1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | #if !defined(lint) && !defined(SABER) |
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4 | static const char rcsid[] = "$Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp $"; |
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5 | #endif /* not lint */ |
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6 | |
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7 | /* |
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8 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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9 | * Copyright (c) 1996-1999 by Internet Software Consortium. |
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10 | * |
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11 | * Permission to use, copy, modify, and distribute this software for any |
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12 | * purpose with or without fee is hereby granted, provided that the above |
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13 | * copyright notice and this permission notice appear in all copies. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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16 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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17 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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18 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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19 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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20 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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21 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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22 | */ |
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23 | |
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24 | /*! \file |
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25 | * \brief |
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26 | * Based on the Dynamic DNS reference implementation by Viraj Bais |
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27 | * <viraj_bais@ccm.fm.intel.com> |
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28 | */ |
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29 | |
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30 | #include <sys/cdefs.h> |
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31 | __FBSDID("$FreeBSD$"); |
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32 | |
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33 | #include "port_before.h" |
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34 | |
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35 | #include <rtems/bsd/sys/param.h> |
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36 | #include <sys/socket.h> |
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37 | #include <sys/time.h> |
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38 | |
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39 | #include <netinet/in.h> |
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40 | #include <arpa/inet.h> |
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41 | #include <arpa/nameser.h> |
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42 | |
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43 | #include <errno.h> |
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44 | #include <limits.h> |
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45 | #include <netdb.h> |
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46 | #include <res_update.h> |
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47 | #include <stdarg.h> |
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48 | #include <stdio.h> |
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49 | #include <stdlib.h> |
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50 | #include <string.h> |
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51 | |
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52 | #include <isc/list.h> |
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53 | #include <resolv.h> |
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54 | |
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55 | #include "port_after.h" |
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56 | #include "res_private.h" |
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57 | |
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58 | /*% |
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59 | * Separate a linked list of records into groups so that all records |
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60 | * in a group will belong to a single zone on the nameserver. |
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61 | * Create a dynamic update packet for each zone and send it to the |
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62 | * nameservers for that zone, and await answer. |
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63 | * Abort if error occurs in updating any zone. |
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64 | * Return the number of zones updated on success, < 0 on error. |
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65 | * |
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66 | * On error, caller must deal with the unsynchronized zones |
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67 | * eg. an A record might have been successfully added to the forward |
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68 | * zone but the corresponding PTR record would be missing if error |
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69 | * was encountered while updating the reverse zone. |
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70 | */ |
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71 | |
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72 | struct zonegrp { |
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73 | char z_origin[MAXDNAME]; |
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74 | ns_class z_class; |
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75 | union res_sockaddr_union z_nsaddrs[MAXNS]; |
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76 | int z_nscount; |
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77 | int z_flags; |
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78 | LIST(ns_updrec) z_rrlist; |
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79 | LINK(struct zonegrp) z_link; |
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80 | }; |
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81 | |
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82 | #define ZG_F_ZONESECTADDED 0x0001 |
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83 | |
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84 | /* Forward. */ |
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85 | |
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86 | static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2); |
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87 | |
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88 | /* Macros. */ |
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89 | |
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90 | #define DPRINTF(x) do {\ |
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91 | int save_errno = errno; \ |
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92 | if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \ |
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93 | errno = save_errno; \ |
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94 | } while (0) |
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95 | |
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96 | /* Public. */ |
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97 | |
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98 | int |
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99 | res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) { |
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100 | ns_updrec *rrecp; |
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101 | u_char answer[PACKETSZ]; |
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102 | u_char *packet; |
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103 | struct zonegrp *zptr, tgrp; |
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104 | LIST(struct zonegrp) zgrps; |
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105 | int nzones = 0, nscount = 0, n; |
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106 | union res_sockaddr_union nsaddrs[MAXNS]; |
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107 | |
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108 | packet = malloc(NS_MAXMSG); |
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109 | if (packet == NULL) { |
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110 | DPRINTF(("malloc failed")); |
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111 | return (0); |
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112 | } |
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113 | /* Thread all of the updates onto a list of groups. */ |
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114 | INIT_LIST(zgrps); |
