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1 /* ========================================================================
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2 * Copyright 1988-2008 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: UNIX TCP/IP routines
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 1 August 1988
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26 * Last Edited: 13 January 2008
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27 */
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28
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29 #include "ip_unix.c"
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30
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31 #undef write /* don't use redefined write() */
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32
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33 static tcptimeout_t tmoh = NIL; /* TCP timeout handler routine */
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34 static long ttmo_open = 0; /* TCP timeouts, in seconds */
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35 static long ttmo_read = 0;
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36 static long ttmo_write = 0;
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37 static long rshtimeout = 15; /* rsh timeout */
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38 static char *rshcommand = NIL; /* rsh command */
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39 static char *rshpath = NIL; /* rsh path */
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40 static long sshtimeout = 15; /* ssh timeout */
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41 static char *sshcommand = NIL; /* ssh command */
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42 static char *sshpath = NIL; /* ssh path */
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43 static long allowreversedns = T;/* allow reverse DNS lookup */
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44 static long tcpdebug = NIL; /* extra TCP debugging telemetry */
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45 static char *myClientAddr = NIL;/* client IP address */
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46 static char *myClientHost = NIL;/* client DNS name */
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47 static long myClientPort = -1; /* client port number */
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48 static char *myServerAddr = NIL;/* server IP address */
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49 static char *myServerHost = NIL;/* server DNS name */
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50 static long myServerPort = -1; /* server port number */
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51
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52 extern long maxposint; /* get this from write.c */
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53
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54 /* Local function prototypes */
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55
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56 int tcp_socket_open (int family,void *adr,size_t adrlen,unsigned short port,
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57 char *tmp,int *ctr,char *hst);
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58 static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
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59 long *contd);
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60 long tcp_abort (TCPSTREAM *stream);
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61 char *tcp_name (struct sockaddr *sadr,long flag);
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62 char *tcp_name_valid (char *s);
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63
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64 /* TCP/IP manipulate parameters
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65 * Accepts: function code
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66 * function-dependent value
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67 * Returns: function-dependent return value
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68 */
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69
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70 void *tcp_parameters (long function,void *value)
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71 {
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72 void *ret = NIL;
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73 switch ((int) function) {
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74 case SET_TIMEOUT:
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75 tmoh = (tcptimeout_t) value;
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76 case GET_TIMEOUT:
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77 ret = (void *) tmoh;
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78 break;
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79 case SET_OPENTIMEOUT:
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80 ttmo_open = (long) value;
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81 case GET_OPENTIMEOUT:
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82 ret = (void *) ttmo_open;
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83 break;
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84 case SET_READTIMEOUT:
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85 ttmo_read = (long) value;
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86 case GET_READTIMEOUT:
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87 ret = (void *) ttmo_read;
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88 break;
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89 case SET_WRITETIMEOUT:
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90 ttmo_write = (long) value;
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91 case GET_WRITETIMEOUT:
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92 ret = (void *) ttmo_write;
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93 break;
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94 case SET_ALLOWREVERSEDNS:
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95 allowreversedns = (long) value;
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96 case GET_ALLOWREVERSEDNS:
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97 ret = (void *) allowreversedns;
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98 break;
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99 case SET_TCPDEBUG:
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100 tcpdebug = (long) value;
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101 case GET_TCPDEBUG:
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102 ret = (void *) tcpdebug;
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103 break;
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104
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105 case SET_RSHTIMEOUT:
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106 rshtimeout = (long) value;
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107 case GET_RSHTIMEOUT:
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108 ret = (void *) rshtimeout;
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109 break;
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110 case SET_RSHCOMMAND:
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111 if (rshcommand) fs_give ((void **) &rshcommand);
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112 rshcommand = cpystr ((char *) value);
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113 case GET_RSHCOMMAND:
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114 ret = (void *) rshcommand;
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115 break;
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116 case SET_RSHPATH:
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117 if (rshpath) fs_give ((void **) &rshpath);
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118 rshpath = cpystr ((char *) value);
