerror(errno));
return 2;
}
return 0;
} else if (!strcmp(argv[1], "-h")) {
usage(argv[0]);
} else if (!strcmp(argv[1], "-l")) {
logFlag = 1;
if (argc < 4)
usage(argv[0]);
}
prog = argv[argc - 1];
cg_path = argv[argc - 2];
if (strlen(prog) > 480) {
fprintf(stderr, "ERROR: program name too long (> 480 chars)\n");
return 3;
}
cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
if (!strcmp(prog + strlen(prog)-2, ".o"))
strcpy(fn, prog);
else
sprintf(fn, "%s_kern.o", prog);
if (logFlag)
printf("loading bpf file:%s\n", fn);
if (load_bpf_file(fn)) {
printf("ERROR: load_bpf_file failed for: %s\n", fn);
printf("%s", bpf_log_buf);
return 4;
}
if (logFlag)
printf("TCP BPF Loaded %s\n", fn);
error = bpf_prog_attach(prog_fd[0], cg_fd, BPF_CGROUP_SOCK_OPS, 0);
if (error) {
printf("ERROR: bpf_prog_attach: %d (%s)\n",
error, strerror(errno));
return 5;
} else if (logFlag) {
read_trace_pipe();
}
return error;
}
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