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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <sys/types.h>
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4 #include <unistd.h>
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5 #include <sys/stat.h>
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6 #include <string.h>
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7
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8 #define AFTER5PATH "./after5.cgi"
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9
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10 int main(int argc, char *argv[])
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11 {
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12 char *path=malloc(strlen(argv[0]));
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13 char *p;
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14 uid_t euid = geteuid();
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15 struct stat st;
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16 if (0 == euid) {
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17 fputs("Do not call this program with suid 0\n", stderr);
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18 exit(0);
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19 }
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20 strcpy(path, argv[0]);
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21 p = strrchr(path, '/');
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22 if (p) {
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23 *p = '\0';
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24 } else {
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25 fputs("Cannot detect the directory where this program located.\n", stderr);
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26 exit(1);
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27 }
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28
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29 if (-1 == chdir(path)) {
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30 fprintf(stderr, "Cannot chdir to %s\n", path);
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31 exit(2);
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32 }
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33 if (0 > stat(AFTER5PATH, &st)) {
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34 fprintf(stderr, "Cannot access %s\n", AFTER5PATH);
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35 exit(3);
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36 }
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37 if (st.st_uid != euid) {
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38 fputs("UID of cgi program mismatch\n", stderr);
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39 fputs("Do chown so that wrapper and cgi files' uid matches.\n", stderr);
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40 exit(4);
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41 }
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42 if (0 > stat(".", &st)) {
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43 fputs("Cannot stat current directory\n", stderr);
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44 fputs("Please ensure installed directory is readable.\n", stderr);
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45 exit(5);
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46 }
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47 if (st.st_uid != euid) {
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48 fputs("UID of directory mismatch\n", stderr);
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49 fputs("Do chown so that wrapper and directorys' uid matches.\n", stderr);
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50 exit(6);
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51 }
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52 if (st.st_mode & (S_IWGRP | S_IWOTH)) {
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53 fputs("This directory is writable for group/others.\n", stderr);
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54 fputs("Do chmod og-w for installed directory.\n", stderr);
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55 exit(7);
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56 }
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57 execv("./after5.cgi", argv);
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58 }
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