Commit | Line | Data |
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52b4fb0c | 1 | #ifndef lint |
a0f59ac1 | 2 | static char sccsid[] = "@(#)rwhod.c 4.4 82/10/10"; |
52b4fb0c BJ |
3 | #endif |
4 | ||
5 | #include <stdio.h> | |
6 | #include <signal.h> | |
7 | #include <sys/types.h> | |
8 | #include <net/in.h> | |
9 | #include <sys/socket.h> | |
10 | #include <errno.h> | |
11 | #include <utmp.h> | |
12 | #include "rwhod.h" | |
13 | #include <sys/stat.h> | |
14 | #include <nlist.h> | |
15 | #include <sys/ioctl.h> | |
a0f59ac1 SL |
16 | #include <ctype.h> |
17 | #include <netdb.h> | |
52b4fb0c | 18 | |
a0f59ac1 | 19 | struct sockaddr_in sin = { AF_INET }; |
52b4fb0c BJ |
20 | |
21 | extern errno; | |
22 | ||
23 | char *localnet = "localnet"; | |
24 | char *myname = "myname"; | |
25 | ||
26 | struct nlist nl[] = { | |
27 | #define NL_AVENRUN 0 | |
28 | { "_avenrun" }, | |
29 | #define NL_BOOTIME 1 | |
30 | { "_bootime" }, | |
31 | 0 | |
32 | }; | |
33 | ||
34 | struct whod mywd; | |
35 | int s, utmpf, kmemf = -1; | |
36 | ||
37 | int onalrm(); | |
38 | char *strcpy(), *sprintf(); | |
39 | long lseek(); | |
40 | int getkmem(); | |
41 | ||
42 | main() | |
43 | { | |
44 | struct sockaddr_in from; | |
45 | char path[64]; | |
46 | int addr; | |
a0f59ac1 | 47 | struct servent *sp; |
52b4fb0c | 48 | |
a0f59ac1 SL |
49 | sp = getservbyname("who", "udp"); |
50 | if (sp == 0) { | |
51 | fprintf(stderr, "rwhod: udp/who: unknown service\n"); | |
52 | exit(1); | |
53 | } | |
54 | #if vax || pdp11 | |
55 | sp->s_port = htons(sp->s_port); | |
56 | #endif | |
57 | sin.sin_port = sp->s_port; | |
52b4fb0c BJ |
58 | #ifndef DEBUG |
59 | if (fork()) | |
60 | exit(0); | |
61 | { int s; | |
62 | for (s = 0; s < 10; s++) | |
63 | (void) close(s); | |
64 | (void) open("/", 0); | |
65 | (void) dup2(0, 1); | |
66 | (void) dup2(0, 2); | |
67 | s = open("/dev/tty", 2); | |
68 | if (s >= 0) { | |
69 | ioctl(s, TIOCNOTTY, 0); | |
70 | (void) close(s); | |
71 | } | |
72 | } | |
73 | #endif | |
74 | (void) chdir("/dev"); | |
75 | (void) signal(SIGHUP, getkmem); | |
76 | if (getuid()) { | |
a0f59ac1 | 77 | fprintf(stderr, "rwhod: not super user\n"); |
52b4fb0c BJ |
78 | exit(1); |
79 | } | |
80 | addr = rhost(&localnet); | |
81 | if (addr == -1) { | |
a0f59ac1 | 82 | fprintf(stderr, "rwhod: no localnet\n"); |
52b4fb0c BJ |
83 | exit(1); |
84 | } | |
85 | sin.sin_addr.s_addr = addr; | |
86 | if (rhost(&myname) == -1) { | |
a0f59ac1 | 87 | fprintf(stderr, "rwhod: don't know \"myname\"\n"); |
52b4fb0c BJ |
88 | exit(1); |
89 | } | |
90 | strncpy(mywd.wd_hostname, myname, sizeof (mywd.wd_hostname) - 1); | |
91 | utmpf = open("/etc/utmp", 0); | |
92 | if (utmpf < 0) { | |
93 | (void) close(creat("/etc/utmp", 0644)); | |
94 | utmpf = open("/etc/utmp", 0); | |
95 | } | |
96 | if (utmpf < 0) { | |
a0f59ac1 | 97 | perror("rwhod: /etc/utmp"); |
52b4fb0c BJ |
98 | exit(1); |
99 | } | |
100 | getkmem(); | |
52b4fb0c BJ |
101 | again: |
102 | if ((s = socket(SOCK_DGRAM, 0, &sin, 0)) < 0) { | |
a0f59ac1 | 103 | perror("rwhod: socket"); |
52b4fb0c BJ |
104 | sleep(5); |
105 | goto again; | |
106 | } | |
107 | sigset(SIGALRM, onalrm); | |
108 | onalrm(); | |
109 | for (;;) { | |
110 | struct whod wd; | |
111 | int cc, whod; | |
112 | ||
113 | cc = receive(s, &from, (char *)&wd, sizeof (struct whod)); | |
114 | if (cc <= 0) { | |
115 | if (cc < 0 && errno != EINTR) | |
a0f59ac1 | 116 | perror("rwhod: receive"); |
52b4fb0c BJ |
117 | continue; |
118 | } | |
a0f59ac1 SL |
119 | if (from.sin_port != sp->s_port) { |
120 | fprintf(stderr, "rwhod: %d: bad from port\n", | |
121 | ntohs(from.sin_port)); | |
52b4fb0c BJ |
122 | continue; |
123 | } | |
a0f59ac1 SL |
124 | #ifdef notdef |
125 | if (gethostbyname(wd.wd_hostname) == 0) { | |
