Mercurial > dropbear

annotate tcpfwd-direct.c @ 53:0fe267cc9dee

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Be a bit safer with reentrant pw_name
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 Aug 2004 16:41:26 +0000
parents 0969767bca0d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
1 #include "includes.h"
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2 #include "session.h"
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3 #include "dbutil.h"
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4 #include "channel.h"
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5 #include "tcpfwd-direct.h"
24
469950e86d0f switching to global vars
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6 #include "runopts.h"
9
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7
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8 #ifndef DISABLE_TCPFWD_DIRECT
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9 static int newtcpdirect(struct Channel * channel);
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10 static int newtcp(const char * host, int port);
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11
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12 const struct ChanType chan_tcpdirect = {
11
f76c9389e9e0 Mostly done with the listener changeover
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13 1, /* sepfds */
9
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14 "direct-tcpip",
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15 newtcpdirect, /* init */
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16 NULL, /* checkclose */
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17 NULL, /* reqhandler */
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18 NULL /* closehandler */
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19 };
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20
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21
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22 /* Called upon creating a new direct tcp channel (ie we connect out to an
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23 * address */
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24 static int newtcpdirect(struct Channel * channel) {
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25
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26 unsigned char* desthost = NULL;
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27 unsigned int destport;
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28 unsigned char* orighost = NULL;
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29 unsigned int origport;
26
0969767bca0d snapshot of stuff
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30 char portstring[6];
9
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31 int sock;
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32 int len;
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33 int ret = DROPBEAR_FAILURE;
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34
24
469950e86d0f switching to global vars
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35 if (opts.nolocaltcp) {
9
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36 TRACE(("leave newtcpdirect: local tcp forwarding disabled"));
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37 goto out;
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38 }
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39
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40 desthost = buf_getstring(ses.payload, &len);
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41 if (len > MAX_HOST_LEN) {
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42 TRACE(("leave newtcpdirect: desthost too long"));
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43 goto out;
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44 }
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45
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46 destport = buf_getint(ses.payload);
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47
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48 orighost = buf_getstring(ses.payload, &len);
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49 if (len > MAX_HOST_LEN) {
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50 TRACE(("leave newtcpdirect: orighost too long"));
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51 goto out;
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52 }
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53
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54 origport = buf_getint(ses.payload);
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55
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56 /* best be sure */
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57 if (origport > 65535 || destport > 65535) {
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58 TRACE(("leave newtcpdirect: port > 65535"));
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59 goto out;
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60 }
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61
26
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62 snprintf(portstring, sizeof(portstring), "%d", destport);
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63 sock = connect_remote(desthost, portstring, 1, NULL);
9
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64 if (sock < 0) {
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65 TRACE(("leave newtcpdirect: sock failed"));
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66 goto out;
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67 }
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68
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69 ses.maxfd = MAX(ses.maxfd, sock);
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70
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71 /* Note that infd is actually the "outgoing" direction on the
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72 * tcp connection, vice versa for outfd.
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73 * We don't set outfd, that will get set after the connection's
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74 * progress succeeds */
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75 channel->infd = sock;
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76 channel->initconn = 1;
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77
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78 ret = DROPBEAR_SUCCESS;
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79
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80 out:
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81 m_free(desthost);
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82 m_free(orighost);
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83 TRACE(("leave newtcpdirect: ret %d", ret));
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84 return ret;
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85 }
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86
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87 /* Initiate a new TCP connection - this is non-blocking, so the socket
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88 * returned will need to be checked for success when it is first written.
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89 * Similarities with OpenSSH's connect_to() are not coincidental.
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90 * Returns -1 on failure */
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91 #if 0
9
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92 static int newtcp(const char * host, int port) {
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93
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94 int sock = -1;
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95 char portstring[6];
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96 struct addrinfo *res = NULL, *ai;
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97 int val;
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98
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99 struct addrinfo hints;
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100
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101 TRACE(("enter newtcp"));
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102
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103 memset(&hints, 0, sizeof(hints));
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104 /* TCP, either ip4 or ip6 */
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105 hints.ai_socktype = SOCK_STREAM;
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106 hints.ai_family = PF_UNSPEC;
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107
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108 snprintf(portstring, sizeof(portstring), "%d", port);
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109 if (getaddrinfo(host, portstring, &hints, &res) != 0) {
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110 if (res) {
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111 freeaddrinfo(res);
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112 }
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113 TRACE(("leave newtcp: failed getaddrinfo"));
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114 return -1;
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115 }
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116
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117 /* Use the first socket that works */
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118 for (ai = res; ai != NULL; ai = ai->ai_next) {
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119
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120 if (ai->ai_family != PF_INET && ai->ai_family != PF_INET6) {
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121 continue;
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122 }
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123
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124 sock = socket(ai->ai_family, SOCK_STREAM, 0);
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125 if (sock < 0) {
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126 TRACE(("TCP socket() failed"));
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127 continue;
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128 }
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129
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130 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) {
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131 close(sock);
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132 TRACE(("TCP non-blocking failed"));
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133 continue;
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134 }
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135
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136 /* non-blocking, so it might return without success (EINPROGRESS) */
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137 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
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138 if (errno == EINPROGRESS) {
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139 TRACE(("connect in progress"));
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140 } else {
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141 close(sock);
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142 TRACE(("TCP connect failed"));
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143 continue;
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144 }
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145 }
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146 break;
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147 }
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148
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149 freeaddrinfo(res);
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150
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151 if (ai == NULL) {
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152 return -1;
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153 }
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154
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155 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val));
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156 return sock;
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157 }
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158 #endif
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159 #endif /* DISABLE_TCPFWD_DIRECT */