Commit | Line | Data |
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52b4fb0c | 1 | #ifndef lint |
a82aa56a | 2 | static char sccsid[] = "@(#)rwhod.c 4.7 82/12/24"; |
52b4fb0c BJ |
3 | #endif |
4 | ||
52b4fb0c | 5 | #include <sys/types.h> |
52b4fb0c | 6 | #include <sys/socket.h> |
52b4fb0c | 7 | #include <sys/stat.h> |
52b4fb0c | 8 | #include <sys/ioctl.h> |
de3b21e8 SL |
9 | |
10 | #include <netinet/in.h> | |
11 | ||
12 | #include <nlist.h> | |
13 | #include <stdio.h> | |
14 | #include <signal.h> | |
15 | #include <errno.h> | |
16 | #include <utmp.h> | |
a0f59ac1 SL |
17 | #include <ctype.h> |
18 | #include <netdb.h> | |
52b4fb0c | 19 | |
de3b21e8 SL |
20 | #include "rwhod.h" |
21 | ||
a0f59ac1 | 22 | struct sockaddr_in sin = { AF_INET }; |
52b4fb0c BJ |
23 | |
24 | extern errno; | |
25 | ||
26 | char *localnet = "localnet"; | |
27 | char *myname = "myname"; | |
28 | ||
29 | struct nlist nl[] = { | |
30 | #define NL_AVENRUN 0 | |
31 | { "_avenrun" }, | |
de3b21e8 SL |
32 | #define NL_BOOTTIME 1 |
33 | { "_boottime" }, | |
52b4fb0c BJ |
34 | 0 |
35 | }; | |
36 | ||
37 | struct whod mywd; | |
38 | int s, utmpf, kmemf = -1; | |
39 | ||
40 | int onalrm(); | |
41 | char *strcpy(), *sprintf(); | |
42 | long lseek(); | |
43 | int getkmem(); | |
44 | ||
45 | main() | |
46 | { | |
47 | struct sockaddr_in from; | |
48 | char path[64]; | |
49 | int addr; | |
a0f59ac1 | 50 | struct servent *sp; |
52b4fb0c | 51 | |
a0f59ac1 SL |
52 | sp = getservbyname("who", "udp"); |
53 | if (sp == 0) { | |
54 | fprintf(stderr, "rwhod: udp/who: unknown service\n"); | |
55 | exit(1); | |
56 | } | |
52b4fb0c BJ |
57 | #ifndef DEBUG |
58 | if (fork()) | |
59 | exit(0); | |
60 | { int s; | |
61 | for (s = 0; s < 10; s++) | |
62 | (void) close(s); | |
63 | (void) open("/", 0); | |
64 | (void) dup2(0, 1); | |
65 | (void) dup2(0, 2); | |
66 | s = open("/dev/tty", 2); | |
67 | if (s >= 0) { | |
68 | ioctl(s, TIOCNOTTY, 0); | |
69 | (void) close(s); | |
70 | } | |
71 | } | |
72 | #endif | |
73 | (void) chdir("/dev"); | |
74 | (void) signal(SIGHUP, getkmem); | |
75 | if (getuid()) { | |
a0f59ac1 | 76 | fprintf(stderr, "rwhod: not super user\n"); |
52b4fb0c BJ |
77 | exit(1); |
78 | } | |
79 | addr = rhost(&localnet); | |
80 | if (addr == -1) { | |
a0f59ac1 | 81 | fprintf(stderr, "rwhod: no localnet\n"); |
52b4fb0c BJ |
82 | exit(1); |
83 | } | |
84 | sin.sin_addr.s_addr = addr; | |
85 | if (rhost(&myname) == -1) { | |
a0f59ac1 | 86 | fprintf(stderr, "rwhod: don't know \"myname\"\n"); |
52b4fb0c BJ |
87 | exit(1); |
88 | } | |
89 | strncpy(mywd.wd_hostname, myname, sizeof (mywd.wd_hostname) - 1); | |
90 | utmpf = open("/etc/utmp", 0); | |
91 | if (utmpf < 0) { | |
92 | (void) close(creat("/etc/utmp", 0644)); | |
93 | utmpf = open("/etc/utmp", 0); | |
94 | } | |
95 | if (utmpf < 0) { | |
a0f59ac1 | 96 | perror("rwhod: /etc/utmp"); |
52b4fb0c BJ |
97 | exit(1); |
98 | } | |
de3b21e8 | 99 | sin.sin_port = sp->s_port; |
52b4fb0c | 100 | getkmem(); |
85b11450 | 101 | if ((s = socket(AF_INET, SOCK_DGRAM, 0, 0)) < 0) { |
a0f59ac1 | 102 | perror("rwhod: socket"); |
de3b21e8 SL |
103 | exit(1); |
104 | } | |
105 | if (bind(s, &sin, sizeof (sin), 0) < 0) { | |
106 | perror("rwhod: bind"); | |
107 | exit(1); | |
52b4fb0c BJ |
108 | } |
109 | sigset(SIGALRM, onalrm); | |
110 | onalrm(); | |
111 | for (;;) { | |
112 | struct whod wd; | |
de3b21e8 | 113 | int cc, whod, len=sizeof (from); |
52b4fb0c | 114 | |
de3b21e8 | 115 | cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0, &from, &len); |
52b4fb0c BJ |
116 | if (cc <= 0) { |
117 | if (cc < 0 && errno != EINTR) | |
de3b21e8 | 118 | perror("rwhod: recv"); |
52b4fb0c BJ |
119 | continue; |
120 | } | |
a0f59ac1 SL |
121 | if (from.sin_port != sp->s_port) { |
122 | fprintf(stderr, "rwhod: %d: bad from port\n", | |
123 | ntohs(from.sin_port)); | |
52b4fb0c BJ |
124 | continue; |
125 | } | |
a0f59ac1 SL |
126 | #ifdef notdef |
