| 1 |
#include <stdio.h> |
| 2 |
#include <stdlib.h> |
| 3 |
#include <unistd.h> |
| 4 |
#include <errno.h> |
| 5 |
#include <string.h> |
| 6 |
#include <sys/times.h> |
| 7 |
#include <sys/types.h> |
| 8 |
#include <sys/wait.h> |
| 9 |
#include <grp.h> |
| 10 |
|
| 11 |
#define UNOBODY 99 |
| 12 |
#define GNOBODY 99 |
| 13 |
|
| 14 |
#define SRCUID 500 |
| 15 |
#define TGTUID UNOBODY |
| 16 |
#define TGTGID GNOBODY |
| 17 |
|
| 18 |
static const char sccsid[] = "@(#)$Id$"; |
| 19 |
|
| 20 |
extern int optind; |
| 21 |
extern char *optarg; |
| 22 |
|
| 23 |
/* The GNU C library cannot parse options correctly unless "+" is used */ |
| 24 |
#if defined __GNUC__ |
| 25 |
#define OPTSTRING "+q" |
| 26 |
#else |
| 27 |
#define OPTSTRING "q" |
| 28 |
#endif |
| 29 |
|
| 30 |
int main(argc,argv) |
| 31 |
int argc; |
| 32 |
char **argv; |
| 33 |
{ |
| 34 |
|
| 35 |
struct tms tms_start,tms_stop; |
| 36 |
clock_t t_start,t_end; |
| 37 |
clock_t clock_ticks = 0; |
| 38 |
|
| 39 |
pid_t pid_child,wpid; |
| 40 |
int rc; |
| 41 |
int c; |
| 42 |
int opt_quiet = 0; |
| 43 |
|
| 44 |
while ( (c = getopt(argc,argv,OPTSTRING)) > 0 ) { |
| 45 |
switch (c) { |
| 46 |
case 'q': opt_quiet++; break; |
| 47 |
default: |
| 48 |
fprintf(stderr,"Invalid options: exiting.\n"); |
| 49 |
exit(EXIT_FAILURE); |
| 50 |
break; |
| 51 |
} |
| 52 |
} |
| 53 |
|
| 54 |
if (optind >= argc ) { |
| 55 |
fprintf(stderr,"Usage: %s [-q] command [arguments]\n", |
| 56 |
argv[0]); |
| 57 |
exit(EXIT_FAILURE); |
| 58 |
} |
| 59 |
|
| 60 |
if ( getuid() != SRCUID ) { |
| 61 |
fprintf(stderr, |
| 62 |
"You are not allowed to experiment with %s:\n" |
| 63 |
"your uid %d is not a valid source uid\n", |
| 64 |
argv[0],getuid()); |
| 65 |
exit(EXIT_FAILURE); |
| 66 |
} |
| 67 |
|
| 68 |
rc=setgroups(0,NULL); |
| 69 |
if (rc) { |
| 70 |
printf("Could not clear supplementary groups (error %d): %s\n", |
| 71 |
errno,strerror(errno)); |
| 72 |
exit(EXIT_FAILURE); |
| 73 |
} |
| 74 |
|
| 75 |
rc=setgid(TGTGID); |
| 76 |
if (rc) { |
| 77 |
printf("Could not set primary group to %d (error %d): %s\n", |
| 78 |
TGTGID,errno,strerror(errno)); |
| 79 |
exit(EXIT_FAILURE); |
| 80 |
} |
| 81 |
|
| 82 |
rc=setuid(TGTUID); |
| 83 |
if (rc) { |
| 84 |
printf("Could not change identity to uid %d (error %d): %s\n", |
| 85 |
TGTUID,errno,strerror(errno)); |
| 86 |
exit(EXIT_FAILURE); |
| 87 |
} |
| 88 |
|
| 89 |
if ( ! opt_quiet ) |
| 90 |
printf("Notice: identity changed to uid %d\n",geteuid()); |
| 91 |
|
| 92 |
clock_ticks = sysconf(_SC_CLK_TCK); |
| 93 |
|
| 94 |
t_start = times(&tms_start); |
| 95 |
|
| 96 |
pid_child = fork(); |
| 97 |
|
| 98 |
switch(pid_child) { |
| 99 |
case 0: /* we are the child */ |
| 100 |
rc=execvp(argv[optind],argv+optind); |
| 101 |
printf("Child execvp of %s failed (error %d): %s\n", |
| 102 |
argv[optind],errno,strerror(errno)); |
| 103 |
exit(EXIT_FAILURE); |
| 104 |
break ;; |
| 105 |
case -1: |
| 106 |
fprintf(stderr,"Cannot fork (error %d); %s\n", |
| 107 |
errno,strerror(errno)); |
| 108 |
exit(EXIT_FAILURE); |
| 109 |
default: |
| 110 |
wpid = waitpid(pid_child, &rc, 0); |
| 111 |
t_end = times(&tms_stop); |
| 112 |
|
| 113 |
if ( ! opt_quiet ) { |
| 114 |
printf("times utime/stime: real/user/sys (%f/%f/%f)\n", |
| 115 |
(double)(t_end - t_start)/clock_ticks, |
| 116 |
(double)(tms_stop.tms_utime - |
| 117 |
tms_start.tms_utime)/clock_ticks, |
| 118 |
(double)(tms_stop.tms_stime - |
| 119 |
tms_start.tms_stime)/clock_ticks); |
| 120 |
printf("times cutime/cstime: real/user/sys (%f/%f/%f)\n", |
| 121 |
(double)(t_end - t_start)/clock_ticks, |
| 122 |
(double)(tms_stop.tms_cutime - |
| 123 |
tms_start.tms_cutime)/clock_ticks, |
| 124 |
(double)(tms_stop.tms_cstime - |
| 125 |
tms_start.tms_cstime)/clock_ticks); |
| 126 |
printf("Child return code: %d\n",rc); |
| 127 |
} |
| 128 |
break ; |
| 129 |
} |
| 130 |
|
| 131 |
return (EXIT_SUCCESS); |
| 132 |
} |
Parent Directory
| 
Revision Log