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Annotation of coherent/d/bin/mesg.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Permit or deny messages (e.g. write, msg, etc.)
                      3:  * to be sent to the user's terminal.
                      4:  * As these commands are setuid, execute permission
                      5:  * may be used to control use of the terminal without
                      6:  * allowing indiscriminate use by other users of the
                      7:  * terminal.
                      8:  *
                      9:  * NOTE: the terminal is assumed to be stderr.
                     10:  */
                     11: 
                     12: #include <stdio.h>
                     13: #include <sys/stat.h>
                     14: 
                     15: main(argc, argv)
                     16: char *argv[];
                     17: {
                     18:        struct stat sb;
                     19:        char type = 'c';
                     20:        char *tty;
                     21:        char *ttyname();
                     22: 
                     23:        if (argc == 2) {
                     24:                if (argv[1][1]=='\0' && (*argv[1]=='y' || *argv[1]=='n'))
                     25:                        type = *argv[1];
                     26:                else if (strcmp(argv[1], "no")==0 || strcmp(argv[1], "yes")==0)
                     27:                        type = *argv[1];
                     28:                else
                     29:                        usage();
                     30:        } else if (argc != 1)
                     31:                usage();
                     32:        tty = ttyname(fileno(stderr));
                     33:        if (tty==NULL || stat(tty, &sb)<0) {
                     34:                fprintf(stderr, "Standard error not a tty\n");
                     35:                exit(2);
                     36:        }
                     37:        if (argc > 1) {
                     38:                if (type == 'n')
                     39:                        sb.st_mode &= ~S_IEXEC;
                     40:                else if (type == 'y')
                     41:                        sb.st_mode |= S_IEXEC;
                     42:                chmod(tty, sb.st_mode);
                     43:        } else
                     44:                printf("%s\n", sb.st_mode&S_IEXEC ? "yes" : "no");
                     45:        exit (sb.st_mode&S_IEXEC ? 0 : 1);
                     46: }
                     47: 
                     48: usage()
                     49: {
                     50:        fprintf(stderr, "Usage: mesg [n] [y]\n");
                     51:        exit(2);
                     52: }

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