annotate listener.c @ 1079:acf444bcb115

Fix no-writev fallback
author Matt Johnston <matt@ucc.asn.au>
date Sat, 02 May 2015 22:47:25 +0800
parents 2b4fd440399d
children 06d52bcb8094
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "listener.h"
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27 #include "session.h"
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28 #include "dbutil.h"
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29
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30 void listeners_initialise() {
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31
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32 /* just one slot to start with */
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33 ses.listeners = (struct Listener**)m_malloc(sizeof(struct Listener*));
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34 ses.listensize = 1;
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35 ses.listeners[0] = NULL;
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36
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37 }
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38
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39 void set_listener_fds(fd_set * readfds) {
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40
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41 unsigned int i, j;
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42 struct Listener *listener;
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43
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44 /* check each in turn */
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45 for (i = 0; i < ses.listensize; i++) {
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46 listener = ses.listeners[i];
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47 if (listener != NULL) {
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48 for (j = 0; j < listener->nsocks; j++) {
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49 FD_SET(listener->socks[j], readfds);
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50 }
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51 }
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52 }
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53 }
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55
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56 void handle_listeners(fd_set * readfds) {
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57
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58 unsigned int i, j;
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59 struct Listener *listener;
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60 int sock;
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61
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62 /* check each in turn */
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63 for (i = 0; i < ses.listensize; i++) {
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64 listener = ses.listeners[i];
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65 if (listener != NULL) {
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66 for (j = 0; j < listener->nsocks; j++) {
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67 sock = listener->socks[j];
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68 if (FD_ISSET(sock, readfds)) {
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69 listener->acceptor(listener, sock);
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70 }
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71 }
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72 }
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73 }
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74 } /* Woo brace matching */
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77 /* acceptor(int fd, void* typedata) is a function to accept connections,
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78 * cleanup(void* typedata) happens when cleaning up */
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79 struct Listener* new_listener(int socks[], unsigned int nsocks,
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80 int type, void* typedata,
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81 void (*acceptor)(struct Listener* listener, int sock),
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82 void (*cleanup)(struct Listener*)) {
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83
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84 unsigned int i, j;
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85 struct Listener *newlisten = NULL;
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86 /* try get a new structure to hold it */
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87 for (i = 0; i < ses.listensize; i++) {
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88 if (ses.listeners[i] == NULL) {
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89 break;
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90 }
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91 }
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92
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93 /* or create a new one */
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94 if (i == ses.listensize) {
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95 if (ses.listensize > MAX_LISTENERS) {
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96 TRACE(("leave newlistener: too many already"))
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97 for (j = 0; j < nsocks; j++) {
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98 close(socks[i]);
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99 }
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100 return NULL;
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101 }
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102
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103 ses.listeners = (struct Listener**)m_realloc(ses.listeners,
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104 (ses.listensize+LISTENER_EXTEND_SIZE)
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105 *sizeof(struct Listener*));
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106
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107 ses.listensize += LISTENER_EXTEND_SIZE;
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108
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109 for (j = i; j < ses.listensize; j++) {
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110 ses.listeners[j] = NULL;
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111 }
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112 }
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113
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114 for (j = 0; j < nsocks; j++) {
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115 ses.maxfd = MAX(ses.maxfd, socks[j]);
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116 }
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117
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118 TRACE(("new listener num %d ", i))
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119
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120 newlisten = (struct Listener*)m_malloc(sizeof(struct Listener));
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121 newlisten->index = i;
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122 newlisten->type = type;
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123 newlisten->typedata = typedata;
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124 newlisten->nsocks = nsocks;
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125 memcpy(newlisten->socks, socks, nsocks * sizeof(int));
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126 newlisten->acceptor = acceptor;
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127 newlisten->cleanup = cleanup;
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128
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129 ses.listeners[i] = newlisten;
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130 return newlisten;
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131 }
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132
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133 /* Return the first listener which matches the type-specific comparison
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134 * function. Particularly needed for global requests, like tcp */
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135 struct Listener * get_listener(int type, void* typedata,
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136 int (*match)(void*, void*)) {
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137
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138 unsigned int i;
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139 struct Listener* listener;
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140
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141 for (i = 0, listener = ses.listeners[i]; i < ses.listensize; i++) {
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142 if (listener->type == type
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143 && match(typedata, listener->typedata)) {
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144 return listener;
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145 }
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146 }
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147
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148 return NULL;
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149 }
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150
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151 void remove_listener(struct Listener* listener) {
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152
62
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diff changeset
153 unsigned int j;
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154
9
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155 if (listener->cleanup) {
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156 listener->cleanup(listener);
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157 }
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158
62
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parents: 13
diff changeset
159 for (j = 0; j < listener->nsocks; j++) {
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diff changeset
160 close(listener->socks[j]);
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diff changeset
161 }
9
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162 ses.listeners[listener->index] = NULL;
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163 m_free(listener);
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
164 }
9
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165
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
166 void remove_all_listeners(void) {
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
167 unsigned int i;
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
168 for (i = 0; i < ses.listensize; i++) {
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
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parents: 165
diff changeset
169 if (ses.listeners[i]) {
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parents: 165
diff changeset
170 remove_listener(ses.listeners[i]);
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parents: 165
diff changeset
171 }
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
172 }
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
173 m_free(ses.listeners);
9
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diff changeset
174 }