From 4060a0e9dad36565ae4f082d748d6a46234e8423 Mon Sep 17 00:00:00 2001 From: datenwolf <@datenwolf.net> Date: Tue, 18 Jan 2022 00:32:24 +0100 Subject: initial commit --- COPYING | 339 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 8 ++ README | 2 + pmon.c | 201 +++++++++++++++++++++++++++++++++++++ 4 files changed, 550 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 README create mode 100644 pmon.c diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/COPYING @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + 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., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..8ce08d8 --- /dev/null +++ b/Makefile @@ -0,0 +1,8 @@ +.PHONY: all clean + +all: pmon + +clean: + -rm pmon pmon.o + +pmon: pmon.o diff --git a/README b/README new file mode 100644 index 0000000..114705f --- /dev/null +++ b/README @@ -0,0 +1,2 @@ +A tool to monitor Linux process events in realtime. Original code taken +from https://bewareofgeek.livejournal.com/2945.html diff --git a/pmon.c b/pmon.c new file mode 100644 index 0000000..b7a5efa --- /dev/null +++ b/pmon.c @@ -0,0 +1,201 @@ +// code taken from https://bewareofgeek.livejournal.com/2945.html +// and extended with pid_cmdline and using it to print the cmdline on exec + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static char* pid_cmdline(pid_t const pid) +{ + char path[] = "/proc/xxxxxxxxxxx/cmdline"; + snprintf(path, sizeof(path)-1, "/proc/%lu/cmdline", (long unsigned)pid); + FILE *fil = fopen(path, "r"); + if( !fil ){ return NULL; } + size_t cmdlen = 0; + char *cmdline = NULL; + getline(&cmdline, &cmdlen, fil); + fclose(fil); + return cmdline; +} + +/* + * 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; +} + +/* + * handle a single process event + */ +static volatile bool need_exit = false; +static int handle_proc_ev(int nl_sock) +{ + 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; + + while (!need_exit) { + rc = recv(nl_sock, &nlcn_msg, sizeof(nlcn_msg), 0); + if (rc == 0) { + /* shutdown? */ + return 0; + } else if (rc == -1) { + if (errno == EINTR) continue; + perror("netlink recv"); + return -1; + } + char* cmdline = NULL; + switch (nlcn_msg.proc_ev.what) { + case PROC_EVENT_NONE: + printf("set mcast listen ok\n"); + break; + case PROC_EVENT_FORK: + printf("fork: parent tid=%d pid=%d -> child tid=%d pid=%d\n", + nlcn_msg.proc_ev.event_data.fork.parent_pid, + nlcn_msg.proc_ev.event_data.fork.parent_tgid, + nlcn_msg.proc_ev.event_data.fork.child_pid, + nlcn_msg.proc_ev.event_data.fork.child_tgid); + break; + case PROC_EVENT_EXEC: + cmdline = pid_cmdline(nlcn_msg.proc_ev.event_data.exec.process_pid); + printf("exec: tid=%d pid=%d, cmd='%s'\n", + nlcn_msg.proc_ev.event_data.exec.process_pid, + nlcn_msg.proc_ev.event_data.exec.process_tgid, + cmdline ); + break; + 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; + } + if( cmdline ){ free(cmdline); } + } + + return 0; +} + +static void on_sigint(int unused) +{ + need_exit = true; +} + +int main(int argc, const char *argv[]) +{ + int nl_sock; + int rc = EXIT_SUCCESS; + + signal(SIGINT, &on_sigint); + siginterrupt(SIGINT, true); + + 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 = handle_proc_ev(nl_sock); + if (rc == -1) { + rc = EXIT_FAILURE; + goto out; + } + + set_proc_ev_listen(nl_sock, false); + +out: + close(nl_sock); + exit(rc); +} -- cgit v1.2.3