libbb/login.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * issue.c: issue printing code
   4  *
   5  * Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org>
   6  *
   7  * Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru>
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  10  */
  11
  12 #include <sys/param.h>  /* MAXHOSTNAMELEN */
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include "libbb.h"
  16
  17 #include <sys/utsname.h>
  18 #include <time.h>
  19
  20 #define LOGIN " login: "
  21
  22 static const char fmtstr_d[] = "%A, %d %B %Y";
  23 static const char fmtstr_t[] = "%H:%M:%S";
  24
  25 void print_login_issue(const char *issue_file, const char *tty)
  26 {
  27         FILE *fd;
  28         int c;
  29         char buf[256+1];
  30         const char *outbuf;
  31         time_t t;
  32         struct utsname uts;
  33
  34         time(&t);
  35         uname(&uts);
  36
  37         puts("\r");     /* start a new line */
  38
  39         if ((fd = fopen(issue_file, "r"))) {
  40                 while ((c = fgetc(fd)) != EOF) {
  41                         outbuf = buf;
  42                         buf[0] = c;
  43                         if(c == '\n') {
  44                                 buf[1] = '\r';
  45                                 buf[2] = 0;
  46                         } else {
  47                                 buf[1] = 0;
  48                         }
  49                         if (c == '\\' || c == '%') {
  50                                 c = fgetc(fd);
  51                                 switch (c) {
  52                                         case 's':
  53                                                 outbuf = uts.sysname;
  54                                                 break;
  55
  56                                         case 'n':
  57                                                 outbuf = uts.nodename;
  58                                                 break;
  59
  60                                         case 'r':
  61                                                 outbuf = uts.release;
  62                                                 break;
  63
  64                                         case 'v':
  65                                                 outbuf = uts.version;
  66                                                 break;
  67
  68                                         case 'm':
  69                                                 outbuf = uts.machine;
  70                                                 break;
  71
  72                                         case 'D':
  73                                         case 'o':
  74                                                 c = getdomainname(buf, sizeof(buf) - 1);
  75                                                 buf[c >= 0 ? c : 0] = '\0';
  76                                                 break;
  77
  78                                         case 'd':
  79                                                 strftime(buf, sizeof(buf), fmtstr_d, localtime(&t));
  80                                                 break;
  81
  82                                         case 't':
  83                                                 strftime(buf, sizeof(buf), fmtstr_t, localtime(&t));
  84                                                 break;
  85
  86                                         case 'h':
  87                                                 gethostname(buf, sizeof(buf) - 1);
  88                                                 buf[sizeof(buf) - 1] = '\0';
  89                                                 break;
  90
  91                                         case 'l':
  92                                                 outbuf = tty;
  93                                                 break;
  94
  95                                         default:
  96                                                 buf[0] = c;
  97                                 }
  98                         }
  99                         fputs(outbuf, stdout);
 100                 }
 101
 102                 fclose(fd);
 103
 104                 fflush(stdout);
 105         }
 106 }
 107
 108 void print_login_prompt(void)
 109 {
 110         char buf[MAXHOSTNAMELEN+1];
 111
 112         if(gethostname(buf, MAXHOSTNAMELEN) == 0)
 113                 fputs(buf, stdout);
 114
 115         fputs(LOGIN, stdout);
 116         fflush(stdout);
 117 }
 118