1 | /* |
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2 | * cbcp - Call Back Configuration Protocol. |
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3 | * |
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4 | * Copyright (c) 1995 Pedro Roque Marques |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms are permitted |
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8 | * provided that the above copyright notice and this paragraph are |
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9 | * duplicated in all such forms and that any documentation, |
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10 | * advertising materials, and other materials related to such |
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11 | * distribution and use acknowledge that the software was developed |
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12 | * by Pedro Roque Marques. The name of the author may not be used to |
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13 | * endorse or promote products derived from this software without |
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14 | * specific prior written permission. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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17 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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18 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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19 | */ |
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20 | |
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21 | #define RCSID "$Id$" |
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22 | |
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23 | #include <stdio.h> |
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24 | #include <string.h> |
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25 | #include <sys/types.h> |
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26 | #include <sys/time.h> |
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27 | |
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28 | #include "pppd.h" |
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29 | #include "cbcp.h" |
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30 | #include "fsm.h" |
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31 | #include "lcp.h" |
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32 | |
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33 | static const char rcsid[] = RCSID; |
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34 | |
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35 | /* |
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36 | * Options. |
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37 | */ |
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38 | static int setcbcp __P((char **)); |
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39 | |
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40 | static option_t cbcp_option_list[] = { |
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41 | { "callback", o_special, setcbcp, |
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42 | "Ask for callback" }, |
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43 | { NULL } |
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44 | }; |
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45 | |
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46 | /* |
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47 | * Protocol entry points. |
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48 | */ |
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49 | static void cbcp_init __P((int unit)); |
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50 | static void cbcp_open __P((int unit)); |
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51 | static void cbcp_lowerup __P((int unit)); |
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52 | static void cbcp_input __P((int unit, u_char *pkt, int len)); |
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53 | static void cbcp_protrej __P((int unit)); |
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54 | static int cbcp_printpkt __P((u_char *pkt, int len, |
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55 | void (*printer) __P((void *, char *, ...)), |
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56 | void *arg)); |
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57 | |
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58 | struct protent cbcp_protent = { |
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59 | PPP_CBCP, |
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60 | cbcp_init, |
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61 | cbcp_input, |
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62 | cbcp_protrej, |
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63 | cbcp_lowerup, |
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64 | NULL, |
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65 | cbcp_open, |
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66 | NULL, |
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67 | cbcp_printpkt, |
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68 | NULL, |
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69 | 0, |
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70 | "CBCP", |
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71 | NULL, |
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72 | cbcp_option_list, |
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73 | NULL, |
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74 | NULL, |
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75 | NULL |
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76 | }; |
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77 | |
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78 | cbcp_state cbcp[NUM_PPP]; |
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79 | |
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80 | /* internal prototypes */ |
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81 | |
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82 | static void cbcp_recvreq __P((cbcp_state *us, char *pckt, int len)); |
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83 | static void cbcp_resp __P((cbcp_state *us)); |
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84 | static void cbcp_up __P((cbcp_state *us)); |
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85 | static void cbcp_recvack __P((cbcp_state *us, char *pckt, int len)); |
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86 | static void cbcp_send __P((cbcp_state *us, u_char code, u_char *buf, int len)); |
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87 | |
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88 | /* option processing */ |
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89 | static int |
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90 | setcbcp(argv) |
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91 | char **argv; |
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92 | { |
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93 | lcp_wantoptions[0].neg_cbcp = 1; |
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94 | cbcp_protent.enabled_flag = 1; |
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95 | cbcp[0].us_number = strdup(*argv); |
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96 | if (cbcp[0].us_number == 0) |
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97 | novm("callback number"); |
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98 | cbcp[0].us_type |= (1 << CB_CONF_USER); |
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99 | cbcp[0].us_type |= (1 << CB_CONF_ADMIN); |
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100 | return (1); |
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101 | } |
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102 | |
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103 | /* init state */ |
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104 | static void |
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105 | cbcp_init(iface) |
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106 | int iface; |
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107 | { |
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108 | cbcp_state *us; |
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109 | |
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110 | us = &cbcp[iface]; |
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111 | memset(us, 0, sizeof(cbcp_state)); |
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112 | us->us_unit = iface; |
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113 | us->us_type |= (1 << CB_CONF_NO); |
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114 | } |
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115 | |
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116 | /* lower layer is up */ |
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117 | static void |
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118 | cbcp_lowerup(iface) |
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119 | int iface; |
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120 | { |
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121 | cbcp_state *us = &cbcp[iface]; |
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122 | |
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123 | dbglog("cbcp_lowerup"); |
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124 | dbglog("want: %d", us->us_type); |
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125 | |
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126 | if (us->us_type == CB_CONF_USER) |
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127 | dbglog("phone no: %s", us->us_number); |
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128 | } |
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129 | |
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130 | static void |
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131 | cbcp_open(unit) |
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132 | int unit; |
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133 | { |
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134 | dbglog("cbcp_open"); |
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135 | } |
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136 | |
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137 | /* process an incomming packet */ |
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138 | static void |
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139 | cbcp_input(unit, inpacket, pktlen) |
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140 | int unit; |
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141 | u_char *inpacket; |
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142 | int pktlen; |
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143 | { |
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144 | u_char *inp; |
