Mercurial > dropbear
annotate tcpfwd-direct.c @ 13:db2c8e6fb284
Fixed stupid agentfwd error (using the listening FD, not the accepted on. gah)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 03 Jun 2004 18:08:34 +0000 |
parents | f76c9389e9e0 |
children | 469950e86d0f |
rev | line source |
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9
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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" |
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6 |
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7 #ifndef DISABLE_TCPFWD_DIRECT |
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8 static int newtcpdirect(struct Channel * channel); |
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9 static int newtcp(const char * host, int port); |
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10 |
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11 const struct ChanType chan_tcpdirect = { |
11
f76c9389e9e0
Mostly done with the listener changeover
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9
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12 1, /* sepfds */ |
9
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13 "direct-tcpip", |
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14 newtcpdirect, /* init */ |
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15 NULL, /* checkclose */ |
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16 NULL, /* reqhandler */ |
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17 NULL /* closehandler */ |
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18 }; |
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19 |
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20 |
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21 /* Called upon creating a new direct tcp channel (ie we connect out to an |
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22 * address */ |
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23 static int newtcpdirect(struct Channel * channel) { |
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24 |
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25 unsigned char* desthost = NULL; |
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26 unsigned int destport; |
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27 unsigned char* orighost = NULL; |
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28 unsigned int origport; |
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29 int sock; |
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30 int len; |
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31 int ret = DROPBEAR_FAILURE; |
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32 |
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33 if (ses.opts->nolocaltcp) { |
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34 TRACE(("leave newtcpdirect: local tcp forwarding disabled")); |
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35 goto out; |
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36 } |
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37 |
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38 desthost = buf_getstring(ses.payload, &len); |
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39 if (len > MAX_HOST_LEN) { |
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40 TRACE(("leave newtcpdirect: desthost too long")); |
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41 goto out; |
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42 } |
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43 |
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44 destport = buf_getint(ses.payload); |
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45 |
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46 orighost = buf_getstring(ses.payload, &len); |
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47 if (len > MAX_HOST_LEN) { |
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48 TRACE(("leave newtcpdirect: orighost too long")); |
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49 goto out; |
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50 } |
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51 |
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52 origport = buf_getint(ses.payload); |
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53 |
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54 /* best be sure */ |
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55 if (origport > 65535 || destport > 65535) { |
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56 TRACE(("leave newtcpdirect: port > 65535")); |
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57 goto out; |
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58 } |
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59 |
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60 sock = newtcp(desthost, destport); |
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61 if (sock < 0) { |
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62 TRACE(("leave newtcpdirect: sock failed")); |
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63 goto out; |
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64 } |
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65 |
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66 ses.maxfd = MAX(ses.maxfd, sock); |
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67 |
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68 /* Note that infd is actually the "outgoing" direction on the |
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69 * tcp connection, vice versa for outfd. |
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70 * We don't set outfd, that will get set after the connection's |
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71 * progress succeeds */ |
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72 channel->infd = sock; |
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73 channel->initconn = 1; |
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74 |
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75 ret = DROPBEAR_SUCCESS; |
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76 |
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77 out: |
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78 m_free(desthost); |
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79 m_free(orighost); |
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80 TRACE(("leave newtcpdirect: ret %d", ret)); |
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81 return ret; |
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82 } |
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83 |
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84 /* Initiate a new TCP connection - this is non-blocking, so the socket |
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85 * returned will need to be checked for success when it is first written. |
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86 * Similarities with OpenSSH's connect_to() are not coincidental. |
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87 * Returns -1 on failure */ |
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88 static int newtcp(const char * host, int port) { |
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89 |
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90 int sock = -1; |
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91 char portstring[6]; |
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92 struct addrinfo *res = NULL, *ai; |
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93 int val; |
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94 |
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95 struct addrinfo hints; |
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96 |
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97 TRACE(("enter newtcp")); |
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98 |
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99 memset(&hints, 0, sizeof(hints)); |
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100 /* TCP, either ip4 or ip6 */ |
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101 hints.ai_socktype = SOCK_STREAM; |
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102 hints.ai_family = PF_UNSPEC; |
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103 |
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104 snprintf(portstring, sizeof(portstring), "%d", port); |
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105 if (getaddrinfo(host, portstring, &hints, &res) != 0) { |
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106 if (res) { |
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107 freeaddrinfo(res); |
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108 } |
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109 TRACE(("leave newtcp: failed getaddrinfo")); |
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110 return -1; |
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111 } |
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112 |
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113 /* Use the first socket that works */ |
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114 for (ai = res; ai != NULL; ai = ai->ai_next) { |
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115 |
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116 if (ai->ai_family != PF_INET && ai->ai_family != PF_INET6) { |
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117 continue; |
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118 } |
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119 |
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120 sock = socket(ai->ai_family, SOCK_STREAM, 0); |
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121 if (sock < 0) { |
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122 TRACE(("TCP socket() failed")); |
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123 continue; |
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124 } |
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125 |
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126 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) { |
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127 close(sock); |
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128 TRACE(("TCP non-blocking failed")); |
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129 continue; |
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130 } |
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131 |
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132 /* non-blocking, so it might return without success (EINPROGRESS) */ |
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133 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
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134 if (errno == EINPROGRESS) { |
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135 TRACE(("connect in progress")); |
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136 } else { |
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137 close(sock); |
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138 TRACE(("TCP connect failed")); |
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139 continue; |
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140 } |
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141 } |
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142 break; |
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143 } |
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144 |
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145 freeaddrinfo(res); |
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146 |
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147 if (ai == NULL) { |
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148 return -1; |
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149 } |
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150 |
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151 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val)); |
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152 return sock; |
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153 } |
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154 #endif /* DISABLE_TCPFWD_DIRECT */ |