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1 | office | 1 | /* |
2 | * multilink.c - support routines for multilink. |
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3 | * |
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4 | * Copyright (c) 2000-2002 Paul Mackerras. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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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 | * |
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13 | * 2. The name(s) of the authors of this software must not be used to |
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14 | * endorse or promote products derived from this software without |
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15 | * prior written permission. |
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16 | * |
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17 | * 3. Redistributions of any form whatsoever must retain the following |
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18 | * acknowledgment: |
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19 | * "This product includes software developed by Paul Mackerras |
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20 | * <paulus@samba.org>". |
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21 | * |
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22 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO |
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23 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY |
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24 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
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25 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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26 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN |
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27 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
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28 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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29 | */ |
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30 | |||
31 | #include "netif/ppp/ppp_opts.h" |
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32 | #if PPP_SUPPORT && defined(HAVE_MULTILINK) /* don't build if not configured for use in lwipopts.h */ |
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33 | |||
34 | /* Multilink support |
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35 | * |
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36 | * Multilink uses Samba TDB (Trivial Database Library), which |
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37 | * we cannot port, because it needs a filesystem. |
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38 | * |
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39 | * We have to choose between doing a memory-shared TDB-clone, |
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40 | * or dropping multilink support at all. |
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41 | */ |
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42 | |||
43 | #include <string.h> |
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44 | #include <ctype.h> |
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45 | #include <stdlib.h> |
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46 | #include <netdb.h> |
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47 | #include <errno.h> |
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48 | #include <signal.h> |
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49 | #include <netinet/in.h> |
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50 | #include <unistd.h> |
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51 | |||
52 | #include "netif/ppp/ppp_impl.h" |
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53 | |||
54 | #include "netif/ppp/fsm.h" |
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55 | #include "netif/ppp/lcp.h" |
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56 | #include "netif/ppp/tdb.h" |
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57 | |||
58 | bool endpoint_specified; /* user gave explicit endpoint discriminator */ |
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59 | char *bundle_id; /* identifier for our bundle */ |
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60 | char *blinks_id; /* key for the list of links */ |
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61 | bool doing_multilink; /* multilink was enabled and agreed to */ |
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62 | bool multilink_master; /* we own the multilink bundle */ |
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63 | |||
64 | extern TDB_CONTEXT *pppdb; |
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65 | extern char db_key[]; |
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66 | |||
67 | static void make_bundle_links (int append); |
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68 | static void remove_bundle_link (void); |
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69 | static void iterate_bundle_links (void (*func) (char *)); |
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70 | |||
71 | static int get_default_epdisc (struct epdisc *); |
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72 | static int parse_num (char *str, const char *key, int *valp); |
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73 | static int owns_unit (TDB_DATA pid, int unit); |
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74 | |||
75 | #define set_ip_epdisc(ep, addr) do { \ |
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76 | ep->length = 4; \ |
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77 | ep->value[0] = addr >> 24; \ |
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78 | ep->value[1] = addr >> 16; \ |
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79 | ep->value[2] = addr >> 8; \ |
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80 | ep->value[3] = addr; \ |
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81 | } while (0) |
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82 | |||
83 | #define LOCAL_IP_ADDR(addr) \ |
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84 | (((addr) & 0xff000000) == 0x0a000000 /* 10.x.x.x */ \ |
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85 | || ((addr) & 0xfff00000) == 0xac100000 /* 172.16.x.x */ \ |
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86 | || ((addr) & 0xffff0000) == 0xc0a80000) /* 192.168.x.x */ |
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87 | |||
88 | #define process_exists(n) (kill((n), 0) == 0 || errno != ESRCH) |
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89 | |||
90 | void |
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91 | mp_check_options() |
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92 | { |
