| 1 | #ifndef lint |
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| 2 | static char *sccsid = "@(#)tcp_conn.c 4.1 ULTRIX 9/13/88"; |
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| 3 | #endif |
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| 4 | |
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| 5 | #include "lp.h" |
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| 6 | |
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| 7 | /* |
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| 8 | * T C P _ c o n n |
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| 9 | * |
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| 10 | * Create a TCP connection to the remote printer server. |
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| 11 | * |
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| 12 | * Inputs: char *rhost; |
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| 13 | * Outputs: none |
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| 14 | * Returns: FD open on network printer |
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| 15 | * |
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| 16 | * The string "rhost" is expected to be something like "decwrl", or |
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| 17 | * "decwrl.dec.com", or "decwrl.dec.com/servicename". If the / is present, |
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| 18 | * then the string following it is the name of the service, to be looked |
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| 19 | * up in /etc/services. If no name is provided (the / is absent), then |
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| 20 | * the service "printserver" is assumed. |
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| 21 | * |
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| 22 | */ |
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| 23 | tcp_conn(rhost) |
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| 24 | char *rhost; |
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| 25 | { |
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| 26 | struct hostent *hp; |
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| 27 | struct servent *sp; |
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| 28 | struct sockaddr_in sin; |
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| 29 | int s, retries, aval; |
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| 30 | int err; |
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| 31 | char hostString[512]; |
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| 32 | char serviceName[512]; |
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| 33 | |
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| 34 | extern int sys_nerr; |
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| 35 | extern char *sys_errlist[]; |
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| 36 | |
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| 37 | /* |
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| 38 | * Get the host address and port number to connect to. |
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| 39 | */ |
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| 40 | strcpy(serviceName,"printserver"); |
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| 41 | sscanf(rhost,"%[^/]/%[^/]", hostString, serviceName); |
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| 42 | bzero((char *)&sin, sizeof(sin)); |
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| 43 | |
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| 44 | aval = inet_addr(hostString); |
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| 45 | if (aval != -1) { |
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| 46 | sin.sin_addr.s_addr = aval; |
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| 47 | } else { |
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| 48 | hp = gethostbyname(hostString); |
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| 49 | if (hp == (struct hostent *) NULL) |
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| 50 | fatal("unknown host %s", hostString); |
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| 51 | sin.sin_addr.s_addr = *(int *) hp->h_addr; |
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| 52 | } |
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| 53 | sp = getservbyname(serviceName, "tcp"); |
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| 54 | if (sp == (struct servent *) NULL) |
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| 55 | fatal("Service '%s/tcp' not defined. Fix /etc/services.",serviceName); |
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| 56 | sin.sin_family = AF_INET; |
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| 57 | sin.sin_port = sp->s_port; |
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| 58 | |
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| 59 | if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) { |
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| 60 | if ((errno > 0) && (errno <= sys_nerr)) |
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| 61 | fatal("Can't get socket: %s",sys_errlist[errno]); |
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| 62 | else fatal("Can't get socket, errno=%d",errno); |
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| 63 | } |
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| 64 | retries = 0; |
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| 65 | while (1) { |
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| 66 | if (connect(s, (caddr_t)&sin, sizeof(sin)) < 0) { |
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| 67 | err = errno; |
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| 68 | close(s); |
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| 69 | retries = (retries > 5) ? 6 : retries+1; |
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| 70 | status("Trying to connect to %s",hostString); |
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| 71 | if (err == ECONNREFUSED) sleep(1<<retries); |
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| 72 | } else |
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| 73 | return(s); |
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| 74 | } |
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| 75 | } |
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| 76 | |
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| 77 | /*VARARGS1*/ |
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| 78 | static |
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| 79 | status(msg, a1, a2, a3) |
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| 80 | char *msg; |
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| 81 | { |
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| 82 | register int fd; |
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| 83 | char buf[BUFSIZ]; |
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| 84 | |
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| 85 | umask(0); |
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| 86 | fd = open(ST, O_WRONLY|O_CREAT, 0664); |
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| 87 | if (fd < 0 || flock(fd, LOCK_EX) < 0) |
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| 88 | fatal("cannot create status file"); |
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| 89 | ftruncate(fd, 0); |
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| 90 | sprintf(buf, msg, a1, a2, a3); |
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| 91 | strcat(buf, "\n"); |
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| 92 | (void) write(fd, buf, strlen(buf)); |
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| 93 | (void) close(fd); |
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| 94 | } |
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| 95 | |
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