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119 case GET_RSHPATH:
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120 ret = (void *) rshpath;
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121 break;
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122 case SET_SSHTIMEOUT:
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123 sshtimeout = (long) value;
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124 case GET_SSHTIMEOUT:
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125 ret = (void *) sshtimeout;
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126 break;
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127 case SET_SSHCOMMAND:
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128 if (sshcommand) fs_give ((void **) &sshcommand);
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129 sshcommand = cpystr ((char *) value);
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130 case GET_SSHCOMMAND:
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131 ret = (void *) sshcommand;
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132 break;
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133 case SET_SSHPATH:
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134 if (sshpath) fs_give ((void **) &sshpath);
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135 sshpath = cpystr ((char *) value);
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136 case GET_SSHPATH:
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137 ret = (void *) sshpath;
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138 break;
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139 }
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140 return ret;
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141 }
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142
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143 /* TCP/IP open
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144 * Accepts: host name
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145 * contact service name
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146 * contact port number and optional silent flag
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147 * Returns: TCP/IP stream if success else NIL
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148 */
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149
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150 TCPSTREAM *tcp_open (char *host,char *service,unsigned long port)
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151 {
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152 TCPSTREAM *stream = NIL;
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153 int family;
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154 int sock = -1;
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155 int ctr = 0;
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156 int silent = (port & NET_SILENT) ? T : NIL;
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157 int *ctrp = (port & NET_NOOPENTIMEOUT) ? NIL : &ctr;
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158 char *s,*hostname,tmp[MAILTMPLEN];
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159 void *adr;
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160 size_t adrlen;
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161 struct servent *sv = NIL;
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162 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
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163 void *data,*next;
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164 port &= 0xffff; /* erase flags */
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165 /* lookup service */
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166 if (service && (sv = getservbyname (service,"tcp")))
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167 port = ntohs (sv->s_port);
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168 /* The domain literal form is used (rather than simply the dotted decimal
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169 as with other Unix programs) because it has to be a valid "host name"
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170 in mailsystem terminology. */
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171 /* look like domain literal? */
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172 if (host[0] == '[' && host[(strlen (host))-1] == ']') {
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173 strcpy (tmp,host+1); /* yes, copy number part */
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174 tmp[(strlen (tmp))-1] = '\0';
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175 if (adr = ip_stringtoaddr (tmp,&adrlen,&family)) {
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176 (*bn) (BLOCK_TCPOPEN,NIL);
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177 /* get an open socket for this system */
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178 sock = tcp_socket_open (family,adr,adrlen,port,tmp,ctrp,hostname = host);
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179 (*bn) (BLOCK_NONE,NIL);
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180 fs_give ((void **) &adr);
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181 }
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182 else sprintf (tmp,"Bad format domain-literal: %.80s",host);
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183 }
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184
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185 else { /* lookup host name */
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186 if (tcpdebug) {
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187 sprintf (tmp,"DNS resolution %.80s",host);
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188 mm_log (tmp,TCPDEBUG);
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189 }
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190 (*bn) (BLOCK_DNSLOOKUP,NIL);/* quell alarms */
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191 data = (*bn) (BLOCK_SENSITIVE,NIL);
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192 if (!(s = ip_nametoaddr (host,&adrlen,&family,&hostname,&next)))
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193 sprintf (tmp,"No such host as %.80s",host);
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194 (*bn) (BLOCK_NONSENSITIVE,data);
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195 (*bn) (BLOCK_NONE,NIL);
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196 if (s) { /* DNS resolution won? */
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197 if (tcpdebug) mm_log ("DNS resolution done",TCPDEBUG);
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198 do {
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199 (*bn) (BLOCK_TCPOPEN,NIL);
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200 if (((sock = tcp_socket_open (family,s,adrlen,port,tmp,ctrp,
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201 hostname)) < 0) &&
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202 (s = ip_nametoaddr (NIL,&adrlen,&family,&hostname,&next)) &&
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203 !silent) mm_log (tmp,WARN);
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204 (*bn) (BLOCK_NONE,NIL);
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205 } while ((sock < 0) && s);/* repeat until success or no more addreses */
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206 }
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207 }
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208 if (sock >= 0) { /* won */
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209 stream = (TCPSTREAM *) memset (fs_get (sizeof (TCPSTREAM)),0,
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210 sizeof (TCPSTREAM));
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211 stream->port = port; /* port number */
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212 /* init sockets */
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213 stream->tcpsi = stream->tcpso = sock;