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93 | lcp_options *wo = &lcp_wantoptions[0]; |
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94 | lcp_options *ao = &lcp_allowoptions[0]; |
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95 | |||
96 | doing_multilink = 0; |
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97 | if (!multilink) |
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98 | return; |
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99 | /* if we're doing multilink, we have to negotiate MRRU */ |
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100 | if (!wo->neg_mrru) { |
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101 | /* mrru not specified, default to mru */ |
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102 | wo->mrru = wo->mru; |
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103 | wo->neg_mrru = 1; |
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104 | } |
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105 | ao->mrru = ao->mru; |
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106 | ao->neg_mrru = 1; |
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107 | |||
108 | if (!wo->neg_endpoint && !noendpoint) { |
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109 | /* get a default endpoint value */ |
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110 | wo->neg_endpoint = get_default_epdisc(&wo->endpoint); |
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111 | } |
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112 | } |
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113 | |||
114 | /* |
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115 | * Make a new bundle or join us to an existing bundle |
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116 | * if we are doing multilink. |
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117 | */ |
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118 | int |
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119 | mp_join_bundle() |
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120 | { |
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121 | lcp_options *go = &lcp_gotoptions[0]; |
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122 | lcp_options *ho = &lcp_hisoptions[0]; |
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123 | lcp_options *ao = &lcp_allowoptions[0]; |
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124 | int unit, pppd_pid; |
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125 | int l, mtu; |
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126 | char *p; |
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127 | TDB_DATA key, pid, rec; |
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128 | |||
129 | if (doing_multilink) { |
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130 | /* have previously joined a bundle */ |
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131 | if (!go->neg_mrru || !ho->neg_mrru) { |
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132 | notice("oops, didn't get multilink on renegotiation"); |
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133 | lcp_close(pcb, "multilink required"); |
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134 | return 0; |
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135 | } |
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136 | /* XXX should check the peer_authname and ho->endpoint |
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137 | are the same as previously */ |
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138 | return 0; |
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139 | } |
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140 | |||
141 | if (!go->neg_mrru || !ho->neg_mrru) { |
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142 | /* not doing multilink */ |
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143 | if (go->neg_mrru) |
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144 | notice("oops, multilink negotiated only for receive"); |
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145 | mtu = ho->neg_mru? ho->mru: PPP_MRU; |
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146 | if (mtu > ao->mru) |
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147 | mtu = ao->mru; |
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148 | if (demand) { |
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149 | /* already have a bundle */ |
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150 | cfg_bundle(0, 0, 0, 0); |
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151 | netif_set_mtu(pcb, mtu); |
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152 | return 0; |
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153 | } |
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154 | make_new_bundle(0, 0, 0, 0); |
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155 | set_ifunit(1); |
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156 | netif_set_mtu(pcb, mtu); |
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157 | return 0; |
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158 | } |
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159 | |||
160 | doing_multilink = 1; |
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161 | |||
162 | /* |
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163 | * Find the appropriate bundle or join a new one. |
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164 | * First we make up a name for the bundle. |
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165 | * The length estimate is worst-case assuming every |
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166 | * character has to be quoted. |
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167 | */ |
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168 | l = 4 * strlen(peer_authname) + 10; |
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169 | if (ho->neg_endpoint) |
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170 | l += 3 * ho->endpoint.length + 8; |
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171 | if (bundle_name) |
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172 | l += 3 * strlen(bundle_name) + 2; |
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173 | bundle_id = malloc(l); |
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174 | if (bundle_id == 0) |
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175 | novm("bundle identifier"); |
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176 | |||
177 | p = bundle_id; |
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178 | p += slprintf(p, l-1, "BUNDLE=\"%q\"", peer_authname); |
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179 | if (ho->neg_endpoint || bundle_name) |
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180 | *p++ = '/'; |
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181 | if (ho->neg_endpoint) |
