aboutsummaryrefslogtreecommitdiffstats
path: root/gg_trackproc/gg_trackproc.c
diff options
context:
space:
mode:
Diffstat (limited to 'gg_trackproc/gg_trackproc.c')
-rw-r--r--gg_trackproc/gg_trackproc.c291
1 files changed, 291 insertions, 0 deletions
diff --git a/gg_trackproc/gg_trackproc.c b/gg_trackproc/gg_trackproc.c
new file mode 100644
index 0000000..ba06e7d
--- /dev/null
+++ b/gg_trackproc/gg_trackproc.c
@@ -0,0 +1,291 @@
+/*
+ * Track new process on Linux
+ * 2012 Laurent Ghigonis <laurent@p1sec.com>
+ *
+ * new version of trackproc.c
+ * that was inspired from http://bewareofgeek.livejournal.com/2945.html
+ * and pstree sources
+ */
+
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/connector.h>
+#include <linux/cn_proc.h>
+#include <signal.h>
+#include <err.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <event.h>
+#include <libglouglou.h>
+
+#define PROC_BASE "/proc"
+
+struct gg_client *ggcli;
+struct event_base *ev_base;
+
+static char*
+get_current_date() {
+ time_t ts;
+ struct tm *tm;
+ static char date_buf[64];
+
+ time(&ts);
+ tm = localtime(&ts);
+ strftime(date_buf, 64, "%b %d %X", tm);
+ return date_buf;
+}
+
+static int
+get_proc_infos(int pid, char **cmd) {
+ char path[128];
+ char readbuf[1024];
+ int size;
+ FILE *file;
+ char *comm, *tmpptr;
+
+ //if ((pid = (pid_t) atoi(de->d_name)) == 0) {
+ snprintf(path, sizeof(path), "%s/%d/stat", PROC_BASE, pid);
+ if ((file = fopen(path, "r")) == NULL) {
+ warn("Error: PID %d: cannot open %s\n", pid, path);
+ return -1;
+ }
+ size = fread(readbuf, 1, sizeof(readbuf), file);
+ if (ferror(file) != 0) {
+ warn("Error: PID %d: error reading %s", pid, path);
+ return -1;
+ }
+ readbuf[size] = 0;
+ /* commands may have spaces or ) in them.
+ * so don't trust anything from the ( to the last ) */
+ if (!(comm = strchr(readbuf, '('))
+ || !(tmpptr = strrchr(comm, ')'))) {
+ warn("Error: PID %d: could not parse %s", pid, path);
+ return -1;
+ }
+ ++comm;
+ *tmpptr = 0;
+ /* We now have readbuf with pid and cmd, and tmpptr+2
+ * with the rest */
+ fclose(file);
+
+ *cmd = comm;
+ return 0;
+}
+
+/*
+ * connect to netlink
+ * returns netlink socket, or -1 on error
+ */
+static int nl_connect()
+{
+ int rc;
+ int nl_sock;
+ struct sockaddr_nl sa_nl;
+
+ nl_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
+ if (nl_sock == -1) {
+ perror("socket");
+ return -1;
+ }
+
+ sa_nl.nl_family = AF_NETLINK;
+ sa_nl.nl_groups = CN_IDX_PROC;
+ sa_nl.nl_pid = getpid();
+
+ rc = bind(nl_sock, (struct sockaddr *)&sa_nl, sizeof(sa_nl));
+ if (rc == -1) {
+ perror("bind");
+ close(nl_sock);
+ return -1;
+ }
+
+ return nl_sock;
+}
+
+/*
+ * subscribe on proc events (process notifications)
+ */
+static int set_proc_ev_listen(int nl_sock, bool enable)
+{
+ int rc;
+ struct __attribute__ ((aligned(NLMSG_ALIGNTO))) {
+ struct nlmsghdr nl_hdr;
+ struct __attribute__ ((__packed__)) {
+ struct cn_msg cn_msg;
+ enum proc_cn_mcast_op cn_mcast;
+ };
+ } nlcn_msg;
+
+ memset(&nlcn_msg, 0, sizeof(nlcn_msg));
+ nlcn_msg.nl_hdr.nlmsg_len = sizeof(nlcn_msg);
+ nlcn_msg.nl_hdr.nlmsg_pid = getpid();
+ nlcn_msg.nl_hdr.nlmsg_type = NLMSG_DONE;
+
+ nlcn_msg.cn_msg.id.idx = CN_IDX_PROC;
+ nlcn_msg.cn_msg.id.val = CN_VAL_PROC;
+ nlcn_msg.cn_msg.len = sizeof(enum proc_cn_mcast_op);
+
+ nlcn_msg.cn_mcast = enable ? PROC_CN_MCAST_LISTEN : PROC_CN_MCAST_IGNORE;
+
+ rc = send(nl_sock, &nlcn_msg, sizeof(nlcn_msg), 0);
+ if (rc == -1) {
+ perror("netlink send");
+ return -1;
+ }
+
+ return 0;
+}
+
+void cb_nl(evutil_socket_t fd, short what, void *arg)
+{
+ int rc;
+ struct __attribute__ ((aligned(NLMSG_ALIGNTO))) {
+ struct nlmsghdr nl_hdr;
+ struct __attribute__ ((__packed__)) {
+ struct cn_msg cn_msg;
+ struct proc_event proc_ev;
+ };
+ } nlcn_msg;
+ static char *cmd;
+ struct gg_packet pkt;
+
+ rc = recv(fd, &nlcn_msg, sizeof(nlcn_msg), 0);
+ if (rc == 0) {
+ /* shutdown? */
+ printf("%s: stop listening to netlink events\n",
+ get_current_date());
+ event_base_loopexit(ev_base, NULL);
+ return;
+ } else if (rc == -1) {
+ if (errno == EINTR)
+ return;
+ perror("netlink recv");
+ event_base_loopexit(ev_base, NULL);
+ return;
+ }
+
+ pkt.ver = PACKET_VERSION;
+ /* see /usr/include/linux/cn_proc.h for struct proc_event */
+ switch (nlcn_msg.proc_ev.what) {
+ case PROC_EVENT_NONE:
+ /* XXX what is this event for ?