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214 /* stash in the snuck-in byte */
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215 if (stream->ictr = ctr) *(stream->iptr = stream->ibuf) = tmp[0];
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216 /* copy official host name */
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217 stream->host = cpystr (hostname);
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218 if (tcpdebug) mm_log ("Stream open and ready for read",TCPDEBUG);
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219 }
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220 else if (!silent) mm_log (tmp,ERROR);
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221 return stream; /* return success */
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222 }
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223
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224 /* Open a TCP socket
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225 * Accepts: protocol family
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226 * address to connect to
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227 * address length
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228 * port
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229 * scratch buffer
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230 * pointer to "first byte read in" storage or NIL
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231 * host name for error message
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232 * Returns: socket if success, else -1 with error string in scratch buffer
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233 */
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234
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235 int tcp_socket_open (int family,void *adr,size_t adrlen,unsigned short port,
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236 char *tmp,int *ctr,char *hst)
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237 {
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238 int i,ti,sock,flgs;
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239 size_t len;
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240 time_t now;
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241 struct protoent *pt = getprotobyname ("tcp");
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3
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242 fd_set rfds,wfds,efds;
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0
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243 struct timeval tmo;
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244 struct sockaddr *sadr = ip_sockaddr (family,adr,adrlen,port,&len);
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245 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
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246 /* fetid Solaris */
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247 void *data = (*bn) (BLOCK_SENSITIVE,NIL);
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248 sprintf (tmp,"Trying IP address [%s]",ip_sockaddrtostring (sadr));
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249 mm_log (tmp,NIL);
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250 /* make a socket */
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251 if ((sock = socket (sadr->sa_family,SOCK_STREAM,pt ? pt->p_proto : 0)) < 0) {
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252 sprintf (tmp,"Unable to create TCP socket: %s",strerror (errno));
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253 (*bn) (BLOCK_NONSENSITIVE,data);
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254 }
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255 else if (sock >= FD_SETSIZE) {/* unselectable sockets are useless */
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256 sprintf (tmp,"Unable to create selectable TCP socket (%d >= %d)",
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257 sock,FD_SETSIZE);
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258 (*bn) (BLOCK_NONSENSITIVE,data);
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259 close (sock);
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260 sock = -1;
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261 errno = EMFILE;
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262 }
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263
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264 else { /* get current socket flags */
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265 flgs = fcntl (sock,F_GETFL,0);
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266 /* set non-blocking if want open timeout */
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267 if (ctr) fcntl (sock,F_SETFL,flgs | FNDELAY);
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268 /* open connection */
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269 while ((i = connect (sock,sadr,len)) < 0 && (errno == EINTR));
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270 (*bn) (BLOCK_NONSENSITIVE,data);
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271 if (i < 0) switch (errno) { /* failed? */
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272 case EAGAIN: /* DG brain damage */
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273 case EINPROGRESS: /* what we expect to happen */
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274 case EALREADY: /* or another form of it */
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275 case EISCONN: /* restart after interrupt? */
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276 case EADDRINUSE: /* restart after interrupt? */
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277 break; /* well, not really, it was interrupted */
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278 default:
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279 sprintf (tmp,"Can't connect to %.80s,%u: %s",hst,(unsigned int) port,
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280 strerror (errno));
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281 close (sock); /* flush socket */
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282 sock = -1;
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283 }
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284 if ((sock >= 0) && ctr) { /* want open timeout? */
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285 now = time (0); /* open timeout */
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286 ti = ttmo_open ? now + ttmo_open : 0;
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287 tmo.tv_usec = 0;
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3
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288 FD_ZERO (&rfds); /* initialize selection vector */
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289 FD_ZERO (&wfds); /* initialize selection vector */
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0
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290 FD_ZERO (&efds); /* handle errors too */
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3
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291 FD_SET (sock,&rfds); /* block for error or readable or writable */
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292 FD_SET (sock,&wfds);
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0
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293 FD_SET (sock,&efds);
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294 do { /* block under timeout */
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295 tmo.tv_sec = ti ? ti - now : 0;
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3
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296 i = select (sock+1,&rfds,&wfds,&efds,ti ? &tmo : NIL);
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0
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297 now = time (0); /* fake timeout if interrupt & time expired */
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298 if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
