slendi/sus
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Replace system call with execvpe

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xSlendiX 2021-09-08 01:23:24 +03:00
parent 253e48af77
commit 7d2966b3f7
1 changed files with 15 additions and 13 deletions
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26
sus.c
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@ -1,5 +1,7 @@
#define _GNU_SOURCE
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h>
#include <termios.h> #include <termios.h>
@ -7,14 +9,11 @@
#include <string.h> #include <string.h>
#define _XOPEN_SOURCE
#include <fcntl.h> #include <fcntl.h>
#include <grp.h> #include <grp.h>
#include <pwd.h> #include <pwd.h>
#include <shadow.h> #include <shadow.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h>
#include <errno.h> #include <errno.h>
@ -98,13 +97,13 @@ int main(int argc, char** argv)
memmove(username, username + 1, strlen(username)); memmove(username, username + 1, strlen(username));
} }
char* command = ""; // char* command = "";
for (int i = command_start; i < argc; i++) { // for (int i = command_start; i < argc; i++) {
cats(&command, argv[i]); // cats(&command, argv[i]);
cats(&command, " "); // cats(&command, " ");
} // }
command[strlen(command) - 1] = '\0'; // command[strlen(command) - 1] = '\0';
if (username[0] == '\0') if (username[0] == '\0')
uid = 0; uid = 0;
@ -113,10 +112,13 @@ int main(int argc, char** argv)
return 1; return 1;
} }
if (fork() == 0) { argv += command_start;
setuid(uid); setuid(uid);
system(command); char* path = getenv("PATH");
} char pathenv[strlen(path) + sizeof("PATH=")];
sprintf(pathenv, "PATH=%s", path);
char* envp[] = { pathenv, NULL };
execvpe(argv[0], argv, envp);
return 0; return 0;
} }