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182 | p += slprintf(p, bundle_id+l-p, "%s", |
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183 | epdisc_to_str(&ho->endpoint)); |
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184 | if (bundle_name) |
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185 | p += slprintf(p, bundle_id+l-p, "/%v", bundle_name); |
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186 | |||
187 | /* Make the key for the list of links belonging to the bundle */ |
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188 | l = p - bundle_id; |
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189 | blinks_id = malloc(l + 7); |
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190 | if (blinks_id == NULL) |
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191 | novm("bundle links key"); |
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192 | slprintf(blinks_id, l + 7, "BUNDLE_LINKS=%s", bundle_id + 7); |
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193 | |||
194 | /* |
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195 | * For demand mode, we only need to configure the bundle |
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196 | * and attach the link. |
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197 | */ |
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198 | mtu = LWIP_MIN(ho->mrru, ao->mru); |
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199 | if (demand) { |
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200 | cfg_bundle(go->mrru, ho->mrru, go->neg_ssnhf, ho->neg_ssnhf); |
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201 | netif_set_mtu(pcb, mtu); |
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202 | script_setenv("BUNDLE", bundle_id + 7, 1); |
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203 | return 0; |
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204 | } |
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205 | |||
206 | /* |
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207 | * Check if the bundle ID is already in the database. |
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208 | */ |
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209 | unit = -1; |
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210 | lock_db(); |
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211 | key.dptr = bundle_id; |
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212 | key.dsize = p - bundle_id; |
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213 | pid = tdb_fetch(pppdb, key); |
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214 | if (pid.dptr != NULL) { |
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215 | /* bundle ID exists, see if the pppd record exists */ |
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216 | rec = tdb_fetch(pppdb, pid); |
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217 | if (rec.dptr != NULL && rec.dsize > 0) { |
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218 | /* make sure the string is null-terminated */ |
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219 | rec.dptr[rec.dsize-1] = 0; |
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220 | /* parse the interface number */ |
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221 | parse_num(rec.dptr, "IFNAME=ppp", &unit); |
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222 | /* check the pid value */ |
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223 | if (!parse_num(rec.dptr, "PPPD_PID=", &pppd_pid) |
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224 | || !process_exists(pppd_pid) |
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225 | || !owns_unit(pid, unit)) |
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226 | unit = -1; |
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227 | free(rec.dptr); |
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228 | } |
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229 | free(pid.dptr); |
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230 | } |
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231 | |||
232 | if (unit >= 0) { |
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233 | /* attach to existing unit */ |
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234 | if (bundle_attach(unit)) { |
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235 | set_ifunit(0); |
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236 | script_setenv("BUNDLE", bundle_id + 7, 0); |
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237 | make_bundle_links(1); |
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238 | unlock_db(); |
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239 | info("Link attached to %s", ifname); |
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240 | return 1; |
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241 | } |
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242 | /* attach failed because bundle doesn't exist */ |
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243 | } |
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244 | |||
245 | /* we have to make a new bundle */ |
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246 | make_new_bundle(go->mrru, ho->mrru, go->neg_ssnhf, ho->neg_ssnhf); |
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247 | set_ifunit(1); |
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248 | netif_set_mtu(pcb, mtu); |
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249 | script_setenv("BUNDLE", bundle_id + 7, 1); |
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250 | make_bundle_links(pcb); |
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251 | unlock_db(); |
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252 | info("New bundle %s created", ifname); |
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253 | multilink_master = 1; |
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254 | return 0; |
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255 | } |
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256 | |||
257 | void mp_exit_bundle() |
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258 | { |
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259 | lock_db(); |
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260 | remove_bundle_link(); |
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261 | unlock_db(); |
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262 | } |
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263 | |||
264 | static void sendhup(char *str) |
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265 | { |
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266 | int pid; |
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267 | |||
268 | if (parse_num(str, "PPPD_PID=", &pid) && pid != getpid()) { |
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269 | if (debug) |
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270 | dbglog("sending SIGHUP to process %d", pid); |
