annotate fake-rfc2553.c @ 1853:2be3115a8762 default tip main master

debugging test runner authorized_keys perms
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Oct 2021 13:45:59 +0800
parents 9fd27bc37807
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
589
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1 /* Taken for Dropbear from OpenSSH 5.5p1 */
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2
64
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3 /*
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4 * Copyright (C) 2000-2003 Damien Miller. All rights reserved.
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5 * Copyright (C) 1999 WIDE Project. All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 * 3. Neither the name of the project nor the names of its contributors
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16 * may be used to endorse or promote products derived from this software
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17 * without specific prior written permission.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 * SUCH DAMAGE.
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30 */
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31
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32 /*
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33 * Pseudo-implementation of RFC2553 name / address resolution functions
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34 *
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35 * But these functions are not implemented correctly. The minimum subset
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36 * is implemented for ssh use only. For example, this routine assumes
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37 * that ai_family is AF_INET. Don't use it for another purpose.
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38 */
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39
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40 #include "includes.h"
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41
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42 #include <stdlib.h>
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43 #include <string.h>
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44
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45 #include <netinet/in.h>
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46 #include <arpa/inet.h>
64
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47
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48 #ifndef HAVE_GETNAMEINFO
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49 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
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50 size_t hostlen, char *serv, size_t servlen, int flags)
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51 {
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52 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
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53 struct hostent *hp;
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54 char tmpserv[16];
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55
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56 if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET)
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57 return (EAI_FAMILY);
64
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58 if (serv != NULL) {
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59 snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
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60 if (strlcpy(serv, tmpserv, servlen) >= servlen)
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61 return (EAI_MEMORY);
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62 }
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63
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64 if (host != NULL) {
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65 if (flags & NI_NUMERICHOST) {
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66 if (strlcpy(host, inet_ntoa(sin->sin_addr),
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67 hostlen) >= hostlen)
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68 return (EAI_MEMORY);
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69 else
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70 return (0);
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71 } else {
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72 hp = gethostbyaddr((char *)&sin->sin_addr,
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73 sizeof(struct in_addr), AF_INET);
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74 if (hp == NULL)
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75 return (EAI_NODATA);
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76
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77 if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
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78 return (EAI_MEMORY);
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79 else
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80 return (0);
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81 }
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82 }
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83 return (0);
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84 }
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85 #endif /* !HAVE_GETNAMEINFO */
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86
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87 #ifndef HAVE_GAI_STRERROR
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88 #ifdef HAVE_CONST_GAI_STRERROR_PROTO
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89 const char *
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90 #else
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91 char *
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92 #endif
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93 gai_strerror(int err)
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94 {
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95 switch (err) {
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96 case EAI_NODATA:
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97 return ("no address associated with name");
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98 case EAI_MEMORY:
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99 return ("memory allocation failure.");
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100 case EAI_NONAME:
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101 return ("nodename nor servname provided, or not known");
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102 case EAI_FAMILY:
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103 return ("ai_family not supported");
64
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104 default:
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105 return ("unknown/invalid error.");
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106 }
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107 }
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108 #endif /* !HAVE_GAI_STRERROR */
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109
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110 #ifndef HAVE_FREEADDRINFO
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111 void
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112 freeaddrinfo(struct addrinfo *ai)
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113 {
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114 struct addrinfo *next;
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115
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116 for(; ai != NULL;) {
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117 next = ai->ai_next;
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118 free(ai);
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119 ai = next;
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120 }
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121 }
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122 #endif /* !HAVE_FREEADDRINFO */
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123
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124 #ifndef HAVE_GETADDRINFO
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125 static struct
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126 addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints)
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127 {
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128 struct addrinfo *ai;
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129
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130 ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in));
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131 if (ai == NULL)
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132 return (NULL);
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133
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134 memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in));
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135
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136 ai->ai_addr = (struct sockaddr *)(ai + 1);
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137 /* XXX -- ssh doesn't use sa_len */
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138 ai->ai_addrlen = sizeof(struct sockaddr_in);
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139 ai->ai_addr->sa_family = ai->ai_family = AF_INET;
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140
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141 ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
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142 ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
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143
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144 /* XXX: the following is not generally correct, but does what we want */
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145 if (hints->ai_socktype)
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146 ai->ai_socktype = hints->ai_socktype;
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147 else
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148 ai->ai_socktype = SOCK_STREAM;
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149
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150 if (hints->ai_protocol)
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151 ai->ai_protocol = hints->ai_protocol;
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152
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153 return (ai);
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154 }
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155
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156 int
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157 getaddrinfo(const char *hostname, const char *servname,
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158 const struct addrinfo *hints, struct addrinfo **res)
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159 {
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160 struct hostent *hp;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 struct servent *sp;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 struct in_addr in;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 int i;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 long int port;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 u_long addr;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 port = 0;
589
9fd27bc37807 - Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents: 67
diff changeset
168 if (hints && hints->ai_family != AF_UNSPEC &&
9fd27bc37807 - Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents: 67
diff changeset
169 hints->ai_family != AF_INET)
9fd27bc37807 - Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents: 67
diff changeset
170 return (EAI_FAMILY);
64
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 if (servname != NULL) {
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 char *cp;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 port = strtol(servname, &cp, 10);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 if (port > 0 && port <= 65535 && *cp == '\0')
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 port = htons(port);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 else if ((sp = getservbyname(servname, NULL)) != NULL)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 port = sp->s_port;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 else
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 port = 0;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 if (hints && hints->ai_flags & AI_PASSIVE) {
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 addr = htonl(0x00000000);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 if (hostname && inet_aton(hostname, &in) != 0)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 addr = in.s_addr;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 *res = malloc_ai(port, addr, hints);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 if (*res == NULL)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 return (EAI_MEMORY);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190 return (0);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 if (!hostname) {
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194 *res = malloc_ai(port, htonl(0x7f000001), hints);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195 if (*res == NULL)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 return (EAI_MEMORY);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
197 return (0);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 if (inet_aton(hostname, &in)) {
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 *res = malloc_ai(port, in.s_addr, hints);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 if (*res == NULL)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 return (EAI_MEMORY);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 return (0);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207 /* Don't try DNS if AI_NUMERICHOST is set */
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 if (hints && hints->ai_flags & AI_NUMERICHOST)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 return (EAI_NONAME);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 hp = gethostbyname(hostname);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 struct addrinfo *cur, *prev;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 cur = prev = *res = NULL;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 for (i = 0; hp->h_addr_list[i]; i++) {
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 struct in_addr *in = (struct in_addr *)hp->h_addr_list[i];
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 cur = malloc_ai(port, in->s_addr, hints);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 if (cur == NULL) {
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 if (*res != NULL)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 freeaddrinfo(*res);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 return (EAI_MEMORY);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 if (prev)
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 prev->ai_next = cur;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 else
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 *res = cur;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 prev = cur;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 return (0);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 return (EAI_NODATA);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 #endif /* !HAVE_GETADDRINFO */