commands/talkd/finduser.c

   1 /* finduser.c Copyright Michael Temari 07/22/1996 All Rights Reserved */
   2
   3 #include <sys/types.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7 #include <stdlib.h>
   8 #include <fcntl.h>
   9 #include <time.h>
  10 #include <utmp.h>
  11 #include <net/gen/in.h>
  12
  13 #include "talk.h"
  14 #include "finduser.h"
  15
  16 int find_user(name, tty)
  17 char *name;
  18 char *tty;
  19 {
  20 int fd;
  21 int ret;
  22 struct utmp utmp;
  23
  24    /* Now find out if the requested user is logged in. */
  25    if((fd = open(UTMP, O_RDONLY)) < 0) {
  26         perror("talkd: opening UTMP file");
  27         return(FAILED);
  28    }
  29
  30    ret = NOT_HERE;
  31
  32    while(read(fd, &utmp, sizeof(struct utmp)) == sizeof(struct utmp)) {
  33         if(utmp.ut_type != USER_PROCESS) continue;
  34         if(strncmp(utmp.ut_user, name, sizeof(utmp.ut_user))) continue;
  35         if(*tty && strncmp(utmp.ut_line, tty, sizeof(utmp.ut_line))) continue;
  36         strcpy(tty, utmp.ut_line);
  37         ret = SUCCESS;
  38         break;
  39    }
  40
  41    close(fd);
  42
  43    return(ret);
  44 }