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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <utmp.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
/* examine and fix utmp entries. Note that the code for fixing entries
is not complete, and indeed does nothing at all at this time. No bug
reports, please, as I am still actively working on this. It is not
here for general use, but only so that I can ferret out any bugs that
exist on other peoples systems without having to log in to their systems
myself ;-) */
int main (int argc, char **argv) {
FILE *ut; /* /var/run/utmp */
struct utmp uts; /* utmp record */
char user[UT_NAMESIZE + 1];
char host[17];
char ch;
int print_all = 0, list = 0, fix = 0;
/* get options */
while ((ch = getopt(argc, argv, "laf")) != EOF)
switch (ch) {
case 'a':
print_all = 1;
break;
case 'l':
list = 1;
break;
case 'f':
fix = 1;
break;
}
/* check argument options */
if ( (!list && !print_all && !fix)) {
fprintf(stderr, "You must specify a command line option:\n\tl = list\n\
\tf = fix\n\ta = all (requires l or f)\n");
exit(1);
}
if (list) {
ut = fopen(UTMP_FILE, "r");
while (fread(&uts, sizeof(uts), 1, ut))
if (((uts.ut_type == USER_PROCESS) && (uts.ut_name[0] != '\000'))
|| print_all) {
strncpy(user, uts.ut_user, UT_NAMESIZE);
user[UT_NAMESIZE]=0;
strncpy(host, uts.ut_host, 16);
host[16]=0;
printf("ut_type: %d\n", uts.ut_type);
printf("ut_pid: %d\n", uts.ut_pid);
printf("ut_line: %s\n", uts.ut_line);
printf("ut_id: %2s\n", uts.ut_id);
printf("ut_time: %d\n", uts.ut_time);
printf("ut_user: %s\n", user);
printf("ut_host: %s\n", host);
printf("ut_addr: %d\n\n", uts.ut_addr);
}
fclose(ut);
}
if (fix) {
ut = fopen(UTMP_FILE, "r");
while (fread(&uts, sizeof(uts), 1, ut))
if (((uts.ut_type == USER_PROCESS) && (uts.ut_name[0] != '\000'))
|| print_all) {
/* Display entry in utmp */
strncpy(user, uts.ut_user, UT_NAMESIZE);
user[UT_NAMESIZE]=0;
strncpy(host, uts.ut_host, 16);
host[16]=0;
printf("ut_type: %d\n", uts.ut_type);
printf("ut_pid: %d\n", uts.ut_pid);
printf("ut_line: %s\n", uts.ut_line);
printf("ut_id: %s2\n", uts.ut_id);
printf("ut_time: %d\n", uts.ut_time);
printf("ut_user: %s\n", user);
printf("ut_host: %s\n", host);
printf("ut_addr: %d\n\n", uts.ut_addr);
printf("Modify this record? (y/N): "); fflush(stdout);
/* Ask if to delete or no */
if ((ch = getchar()) == 'y' || ch == 'Y') {
while (getchar() != '\n');
printf("Change ut_type? "); fflush(stdout);
if ((ch = getchar()) == 'y' || ch == 'Y') {
while (getchar() != '\n');
printf("INIT, LOGIN, USER, or DEAD_PROCESS? (I/L/U/D): ");
fflush(stdout);
ch = getchar();
switch (ch) {
case 'i':
case 'I':
uts.ut_type = INIT_PROCESS;
break;
case 'l':
case 'L':
uts.ut_type = LOGIN_PROCESS;
break;
case 'u':
case 'U':
uts.ut_type = USER_PROCESS;
break;
case 'd':
case 'D':
uts.ut_type = DEAD_PROCESS;
break;
default:
printf("Invalid choice: %c\n", ch);
}
if (ch != '\n') while ((ch = getchar()) != '\n');
}
if (ch != '\n') while ((ch = getchar()) != '\n');
printf("Change ut_id field? (y/N): "); fflush(stdout);
if ((ch = getchar()) == 'y' || ch == 'Y') {
while (getchar() != '\n');
printf("Please enter the two characters for ut_id: ");
fflush(stdout);
uts.ut_id[0] = getchar();
uts.ut_id[1] = getchar();
while ((ch = getchar()) != '\n');
}
if (ch != '\n') while ((ch = getchar()) != '\n');
printf("Change the ut_user field? (y/N): "); fflush(stdout);
if ((ch = getchar()) == 'y' || ch == 'Y') {
int i;
while (getchar() != '\n');
printf("Please enter the new ut_name, up to %c characters: ",
UT_NAMESIZE);
fflush(stdout);
for (i=0; i<UT_NAMESIZE; i++) {
ch = getchar();
uts.ut_user[i] = (ch != '\n') ? ch : i = UT_NAMESIZE, (char) 0;
}
}
if (ch != '\n') while ((ch = getchar()) != '\n');
printf("Change the ut_host field? (y/N): "); fflush(stdout);
if ((ch = getchar()) == 'y' || ch == 'Y') {
int i;
while (getchar() != '\n');
printf("Please enter the new ut_host, up to 16 characters: ");
fflush(stdout);
for (i=0; i<16; i++) {
ch = getchar();
uts.ut_user[i] = (ch != '\n') ? ch : i = 16, (char) 0;
}
if (ch != '\n') while ((ch = getchar()) != '\n');
}
/* Here go the changes...*/
/* utmpname(UTMP_FILE);
setutent();
pututline(&uts);
endutent(); */
/* But they don't work... */
}
if (ch != '\n') while ((ch = getchar()) != '\n');
/* here we should write the utmp entry */
}
fclose(ut);
}
return 0;
}
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