+ * printf("%s: start listening to netlink events...\n",
+ * get_current_date()); */
+ break;
+
+ case PROC_EVENT_FORK:
+ get_proc_infos(nlcn_msg.proc_ev.event_data.fork.parent_pid,
+ &cmd);
+ if (nlcn_msg.proc_ev.event_data.fork.child_tgid
+ != nlcn_msg.proc_ev.event_data.fork.child_pid)
+ printf("%s: fork %s %d -> %d tid %d\n",
+ get_current_date(),
+ cmd,
+ nlcn_msg.proc_ev.event_data.fork.parent_pid,
+ nlcn_msg.proc_ev.event_data.fork.child_pid,
+ nlcn_msg.proc_ev.event_data.fork.child_tgid);
+ else
+ printf("%s: fork %s %d -> %d\n",
+ get_current_date(),
+ cmd,
+ nlcn_msg.proc_ev.event_data.fork.parent_pid,
+ nlcn_msg.proc_ev.event_data.fork.child_pid);
+ pkt.type = PACKET_PROC_FORK;
+ pkt.proc_pid = htonl(nlcn_msg.proc_ev.event_data.fork.parent_pid);
+ pkt.proc_fork_ppid = htonl(nlcn_msg.proc_ev.event_data.fork.parent_pid);
+ pkt.proc_fork_cpid = htonl(nlcn_msg.proc_ev.event_data.fork.child_pid);
+ pkt.proc_fork_tgid = htonl(nlcn_msg.proc_ev.event_data.fork.child_tgid);
+ break;
+
+ case PROC_EVENT_EXEC:
+ get_proc_infos(nlcn_msg.proc_ev.event_data.exec.process_pid,
+ &cmd);
+ printf("%s: exec %d -> %s\n",
+ get_current_date(),
+ nlcn_msg.proc_ev.event_data.exec.process_pid,
+ cmd);
+ pkt.type = PACKET_PROC_EXEC;
+ pkt.proc_pid = htonl(nlcn_msg.proc_ev.event_data.fork.parent_pid);
+ pkt.proc_exec_cmdlen = htons(strnlen(cmd, GG_PKTARG_MAX));
+ strncpy((char *)pkt.proc_exec_cmd, cmd, GG_PKTARG_MAX);
+ break;
+#if 0
+ case PROC_EVENT_UID:
+ printf("uid change: tid=%d pid=%d from %d to %d\n",
+ nlcn_msg.proc_ev.event_data.id.process_pid,
+ nlcn_msg.proc_ev.event_data.id.process_tgid,
+ nlcn_msg.proc_ev.event_data.id.r.ruid,
+ nlcn_msg.proc_ev.event_data.id.e.euid);
+ break;
+
+ case PROC_EVENT_GID:
+ printf("gid change: tid=%d pid=%d from %d to %d\n",
+ nlcn_msg.proc_ev.event_data.id.process_pid,
+ nlcn_msg.proc_ev.event_data.id.process_tgid,
+ nlcn_msg.proc_ev.event_data.id.r.rgid,
+ nlcn_msg.proc_ev.event_data.id.e.egid);
+ break;
+
+ case PROC_EVENT_EXIT:
+ printf("exit: tid=%d pid=%d exit_code=%d\n",
+ nlcn_msg.proc_ev.event_data.exit.process_pid,
+ nlcn_msg.proc_ev.event_data.exit.process_tgid,
+ nlcn_msg.proc_ev.event_data.exit.exit_code);
+ break;
+
+ default:
+ printf("unhandled proc event\n");
+ break;
+#endif
+ }
+
+ gg_client_send(ggcli, &pkt);
+}
+
+static void on_sigint(int unused)
+{
+ event_base_loopexit(ev_base, NULL);
+}
+
+int main(int argc, const char *argv[])
+{
+ struct event *ev_nl;
+ int nl_sock;
+ int rc = EXIT_SUCCESS;
+
+ signal(SIGINT, &on_sigint);
+ siginterrupt(SIGINT, true);
+
+ ev_base = event_base_new();
+ ggcli = gg_client_connect(ev_base, "127.0.0.1", GLOUGLOU_PROBE_DEFAULT_PORT,
+ NULL, NULL, NULL);
+
+ nl_sock = nl_connect();
+ if (nl_sock == -1)
+ exit(EXIT_FAILURE);
+ rc = set_proc_ev_listen(nl_sock, true);
+ if (rc == -1) {
+ rc = EXIT_FAILURE;
+ goto out;
+ }
+ rc = set_proc_ev_listen(nl_sock, true);
+ if (rc == -1) {
+ rc = EXIT_FAILURE;
+ goto out;
+ }
+ ev_nl = event_new(ev_base, nl_sock, EV_READ|EV_PERSIST, cb_nl, NULL);
+ event_add(ev_nl, NULL);
+
+ event_base_dispatch(ev_base);
+
+ set_proc_ev_listen(nl_sock, false);
+
+out:
+ close(nl_sock);
+ exit(rc);
+}