diff options
Diffstat (limited to 'src/tools/cgclassify.c')
| -rw-r--r-- | src/tools/cgclassify.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/tools/cgclassify.c b/src/tools/cgclassify.c new file mode 100644 index 0000000..c044608 --- /dev/null +++ b/src/tools/cgclassify.c @@ -0,0 +1,219 @@ +/* + * Copyright RedHat Inc. 2008 + * + * Authors: Vivek Goyal <vgoyal@redhat.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <libcgroup.h> +#include <limits.h> +#include <pwd.h> +#include <unistd.h> +#include <getopt.h> +#include <sys/mount.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include "tools-common.h" + +#define TEMP_BUF 81 + +/* + * Go through /proc/<pid>/status file to determine the euid of the + * process. + * It returns 0 on success and negative values on failure. + */ + +int euid_of_pid(pid_t pid) +{ + FILE *fp; + char path[FILENAME_MAX]; + char buf[TEMP_BUF]; + uid_t ruid, euid, suid, fsuid; + + sprintf(path, "/proc/%d/status", pid); + fp = fopen(path, "r"); + if (!fp) { + cgroup_dbg("Error in opening file %s:%s\n", path, + strerror(errno)); + return -1; + } + + while (fgets(buf, TEMP_BUF, fp)) { + if (!strncmp(buf, "Uid:", 4)) { + sscanf((buf + 5), "%d%d%d%d", (int *)&ruid, + (int *)&euid, (int *)&suid, (int *)&fsuid); + cgroup_dbg("Scanned proc values are %d %d %d %d\n", + ruid, euid, suid, fsuid); + return euid; + } + } + + /* If we are here, we could not find euid. Return error. */ + return -1; +} + +/* + * Go through /proc/<pid>/status file to determine the egid of the + * process. + * It returns 0 on success and negative values on failure. + */ + +int egid_of_pid(pid_t pid) +{ + FILE *fp; + char path[FILENAME_MAX]; + char buf[TEMP_BUF]; + gid_t rgid, egid, sgid, fsgid; + + sprintf(path, "/proc/%d/status", pid); + fp = fopen(path, "r"); + if (!fp) { + cgroup_dbg("Error in opening file %s:%s\n", path, + strerror(errno)); + return -1; + } + + while (fgets(buf, TEMP_BUF, fp)) { + if (!strncmp(buf, "Gid:", 4)) { + sscanf((buf + 5), "%d%d%d%d", (int *)&rgid, + (int *)&egid, (int *)&sgid, (int *)&fsgid); + cgroup_dbg("Scanned proc values are %d %d %d %d\n", + rgid, egid, sgid, fsgid); + return egid; + } + } + + /* If we are here, we could not find egid. Return error. */ + return -1; +} + +/* + * Change process group as specified on command line. + */ +int change_group_path(pid_t pid, struct cgroup_group_spec *cgroup_list[]) +{ + int i; + int ret = 0; + + for (i = 0; i < CG_HIER_MAX; i++) { + if (!cgroup_list[i]) + break; + + ret = cgroup_change_cgroup_path(cgroup_list[i]->path, pid, + cgroup_list[i]->controllers); + if (ret) + fprintf(stderr, "Error changing group of pid %d: %s\n", + pid, cgroup_strerror(ret)); + return -1; + } + + return 0; +} + +/* + * Change process group as specified in cgrules.conf. + */ +int change_group_uid_gid(pid_t pid) +{ + uid_t euid; + gid_t egid; + int ret; + + /* Put pid into right cgroup as per rules in /etc/cgrules.conf */ + euid = euid_of_pid(pid); + if (euid == -1) { + fprintf(stderr, "Error in determining euid of" + " pid %d\n", pid); + return -1; + } + + egid = egid_of_pid(pid); + if (egid == -1) { + fprintf(stderr, "Error in determining egid of" + " pid %d\n", pid); + return -1; + } + + /* Change the cgroup by determining the rules based on uid */ + ret = cgroup_change_cgroup_uid_gid(euid, egid, pid); + if (ret) { + fprintf(stderr, "Error: change of cgroup failed for" + " pid %d: %s\n", + pid, cgroup_strerror(ret)); + return -1; + } + + return 0; +} + +int main(int argc, char *argv[]) +{ + int ret = 0, i, exit_code = 0; + pid_t pid; + int cg_specified = 0; + struct cgroup_group_spec *cgroup_list[CG_HIER_MAX]; + int c; + + + if (argc < 2) { + fprintf(stderr, "usage is %s " + "[-g <list of controllers>:<relative path to cgroup>] " + "<list of pids> \n", + argv[0]); + exit(2); + } + + memset(cgroup_list, 0, sizeof(cgroup_list)); + while ((c = getopt(argc, argv, "+g:")) > 0) { + switch (c) { + case 'g': + if (parse_cgroup_spec(cgroup_list, optarg)) { + fprintf(stderr, "cgroup controller and path" + "parsing failed\n"); + return -1; + } + cg_specified = 1; + break; + default: + fprintf(stderr, "Invalid command line option\n"); + exit(2); + break; + } + } + + + /* Initialize libcg */ + ret = cgroup_init(); + if (ret) { + fprintf(stderr, "libcgroup initialization failed:%d\n", ret); + return ret; + } + + for (i = optind; i < argc; i++) { + pid = (uid_t) atoi(argv[i]); + + if (cg_specified) + ret = change_group_path(pid, cgroup_list); + else + ret = change_group_uid_gid(pid); + + /* if any group change fails */ + if (ret) + exit_code = 1; + } + return exit_code; + +} |