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Merge pull request #470 from JL2210/update-src-tools-sudo
Update src/tools/sudo.c with more features
authored by
Luboš Doležel
and committed by
GitHub
9216e47a
b86fb4ad
+57
-15
+57
-15
src/tools/sudo.c
+57
-15
src/tools/sudo.c
···
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char** argv)
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{
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int firstarg = 1;
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unsigned int firstarg = 1, uid = 0, gid = 0;
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if (argc <= 1)
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{
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fprintf(stderr, "This is Darling fake sudo.\n"
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"Processes will think they run as UID/GID 0, but Linux kernel will still see your original UID.\n"
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"The purpose is to convince some tools that they can write into / or enable you to talk to certain system daemons\n.");
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return 1;
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}
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int argparse(int, char**);
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int usage(int, int);
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setuid(0);
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setgid(0);
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int main(int argc, char **argv)
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{
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if ( ( argparse(argc, argv) || usage(argc, 0) ) == 1 )
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return 1;
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if (strcmp(argv[1], "-k") == 0)
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firstarg++;
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setuid(uid);
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setgid(gid);
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execvp(argv[firstarg], &argv[firstarg]);
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perror("Cannot execute:");
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perror("Error");
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return 1;
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}
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int argparse(int argc, char **argv)
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{
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while( (argv[firstarg] != NULL) && (!strncmp(argv[firstarg], "-", 1)) )
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{
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if(!strcmp(argv[firstarg], "-g"))
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{
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sscanf(argv[++firstarg], "%u", &gid);
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firstarg++;
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}
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else if(!strcmp(argv[firstarg], "-u"))
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{
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sscanf(argv[++firstarg], "%u", &uid);
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firstarg++;
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}
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else if(!strcmp(argv[firstarg], "--"))
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{
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firstarg++;
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break;
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}
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else if(!strcmp(argv[firstarg], "-k"))
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firstarg++;
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else if(!strcmp(argv[firstarg], "--help"))
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return usage(argc, 1);
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else
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{
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fprintf(stderr, "Unknown option: %s\n", argv[firstarg]);
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return usage(argc, 1);
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}
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}
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return 0;
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}
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int usage(int argc, int arg_help)
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{
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if (argc <= (int)firstarg || arg_help == 1)
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{
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fprintf(stderr, "This is a fake 'sudo' implementation, intended for use in Darling.\n"
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"Processes will think they are run as UID/GID 0, but they are still run as your original UID/GID.\n"
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"One purpose of this program is to convince some tools that they can write into '/'.\n"
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"Another is to enable you to talk to certain system daemons.\n"
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"\nUsage:\n"
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" sudo [-g GID] [-u UID] [-k] [--] COMMAND\n");
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return 1;
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}
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return 0;
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}