| 1 | #include <stdio.h> |
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| 2 | #include <sys/types.h> |
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| 3 | #include <sys/socket.h> |
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| 4 | #include <netinet/in.h> |
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| 5 | #include <netdb.h> |
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| 6 | #include <hesiod.h> |
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| 7 | |
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| 8 | int net(progname, num, names) |
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| 9 | char *progname; |
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| 10 | int num; |
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| 11 | char **names; |
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| 12 | { |
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| 13 | static char *host; /* name of host running cview daemon. */ |
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| 14 | static char **serv; /* cview service hesiod info. */ |
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| 15 | static struct hostent *hp; /* hostent struct for cview server. */ |
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| 16 | static struct servent *sp; /* servent struct for cview service. */ |
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| 17 | static struct sockaddr_in sin; /* Socket address. */ |
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| 18 | static int init = 0; /* Have we been here before? */ |
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| 19 | int s; /* Socket to connect to cview daemon. */ |
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| 20 | int j; /* Counter. */ |
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| 21 | char buf[BUFSIZ]; /* Temporary buffer. */ |
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| 22 | |
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| 23 | if (!init) |
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| 24 | { |
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| 25 | #ifdef TEST |
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| 26 | host = "fries.mit.edu"; |
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| 27 | #else |
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| 28 | serv = hes_resolve("cview","sloc"); |
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| 29 | |
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| 30 | if (serv == NULL) |
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| 31 | host = "doghouse.mit.edu"; /* fall back if hesiod is broken... */ |
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| 32 | else |
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| 33 | host = *serv; |
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| 34 | #endif |
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| 35 | |
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| 36 | hp = gethostbyname(host); |
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| 37 | |
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| 38 | if (hp == NULL) |
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| 39 | { |
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| 40 | fprintf(stderr, "%s: Unable to resolve hostname '%s'.\n", |
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| 41 | progname, host); |
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| 42 | return(-1); |
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| 43 | } |
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| 44 | |
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| 45 | if (hp->h_length != sizeof(sin.sin_addr)) |
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| 46 | { |
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| 47 | fprintf(stderr, "%s: Unexpected h_length value for '%s'.\n", |
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| 48 | progname, host); |
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| 49 | return(-1); |
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| 50 | } |
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| 51 | |
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| 52 | sp = getservbyname("cview", "tcp"); |
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| 53 | if (sp == 0) |
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| 54 | { |
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| 55 | fprintf(stderr, "%s: Unknown service 'tcp/cview'.\n", progname); |
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| 56 | return(-1); |
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| 57 | } |
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| 58 | |
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| 59 | memset(&sin, 0, sizeof (sin)); |
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| 60 | memcpy(&sin.sin_addr, hp->h_addr, hp->h_length); |
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| 61 | sin.sin_family = hp->h_addrtype; |
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| 62 | sin.sin_port = sp->s_port; |
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| 63 | |
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| 64 | init = 1; |
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| 65 | } |
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| 66 | |
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| 67 | s = socket(hp->h_addrtype, SOCK_STREAM, 0); |
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| 68 | if (s < 0) |
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| 69 | { |
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| 70 | perror("socket"); |
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| 71 | return(-1); |
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| 72 | } |
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| 73 | |
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| 74 | if (connect(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) |
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| 75 | { |
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| 76 | perror("connect"); |
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| 77 | close(s); |
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| 78 | return(-1); |
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| 79 | } |
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| 80 | |
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| 81 | for (j=0; j<num; j++) |
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| 82 | { |
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| 83 | strncpy(buf, *names, sizeof(buf) - 2); |
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| 84 | buf[sizeof(buf) - 2] = '\0'; |
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| 85 | strcat(buf, " "); |
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| 86 | if (write(s, buf, strlen(buf)) == -1) |
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| 87 | { |
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| 88 | perror("write"); |
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| 89 | close(s); |
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| 90 | return(-1); |
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| 91 | } |
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| 92 | names++; |
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| 93 | } |
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| 94 | |
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| 95 | if (write(s, "\n", 1) == -1) |
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| 96 | { |
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| 97 | perror("write"); |
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| 98 | close(s); |
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| 99 | return(-1); |
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| 100 | } |
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| 101 | |
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| 102 | return(s); |
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| 103 | } |
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