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/*
* pscap.c - A program that lists running processes with capabilities
* Copyright (c) 2009 Red Hat Inc., Durham, North Carolina.
* All Rights Reserved.
*
* This software may be freely redistributed and/or modified under the
* terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, 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; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Authors:
* Steve Grubb <sgrubb@redhat.com>
*/
#include "config.h"
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <pwd.h>
#include "cap-ng.h"
static void usage(void)
{
fprintf(stderr, "usage: pscap [-a]\n");
exit(1);
}
int main(int argc, char *argv[])
{
DIR *d;
struct dirent *ent;
int header = 0, show_all = 0, caps;
if (argc > 2) {
fputs("Too many arguments\n", stderr);
usage();
}
if (argc == 2) {
if (strcmp(argv[1], "-a") == 0)
show_all = 1;
else
usage();
}
/* Drop capabilities so we aren't listed */
caps = capng_have_capabilities(CAPNG_SELECT_CAPS);
if (caps == CAPNG_FULL) {
capng_clear(CAPNG_SELECT_BOTH);
capng_apply(CAPNG_SELECT_BOTH);
}
d = opendir("/proc");
if (d == NULL) {
printf("Can't open /proc: %s\n", strerror(errno));
return 1;
}
while (( ent = readdir(d) )) {
int pid, ppid, uid = -1, euid = -1;
char buf[100];
char *tmp, cmd[16], state, *name = NULL;
int fd, len;
struct passwd *p;
// Skip non-process dir entries
if(*ent->d_name<'0' || *ent->d_name>'9')
continue;
errno = 0;
pid = strtol(ent->d_name, NULL, 10);
if (errno)
continue;
// Parse up the stat file for the proc
snprintf(buf, 32, "/proc/%d/stat", pid);
fd = open(buf, O_RDONLY, 0);
if (fd < 0)
continue;
len = read(fd, buf, sizeof buf - 1);
close(fd);
if (len < 40)
continue;
buf[len] = 0;
tmp = strrchr(buf, ')');
if (tmp)
*tmp = 0;
else
continue;
memset(cmd, 0, sizeof(cmd));
sscanf(buf, "%d (%15c", &ppid, cmd);
sscanf(tmp+2, "%c %d", &state, &ppid);
// Skip kthreads
if (pid == 2 || ppid == 2)
continue;
if (!show_all && pid == 1)
continue;
// now get the capabilities
capng_clear(CAPNG_SELECT_BOTH);
capng_setpid(pid);
if (capng_get_caps_process())
continue;
// And print out anything with capabilities
caps = capng_have_capabilities(CAPNG_SELECT_CAPS);
if (caps > CAPNG_NONE) {
// Get the effective uid
FILE *f;
int line;
snprintf(buf, 32, "/proc/%d/status", pid);
f = fopen(buf, "rt");
if (f == NULL)
euid = 0;
else {
line = 0;
__fsetlocking(f, FSETLOCKING_BYCALLER);
while (fgets(buf, sizeof(buf), f)) {
if (line == 0) {
line++;
continue;
}
if (memcmp(buf, "Uid:", 4) == 0) {
int id;
sscanf(buf, "Uid: %d %d",
&id, &euid);
break;
}
}
fclose(f);
}
len = read(fd, buf, sizeof buf - 1);
close(fd);
if (header == 0) {
printf("%-5s %-5s %-10s %-16s %s\n",
"ppid", "pid", "name", "command",
"capabilities");
header = 1;
}
if (euid == 0) {
// Take short cut for this one
name = "root";
uid = 0;
} else if (euid != uid) {
// Only look up if name changed
p = getpwuid(euid);
uid = euid;
if (p)
name = p->pw_name;
// If not taking this branch, use last val
}
if (name) {
printf("%-5d %-5d %-10s %-16s ", ppid, pid,
name, cmd);
} else
printf("%-5d %-5d %-10d %-16s ", ppid, pid,
uid, cmd);
if (caps == CAPNG_PARTIAL) {
capng_print_caps_text(CAPNG_PRINT_STDOUT,
CAPNG_PERMITTED);
if (capng_have_capabilities(CAPNG_SELECT_BOUNDS)
== CAPNG_FULL)
printf(" +");
printf("\n");
} else
printf("full\n");
}
}
closedir(d);
return 0;
}
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