Commit | Line | Data |
---|---|---|
b9feeb00 | 1 | #ifndef lint |
329362bd | 2 | static char sccsid[] = "@(#)gettable.c 4.4 (Berkeley) %G%"; |
b9feeb00 SL |
3 | #endif |
4 | ||
5 | #include <sys/types.h> | |
6 | #include <sys/socket.h> | |
7 | ||
8 | #include <netinet/in.h> | |
9 | ||
10 | #include <stdio.h> | |
11 | #include <netdb.h> | |
12 | ||
13 | #define OUTFILE "hosts.txt" /* default output file */ | |
329362bd | 14 | #define VERFILE "hosts.ver" /* default version file */ |
b9feeb00 | 15 | #define QUERY "ALL\r\n" /* query to hostname server */ |
329362bd | 16 | #define VERSION "VERSION\r\n" /* get version number */ |
b9feeb00 SL |
17 | |
18 | #define equaln(s1, s2, n) (!strncmp(s1, s2, n)) | |
19 | ||
20 | struct sockaddr_in sin; | |
21 | char buf[BUFSIZ]; | |
22 | char *outfile = OUTFILE; | |
23 | ||
24 | main(argc, argv) | |
25 | int argc; | |
26 | char *argv[]; | |
27 | { | |
28 | int s; | |
29 | register len; | |
30 | register FILE *sfi, *sfo, *hf; | |
31 | register char *p; | |
32 | char *host; | |
33 | register struct hostent *hp; | |
34 | struct servent *sp; | |
329362bd | 35 | int version = 0; |
b9feeb00 SL |
36 | |
37 | argv++, argc--; | |
329362bd RC |
38 | if (**argv == '-') { |
39 | if (argv[0][1] != 'v') | |
40 | fprintf(stderr, "unknown option %s ignored\n", *argv); | |
41 | else | |
42 | version++, outfile = VERFILE; | |
43 | argv++, argc--; | |
44 | } | |
b9feeb00 | 45 | if (argc < 1 || argc > 2) { |
329362bd | 46 | fprintf(stderr, "usage: gettable [-v] host [ file ]\n"); |
b9feeb00 SL |
47 | exit(1); |
48 | } | |
e0754ba7 | 49 | sp = getservbyname("hostnames", "tcp"); |
b9feeb00 | 50 | if (sp == NULL) { |
e0754ba7 | 51 | fprintf(stderr, "gettable: hostnames/tcp: unknown service\n"); |
b9feeb00 SL |
52 | exit(3); |
53 | } | |
54 | host = *argv; | |
55 | argv++, argc--; | |
56 | hp = gethostbyname(host); | |
57 | if (hp == NULL) { | |
58 | fprintf(stderr, "gettable: %s: host unknown\n", host); | |
59 | exit(2); | |
60 | } | |
61 | host = hp->h_name; | |
62 | if (argc > 0) | |
63 | outfile = *argv; | |
64 | sin.sin_family = hp->h_addrtype; | |
65 | s = socket(hp->h_addrtype, SOCK_STREAM, 0, 0); | |
66 | if (s < 0) { | |
67 | perror("gettable: socket"); | |
68 | exit(4); | |
69 | } | |
70 | if (bind(s, &sin, sizeof (sin), 0) < 0) { | |
71 | perror("gettable: bind"); | |
72 | exit(5); | |
73 | } | |
74 | bcopy(hp->h_addr, &sin.sin_addr, hp->h_length); | |
75 | sin.sin_port = sp->s_port; | |
76 | if (connect(s, &sin, sizeof (sin), 0) < 0) { | |
77 | perror("gettable: connect"); | |
78 | exit(6); | |
79 | } | |
80 | fprintf(stderr, "Connection to %s opened.\n", host); | |
81 | sfi = fdopen(s, "r"); | |
82 | sfo = fdopen(s, "w"); | |
83 | if (sfi == NULL || sfo == NULL) { | |
84 | perror("gettable: fdopen"); | |
85 | close(s); | |
86 | exit(1); | |
87 | } | |
88 | hf = fopen(outfile, "w"); | |
89 | if (hf == NULL) { | |
90 | fprintf(stderr, "gettable: "); perror(outfile); | |
91 | close(s); | |
92 | exit(1); | |
93 | } | |
329362bd | 94 | fprintf(sfo, version ? VERSION : QUERY); |
b9feeb00 SL |
95 | fflush(sfo); |
96 | while (fgets(buf, sizeof(buf), sfi) != NULL) { | |
97 | len = strlen(buf); | |
98 | buf[len-2] = '\0'; | |
99 | if (equaln(buf, "BEGIN", 5) || equaln(buf, "END", 3)) { | |
100 | continue; | |
101 | } | |
102 | if (equaln(buf, "ERR", 3)) { | |
e0754ba7 | 103 | fprintf(stderr, "gettable: hostnames error: %s", buf); |
b9feeb00 SL |
104 | continue; |
105 | } | |
106 | fprintf(hf, "%s\n", buf); | |
107 | } | |
108 | fclose(hf); | |
329362bd RC |
109 | if (version) |
110 | fprintf(stderr, "Version number received.\n"); | |
111 | else | |
112 | fprintf(stderr, "Host table received.\n"); | |
b9feeb00 SL |
113 | close(s); |
114 | fprintf(stderr, "Connection to %s closed\n", host); | |
329362bd | 115 | exit(0); |
b9feeb00 | 116 | } |