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271 | kill(pid, SIGHUP); |
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272 | } |
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273 | } |
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274 | |||
275 | void mp_bundle_terminated() |
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276 | { |
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277 | TDB_DATA key; |
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278 | |||
279 | bundle_terminating = 1; |
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280 | upper_layers_down(pcb); |
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281 | notice("Connection terminated."); |
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282 | #if PPP_STATS_SUPPORT |
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283 | print_link_stats(); |
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284 | #endif /* PPP_STATS_SUPPORT */ |
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285 | if (!demand) { |
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286 | remove_pidfiles(); |
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287 | script_unsetenv("IFNAME"); |
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288 | } |
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289 | |||
290 | lock_db(); |
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291 | destroy_bundle(); |
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292 | iterate_bundle_links(sendhup); |
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293 | key.dptr = blinks_id; |
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294 | key.dsize = strlen(blinks_id); |
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295 | tdb_delete(pppdb, key); |
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296 | unlock_db(); |
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297 | |||
298 | new_phase(PPP_PHASE_DEAD); |
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299 | |||
300 | doing_multilink = 0; |
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301 | multilink_master = 0; |
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302 | } |
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303 | |||
304 | static void make_bundle_links(int append) |
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305 | { |
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306 | TDB_DATA key, rec; |
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307 | char *p; |
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308 | char entry[32]; |
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309 | int l; |
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310 | |||
311 | key.dptr = blinks_id; |
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312 | key.dsize = strlen(blinks_id); |
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313 | slprintf(entry, sizeof(entry), "%s;", db_key); |
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314 | p = entry; |
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315 | if (append) { |
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316 | rec = tdb_fetch(pppdb, key); |
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317 | if (rec.dptr != NULL && rec.dsize > 0) { |
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318 | rec.dptr[rec.dsize-1] = 0; |
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319 | if (strstr(rec.dptr, db_key) != NULL) { |
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320 | /* already in there? strange */ |
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321 | warn("link entry already exists in tdb"); |
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322 | return; |
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323 | } |
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324 | l = rec.dsize + strlen(entry); |
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325 | p = malloc(l); |
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326 | if (p == NULL) |
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327 | novm("bundle link list"); |
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328 | slprintf(p, l, "%s%s", rec.dptr, entry); |
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329 | } else { |
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330 | warn("bundle link list not found"); |
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331 | } |
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332 | if (rec.dptr != NULL) |
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333 | free(rec.dptr); |
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334 | } |
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335 | rec.dptr = p; |
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336 | rec.dsize = strlen(p) + 1; |
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337 | if (tdb_store(pppdb, key, rec, TDB_REPLACE)) |
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338 | error("couldn't %s bundle link list", |
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339 | append? "update": "create"); |
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340 | if (p != entry) |
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341 | free(p); |
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342 | } |
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343 | |||
344 | static void remove_bundle_link() |
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345 | { |
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346 | TDB_DATA key, rec; |
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347 | char entry[32]; |
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348 | char *p, *q; |
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349 | int l; |
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350 | |||
351 | key.dptr = blinks_id; |
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352 | key.dsize = strlen(blinks_id); |
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353 | slprintf(entry, sizeof(entry), "%s;", db_key); |
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354 | |||
355 | rec = tdb_fetch(pppdb, key); |
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356 | if (rec.dptr == NULL || rec.dsize <= 0) { |
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357 | if (rec.dptr != NULL) |
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358 | free(rec.dptr); |
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359 | return; |
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360 | } |
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361 | rec.dptr[rec.dsize-1] = 0; |
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362 | p = strstr(rec.dptr, entry); |
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363 | if (p != NULL) { |
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364 | q = p + strlen(entry); |
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365 | l = strlen(q) + 1; |