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299 } while ((i < 0) && (errno == EINTR));
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300 if (i > 0) { /* success, make sure really connected */
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301 /* restore blocking status */
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302 fcntl (sock,F_SETFL,flgs);
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303 /* This used to be a zero-byte read(), but that crashes Solaris */
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304 /* get socket status */
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3
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305 if(FD_ISSET(sock, &rfds)) while (((i = *ctr = read (sock,tmp,1)) < 0) && (errno == EINTR));
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0
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306 }
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307 if (i <= 0) { /* timeout or error? */
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308 i = i ? errno : ETIMEDOUT;/* determine error code */
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309 close (sock); /* flush socket */
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310 sock = -1;
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311 errno = i; /* return error code */
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312 sprintf (tmp,"Connection failed to %.80s,%lu: %s",hst,
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313 (unsigned long) port,strerror (errno));
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314 }
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315 }
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316 }
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317 fs_give ((void **) &sadr);
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318 return sock; /* return the socket */
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319 }
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320
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321 /* TCP/IP authenticated open
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322 * Accepts: host name
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323 * service name
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324 * returned user name buffer
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325 * Returns: TCP/IP stream if success else NIL
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326 */
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327
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328 #define MAXARGV 20
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329
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330 TCPSTREAM *tcp_aopen (NETMBX *mb,char *service,char *usrbuf)
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331 {
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332 TCPSTREAM *stream = NIL;
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333 void *adr;
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334 char host[MAILTMPLEN],tmp[MAILTMPLEN],*path,*argv[MAXARGV+1],*r;
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335 int i,ti,pipei[2],pipeo[2];
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336 size_t len;
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337 time_t now;
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338 struct timeval tmo;
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339 fd_set fds,efds;
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340 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
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341 #ifdef SSHPATH /* ssh path defined yet? */
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342 if (!sshpath) sshpath = cpystr (SSHPATH);
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343 #endif
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344 #ifdef RSHPATH /* rsh path defined yet? */
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345 if (!rshpath) rshpath = cpystr (RSHPATH);
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346 #endif
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347 if (*service == '*') { /* want ssh? */
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348 /* return immediately if ssh disabled */
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349 if (!(sshpath && (ti = sshtimeout))) return NIL;
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350 /* ssh command prototype defined yet? */
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351 if (!sshcommand) sshcommand = cpystr ("%s %s -l %s exec /etc/r%sd");
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352 }
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353 /* want rsh? */
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354 else if (rshpath && (ti = rshtimeout)) {
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355 /* rsh command prototype defined yet? */
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356 if (!rshcommand) rshcommand = cpystr ("%s %s -l %s exec /etc/r%sd");
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357 }
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358 else return NIL; /* rsh disabled */
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359 /* look like domain literal? */
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360 if (mb->host[0] == '[' && mb->host[i = (strlen (mb->host))-1] == ']') {
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361 strcpy (host,mb->host+1); /* yes, copy without brackets */
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362 host[i-1] = '\0';
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363 /* validate domain literal */
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364 if (adr = ip_stringtoaddr (host,&len,&i)) fs_give ((void **) &adr);
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365 else {
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366 sprintf (tmp,"Bad format domain-literal: %.80s",host);
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367 mm_log (tmp,ERROR);
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368 return NIL;
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369 }
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370 }
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371 else strcpy (host,tcp_canonical (mb->host));
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372
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373 if (*service == '*') /* build ssh command */
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374 sprintf (tmp,sshcommand,sshpath,host,
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375 mb->user[0] ? mb->user : myusername (),service + 1);
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376 else sprintf (tmp,rshcommand,rshpath,host,
|
|
|
377 mb->user[0] ? mb->user : myusername (),service);
|
|
|
378 if (tcpdebug) {
|
|
|
379 char msg[MAILTMPLEN];
|
|
|
380 sprintf (msg,"Trying %.100s",tmp);
|
|
|
381 mm_log (msg,TCPDEBUG);
|
|
|
382 }
|
|
|
383 /* parse command into argv */
|
|
|
384 for (i = 1,path = argv[0] = strtok_r (tmp," ",&r);
|
|
|
385 (i < MAXARGV) && (argv[i] = strtok_r (NIL," ",&r)); i++);
|
|
|
386 argv[i] = NIL; /* make sure argv tied off */
|
|
|
387 /* make command pipes */
|
|
|
388 if (pipe (pipei) < 0) return NIL;
|
|
|
389 if ((pipei[0] >= FD_SETSIZE) || (pipei[1] >= FD_SETSIZE) ||
|
|
|
390 (pipe (pipeo) < 0)) {
|
|
|
391 close (pipei[0]); close (pipei[1]);
|
|
|
392 return NIL;
|
|
|
393 }
|
|
|
394 (*bn) (BLOCK_TCPOPEN,NIL); /* quell alarm up here for NeXT */
|
|
|
395 if ((pipeo[0] >= FD_SETSIZE) || (pipeo[1] >= FD_SETSIZE) ||
|
|
|
396 ((i = fork ()) < 0)) { /* make inferior process */
|
|
|
397 close (pipei[0]); close (pipei[1]);
|
|
|
398 close (pipeo[0]); close (pipeo[1]);
|
|
|
399 (*bn) (BLOCK_NONE,NIL);
|
|
|
400 return NIL;
|
|
|
401 }
|
|
|
402 if (!i) { /* if child */
|
|
|
403 alarm (0); /* never have alarms in children */
|
|
|
404 if (!fork ()) { /* make grandchild so it's inherited by init */
|
|
|
405 int cf; /* don't alter parent vars in case vfork() */
|
|
|