126 | fprintf(stderr, "rwhod: %s: unknown host\n", | |
127 | wd.wd_hostname); | |
128 | continue; | |
129 | } | |
130 | #endif | |
131 | if (!verify(wd.wd_hostname)) { | |
132 | fprintf(stderr, "rwhod: malformed host name from %x\n", | |
133 | from.sin_addr); | |
52b4fb0c BJ |
134 | continue; |
135 | } | |
52b4fb0c BJ |
136 | (void) sprintf(path, "/etc/whod.%s", wd.wd_hostname); |
137 | whod = creat(path, 0666); | |
138 | if (whod < 0) { | |
a0f59ac1 SL |
139 | fprintf(stderr, "rwhod: "); |
140 | perror(path); | |
52b4fb0c BJ |
141 | continue; |
142 | } | |
143 | (void) time(&wd.wd_recvtime); | |
144 | (void) write(whod, (char *)&wd, cc); | |
145 | (void) close(whod); | |
146 | } | |
147 | } | |
148 | ||
a0f59ac1 SL |
149 | /* |
150 | * Check out host name for unprintables | |
151 | * and other funnies before allowing a file | |
152 | * to be created. Sorry, but blanks aren't allowed. | |
153 | */ | |
154 | verify(name) | |
155 | register char *name; | |
156 | { | |
157 | register int size = 0; | |
158 | ||
159 | while (*name) { | |
160 | if (!isascii(*name) || !isalnum(*name)) | |
161 | return (0); | |
162 | name++, size++; | |
163 | } | |
164 | return (size > 0); | |
165 | } | |
166 | ||
52b4fb0c BJ |
167 | int utmptime; |
168 | int utmpent; | |
76886f32 | 169 | struct utmp utmp[100]; |
52b4fb0c BJ |
170 | int alarmcount; |
171 | ||
172 | onalrm() | |
173 | { | |
174 | register int i; | |
175 | struct stat stb; | |
76886f32 | 176 | register struct whoent *we = mywd.wd_we, *wlast; |
52b4fb0c BJ |
177 | int cc; |
178 | double avenrun[3]; | |
179 | time_t now = time(0); | |
180 | ||
181 | if (alarmcount % 10 == 0) | |
182 | getkmem(); | |
183 | alarmcount++; | |
184 | (void) fstat(utmpf, &stb); | |
185 | if (stb.st_mtime != utmptime) { | |
186 | (void) lseek(utmpf, (long)0, 0); | |
187 | cc = read(utmpf, (char *)utmp, sizeof (utmp)); | |
188 | if (cc < 0) { | |
189 | perror("/etc/utmp"); | |
190 | return; | |
191 | } | |
76886f32 | 192 | wlast = &mywd.wd_we[(1024 / sizeof (struct whoent)) - 1]; |
52b4fb0c BJ |
193 | utmpent = cc / sizeof (struct utmp); |
194 | for (i = 0; i < utmpent; i++) | |
195 | if (utmp[i].ut_name[0]) { | |
196 | we->we_utmp = utmp[i]; | |
76886f32 SL |
197 | if (we >= wlast) |
198 | break; | |
52b4fb0c BJ |
199 | we++; |
200 | } | |
201 | utmpent = we - mywd.wd_we; | |
202 | } | |
203 | we = mywd.wd_we; | |
204 | for (i = 0; i < utmpent; i++) { | |
205 | if (stat(we->we_utmp.ut_line, &stb) >= 0) | |
206 | we->we_idle = now - stb.st_atime; | |
207 | we++; | |
208 | } | |
209 | (void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, 0); | |
210 | (void) read(kmemf, (char *)avenrun, sizeof (avenrun)); | |
211 | for (i = 0; i < 3; i++) | |
212 | mywd.wd_loadav[i] = avenrun[i] * 100; | |
213 | cc = (char *)we - (char *)&mywd; | |
214 | (void) time(&mywd.wd_sendtime); | |
215 | send(s, &sin, (char *)&mywd, cc); | |
216 | (void) alarm(60); | |
217 | } | |
218 | ||
219 | getkmem() | |
220 | { | |
221 | struct nlist *nlp; | |
222 | ||
223 | signal(SIGHUP, getkmem); | |
224 | if (kmemf >= 0) | |
225 | (void) close(kmemf); | |
226 | loop: | |
227 | for (nlp = &nl[sizeof (nl) / sizeof (nl[0])]; --nlp >= nl; ) { | |
228 | nlp->n_value = 0; | |
229 | nlp->n_type = 0; | |
230 | } | |
231 | nlist("/vmunix", nl); | |
232 | if (nl[0].n_value == 0) { | |
233 | fprintf(stderr, "/vmunix namelist botch\n"); | |
234 | sleep(300); | |
235 | goto loop; | |
236 | } | |
237 | kmemf = open("/dev/kmem", 0); | |
238 | if (kmemf < 0) { | |
239 | perror("/dev/kmem"); | |
240 | sleep(300); | |
241 | goto loop; | |
242 | } | |
243 | (void) lseek(kmemf, (long)nl[NL_BOOTIME].n_value, 0); | |
244 | (void) read(kmemf, (char *)&mywd.wd_bootime, sizeof (mywd.wd_bootime)); | |
245 | } |