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366 | memmove(p, q, l); |
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367 | rec.dsize = p - rec.dptr + l; |
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368 | if (tdb_store(pppdb, key, rec, TDB_REPLACE)) |
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369 | error("couldn't update bundle link list (removal)"); |
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370 | } |
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371 | free(rec.dptr); |
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372 | } |
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373 | |||
374 | static void iterate_bundle_links(void (*func)(char *)) |
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375 | { |
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376 | TDB_DATA key, rec, pp; |
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377 | char *p, *q; |
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378 | |||
379 | key.dptr = blinks_id; |
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380 | key.dsize = strlen(blinks_id); |
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381 | rec = tdb_fetch(pppdb, key); |
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382 | if (rec.dptr == NULL || rec.dsize <= 0) { |
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383 | error("bundle link list not found (iterating list)"); |
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384 | if (rec.dptr != NULL) |
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385 | free(rec.dptr); |
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386 | return; |
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387 | } |
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388 | p = rec.dptr; |
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389 | p[rec.dsize-1] = 0; |
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390 | while ((q = strchr(p, ';')) != NULL) { |
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391 | *q = 0; |
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392 | key.dptr = p; |
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393 | key.dsize = q - p; |
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394 | pp = tdb_fetch(pppdb, key); |
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395 | if (pp.dptr != NULL && pp.dsize > 0) { |
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396 | pp.dptr[pp.dsize-1] = 0; |
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397 | func(pp.dptr); |
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398 | } |
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399 | if (pp.dptr != NULL) |
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400 | free(pp.dptr); |
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401 | p = q + 1; |
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402 | } |
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403 | free(rec.dptr); |
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404 | } |
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405 | |||
406 | static int |
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407 | parse_num(str, key, valp) |
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408 | char *str; |
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409 | const char *key; |
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410 | int *valp; |
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411 | { |
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412 | char *p, *endp; |
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413 | int i; |
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414 | |||
415 | p = strstr(str, key); |
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416 | if (p != 0) { |
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417 | p += strlen(key); |
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418 | i = strtol(p, &endp, 10); |
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419 | if (endp != p && (*endp == 0 || *endp == ';')) { |
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420 | *valp = i; |
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421 | return 1; |
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422 | } |
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423 | } |
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424 | return 0; |
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425 | } |
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426 | |||
427 | /* |
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428 | * Check whether the pppd identified by `key' still owns ppp unit `unit'. |
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429 | */ |
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430 | static int |
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431 | owns_unit(key, unit) |
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432 | TDB_DATA key; |
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433 | int unit; |
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434 | { |
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435 | char ifkey[32]; |
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436 | TDB_DATA kd, vd; |
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437 | int ret = 0; |
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438 | |||
439 | slprintf(ifkey, sizeof(ifkey), "IFNAME=ppp%d", unit); |
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440 | kd.dptr = ifkey; |
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441 | kd.dsize = strlen(ifkey); |
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442 | vd = tdb_fetch(pppdb, kd); |
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443 | if (vd.dptr != NULL) { |
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444 | ret = vd.dsize == key.dsize |
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445 | && memcmp(vd.dptr, key.dptr, vd.dsize) == 0; |
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446 | free(vd.dptr); |
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447 | } |
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448 | return ret; |
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449 | } |
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450 | |||
451 | static int |
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452 | get_default_epdisc(ep) |
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453 | struct epdisc *ep; |
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454 | { |
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455 | char *p; |
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456 | struct hostent *hp; |
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457 | u32_t addr; |
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458 | |||
459 | /* First try for an ethernet MAC address */ |
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460 | p = get_first_ethernet(); |
