Commit | Line | Data |
---|---|---|
05bfa7f4 TL |
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 | } |