406 int maxfd = max (20,max (max(pipei[0],pipei[1]),max(pipeo[0],pipeo[1])));
|
|
|
407 dup2 (pipei[1],1); /* parent's input is my output */
|
|
|
408 dup2 (pipei[1],2); /* parent's input is my error output too */
|
|
|
409 dup2 (pipeo[0],0); /* parent's output is my input */
|
|
|
410 /* close all unnecessary descriptors */
|
|
|
411 for (cf = 3; cf <= maxfd; cf++) close (cf);
|
|
|
412 setpgrp (0,getpid ()); /* be our own process group */
|
|
|
413 _exit (execv (path,argv));/* now run it */
|
|
|
414 }
|
|
|
415 _exit (1); /* child is done */
|
|
|
416 }
|
|
|
417 grim_pid_reap (i,NIL); /* reap child; grandchild now owned by init */
|
|
|
418 close (pipei[1]); /* close child's side of the pipes */
|
|
|
419 close (pipeo[0]);
|
|
|
420
|
|
|
421 /* create TCP/IP stream */
|
|
|
422 stream = (TCPSTREAM *) memset (fs_get (sizeof (TCPSTREAM)),0,
|
|
|
423 sizeof (TCPSTREAM));
|
|
|
424 /* copy remote host name from argument */
|
|
|
425 stream->remotehost = cpystr (stream->host = cpystr (host));
|
|
|
426 stream->tcpsi = pipei[0]; /* init sockets */
|
|
|
427 stream->tcpso = pipeo[1];
|
|
|
428 stream->ictr = 0; /* init input counter */
|
|
|
429 stream->port = 0xffffffff; /* no port number */
|
|
|
430 ti += now = time (0); /* open timeout */
|
|
|
431 tmo.tv_usec = 0; /* initialize usec timeout */
|
|
|
432 FD_ZERO (&fds); /* initialize selection vector */
|
|
|
433 FD_ZERO (&efds); /* handle errors too */
|
|
|
434 FD_SET (stream->tcpsi,&fds); /* set bit in selection vector */
|
|
|
435 FD_SET (stream->tcpsi,&efds); /* set bit in error selection vector */
|
|
|
436 FD_SET (stream->tcpso,&efds); /* set bit in error selection vector */
|
|
|
437 do { /* block under timeout */
|
|
|
438 tmo.tv_sec = ti - now;
|
|
|
439 i = select (max (stream->tcpsi,stream->tcpso)+1,&fds,NIL,&efds,&tmo);
|
|
|
440 now = time (0); /* fake timeout if interrupt & time expired */
|
|
|
441 if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
|
|
|
442 } while ((i < 0) && (errno == EINTR));
|
|
|
443 if (i <= 0) { /* timeout or error? */
|
|
|
444 sprintf (tmp,i ? "error in %s to IMAP server" :
|
|
|
445 "%s to IMAP server timed out",(*service == '*') ? "ssh" : "rsh");
|
|
|
446 mm_log (tmp,WARN);
|
|
|
447 tcp_close (stream); /* punt stream */
|
|
|
448 stream = NIL;
|
|
|
449 }
|
|
|
450 (*bn) (BLOCK_NONE,NIL);
|
|
|
451 /* return user name */
|
|
|
452 strcpy (usrbuf,mb->user[0] ? mb->user : myusername ());
|
|
|
453 return stream; /* return success */
|
|
|
454 }
|
|
|
455
|
|
|
456 /* TCP receive line
|
|
|
457 * Accepts: TCP stream
|
|
|
458 * Returns: text line string or NIL if failure
|
|
|
459 */
|
|
|
460
|
|
|
461 char *tcp_getline (TCPSTREAM *stream)
|
|
|
462 {
|
|
|
463 unsigned long n,contd;
|
|
|
464 char *ret = tcp_getline_work (stream,&n,&contd);
|
|
|
465 if (ret && contd) { /* got a line needing continuation? */
|
|
|
466 STRINGLIST *stl = mail_newstringlist ();
|
|
|
467 STRINGLIST *stc = stl;
|
|
|
468 do { /* collect additional lines */
|
|
|
469 stc->text.data = (unsigned char *) ret;
|
|
|
470 stc->text.size = n;
|
|
|
471 stc = stc->next = mail_newstringlist ();
|
|
|
472 ret = tcp_getline_work (stream,&n,&contd);
|
|
|
473 } while (ret && contd);
|
|
|
474 if (ret) { /* stash final part of line on list */
|
|
|
475 stc->text.data = (unsigned char *) ret;
|
|
|
476 stc->text.size = n;
|
|
|
477 /* determine how large a buffer we need */
|
|
|
478 for (n = 0, stc = stl; stc; stc = stc->next) n += stc->text.size;
|
|
|
479 ret = fs_get (n + 1); /* copy parts into buffer */
|
|
|
480 for (n = 0, stc = stl; stc; n += stc->text.size, stc = stc->next)
|
|
|
481 memcpy (ret + n,stc->text.data,stc->text.size);
|
|
|
482 ret[n] = '\0';
|
|
|
483 }
|
|
|
484 mail_free_stringlist (&stl);/* either way, done with list */
|
|
|
485 }
|
|
|
486 return ret;
|
|
|
487 }
|
|
|
488
|
|
|
489 /* TCP receive line or partial line
|
|
|
490 * Accepts: TCP stream
|
|
|
491 * pointer to return size
|
|
|
492 * pointer to return continuation flag
|
|
|
493 * Returns: text line string, size and continuation flag, or NIL if failure
|
|
|
494 */
|
|
|
495
|
|
|
496 static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
|
|
|
497 long *contd)
|
|
|
498 {
|
|
|
499 unsigned long n;
|
|
|
500 char *s,*ret,c,d;
|
|
|
501 *contd = NIL; /* assume no continuation */
|
|
|
502 /* make sure have data */
|
|
|
503 if (!tcp_getdata (stream)) return NIL;
|
|
|
504 for (s = stream->iptr, n = 0, c = '\0'; stream->ictr--; n++, c = d) {
|
|
|
505 d = *stream->iptr++; /* slurp another character */
|
|
|
506 if ((c == '\015') && (d == '\012')) {
|
|
|
507 ret = (char *) fs_get (n--);
|
|
|
508 memcpy (ret,s,*size = n); /* copy into a free storage string */
|
|
|
509 ret[n] = '\0'; /* tie off string with null */
|
|
|
510 return ret;
|
|
|
511 }
|
|
|
512 }
|
|
|
513 /* copy partial string from buffer */
|
|
|
514 memcpy ((ret = (char *) fs_get (n)),s,*size = n);
|
|
|
515 /* get more data from the net */
|
|
|
516 if (!tcp_getdata (stream)) fs_give ((void **) &ret);
|
|
|
517 /* special case of newline broken by buffer */
|
|
|
518 else if ((c == '\015') && (*stream->iptr == '\012')) {
|
|
|
519 stream->iptr++; /* eat the line feed */
|
|
|
520 stream->ictr--;
|
|
|
521 ret[*size = --n] = '\0'; /* tie off string with null */
|
|
|
522 }
|
|
|
523 else *contd = LONGT; /* continuation needed */
|
|
|
524 return ret;
|
|
|
525 }
|
|
|
526
|
|
|
527 /* TCP/IP receive buffer
|
|
|
528 * Accepts: TCP/IP stream
|
|
|
529 * size in bytes
|
|
|
530 * buffer to read into
|
|
|
531 * Returns: T if success, NIL otherwise
|
|
|
532 */
|
|
|
533
|
|
|
534 long tcp_getbuffer (TCPSTREAM *stream,unsigned long size,char *s)
|
|
|
535 {
|
|
|
536 unsigned long n;
|
|
|
537 /* make sure socket still alive */
|
|
|
538 if (stream->tcpsi < 0) return NIL;
|
|
|
539 /* can transfer bytes from buffer? */
|
|
|
540 if (n = min (size,stream->ictr)) {
|
|
|
541 memcpy (s,stream->iptr,n); /* yes, slurp as much as we can from it */
|
|
|
542 s += n; /* update pointer */
|
|
|
543 stream->iptr +=n;
|
|
|
544 size -= n; /* update # of bytes to do */
|
|
|
545 stream->ictr -=n;
|
|
|
546 }
|
|
|
547 if (size) {
|
|
|
548 int i;
|
|
|
549 fd_set fds,efds;
|
|
|
550 struct timeval tmo;
|
|
|
551 time_t t = time (0);
|
|
|
552 blocknotify_t bn=(blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
|
|
|
553 (*bn) (BLOCK_TCPREAD,NIL);
|
|
|
554 while (size > 0) { /* until request satisfied */
|
|
|
555 time_t tl = time (0);
|
|
|
556 time_t now = tl;
|
|
|
557 time_t ti = ttmo_read ? now + ttmo_read : 0;
|
|
|
558 if (tcpdebug) mm_log ("Reading TCP buffer",TCPDEBUG);
|
|
|
559 tmo.tv_usec = 0;
|
|
|
560 FD_ZERO (&fds); /* initialize selection vector */
|
|
|
561 FD_ZERO (&efds); /* handle errors too */
|
|
|
562 /* set bit in selection vectors */
|
|
|
563 FD_SET (stream->tcpsi,&fds);
|
|
|
564 FD_SET (stream->tcpsi,&efds);
|
|
|
565 errno = NIL; /* initially no error */
|
|
|
566 do { /* block under timeout */
|
|
|
567 tmo.tv_sec = ti ? ti - now : 0;
|
|
|
568 i = select (stream->tcpsi+1,&fds,NIL,&efds,ti ? &tmo : NIL);
|
|
|
569 now = time (0); /* fake timeout if interrupt & time expired */
|
|
|
570 if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
|
|
|
571 } while ((i < 0) && (errno == EINTR));
|
|
|
572 if (i) { /* non-timeout result from select? */
|
|
|
573 if (i > 0) /* read what we can */
|
|
|
574 while (((i = read (stream->tcpsi,s,(int) min (maxposint,size))) < 0)
|
|
|
575 && (errno == EINTR));
|
|
|
576 if (i <= 0) { /* error seen? */
|
|
|
577 if (tcpdebug) {
|
|
|
578 char tmp[MAILTMPLEN];
|
|
|
579 if (i) sprintf (s = tmp,"TCP buffer read I/O error %d",errno);
|
|
|
580 else s = "TCP buffer read end of file";
|
|
|
581 mm_log (s,TCPDEBUG);
|
|
|
582 }
|
|
|
583 return tcp_abort (stream);
|
|
|
584 }
|
|
|
585 s += i; /* success, point at new place to write */
|
|
|
586 size -= i; /* reduce byte count */
|
|
|
587 if (tcpdebug) mm_log ("Successfully read TCP buffer",TCPDEBUG);
|
|
|
588 }
|
|
|
589 /* timeout, punt unless told not to */
|
|
|
590 else if (!tmoh || !(*tmoh) (now - t,now - tl)) {
|
|
|
591 if (tcpdebug) mm_log ("TCP buffer read timeout",TCPDEBUG);
|
|
|