127 | if (gethostbyname(wd.wd_hostname) == 0) { | |
128 | fprintf(stderr, "rwhod: %s: unknown host\n", | |
129 | wd.wd_hostname); | |
130 | continue; | |
131 | } | |
132 | #endif | |
133 | if (!verify(wd.wd_hostname)) { | |
134 | fprintf(stderr, "rwhod: malformed host name from %x\n", | |
135 | from.sin_addr); | |
52b4fb0c BJ |
136 | continue; |
137 | } | |
a82aa56a | 138 | (void) sprintf(path, "%s/whod.%s", RWHODIR, wd.wd_hostname); |
52b4fb0c BJ |
139 | whod = creat(path, 0666); |
140 | if (whod < 0) { | |
a0f59ac1 SL |
141 | fprintf(stderr, "rwhod: "); |
142 | perror(path); | |
52b4fb0c BJ |
143 | continue; |
144 | } | |
145 | (void) time(&wd.wd_recvtime); | |
146 | (void) write(whod, (char *)&wd, cc); | |
147 | (void) close(whod); | |
148 | } | |
149 | } | |
150 | ||
a0f59ac1 SL |
151 | /* |
152 | * Check out host name for unprintables | |
153 | * and other funnies before allowing a file | |
154 | * to be created. Sorry, but blanks aren't allowed. | |
155 | */ | |
156 | verify(name) | |
157 | register char *name; | |
158 | { | |
159 | register int size = 0; | |
160 | ||
161 | while (*name) { | |
162 | if (!isascii(*name) || !isalnum(*name)) | |
163 | return (0); | |
164 | name++, size++; | |
165 | } | |
166 | return (size > 0); | |
167 | } | |
168 | ||
52b4fb0c BJ |
169 | int utmptime; |
170 | int utmpent; | |
76886f32 | 171 | struct utmp utmp[100]; |
52b4fb0c BJ |
172 | int alarmcount; |
173 | ||
174 | onalrm() | |
175 | { | |
176 | register int i; | |
177 | struct stat stb; | |
76886f32 | 178 | register struct whoent *we = mywd.wd_we, *wlast; |
52b4fb0c BJ |
179 | int cc; |
180 | double avenrun[3]; | |
181 | time_t now = time(0); | |
182 | ||
183 | if (alarmcount % 10 == 0) | |
184 | getkmem(); | |
185 | alarmcount++; | |
186 | (void) fstat(utmpf, &stb); | |
187 | if (stb.st_mtime != utmptime) { | |
188 | (void) lseek(utmpf, (long)0, 0); | |
189 | cc = read(utmpf, (char *)utmp, sizeof (utmp)); | |
190 | if (cc < 0) { | |
191 | perror("/etc/utmp"); | |
192 | return; | |
193 | } | |
76886f32 | 194 | wlast = &mywd.wd_we[(1024 / sizeof (struct whoent)) - 1]; |
52b4fb0c BJ |
195 | utmpent = cc / sizeof (struct utmp); |
196 | for (i = 0; i < utmpent; i++) | |
197 | if (utmp[i].ut_name[0]) { | |
198 | we->we_utmp = utmp[i]; | |
76886f32 SL |
199 | if (we >= wlast) |
200 | break; | |
52b4fb0c BJ |
201 | we++; |
202 | } | |
203 | utmpent = we - mywd.wd_we; | |
204 | } | |
205 | we = mywd.wd_we; | |
206 | for (i = 0; i < utmpent; i++) { | |
207 | if (stat(we->we_utmp.ut_line, &stb) >= 0) | |
208 | we->we_idle = now - stb.st_atime; | |
209 | we++; | |
210 | } | |
211 | (void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, 0); | |
212 | (void) read(kmemf, (char *)avenrun, sizeof (avenrun)); | |
213 | for (i = 0; i < 3; i++) | |
214 | mywd.wd_loadav[i] = avenrun[i] * 100; | |
215 | cc = (char *)we - (char *)&mywd; | |
216 | (void) time(&mywd.wd_sendtime); | |
de3b21e8 | 217 | (void) sendto(s, (char *)&mywd, cc, 0, &sin, sizeof (sin)); |
52b4fb0c BJ |
218 | (void) alarm(60); |
219 | } | |
220 | ||
221 | getkmem() | |
222 | { | |
223 | struct nlist *nlp; | |
224 | ||
225 | signal(SIGHUP, getkmem); | |
226 | if (kmemf >= 0) | |
227 | (void) close(kmemf); | |
228 | loop: | |
229 | for (nlp = &nl[sizeof (nl) / sizeof (nl[0])]; --nlp >= nl; ) { | |
230 | nlp->n_value = 0; | |
231 | nlp->n_type = 0; | |
232 | } | |
233 | nlist("/vmunix", nl); | |
234 | if (nl[0].n_value == 0) { | |
235 | fprintf(stderr, "/vmunix namelist botch\n"); | |
236 | sleep(300); | |
237 | goto loop; | |
238 | } | |
239 | kmemf = open("/dev/kmem", 0); | |
240 | if (kmemf < 0) { | |
241 | perror("/dev/kmem"); | |
242 | sleep(300); | |
243 | goto loop; | |
244 | } | |
de3b21e8 SL |
245 | (void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, 0); |
246 | (void) read(kmemf, (char *)&mywd.wd_boottime, sizeof (mywd.wd_boottime)); | |
52b4fb0c | 247 | } |