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115 | memset(&tgrp, 0, sizeof (tgrp)); |
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116 | for (rrecp = rrecp_in; rrecp; |
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117 | rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) { |
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118 | int nscnt; |
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119 | /* Find the origin for it if there is one. */ |
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120 | tgrp.z_class = rrecp->r_class; |
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121 | nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class, |
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122 | RES_EXHAUSTIVE, tgrp.z_origin, |
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123 | sizeof tgrp.z_origin, |
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124 | tgrp.z_nsaddrs, MAXNS); |
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125 | if (nscnt <= 0) { |
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126 | DPRINTF(("res_findzonecut failed (%d)", nscnt)); |
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127 | goto done; |
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128 | } |
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129 | tgrp.z_nscount = nscnt; |
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130 | /* Find the group for it if there is one. */ |
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131 | for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) |
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132 | if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 && |
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133 | tgrp.z_class == zptr->z_class) |
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134 | break; |
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135 | /* Make a group for it if there isn't one. */ |
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136 | if (zptr == NULL) { |
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137 | zptr = malloc(sizeof *zptr); |
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138 | if (zptr == NULL) { |
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139 | DPRINTF(("malloc failed")); |
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140 | goto done; |
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141 | } |
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142 | *zptr = tgrp; |
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143 | zptr->z_flags = 0; |
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144 | INIT_LINK(zptr, z_link); |
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145 | INIT_LIST(zptr->z_rrlist); |
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146 | APPEND(zgrps, zptr, z_link); |
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147 | } |
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148 | /* Thread this rrecp onto the right group. */ |
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149 | APPEND(zptr->z_rrlist, rrecp, r_glink); |
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150 | } |
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151 | |
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152 | for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) { |
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153 | /* Construct zone section and prepend it. */ |
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154 | rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin, |
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155 | zptr->z_class, ns_t_soa, 0); |
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156 | if (rrecp == NULL) { |
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157 | DPRINTF(("res_mkupdrec failed")); |
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158 | goto done; |
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159 | } |
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160 | PREPEND(zptr->z_rrlist, rrecp, r_glink); |
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161 | zptr->z_flags |= ZG_F_ZONESECTADDED; |
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162 | |
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163 | /* Marshall the update message. */ |
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164 | n = res_nmkupdate(statp, HEAD(zptr->z_rrlist), |
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165 | packet, NS_MAXMSG); |
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166 | DPRINTF(("res_mkupdate -> %d", n)); |
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167 | if (n < 0) |
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168 | goto done; |
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169 | |
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170 | /* Temporarily replace the resolver's nameserver set. */ |
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171 | nscount = res_getservers(statp, nsaddrs, MAXNS); |
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172 | res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount); |
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173 | |
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174 | /* Send the update and remember the result. */ |
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175 | if (key != NULL) { |
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176 | #ifdef _LIBC |
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177 | DPRINTF(("TSIG is not supported\n")); |
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178 | RES_SET_H_ERRNO(statp, NO_RECOVERY); |
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179 | goto done; |
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180 | #else |
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181 | n = res_nsendsigned(statp, packet, n, key, |
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182 | answer, sizeof answer); |
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183 | #endif |
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184 | } else |
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185 | n = res_nsend(statp, packet, n, answer, sizeof answer); |
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186 | if (n < 0) { |
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187 | DPRINTF(("res_nsend: send error, n=%d (%s)\n", |
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188 | n, strerror(errno))); |
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189 | goto done; |
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190 | } |
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191 | if (((HEADER *)answer)->rcode == NOERROR) |
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192 | nzones++; |
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193 | |
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194 | /* Restore resolver's nameserver set. */ |
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195 | res_setservers(statp, nsaddrs, nscount); |
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196 | nscount = 0; |
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197 | } |
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198 | done: |
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199 | while (!EMPTY(zgrps)) { |
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200 | zptr = HEAD(zgrps); |
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201 | if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0) |
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202 | res_freeupdrec(HEAD(zptr->z_rrlist)); |
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203 | UNLINK(zgrps, zptr, z_link); |
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204 | free(zptr); |
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205 | } |
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206 | if (nscount != 0) |
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207 | res_setservers(statp, nsaddrs, nscount); |
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208 | |
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209 | free(packet); |
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210 | return (nzones); |
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211 | } |
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212 | |
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213 | /* Private. */ |
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214 | |
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215 | static void |
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216 | res_dprintf(const char *fmt, ...) { |
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217 | va_list ap; |
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218 | |
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219 | va_start(ap, fmt); |
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220 | fputs(";; res_nupdate: ", stderr); |
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221 | vfprintf(stderr, fmt, ap); |
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222 | fputc('\n', stderr); |
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223 | va_end(ap); |
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224 | } |
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