592 return tcp_abort (stream);
|
|
|
593 }
|
|
|
594 }
|
|
|
595 (*bn) (BLOCK_NONE,NIL);
|
|
|
596 }
|
|
|
597 *s = '\0'; /* tie off string */
|
|
|
598 return LONGT;
|
|
|
599 }
|
|
|
600
|
|
|
601 /* TCP/IP receive data
|
|
|
602 * Accepts: TCP/IP stream
|
|
|
603 * Returns: T if success, NIL otherwise
|
|
|
604 */
|
|
|
605
|
|
|
606 long tcp_getdata (TCPSTREAM *stream)
|
|
|
607 {
|
|
|
608 int i;
|
|
|
609 fd_set fds,efds;
|
|
|
610 struct timeval tmo;
|
|
|
611 time_t t = time (0);
|
|
|
612 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
|
|
|
613 if (stream->tcpsi < 0) return NIL;
|
|
|
614 (*bn) (BLOCK_TCPREAD,NIL);
|
|
|
615 while (stream->ictr < 1) { /* if nothing in the buffer */
|
|
|
616 time_t tl = time (0); /* start of request */
|
|
|
617 time_t now = tl;
|
|
|
618 time_t ti = ttmo_read ? now + ttmo_read : 0;
|
|
|
619 if (tcpdebug) mm_log ("Reading TCP data",TCPDEBUG);
|
|
|
620 tmo.tv_usec = 0;
|
|
|
621 FD_ZERO (&fds); /* initialize selection vector */
|
|
|
622 FD_ZERO (&efds); /* handle errors too */
|
|
|
623 FD_SET (stream->tcpsi,&fds);/* set bit in selection vectors */
|
|
|
624 FD_SET (stream->tcpsi,&efds);
|
|
|
625 errno = NIL; /* initially no error */
|
|
|
626 do { /* block under timeout */
|
|
|
627 tmo.tv_sec = ti ? ti - now : 0;
|
|
|
628 i = select (stream->tcpsi+1,&fds,NIL,&efds,ti ? &tmo : NIL);
|
|
|
629 now = time (0); /* fake timeout if interrupt & time expired */
|
|
|
630 if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
|
|
|
631 } while ((i < 0) && (errno == EINTR));
|
|
|
632 if (i) { /* non-timeout result from select? */
|
|
|
633 /* read what we can */
|
|
|
634 if (i > 0) while (((i = read (stream->tcpsi,stream->ibuf,BUFLEN)) < 0) &&
|
|
|
635 (errno == EINTR));
|
|
|
636 if (i <= 0) { /* error seen? */
|
|
|
637 if (tcpdebug) {
|
|
|
638 char *s,tmp[MAILTMPLEN];
|
|
|
639 if (i) sprintf (s = tmp,"TCP data read I/O error %d",errno);
|
|
|
640 else s = "TCP data read end of file";
|
|
|
641 mm_log (s,TCPDEBUG);
|
|
|
642 }
|
|
|
643 return tcp_abort (stream);
|
|
|
644 }
|
|
|
645 stream->ictr = i; /* success, set new count and pointer */
|
|
|
646 stream->iptr = stream->ibuf;
|
|
|
647 if (tcpdebug) mm_log ("Successfully read TCP data",TCPDEBUG);
|
|
|
648 }
|
|
|
649 /* timeout, punt unless told not to */
|
|
|
650 else if (!tmoh || !(*tmoh) (now - t,now - tl)) {
|
|
|
651 if (tcpdebug) mm_log ("TCP data read timeout",TCPDEBUG);
|
|
|
652 return tcp_abort (stream);/* error or timeout no-continue */
|
|
|
653 }
|
|
|
654 }
|
|
|
655 (*bn) (BLOCK_NONE,NIL);
|
|
|
656 return T;
|
|
|
657 }
|
|
|
658
|
|
|
659 /* TCP/IP send string as record
|
|
|
660 * Accepts: TCP/IP stream
|
|
|
661 * string pointer
|
|
|
662 * Returns: T if success else NIL
|
|
|
663 */
|
|
|
664
|
|
|
665 long tcp_soutr (TCPSTREAM *stream,char *string)
|
|
|
666 {
|
|
|
667 return tcp_sout (stream,string,(unsigned long) strlen (string));
|
|
|
668 }
|
|
|
669
|
|
|
670
|
|
|
671 /* TCP/IP send string
|
|
|
672 * Accepts: TCP/IP stream
|
|
|
673 * string pointer
|
|
|
674 * byte count
|
|
|
675 * Returns: T if success else NIL
|
|
|
676 */
|
|
|
677
|
|
|
678 long tcp_sout (TCPSTREAM *stream,char *string,unsigned long size)
|
|
|
679 {
|
|
|
680 int i;
|
|
|
681 fd_set fds,efds;
|
|
|
682 struct timeval tmo;
|
|
|
683 time_t t = time (0);
|
|
|
684 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
|
|
|
685 if (stream->tcpso < 0) return NIL;
|
|
|
686 (*bn) (BLOCK_TCPWRITE,NIL);
|
|
|
687 while (size > 0) { /* until request satisfied */
|
|
|
688 time_t tl = time (0); /* start of request */
|
|
|
689 time_t now = tl;
|
|
|
690 time_t ti = ttmo_write ? now + ttmo_write : 0;
|
|
|
691 if (tcpdebug) mm_log ("Writing to TCP",TCPDEBUG);
|
|
|
692 tmo.tv_usec = 0;
|
|
|
693 FD_ZERO (&fds); /* initialize selection vector */
|
|
|
694 FD_ZERO (&efds); /* handle errors too */
|
|
|
695 FD_SET (stream->tcpso,&fds);/* set bit in selection vector */
|
|
|
696 FD_SET(stream->tcpso,&efds);/* set bit in error selection vector */
|
|
|
697 errno = NIL; /* block and write */
|
|
|
698 do { /* block under timeout */
|
|
|
699 tmo.tv_sec = ti ? ti - now : 0;
|
|
|
700 i = select (stream->tcpso+1,NIL,&fds,&efds,ti ? &tmo : NIL);
|
|
|
701 now = time (0); /* fake timeout if interrupt & time expired */
|
|
|
702 if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
|
|
|
703 } while ((i < 0) && (errno == EINTR));
|
|
|
704 if (i) { /* non-timeout result from select? */
|
|
|
705 /* write what we can */
|
|
|
706 if (i > 0) while (((i = write (stream->tcpso,string,size)) < 0) &&
|
|
|
707 (errno == EINTR));
|
|
|
708 if (i <= 0) { /* error seen? */
|
|
|
709 if (tcpdebug) {
|
|
|
710 char tmp[MAILTMPLEN];
|
|
|
711 sprintf (tmp,"TCP write I/O error %d",errno);
|
|
|
712 mm_log (tmp,TCPDEBUG);
|
|
|
713 }
|
|
|
714 return tcp_abort (stream);
|
|
|
715 }
|
|
|
716 string += i; /* how much we sent */
|
|
|
717 size -= i; /* count this size */
|
|
|
718 if (tcpdebug) mm_log ("successfully wrote to TCP",TCPDEBUG);
|
|
|
719 }
|
|
|
720 /* timeout, punt unless told not to */
|
|
|
721 else if (!tmoh || !(*tmoh) (now - t,now - tl)) {
|
|
|
722 if (tcpdebug) mm_log ("TCP write timeout",TCPDEBUG);
|
|
|
723 return tcp_abort (stream);
|
|
|
724 }
|
|
|
725 }
|
|
|
726 (*bn) (BLOCK_NONE,NIL);
|
|
|
727 return T; /* all done */
|
|
|
728 }
|
|
|
729
|
|
|
730 /* TCP/IP close
|
|
|
731 * Accepts: TCP/IP stream
|
|
|
732 */
|
|
|
733
|
|
|
734 void tcp_close (TCPSTREAM *stream)
|
|
|
735 {
|
|
|
736 tcp_abort (stream); /* nuke the stream */
|
|
|
737 /* flush host names */
|
|
|
738 if (stream->host) fs_give ((void **) &stream->host);
|
|
|
739 if (stream->remotehost) fs_give ((void **) &stream->remotehost);
|
|
|
740 if (stream->localhost) fs_give ((void **) &stream->localhost);
|
|
|
741 fs_give ((void **) &stream); /* flush the stream */
|
|
|
742 }
|
|
|
743
|
|
|
744
|
|
|
745 /* TCP/IP abort stream
|
|
|
746 * Accepts: TCP/IP stream
|
|
|
747 * Returns: NIL always
|
|
|
748 */
|
|
|
749
|
|
|
750 long tcp_abort (TCPSTREAM *stream)
|
|
|
751 {
|
|
|
752 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
|
|
|
753 if (stream->tcpsi >= 0) { /* no-op if no socket */
|
|
|
754 (*bn) (BLOCK_TCPCLOSE,NIL);
|
|
|
755 close (stream->tcpsi); /* nuke the socket */
|
|
|
756 if (stream->tcpsi != stream->tcpso) close (stream->tcpso);
|
|
|
757 stream->tcpsi = stream->tcpso = -1;
|
|
|
758 }
|
|
|
759 (*bn) (BLOCK_NONE,NIL);
|
|
|
760 return NIL;
|
|
|
761 }
|
|
|
762
|
|
|
763 /* TCP/IP get host name
|
|
|
764 * Accepts: TCP/IP stream
|
|
|
765 * Returns: host name for this stream
|
|
|
766 */
|
|
|
767
|
|
|
768 char *tcp_host (TCPSTREAM *stream)
|
|
|
769 {
|
|
|
770 return stream->host; /* use tcp_remotehost() if want guarantees */
|
|
|
771 }
|
|
|
772
|
|
|
773
|
|
|
774 /* TCP/IP get remote host name
|
|
|
775 * Accepts: TCP/IP stream
|
|
|
776 * Returns: host name for this stream
|
|
|
777 */
|
|
|
778
|
|
|
779 char *tcp_remotehost (TCPSTREAM *stream)
|
|
|
780 {
|
|
|
781 if (!stream->remotehost) {
|
|
|
782 size_t sadrlen;
|
|
|
783 struct sockaddr *sadr = ip_newsockaddr (&sadrlen);
|
|
|
784 stream->remotehost = /* get socket's peer name */
|
|
|
785 getpeername (stream->tcpsi,sadr,(void *) &sadrlen) ?
|
|
|
786 cpystr (stream->host) : tcp_name (sadr,NIL);
|
|
|
787 fs_give ((void **) &sadr);
|
|
|
788 }
|
|
|
789 return stream->remotehost;
|
|
|
790 }
|
|
|
791
|
|
|
792
|
|
|
793 /* TCP/IP return port for this stream
|
|
|
794 * Accepts: TCP/IP stream
|
|
|
795 * Returns: port number for this stream
|
|
|
796 */
|
|
|
797
|
|
|
798 unsigned long tcp_port (TCPSTREAM *stream)
|
|
|
799 {
|
|
|
800 return stream->port; /* return port number */
|
|
|
801 }
|
|
|
802
|
|
|
803
|
|
|
804 /* TCP/IP get local host name
|
|
|
805 * Accepts: TCP/IP stream
|
|
|
806 * Returns: local host name
|
|
|
807 */
|
|
|
808
|
|
|
809 char *tcp_localhost (TCPSTREAM *stream)
|
|
|
810 {
|
|
|
811 if (!stream->localhost) {
|
|
|
812 size_t sadrlen;
|
|
|
813 struct sockaddr *sadr = ip_newsockaddr (&sadrlen);
|
|
|
814 stream->localhost = /* get socket's name */
|
|
|
815 ((stream->port & 0xffff000) ||
|
|
|
816 getsockname (stream->tcpsi,sadr,(void *) &sadrlen)) ?
