| 1 | /* |
| 2 | * login [ name ] |
| 3 | */ |
| 4 | |
| 5 | #include <sys/types.h> |
| 6 | #include <sgtty.h> |
| 7 | #include <utmp.h> |
| 8 | #include <signal.h> |
| 9 | #include <pwd.h> |
| 10 | #include <stdio.h> |
| 11 | #include <sys/stat.h> |
| 12 | #define SCPYN(a, b) strncpy(a, b, sizeof(a)) |
| 13 | |
| 14 | char maildir[30] = "/usr/spool/mail/"; |
| 15 | struct passwd nouser = {"", "nope"}; |
| 16 | struct sgttyb ttyb; |
| 17 | struct utmp utmp; |
| 18 | char minusnam[16] = "-"; |
| 19 | char homedir[64] = "HOME="; |
| 20 | char *envinit[] = {homedir, "PATH=:/bin:/usr/bin", 0}; |
| 21 | struct passwd *pwd; |
| 22 | |
| 23 | struct passwd *getpwnam(); |
| 24 | char *strcat(); |
| 25 | int setpwent(); |
| 26 | char *ttyname(); |
| 27 | char *crypt(); |
| 28 | char *getpass(); |
| 29 | char *rindex(); |
| 30 | extern char **environ; |
| 31 | |
| 32 | main(argc, argv) |
| 33 | char **argv; |
| 34 | { |
| 35 | register char *namep; |
| 36 | int t, f, c; |
| 37 | char *ttyn; |
| 38 | |
| 39 | alarm(60); |
| 40 | signal(SIGQUIT, SIG_IGN); |
| 41 | signal(SIGINT, SIG_IGN); |
| 42 | nice(-100); |
| 43 | nice(20); |
| 44 | nice(0); |
| 45 | gtty(0, &ttyb); |
| 46 | ttyb.sg_erase = '#'; |
| 47 | ttyb.sg_kill = '@'; |
| 48 | stty(0, &ttyb); |
| 49 | for (t=3; t<20; t++) |
| 50 | close(t); |
| 51 | ttyn = ttyname(0); |
| 52 | if (ttyn==0) |
| 53 | ttyn = "/dev/tty??"; |
| 54 | |
| 55 | loop: |
| 56 | SCPYN(utmp.ut_name, ""); |
| 57 | if (argc>1) { |
| 58 | SCPYN(utmp.ut_name, argv[1]); |
| 59 | argc = 0; |
| 60 | } |
| 61 | while (utmp.ut_name[0] == '\0') { |
| 62 | namep = utmp.ut_name; |
| 63 | printf("login: "); |
| 64 | while ((c = getchar()) != '\n') { |
| 65 | if(c == ' ') |
| 66 | c = '_'; |
| 67 | if (c == EOF) |
| 68 | exit(0); |
| 69 | if (namep < utmp.ut_name+8) |
| 70 | *namep++ = c; |
| 71 | } |
| 72 | } |
| 73 | setpwent(); |
| 74 | if ((pwd = getpwnam(utmp.ut_name)) == NULL) |
| 75 | pwd = &nouser; |
| 76 | endpwent(); |
| 77 | if (*pwd->pw_passwd != '\0') { |
| 78 | namep = crypt(getpass("Password:"),pwd->pw_passwd); |
| 79 | if (strcmp(namep, pwd->pw_passwd)) { |
| 80 | printf("Login incorrect\n"); |
| 81 | goto loop; |
| 82 | } |
| 83 | } |
| 84 | if(chdir(pwd->pw_dir) < 0) { |
| 85 | printf("No directory\n"); |
| 86 | goto loop; |
| 87 | } |
| 88 | time(&utmp.ut_time); |
| 89 | t = ttyslot(); |
| 90 | if (t>0 && (f = open("/etc/utmp", 1)) >= 0) { |
| 91 | lseek(f, (long)(t*sizeof(utmp)), 0); |
| 92 | SCPYN(utmp.ut_line, rindex(ttyn, '/')+1); |
| 93 | write(f, (char *)&utmp, sizeof(utmp)); |
| 94 | close(f); |
| 95 | } |
| 96 | if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) { |
| 97 | lseek(f, 0L, 2); |
| 98 | write(f, (char *)&utmp, sizeof(utmp)); |
| 99 | close(f); |
| 100 | } |
| 101 | chown(ttyn, pwd->pw_uid, pwd->pw_gid); |
| 102 | setgid(pwd->pw_gid); |
| 103 | setuid(pwd->pw_uid); |
| 104 | if (*pwd->pw_shell == '\0') |
| 105 | pwd->pw_shell = "/bin/sh"; |
| 106 | environ = envinit; |
| 107 | strncat(homedir, pwd->pw_dir, sizeof(homedir)-6); |
| 108 | if ((namep = rindex(pwd->pw_shell, '/')) == NULL) |
| 109 | namep = pwd->pw_shell; |
| 110 | else |
| 111 | namep++; |
| 112 | strcat(minusnam, namep); |
| 113 | alarm(0); |
| 114 | umask(02); |
| 115 | showmotd(); |
| 116 | strcat(maildir, pwd->pw_name); |
| 117 | if(access(maildir,4)==0) { |
| 118 | struct stat statb; |
| 119 | stat(maildir, &statb); |
| 120 | if (statb.st_size) |
| 121 | printf("You have mail.\n"); |
| 122 | } |
| 123 | signal(SIGQUIT, SIG_DFL); |
| 124 | signal(SIGINT, SIG_DFL); |
| 125 | execlp(pwd->pw_shell, minusnam, 0); |
| 126 | printf("No shell\n"); |
| 127 | exit(0); |
| 128 | } |
| 129 | |
| 130 | int stopmotd; |
| 131 | catch() |
| 132 | { |
| 133 | signal(SIGINT, SIG_IGN); |
| 134 | stopmotd++; |
| 135 | } |
| 136 | |
| 137 | showmotd() |
| 138 | { |
| 139 | FILE *mf; |
| 140 | register c; |
| 141 | |
| 142 | signal(SIGINT, catch); |
| 143 | if((mf = fopen("/etc/motd","r")) != NULL) { |
| 144 | while((c = getc(mf)) != EOF && stopmotd == 0) |
| 145 | putchar(c); |
| 146 | fclose(mf); |
| 147 | } |
| 148 | signal(SIGINT, SIG_IGN); |
| 149 | } |