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1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.redist.c% | |
6 | */ | |
7 | ||
8 | #ifndef lint | |
2f339969 | 9 | static char sccsid[] = "@(#)netdate.c 5.2 (Berkeley) %G%"; |
927c4ffc KB |
10 | #endif /* not lint */ |
11 | ||
12 | #include <sys/param.h> | |
13 | #include <sys/time.h> | |
14 | #include <sys/socket.h> | |
15 | #include <sys/errno.h> | |
16 | #include <netinet/in.h> | |
17 | #include <netdb.h> | |
18 | #define TSPTYPES | |
19 | #include <protocols/timed.h> | |
2f339969 | 20 | #include <unistd.h> |
927c4ffc | 21 | #include <stdio.h> |
2f339969 | 22 | #include <string.h> |
927c4ffc KB |
23 | |
24 | #define WAITACK 2 /* seconds */ | |
25 | #define WAITDATEACK 5 /* seconds */ | |
26 | ||
27 | extern int retval; | |
28 | ||
29 | /* | |
30 | * Set the date in the machines controlled by timedaemons by communicating the | |
31 | * new date to the local timedaemon. If the timedaemon is in the master state, | |
32 | * it performs the correction on all slaves. If it is in the slave state, it | |
33 | * notifies the master that a correction is needed. | |
34 | * Returns 0 on success. Returns > 0 on failure, setting retval to 2; | |
35 | */ | |
36 | netsettime(tval) | |
37 | time_t tval; | |
38 | { | |
39 | struct timeval tout; | |
40 | struct servent *sp; | |
41 | struct tsp msg; | |
42 | struct sockaddr_in sin, dest, from; | |
43 | fd_set ready; | |
44 | long waittime; | |
45 | int s, length, port, timed_ack, found, err; | |
46 | char hostname[MAXHOSTNAMELEN]; | |
47 | ||
48 | if ((sp = getservbyname("timed", "udp")) == NULL) { | |
49 | (void)fprintf(stderr, "date: udp/timed: unknown service.n"); | |
50 | return (retval = 2); | |
51 | } | |
52 | ||
53 | dest.sin_port = sp->s_port; | |
54 | dest.sin_family = AF_INET; | |
55 | dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY); | |
56 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
57 | if (s < 0) { | |
58 | if (errno != EPROTONOSUPPORT) | |
59 | perror("date: timed"); | |
60 | return(retval = 2); | |
61 | } | |
62 | ||
63 | bzero((char *)&sin, sizeof(sin)); | |
64 | sin.sin_family = AF_INET; | |
65 | for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) { | |
66 | sin.sin_port = htons((u_short)port); | |
67 | if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) | |
68 | break; | |
69 | if (errno == EADDRINUSE) | |
70 | continue; | |
71 | if (errno != EADDRNOTAVAIL) | |
72 | perror("date: bind"); | |
73 | goto bad; | |
74 | } | |
75 | if (port == IPPORT_RESERVED / 2) { | |
76 | (void)fprintf(stderr, "date: all ports in use.\n"); | |
77 | goto bad; | |
78 | } | |
79 | msg.tsp_type = TSP_SETDATE; | |
80 | msg.tsp_vers = TSPVERSION; | |
81 | if (gethostname(hostname, sizeof(hostname))) { | |
82 | perror("date: gethostname"); | |
83 | goto bad; | |
84 | } | |
85 | (void)strncpy(msg.tsp_name, hostname, sizeof(hostname)); | |
86 | msg.tsp_seq = htons((u_short)0); | |
87 | msg.tsp_time.tv_sec = htonl((u_long)tval); | |
88 | msg.tsp_time.tv_usec = htonl((u_long)0); | |
89 | length = sizeof(struct sockaddr_in); | |
2f339969 | 90 | if (connect(s, (struct sockaddr *)&dest, length) < 0) { |
927c4ffc KB |
91 | perror("date: connect"); |
92 | goto bad; | |
93 | } | |
94 | if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) { | |
95 | if (errno != ECONNREFUSED) | |
96 | perror("date: send"); | |
97 | goto bad; | |
98 | } | |
99 | ||
100 | timed_ack = -1; | |
101 | waittime = WAITACK; | |
102 | loop: | |
103 | tout.tv_sec = waittime; | |
104 | tout.tv_usec = 0; | |
105 | ||
106 | FD_ZERO(&ready); | |
107 | FD_SET(s, &ready); | |
108 | found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout); | |
109 | ||
110 | length = sizeof(err); | |
111 | if (!getsockopt(s, SOL_SOCKET, SO_ERROR, (char *)&err, &length) | |
112 | && err) { | |
113 | if (err != ECONNREFUSED) | |
114 | perror("date: send (delayed error)"); | |
115 | goto bad; | |
116 | } | |
117 | ||
118 | if (found > 0 && FD_ISSET(s, &ready)) { | |
119 | length = sizeof(struct sockaddr_in); | |
2f339969 KB |
120 | if (recvfrom(s, &msg, sizeof(struct tsp), 0, |
121 | (struct sockaddr *)&from, &length) < 0) { | |
927c4ffc KB |
122 | if (errno != ECONNREFUSED) |
123 | perror("date: recvfrom"); | |
124 | goto bad; | |
125 | } | |
126 | msg.tsp_seq = ntohs(msg.tsp_seq); | |
127 | msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); | |
128 | msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); | |
129 | switch (msg.tsp_type) { | |
130 | case TSP_ACK: | |
131 | timed_ack = TSP_ACK; | |
132 | waittime = WAITDATEACK; | |
133 | goto loop; | |
134 | case TSP_DATEACK: | |
135 | (void)close(s); | |
136 | return (0); | |
137 | default: | |
138 | (void)fprintf(stderr, | |
139 | "date: wrong ack received from timed: %s.\n", | |
140 | tsptype[msg.tsp_type]); | |
141 | timed_ack = -1; | |
142 | break; | |
143 | } | |
144 | } | |
145 | if (timed_ack == -1) | |
146 | (void)fprintf(stderr, | |
147 | "date: can't reach time daemon, time set locally.\n"); | |
148 | ||
149 | bad: | |
150 | (void)close(s); | |
151 | return(retval = 2); | |
152 | } |