|
|
|
817 cpystr (mylocalhost ()) : tcp_name (sadr,NIL);
|
|
|
818 fs_give ((void **) &sadr);
|
|
|
819 }
|
|
|
820 return stream->localhost; /* return local host name */
|
|
|
821 }
|
|
|
822
|
|
4
|
823 /* Get $TCPREMOTEHOST || $TCPREMOTEHOST
|
|
|
824 * If invoked via tcpserver or couriertcpd, consult $TCPREMOTEHOST
|
|
|
825 * or $TCPREMOTEIP
|
|
|
826 */
|
|
|
827 char* gettcpremoteip()
|
|
|
828 {
|
|
|
829 if (getenv("TCPREMOTEHOST") && strcmp("0", getenv("TCPREMOTEHOST"))) {
|
|
|
830 return getenv("TCPREMOTEHOST");
|
|
|
831 } else if (getenv("TCPREMOTEIP")) {
|
|
|
832 return getenv("TCPREMOTEIP");
|
|
|
833 }
|
|
|
834 return "NON-IPv4";
|
|
|
835 }
|
|
|
836
|
|
0
|
837 /* TCP/IP get client host address (server calls only)
|
|
|
838 * Returns: client host address
|
|
|
839 */
|
|
|
840
|
|
|
841 char *tcp_clientaddr ()
|
|
|
842 {
|
|
|
843 if (!myClientAddr) {
|
|
|
844 size_t sadrlen;
|
|
|
845 struct sockaddr *sadr = ip_newsockaddr (&sadrlen);
|
|
|
846 if (getpeername (0,sadr,(void *) &sadrlen))
|
|
|
847 myClientAddr = cpystr ("UNKNOWN");
|
|
|
848 else { /* get stdin's peer name */
|
|
|
849 myClientAddr = cpystr (ip_sockaddrtostring (sadr));
|
|
|
850 if (myClientPort < 0) myClientPort = ip_sockaddrtoport (sadr);
|
|
|
851 }
|
|
|
852 fs_give ((void **) &sadr);
|
|
|
853 }
|
|
|
854 return myClientAddr;
|
|
|
855 }
|
|
|
856
|
|
|
857
|
|
|
858 /* TCP/IP get client host name (server calls only)
|
|
|
859 * Returns: client host name
|
|
|
860 */
|
|
|
861
|
|
|
862 char *tcp_clienthost ()
|
|
|
863 {
|
|
|
864 if (!myClientHost) {
|
|
|
865 size_t sadrlen;
|
|
|
866 struct sockaddr *sadr = ip_newsockaddr (&sadrlen);
|
|
4
|
867 #ifdef INET6
|
|
|
868 if (getenv("TCPREMOTEIP")) {
|
|
|
869 myClientHost =
|
|
|
870 cpystr((getenv("TCPREMOTEHOST")
|
|
|
871 && strcasecmp("UNKNOWN", getenv("TCPREMOTEHOST")))
|
|
|
872 ? getenv("TCPREMOTEHOST")
|
|
|
873 : getenv("TCPREMOTEIP"));
|
|
|
874 } else
|
|
|
875 #endif
|
|
0
|
876 if (getpeername (0,sadr,(void *) &sadrlen)) {
|
|
|
877 char *s,*t,*v,tmp[MAILTMPLEN];
|
|
|
878 if ((s = getenv (t = "SSH_CLIENT")) ||
|
|
|
879 (s = getenv (t = "KRB5REMOTEADDR")) ||
|
|
|
880 (s = getenv (t = "SSH2_CLIENT"))) {
|
|
|
881 if (v = strchr (s,' ')) *v = '\0';
|
|
|
882 sprintf (v = tmp,"%.80s=%.80s",t,s);
|
|
|
883 }
|
|
|
884 else v = "UNKNOWN";
|
|
|
885 myClientHost = cpystr (v);
|
|
|
886 }
|
|
|
887 else { /* get stdin's peer name */
|
|
|
888 myClientHost = tcp_name (sadr,T);
|
|
|
889 if (!myClientAddr) myClientAddr = cpystr (ip_sockaddrtostring (sadr));
|
|
|
890 if (myClientPort < 0) myClientPort = ip_sockaddrtoport (sadr);
|
|
|
891 }
|
|
|
892 fs_give ((void **) &sadr);
|
|
|
893 }
|
|
|
894 return myClientHost;
|
|
|
895 }
|
|
|
896
|
|
|
897
|
|
|
898 /* TCP/IP get client port number (server calls only)
|
|
|
899 * Returns: client port number
|
|
|
900 */
|
|
|
901
|
|
|
902 long tcp_clientport ()
|
|
|
903 {
|
|
|
904 if (!myClientHost && !myClientAddr) tcp_clientaddr ();
|
|
|
905 return myClientPort;
|
|
|
906 }
|
|
|
907
|
|
|
908 /* TCP/IP get server host address (server calls only)
|
|
|
909 * Returns: server host address
|
|
|
910 */
|
|
|
911
|
|
|
912 char *tcp_serveraddr ()
|
|
|
913 {
|
|
|
914 if (!myServerAddr) {
|
|
|
915 size_t sadrlen;
|
|
|
916 struct sockaddr *sadr = ip_newsockaddr (&sadrlen);
|
|
|
917 if (getsockname (0,sadr,(void *) &sadrlen))
|
|
|
918 myServerAddr = cpystr ("UNKNOWN");
|
|
|
919 else { /* get stdin's name */
|
|
|
920 myServerAddr = cpystr (ip_sockaddrtostring (sadr));
|
|
|
921 if (myServerPort < 0) myServerPort = ip_sockaddrtoport (sadr);
|
|
|
922 }
|
|
|
923 fs_give ((void **) &sadr);
|
|
|
924 }
|
|
|
925 return myServerAddr;
|
|
|
926 }
|
|
|
927
|
|
|
928
|
|
|
929 /* TCP/IP get server host name (server calls only)
|
|
|
930 * Returns: server host name
|
|
|
931 */
|
|
|
932
|
|
|
933 char *tcp_serverhost ()
|
|
|
934 {
|
|
|
935 if (!myServerHost) { /* once-only */
|
|
|
936 size_t sadrlen;
|
|
|
937 struct sockaddr *sadr = ip_newsockaddr (&sadrlen);
|
|
|
938 /* get stdin's name */
|
|
4
|
939 if (getsockname (0,sadr,(void *) &sadrlen) ||
|
|
|
940 (myServerPort = ip_sockaddrtoport (sadr)) < 0)
|
|
0
|
941 myServerHost = cpystr (mylocalhost ());
|
|
|
942 else { /* get stdin's name */
|
|
|
943 myServerHost = tcp_name (sadr,NIL);
|
|
|
944 if (!myServerAddr) myServerAddr = cpystr (ip_sockaddrtostring (sadr));
|
|
|
945 if (myServerPort < 0) myServerPort = ip_sockaddrtoport (sadr);
