FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/chg_usr_exec.c

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <string.h>
    #include <errno.h>
    #include <pwd.h>
    
    #define EXECSHELL       "/bin/sh"
    
    int
    main(int argc, char *argv[])
    {
            char *plogin = NULL;
            char cmds[BUFSIZ] = { 0 };
            char sep[] = " ";
            struct passwd *ppw = NULL;
            int i, len;
    
            if (argc < 3 || strlen(argv[1]) == 0) {
                    (void) printf("\tUsage: %s <login> <commands> ...\n", argv[0]);
                    return (1);
            }
    
            plogin = argv[1];
            len = 0;
            for (i = 2; i < argc; i++) {
                    (void) snprintf(cmds+len, sizeof (cmds)-len,
                        "%s%s", argv[i], sep);
                    len += strlen(argv[i]) + strlen(sep);
            }
    
            if ((ppw = getpwnam(plogin)) == NULL) {
                    perror("getpwnam");
                    return (errno);
            }
            if (setgid(ppw->pw_gid) != 0) {
                    perror("setgid");
                    return (errno);
            }
            if (setuid(ppw->pw_uid) != 0) {
                    perror("setuid");
                    return (errno);
            }
    
            if (execl(EXECSHELL, "sh",  "-c", cmds, (char *)NULL) != 0) {
                    perror("execl: " EXECSHELL);
                    return (errno);
            }
    
            return (0);
    }

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