1 | /* $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $ */ |
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2 | |
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3 | /* |
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4 | * Copyright (c) 1983, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * 3. All advertising materials mentioning features or use of this software |
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16 | * must display the following acknowledgement: |
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17 | * This product includes software developed by the University of |
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18 | * California, Berkeley and its contributors. |
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19 | * 4. Neither the name of the University nor the names of its contributors |
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20 | * may be used to endorse or promote products derived from this software |
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21 | * without specific prior written permission. |
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22 | * |
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23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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33 | * SUCH DAMAGE. |
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34 | */ |
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35 | |
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36 | #ifndef lint |
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37 | #if 0 |
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38 | static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; |
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39 | #endif |
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40 | static char rcsid[] = "$NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $"; |
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41 | #endif /* not lint */ |
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42 | |
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43 | #include <sys/types.h> |
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44 | #include <sys/socket.h> |
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45 | #include <sys/time.h> |
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46 | #include <netinet/in.h> |
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47 | #include <protocols/talkd.h> |
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48 | #include <errno.h> |
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49 | #include "talk_ctl.h" |
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50 | |
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51 | #define CTL_WAIT 2 /* time to wait for a response, in seconds */ |
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52 | |
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53 | /* |
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54 | * SOCKDGRAM is unreliable, so we must repeat messages if we have |
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55 | * not recieved an acknowledgement within a reasonable amount |
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56 | * of time |
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57 | */ |
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58 | ctl_transact(target, msg, type, rp) |
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59 | struct in_addr target; |
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60 | CTL_MSG msg; |
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61 | int type; |
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62 | CTL_RESPONSE *rp; |
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63 | { |
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64 | int read_mask, ctl_mask, nready, cc; |
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65 | struct timeval wait; |
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66 | |
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67 | msg.type = type; |
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68 | daemon_addr.sin_family = AF_INET; |
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69 | daemon_addr.sin_addr = target; |
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70 | daemon_addr.sin_port = daemon_port; |
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71 | ctl_mask = 1 << ctl_sockt; |
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72 | |
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73 | /* |
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74 | * Keep sending the message until a response of |
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75 | * the proper type is obtained. |
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76 | */ |
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77 | do { |
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78 | wait.tv_sec = CTL_WAIT; |
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79 | wait.tv_usec = 0; |
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80 | /* resend message until a response is obtained */ |
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81 | do { |
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82 | cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, |
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83 | (struct sockaddr *)&daemon_addr, |
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84 | sizeof (daemon_addr)); |
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85 | if (cc != sizeof (msg)) { |
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86 | if (errno == EINTR) |
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87 | continue; |
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88 | p_error("Error on write to talk daemon"); |
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89 | } |
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90 | read_mask = ctl_mask; |
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91 | nready = select(32, &read_mask, 0, 0, &wait); |
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92 | if (nready < 0) { |
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93 | if (errno == EINTR) |
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94 | continue; |
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95 | p_error("Error waiting for daemon response"); |
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96 | } |
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97 | } while (nready == 0); |
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98 | /* |
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99 | * Keep reading while there are queued messages |
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100 | * (this is not necessary, it just saves extra |
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101 | * request/acknowledgements being sent) |
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102 | */ |
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103 | do { |
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104 | cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); |
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105 | if (cc < 0) { |
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106 | if (errno == EINTR) |
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107 | continue; |
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108 | p_error("Error on read from talk daemon"); |
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109 | } |
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110 | read_mask = ctl_mask; |
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111 | /* an immediate poll */ |
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112 | timerclear(&wait); |
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113 | nready = select(32, &read_mask, 0, 0, &wait); |
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114 | } while (nready > 0 && (rp->vers != TALK_VERSION || |
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115 | rp->type != type)); |
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116 | } while (rp->vers != TALK_VERSION || rp->type != type); |
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117 | rp->id_num = ntohl(rp->id_num); |
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118 | rp->addr.family = ntohs(rp->addr.family); |
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119 | } |
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