|
|
|
946 }
|
|
|
947 fs_give ((void **) &sadr);
|
|
|
948 }
|
|
|
949 return myServerHost;
|
|
|
950 }
|
|
|
951
|
|
|
952
|
|
|
953 /* TCP/IP get server port number (server calls only)
|
|
|
954 * Returns: server port number
|
|
|
955 */
|
|
|
956
|
|
|
957 long tcp_serverport ()
|
|
|
958 {
|
|
|
959 if (!myServerHost && !myServerAddr) tcp_serveraddr ();
|
|
|
960 return myServerPort;
|
|
|
961 }
|
|
|
962
|
|
|
963 /* TCP/IP return canonical form of host name
|
|
|
964 * Accepts: host name
|
|
|
965 * Returns: canonical form of host name
|
|
|
966 */
|
|
|
967
|
|
|
968 char *tcp_canonical (char *name)
|
|
|
969 {
|
|
|
970 char *ret,host[MAILTMPLEN];
|
|
|
971 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
|
|
|
972 void *data;
|
|
|
973 /* look like domain literal? */
|
|
|
974 if (name[0] == '[' && name[strlen (name) - 1] == ']') return name;
|
|
|
975 (*bn) (BLOCK_DNSLOOKUP,NIL); /* quell alarms */
|
|
|
976 data = (*bn) (BLOCK_SENSITIVE,NIL);
|
|
|
977 if (tcpdebug) {
|
|
|
978 sprintf (host,"DNS canonicalization %.80s",name);
|
|
|
979 mm_log (host,TCPDEBUG);
|
|
|
980 }
|
|
|
981 /* get canonical name */
|
|
|
982 if (!ip_nametoaddr (name,NIL,NIL,&ret,NIL)) ret = name;
|
|
|
983 (*bn) (BLOCK_NONSENSITIVE,data);
|
|
|
984 (*bn) (BLOCK_NONE,NIL); /* alarms OK now */
|
|
|
985 if (tcpdebug) mm_log ("DNS canonicalization done",TCPDEBUG);
|
|
|
986 return ret;
|
|
|
987 }
|
|
|
988
|
|
|
989 /* TCP/IP return name from socket
|
|
|
990 * Accepts: socket
|
|
|
991 * verbose flag
|
|
|
992 * Returns: cpystr name
|
|
|
993 */
|
|
|
994
|
|
|
995 char *tcp_name (struct sockaddr *sadr,long flag)
|
|
|
996 {
|
|
|
997 char *ret,*t,adr[MAILTMPLEN],tmp[MAILTMPLEN];
|
|
|
998 sprintf (ret = adr,"[%.80s]",ip_sockaddrtostring (sadr));
|
|
|
999 if (allowreversedns) {
|
|
|
1000 blocknotify_t bn = (blocknotify_t)mail_parameters(NIL,GET_BLOCKNOTIFY,NIL);
|
|
|
1001 void *data;
|
|
|
1002 if (tcpdebug) {
|
|
|
1003 sprintf (tmp,"Reverse DNS resolution %s",adr);
|
|
|
1004 mm_log (tmp,TCPDEBUG);
|
|
|
1005 }
|
|
|
1006 (*bn) (BLOCK_DNSLOOKUP,NIL);/* quell alarms */
|
|
|
1007 data = (*bn) (BLOCK_SENSITIVE,NIL);
|
|
|
1008 /* translate address to name */
|
|
|
1009 if (t = tcp_name_valid (ip_sockaddrtoname (sadr))) {
|
|
|
1010 /* produce verbose form if needed */
|
|
|
1011 if (flag) sprintf (ret = tmp,"%s %s",t,adr);
|
|
|
1012 else ret = t;
|
|
|
1013 }
|
|
|
1014 (*bn) (BLOCK_NONSENSITIVE,data);
|
|
|
1015 (*bn) (BLOCK_NONE,NIL); /* alarms OK now */
|
|
|
1016 if (tcpdebug) mm_log ("Reverse DNS resolution done",TCPDEBUG);
|
|
|
1017 }
|
|
|
1018 return cpystr (ret);
|
|
|
1019 }
|
|
|
1020
|
|
|
1021
|
|
|
1022 /* TCP/IP validate name
|
|
|
1023 * Accepts: domain name
|
|
|
1024 * Returns: name if valid, NIL otherwise
|
|
|
1025 */
|
|
|
1026
|
|
|
1027 char *tcp_name_valid (char *s)
|
|
|
1028 {
|
|
|
1029 int c;
|
|
|
1030 char *ret,*tail;
|
|
|
1031 /* must be non-empty and not too long */
|
|
|
1032 if ((ret = (s && *s) ? s : NIL) && (tail = ret + NETMAXHOST)) {
|
|
|
1033 /* must be alnum, dot, or hyphen */
|
|
|
1034 while ((c = *s++) && (s <= tail) &&
|
|
|
1035 (((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z')) ||
|
|
|
1036 ((c >= '0') && (c <= '9')) || (c == '-') || (c == '.')));
|
|
|
1037 if (c) ret = NIL;
|
|
|
1038 }
|
|
|
1039 return ret;
|
|
|
1040 }
|
|
|
1041
|
|
|
1042 /* TCP/IP check if client is given host name
|
|
|
1043 * Accepts: candidate host name
|
|
|
1044 * Returns: T if match, NIL otherwise
|
|
|
1045 */
|
|
|
1046
|
|
|
1047 long tcp_isclienthost (char *host)
|
|
|
1048 {
|
|
|
1049 int family;
|
|
|
1050 size_t adrlen,sadrlen,len;
|
|
|
1051 void *adr,*next;
|
|
|
1052 struct sockaddr *sadr;
|
|
|
1053 long ret = NIL;
|
|
|
1054 /* make sure that myClientAddr is set */
|
|
|
1055 if (tcp_clienthost () && myClientAddr)
|
|
|
1056 /* get sockaddr of client */
|
|
|
1057 for (adr = ip_nametoaddr (host,&adrlen,&family,NIL,&next); adr && !ret;
|
|
|
1058 adr = ip_nametoaddr (NIL,&adrlen,&family,NIL,&next)) {
|
|
|
1059 /* build sockaddr of given address */
|
|
|
1060 sadr = ip_sockaddr (family,adr,adrlen,1,&len);
|
|
|
1061 if (!strcmp (myClientAddr,ip_sockaddrtostring (sadr))) ret = LONGT;
|
|
|
1062 fs_give ((void **) &sadr); /* done with client sockaddr */
|
|
|
1063 }
|
|
|
1064 return ret;
|
|
|
1065 }
|
|
|
1066
|
|
|
1067 /* Following statement must be at end of this module */
|
|
|
1068
|
|
|
1069 #undef fork /* undo any use of vfork() */
|
