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/* extrace - trace exec() calls system-wide
*
* Requires CONFIG_CONNECTOR=y and CONFIG_PROC_EVENTS=y.
* Requires root or "setcap cap_net_admin+ep extrace".
*
* Usage: extrace [-f] [-w] [-o FILE] [-p PID|CMD...]
* default: show all exec(), globally
* -p PID only show exec() descendant of PID
* CMD... run CMD... and only show exec() descendant of it
* -o FILE log to FILE instead of standard output (implies -w)
* -w wide output: show full command line
* -f flat output: no indentation
*
* Copyright (C) 2014 Christian Neukirchen <chneukirchen@gmail.com>
*
* hacked from sources of:
*/
/* exec-notify, so you can watch your acrobat reader or vim executing "bash -c"
* commands ;-)
* Requires some 2.6.x Linux kernel with proc connector enabled.
*
* $ cc -Wall -ansi -pedantic -std=c99 exec-notify.c
*
* (C) 2007-2010 Sebastian Krahmer <krahmer@suse.de> original netlink handling
* stolen from an proc-connector example, copyright folows:
*/
/* Copyright (C) Matt Helsley, IBM Corp. 2005
* Derived from fcctl.c by Guillaume Thouvenin
* Original copyright notice follows:
*
* Copyright (C) 2005 BULL SA.
* Written by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _XOPEN_SOURCE 700
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <linux/connector.h>
#include <linux/netlink.h>
#include <linux/cn_proc.h>
#define max(x,y) ((y)<(x)?(x):(y))
#define min(x,y) ((y)>(x)?(x):(y))
#define SEND_MESSAGE_LEN (NLMSG_LENGTH(sizeof (struct cn_msg) + \
sizeof (enum proc_cn_mcast_op)))
#define RECV_MESSAGE_LEN (NLMSG_LENGTH(sizeof (struct cn_msg) + \
sizeof (struct proc_event)))
#define SEND_MESSAGE_SIZE (NLMSG_SPACE(SEND_MESSAGE_LEN))
#define RECV_MESSAGE_SIZE (NLMSG_SPACE(RECV_MESSAGE_LEN))
#define BUFF_SIZE (max(max(SEND_MESSAGE_SIZE, RECV_MESSAGE_SIZE), 1024))
#define MIN_RECV_SIZE (min(SEND_MESSAGE_SIZE, RECV_MESSAGE_SIZE))
#define CMDLINE_MAX 1024
pid_t parent = 1;
int width = 80;
int flat = 0;
int run = 0;
FILE *output;
sig_atomic_t quit = 0;
static int
pid_depth(pid_t pid)
{
pid_t ppid = 0;
FILE *f;
char name[PATH_MAX];
int d;
snprintf(name, sizeof name, "/proc/%d/stat", pid);
if ((f = fopen(name, "r"))) {
fscanf(f, "%*d (%*[^)]) %*c %d", &ppid);
fclose(f);
}
if (ppid == parent)
return 0;
if (ppid == 0)
return -1; /* a parent we are not interested in */
d = pid_depth(ppid);
if (d == -1)
return -1;
return d+1;
}
static void
sigint(int sig)
{
quit = 1;
}
static void
sigchld(int sig)
{
while (waitpid(-1, NULL, WNOHANG) > 0)
;
quit = 1;
}
static void
handle_msg(struct cn_msg *cn_hdr)
{
char cmdline[CMDLINE_MAX], name[PATH_MAX];
char buf[CMDLINE_MAX];
int r = 0, fd, i, d;
struct proc_event *ev = (struct proc_event *)cn_hdr->data;
if (ev->what == PROC_EVENT_EXEC) {
d = pid_depth(ev->event_data.exec.process_pid);
if (d < 0)
return;
snprintf(name, sizeof name, "/proc/%d/cmdline",
ev->event_data.exec.process_pid);
memset(&cmdline, 0, sizeof cmdline);
fd = open(name, O_RDONLY);
if (fd > 0) {
r = read(fd, cmdline, sizeof cmdline);
close(fd);
/* convert nuls (argument seperators) to spaces */
