Mercurial > dropbear
annotate fake-rfc2553.c @ 1663:c795520269f9
Fallback for key gen without hard link support (#89)
Add a non-atomic fallback for key generation on platforms where link()
is not permitted (such as most stock Android installs) or on filesystems
without hard link support (such as FAT).
| author | Matt Robinson <git@nerdoftheherd.com> |
|---|---|
| date | Sat, 14 Mar 2020 14:37:35 +0000 |
| parents | 9fd27bc37807 |
| children |
| rev | line source |
|---|---|
|
589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
1 /* Taken for Dropbear from OpenSSH 5.5p1 */ |
|
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
2 |
| 64 | 3 /* |
| 4 * Copyright (C) 2000-2003 Damien Miller. All rights reserved. | |
| 5 * Copyright (C) 1999 WIDE Project. All rights reserved. | |
| 6 * | |
| 7 * Redistribution and use in source and binary forms, with or without | |
| 8 * modification, are permitted provided that the following conditions | |
| 9 * are met: | |
| 10 * 1. Redistributions of source code must retain the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer. | |
| 12 * 2. Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * 3. Neither the name of the project nor the names of its contributors | |
| 16 * may be used to endorse or promote products derived from this software | |
| 17 * without specific prior written permission. | |
| 18 * | |
| 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND | |
| 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE | |
| 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 29 * SUCH DAMAGE. | |
| 30 */ | |
| 31 | |
| 32 /* | |
| 33 * Pseudo-implementation of RFC2553 name / address resolution functions | |
| 34 * | |
| 35 * But these functions are not implemented correctly. The minimum subset | |
| 36 * is implemented for ssh use only. For example, this routine assumes | |
| 37 * that ai_family is AF_INET. Don't use it for another purpose. | |
| 38 */ | |
| 39 | |
| 40 #include "includes.h" | |
| 41 | |
|
589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
42 #include <stdlib.h> |
|
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
43 #include <string.h> |
|
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
44 |
|
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
45 #include <netinet/in.h> |
|
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
46 #include <arpa/inet.h> |
| 64 | 47 |
| 48 #ifndef HAVE_GETNAMEINFO | |
| 49 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, | |
| 50 size_t hostlen, char *serv, size_t servlen, int flags) | |
| 51 { | |
| 52 struct sockaddr_in *sin = (struct sockaddr_in *)sa; | |
| 53 struct hostent *hp; | |
| 54 char tmpserv[16]; | |
| 55 | |
|
589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
56 if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET) |
|
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
57 return (EAI_FAMILY); |
| 64 | 58 if (serv != NULL) { |
| 59 snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port)); | |
| 60 if (strlcpy(serv, tmpserv, servlen) >= servlen) | |
| 61 return (EAI_MEMORY); | |
| 62 } | |
| 63 | |
| 64 if (host != NULL) { | |
| 65 if (flags & NI_NUMERICHOST) { | |
| 66 if (strlcpy(host, inet_ntoa(sin->sin_addr), | |
| 67 hostlen) >= hostlen) | |
| 68 return (EAI_MEMORY); | |
| 69 else | |
| 70 return (0); | |
| 71 } else { | |
| 72 hp = gethostbyaddr((char *)&sin->sin_addr, | |
| 73 sizeof(struct in_addr), AF_INET); | |
| 74 if (hp == NULL) | |
| 75 return (EAI_NODATA); | |
| 76 | |
| 77 if (strlcpy(host, hp->h_name, hostlen) >= hostlen) | |
| 78 return (EAI_MEMORY); | |
| 79 else | |
| 80 return (0); | |
| 81 } | |
| 82 } | |
| 83 return (0); | |
| 84 } | |
| 85 #endif /* !HAVE_GETNAMEINFO */ | |
| 86 | |
| 87 #ifndef HAVE_GAI_STRERROR | |
| 88 #ifdef HAVE_CONST_GAI_STRERROR_PROTO | |
| 89 const char * | |
| 90 #else | |
| 91 char * | |
| 92 #endif | |
| 93 gai_strerror(int err) | |
| 94 { | |
| 95 switch (err) { | |
| 96 case EAI_NODATA: | |
| 97 return ("no address associated with name"); | |
| 98 case EAI_MEMORY: | |
| 99 return ("memory allocation failure."); | |
| 100 case EAI_NONAME: | |