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461 | if (p != 0 && get_if_hwaddr(ep->value, p) >= 0) { |
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462 | ep->class = EPD_MAC; |
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463 | ep->length = 6; |
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464 | return 1; |
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465 | } |
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466 | |||
467 | /* see if our hostname corresponds to a reasonable IP address */ |
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468 | hp = gethostbyname(hostname); |
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469 | if (hp != NULL) { |
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470 | addr = *(u32_t *)hp->h_addr; |
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471 | if (!bad_ip_adrs(addr)) { |
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472 | addr = lwip_ntohl(addr); |
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473 | if (!LOCAL_IP_ADDR(addr)) { |
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474 | ep->class = EPD_IP; |
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475 | set_ip_epdisc(ep, addr); |
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476 | return 1; |
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477 | } |
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478 | } |
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479 | } |
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480 | |||
481 | return 0; |
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482 | } |
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483 | |||
484 | /* |
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485 | * epdisc_to_str - make a printable string from an endpoint discriminator. |
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486 | */ |
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487 | |||
488 | static char *endp_class_names[] = { |
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489 | "null", "local", "IP", "MAC", "magic", "phone" |
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490 | }; |
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491 | |||
492 | char * |
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493 | epdisc_to_str(ep) |
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494 | struct epdisc *ep; |
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495 | { |
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496 | static char str[MAX_ENDP_LEN*3+8]; |
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497 | u_char *p = ep->value; |
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498 | int i, mask = 0; |
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499 | char *q, c, c2; |
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500 | |||
501 | if (ep->class == EPD_NULL && ep->length == 0) |
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502 | return "null"; |
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503 | if (ep->class == EPD_IP && ep->length == 4) { |
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504 | u32_t addr; |
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505 | |||
506 | GETLONG(addr, p); |
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507 | slprintf(str, sizeof(str), "IP:%I", lwip_htonl(addr)); |
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508 | return str; |
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509 | } |
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510 | |||
511 | c = ':'; |
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512 | c2 = '.'; |
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513 | if (ep->class == EPD_MAC && ep->length == 6) |
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514 | c2 = ':'; |
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515 | else if (ep->class == EPD_MAGIC && (ep->length % 4) == 0) |
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516 | mask = 3; |
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517 | q = str; |
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518 | if (ep->class <= EPD_PHONENUM) |
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519 | q += slprintf(q, sizeof(str)-1, "%s", |
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520 | endp_class_names[ep->class]); |
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521 | else |
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522 | q += slprintf(q, sizeof(str)-1, "%d", ep->class); |
||
523 | c = ':'; |
||
524 | for (i = 0; i < ep->length && i < MAX_ENDP_LEN; ++i) { |
||
525 | if ((i & mask) == 0) { |
||
526 | *q++ = c; |
||
527 | c = c2; |
||
528 | } |
||
529 | q += slprintf(q, str + sizeof(str) - q, "%.2x", ep->value[i]); |
||
530 | } |
||
531 | return str; |
||
532 | } |
||
533 | |||
534 | static int hexc_val(int c) |
||
535 | { |
||
536 | if (c >= 'a') |
||
537 | return c - 'a' + 10; |
||
538 | if (c >= 'A') |
||
539 | return c - 'A' + 10; |
||
540 | return c - '0'; |
||
541 | } |
||
542 | |||
543 | int |
||
544 | str_to_epdisc(ep, str) |
||
545 | struct epdisc *ep; |
||
546 | char *str; |
||
547 | { |
||
548 | int i, l; |
||
549 | char *p, *endp; |
||
550 | |||
551 | for (i = EPD_NULL; i <= EPD_PHONENUM; ++i) { |
||
552 | int sl = strlen(endp_class_names[i]); |
||
553 | if (strncasecmp(str, endp_class_names[i], sl) == 0) { |
||
554 | str += sl; |
||
555 | break; |
||
556 | } |
||
557 | } |
||
558 | if (i > EPD_PHONENUM) { |
||
559 | /* not a class name, try a decimal class number */ |
||
560 | i = strtol(str, &endp, 10); |
||
561 | if (endp == str) |
||
562 | return 0; /* can't parse class number */ |
||
563 | str = endp; |
||
564 | } |
||
565 | ep->class = i; |
||
566 | if (*str == 0) { |
||
567 | ep->length = 0; |
||
568 | return 1; |
||
569 | } |
||
570 | if (*str != ':' && *str != '.') |
||
571 | return 0; |
||
572 | ++str; |
||
573 | |||
574 | if (i == EPD_IP) { |
||
575 | u32_t addr; |
||
576 | i = parse_dotted_ip(str, &addr); |
||
577 | if (i == 0 || str[i] != 0) |
||
578 | return 0; |
||
579 | set_ip_epdisc(ep, addr); |
||
580 | return 1; |
||
581 | } |
||
582 | if (i == EPD_MAC && get_if_hwaddr(ep->value, str) >= 0) { |
||
583 | ep->length = 6; |
||
584 | return 1; |
||
585 | } |
||
586 | |||
587 | p = str; |
||
588 | for (l = 0; l < MAX_ENDP_LEN; ++l) { |
||
589 | if (*str == 0) |
||
590 | break; |
||
591 | if (p <= str) |
||
592 | for (p = str; isxdigit(*p); ++p) |
||
593 | ; |
||
594 | i = p - str; |
||
595 | if (i == 0) |
||
596 | return 0; |
||
597 | ep->value[l] = hexc_val(*str++); |
||
598 | if ((i & 1) == 0) |
||
599 | ep->value[l] = (ep->value[l] << 4) + hexc_val(*str++); |
||
600 | if (*str == ':' || *str == '.') |
||
601 | ++str; |
||
602 | } |
||
603 | if (*str != 0 || (ep->class == EPD_MAC && l != 6)) |
||
604 | return 0; |
||
605 | ep->length = l; |
||
606 | return 1; |
||
607 | } |
||
608 | |||
609 | #endif /* PPP_SUPPORT && HAVE_MULTILINK */ |