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annotate tcpfwd.c @ 4:fe6bca95afa7

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Makefile.in contains updated files required
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
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4
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1 #include "includes.h"
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2 #include "tcpfwd.h"
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3 #include "session.h"
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4 #include "dbutil.h"
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5
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6 void tcp_fwd_initialise() {
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7
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8 /* just one slot to start with */
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9 ses.tcplisteners =
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10 (struct TCPListener**)m_malloc(sizeof(struct TCPListener*));
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11 ses.tcplistensize = 1;
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12 ses.tcplisteners[0] = NULL;
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13
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14 }
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15
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16 void set_tcp_fwd_fds(fd_set * readfds) {
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17
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18 unsigned int i;
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19 struct TCPListener *listener;
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20
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21 /* check each in turn */
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22 for (i = 0; i < ses.tcplistensize; i++) {
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23 listener = ses.tcplisteners[i];
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24 if (listener != NULL) {
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25 FD_SET(listener->sock, readfds);
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26 }
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27 }
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28 }
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29
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30
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31 void handle_tcp_fwd(fd_set * readfds) {
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32
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33 unsigned int i;
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34 struct TCPListener *listener;
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35
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36 /* check each in turn */
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37 for (i = 0; i < ses.tcplistensize; i++) {
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38 listener = ses.tcplisteners[i];
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39 if (listener != NULL) {
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40 if (FD_ISSET(listener->sock, readfds)) {
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41 listener->accepter(listener);
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42 }
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43 }
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44 }
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45 }
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46
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47
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48 /* accepter(int fd, void* typedata) is a function to accept connections,
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49 * cleanup(void* typedata) happens when cleaning up */
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50 int new_fwd(int sock, int type, void* typedata,
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51 void (*accepter)(struct TCPListener*),
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52 void (*cleanup)(struct TCPListener*)) {
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53
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54 unsigned int i, j;
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55 struct TCPListener *newtcp = NULL;
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56 /* try get a new structure to hold it */
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57 for (i = 0; i < ses.tcplistensize; i++) {
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58 if (ses.tcplisteners[i] == NULL) {
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59 break;
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60 }
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61 }
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62
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63 /* or create a new one */
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64 if (i == ses.tcplistensize) {
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65 if (ses.tcplistensize > MAX_TCPLISTENERS) {
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66 TRACE(("leave newlistener: too many already"));
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67 close(sock);
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68 return DROPBEAR_FAILURE;
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69 }
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70
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71 ses.tcplisteners = (struct TCPListener**)m_realloc(ses.tcplisteners,
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72 (ses.tcplistensize+TCP_EXTEND_SIZE)
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73 *sizeof(struct TCPListener*));
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74
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75 ses.tcplistensize += TCP_EXTEND_SIZE;
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76
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77 for (j = i; j < ses.tcplistensize; j++) {
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78 ses.tcplisteners[j] = NULL;
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79 }
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80 }
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81
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82 ses.maxfd = MAX(ses.maxfd, sock);
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83
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84 newtcp = (struct TCPListener*)m_malloc(sizeof(struct TCPListener));
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85 newtcp->index = i;
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86 newtcp->type = type;
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87 newtcp->typedata = typedata;
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88 newtcp->sock = sock;
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89 newtcp->accepter = accepter;
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90 newtcp->cleanup = cleanup;
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91
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92 ses.tcplisteners[i] = newtcp;
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93 return DROPBEAR_SUCCESS;
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94 }
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95
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96 /* Return the first listener which matches the type-specific comparison
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97 * function */
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98 struct TCPListener * get_listener(int type, void* typedata,
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99 int (*match)(void*, void*)) {
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100
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101 unsigned int i;
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102 struct TCPListener* listener;
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103
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104 for (i = 0, listener = ses.tcplisteners[i]; i < ses.tcplistensize; i++) {
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105 if (listener->type == type
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106 && match(typedata, listener->typedata)) {
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107 return listener;
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108 }
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109 }
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110
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111 return NULL;
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112 }
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113
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114 void remove_listener(struct TCPListener* listener) {
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115
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116 if (listener->cleanup) {
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117 listener->cleanup(listener);
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118 }
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119
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120 close(listener->sock);
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121 ses.tcplisteners[listener->index] = NULL;
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122 m_free(listener);
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123
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124 }