for (i = 0; r > 0 && i < r; i++)
if (cmdline[i] == 0)
cmdline[i] = ' ';
}
snprintf(buf, min(sizeof buf, width+1),
"%*s%d %s", flat ? 0 : 2*d, "",
ev->event_data.exec.process_pid,
cmdline);
fprintf(output, "%s\n", buf);
fflush(output);
}
}
int
main(int argc, char *argv[])
{
int sk_nl;
struct sockaddr_nl my_nla, kern_nla, from_nla;
socklen_t from_nla_len;
char buff[BUFF_SIZE];
struct nlmsghdr *nl_hdr, *nlh;
struct cn_msg *cn_hdr;
enum proc_cn_mcast_op *mcop_msg;
size_t recv_len = 0;
int rc = -1, opt;
if (getenv("COLUMNS"))
width = atoi(getenv("COLUMNS"));
if (width <= 0)
width = 80;
output = stdout;
while ((opt = getopt(argc, argv, "+fo:p:w")) != -1)
switch (opt) {
case 'f': flat = 1; break;
case 'p': parent = atoi(optarg); break;
case 'o':
output = fopen(optarg, "w");
if (!output) {
perror("fopen");
exit(1);
}
/* FALLTROUGH */
case 'w': width = CMDLINE_MAX; break;
default: goto usage;
}
if (parent != 1 && optind != argc) {
usage:
fprintf(stderr, "Usage: extrace [-f] [-w] [-o FILE] [-p PID|CMD...]\n");
exit(1);
}
sk_nl = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
if (sk_nl == -1) {
perror("socket sk_nl error");
exit(1);
}
my_nla.nl_family = AF_NETLINK;
my_nla.nl_groups = CN_IDX_PROC;
my_nla.nl_pid = getpid();
kern_nla.nl_family = AF_NETLINK;
kern_nla.nl_groups = CN_IDX_PROC;
kern_nla.nl_pid = 1;
if (bind(sk_nl, (struct sockaddr *)&my_nla, sizeof my_nla) == -1) {
perror("binding sk_nl error");
goto close_and_exit;
}
nl_hdr = (struct nlmsghdr *)buff;
cn_hdr = (struct cn_msg *)NLMSG_DATA(nl_hdr);
mcop_msg = (enum proc_cn_mcast_op*)&cn_hdr->data[0];
memset(buff, 0, sizeof buff);
*mcop_msg = PROC_CN_MCAST_LISTEN;
nl_hdr->nlmsg_len = SEND_MESSAGE_LEN;
nl_hdr->nlmsg_type = NLMSG_DONE;
nl_hdr->nlmsg_flags = 0;
nl_hdr->nlmsg_seq = 0;
nl_hdr->nlmsg_pid = getpid();
cn_hdr->id.idx = CN_IDX_PROC;
cn_hdr->id.val = CN_VAL_PROC;
cn_hdr->seq = 0;
cn_hdr->ack = 0;
cn_hdr->len = sizeof (enum proc_cn_mcast_op);
if (send(sk_nl, nl_hdr, nl_hdr->nlmsg_len, 0) != nl_hdr->nlmsg_len) {
printf("failed to send proc connector mcast ctl op!\n");
goto close_and_exit;
}
if (*mcop_msg == PROC_CN_MCAST_IGNORE) {
rc = 0;
goto close_and_exit;
}
if (optind != argc) {
pid_t child;
parent = getpid();
signal(SIGCHLD, sigchld);
child = fork();
if (child == -1) {
perror("fork");
goto close_and_exit;
}
if (child == 0) {
execvp(argv[optind], argv+optind);
perror("execvp");
goto close_and_exit;
}
}
signal(SIGINT, sigint);
rc = 0;
while (!quit) {
memset(buff, 0, sizeof buff);
from_nla_len = sizeof from_nla;
nlh = (struct nlmsghdr *)buff;
memcpy(&from_nla, &kern_nla, sizeof from_nla);
recv_len = recvfrom(sk_nl, buff, BUFF_SIZE, 0,
(struct sockaddr *)&from_nla, &from_nla_len);
if (from_nla.nl_pid != 0 || recv_len < 1)
continue;
while (NLMSG_OK(nlh, recv_len)) {
if (nlh->nlmsg_type == NLMSG_NOOP)
continue;
if (nlh->nlmsg_type == NLMSG_ERROR || nlh->nlmsg_type == NLMSG_OVERRUN)
break;
handle_msg(NLMSG_DATA(nlh));
if (nlh->nlmsg_type == NLMSG_DONE)
break;
nlh = NLMSG_NEXT(nlh, recv_len);
}
}
close_and_exit:
close(sk_nl);
return rc;
}
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