| 101 return ("nodename nor servname provided, or not known"); | |
|
589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
102 case EAI_FAMILY: |
|
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
|
103 return ("ai_family not supported"); |
| 64 | 104 default: |
| 105 return ("unknown/invalid error."); | |
| 106 } | |
| 107 } | |
| 108 #endif /* !HAVE_GAI_STRERROR */ | |
| 109 | |
| 110 #ifndef HAVE_FREEADDRINFO | |
| 111 void | |
| 112 freeaddrinfo(struct addrinfo *ai) | |
| 113 { | |
| 114 struct addrinfo *next; | |
| 115 | |
| 116 for(; ai != NULL;) { | |
| 117 next = ai->ai_next; | |
| 118 free(ai); | |
| 119 ai = next; | |
| 120 } | |
| 121 } | |
| 122 #endif /* !HAVE_FREEADDRINFO */ | |
| 123 | |
| 124 #ifndef HAVE_GETADDRINFO | |
| 125 static struct | |
| 126 addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints) | |
| 127 { | |
| 128 struct addrinfo *ai; | |
| 129 | |
| 130 ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in)); | |
| 131 if (ai == NULL) | |
| 132 return (NULL); | |
| 133 | |
| 134 memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in)); | |
| 135 | |
| 136 ai->ai_addr = (struct sockaddr *)(ai + 1); | |
| 137 /* XXX -- ssh doesn't use sa_len */ | |
| 138 ai->ai_addrlen = sizeof(struct sockaddr_in); | |
| 139 ai->ai_addr->sa_family = ai->ai_family = AF_INET; | |
| 140 | |
| 141 ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port; | |
| 142 ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr; | |
| 143 | |
| 144 /* XXX: the following is not generally correct, but does what we want */ | |
| 145 if (hints->ai_socktype) | |
| 146 ai->ai_socktype = hints->ai_socktype; | |
| 147 else | |
| 148 ai->ai_socktype = SOCK_STREAM; | |
| 149 | |
| 150 if (hints->ai_protocol) | |
| 151 ai->ai_protocol = hints->ai_protocol; | |
| 152 | |
| 153 return (ai); | |
| 154 } | |
| 155 | |
| 156 int | |
| 157 getaddrinfo(const char *hostname, const char *servname, | |
| 158 const struct addrinfo *hints, struct addrinfo **res) | |
| 159 { | |
| 160 struct hostent *hp; | |
| 161 struct servent *sp; | |
| 162 struct in_addr in; | |
| 163 int i; | |
| 164 long int port; | |
| 165 u_long addr; | |
| 166 | |
| 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 | 171 if (servname != NULL) { |
| 172 char *cp; | |
| 173 | |
| 174 port = strtol(servname, &cp, 10); | |
| 175 if (port > 0 && port <= 65535 && *cp == '\0') | |
| 176 port = htons(port); | |
| 177 else if ((sp = getservbyname(servname, NULL)) != NULL) | |
| 178 port = sp->s_port; | |
| 179 else | |
| 180 port = 0; | |
| 181 } | |
| 182 | |
| 183 if (hints && hints->ai_flags & AI_PASSIVE) { | |
| 184 addr = htonl(0x00000000); | |
| 185 if (hostname && inet_aton(hostname, &in) != 0) | |
| 186 addr = in.s_addr; | |
| 187 *res = malloc_ai(port, addr, hints); | |
| 188 if (*res == NULL) | |
| 189 return (EAI_MEMORY); | |
| 190 return (0); | |
| 191 } | |
| 192 | |
| 193 if (!hostname) { | |
| 194 *res = malloc_ai(port, htonl(0x7f000001), hints); | |
| 195 if (*res == NULL) | |
| 196 return (EAI_MEMORY); | |
| 197 return (0); | |
| 198 } | |
| 199 | |
| 200 if (inet_aton(hostname, &in)) { | |
| 201 *res = malloc_ai(port, in.s_addr, hints); | |
| 202 if (*res == NULL) | |
| 203 return (EAI_MEMORY); | |
| 204 return (0); | |
| 205 } | |
| 206 | |
| 207 /* Don't try DNS if AI_NUMERICHOST is set */ | |
| 208 if (hints && hints->ai_flags & AI_NUMERICHOST) | |
| 209 return (EAI_NONAME); | |
| 210 | |
| 211 hp = gethostbyname(hostname); | |
| 212 if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { | |
| 213 struct addrinfo *cur, *prev; | |
| 214 | |
| 215 cur = prev = *res = NULL; | |
| 216 for (i = 0; hp->h_addr_list[i]; i++) { | |
| 217 struct in_addr *in = (struct in_addr *)hp->h_addr_list[i]; | |
| 218 | |
| 219 cur = malloc_ai(port, in->s_addr, hints); | |
| 220 if (cur == NULL) { | |
| 221 if (*res != NULL) | |
| 222 freeaddrinfo(*res); | |
| 223 return (EAI_MEMORY); | |
| 224 } | |
| 225 if (prev) | |
| 226 prev->ai_next = cur; | |
| 227 else | |
| 228 *res = cur; | |
| 229 | |
| 230 prev = cur; | |
| 231 } | |
| 232 return (0); | |
| 233 } | |
| 234 | |
| 235 return (EAI_NODATA); | |
| 236 } | |
| 237 #endif /* !HAVE_GETADDRINFO */ |