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145 | u_char code, id; |
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146 | u_short len; |
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147 | |
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148 | cbcp_state *us = &cbcp[unit]; |
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149 | |
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150 | inp = inpacket; |
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151 | |
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152 | if (pktlen < CBCP_MINLEN) { |
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153 | error("CBCP packet is too small"); |
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154 | return; |
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155 | } |
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156 | |
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157 | GETCHAR(code, inp); |
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158 | GETCHAR(id, inp); |
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159 | GETSHORT(len, inp); |
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160 | |
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161 | #if 0 |
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162 | if (len > pktlen) { |
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163 | error("CBCP packet: invalid length"); |
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164 | return; |
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165 | } |
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166 | #endif |
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167 | |
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168 | len -= CBCP_MINLEN; |
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169 | |
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170 | switch(code) { |
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171 | case CBCP_REQ: |
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172 | us->us_id = id; |
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173 | cbcp_recvreq(us, inp, len); |
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174 | break; |
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175 | |
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176 | case CBCP_RESP: |
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177 | dbglog("CBCP_RESP received"); |
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178 | break; |
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179 | |
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180 | case CBCP_ACK: |
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181 | if (id != us->us_id) |
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182 | dbglog("id doesn't match: expected %d recv %d", |
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183 | us->us_id, id); |
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184 | |
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185 | cbcp_recvack(us, inp, len); |
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186 | break; |
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187 | |
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188 | default: |
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189 | break; |
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190 | } |
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191 | } |
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192 | |
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193 | /* protocol was rejected by foe */ |
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194 | void cbcp_protrej(int iface) |
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195 | { |
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196 | } |
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197 | |
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198 | char *cbcp_codenames[] = { |
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199 | "Request", "Response", "Ack" |
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200 | }; |
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201 | |
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202 | char *cbcp_optionnames[] = { |
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203 | "NoCallback", |
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204 | "UserDefined", |
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205 | "AdminDefined", |
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206 | "List" |
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207 | }; |
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208 | |
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209 | /* pretty print a packet */ |
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210 | static int |
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211 | cbcp_printpkt(p, plen, printer, arg) |
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212 | u_char *p; |
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213 | int plen; |
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214 | void (*printer) __P((void *, char *, ...)); |
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215 | void *arg; |
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216 | { |
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217 | int code, opt, id, len, olen, delay; |
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218 | u_char *pstart; |
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219 | |
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220 | if (plen < HEADERLEN) |
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221 | return 0; |
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222 | pstart = p; |
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223 | GETCHAR(code, p); |
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224 | GETCHAR(id, p); |
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225 | GETSHORT(len, p); |
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226 | if (len < HEADERLEN || len > plen) |
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227 | return 0; |
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228 | |
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229 | if (code >= 1 && code <= sizeof(cbcp_codenames) / sizeof(char *)) |
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230 | printer(arg, " %s", cbcp_codenames[code-1]); |
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231 | else |
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232 | printer(arg, " code=0x%x", code); |
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233 | |
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234 | printer(arg, " id=0x%x", id); |
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235 | len -= HEADERLEN; |
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236 | |
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237 | switch (code) { |
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238 | case CBCP_REQ: |
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239 | case CBCP_RESP: |
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240 | case CBCP_ACK: |
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241 | while(len >= 2) { |
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242 | GETCHAR(opt, p); |
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243 | GETCHAR(olen, p); |
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244 | |
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245 | if (olen < 2 || olen > len) { |
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246 | break; |
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247 | } |
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248 | |
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249 | printer(arg, " <"); |
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250 | len -= olen; |
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251 | |
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252 | if (opt >= 1 && opt <= sizeof(cbcp_optionnames) / sizeof(char *)) |
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253 | printer(arg, " %s", cbcp_optionnames[opt-1]); |
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254 | else |
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255 | printer(arg, " option=0x%x", opt); |
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256 | |
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257 | if (olen > 2) { |
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258 | GETCHAR(delay, p); |
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259 | printer(arg, " delay = %d", delay); |
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260 | } |
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261 | |
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262 | if (olen > 3) { |
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263 | int addrt; |
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264 | char str[256]; |
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265 | |
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266 | GETCHAR(addrt, p); |
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267 | memcpy(str, p, olen - 4); |
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268 | str[olen - 4] = 0; |
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269 | printer(arg, " number = %s", str); |
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270 | } |
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271 | printer(arg, ">"); |
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272 | break; |
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273 | } |
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274 | |
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275 | default: |
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276 | break; |
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277 | } |
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278 | |
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279 | for (; len > 0; --len) { |
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280 | GETCHAR(code, p); |
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281 | printer(arg, " %.2x", code); |
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282 | } |
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283 | |
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284 | return p - pstart; |
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285 | } |
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286 | |
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287 | /* received CBCP request */ |
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288 | static void |
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289 | cbcp_recvreq(us, pckt, pcktlen) |
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290 | cbcp_state *us; |
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291 | char *pckt; |
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292 | int pcktlen; |
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293 | { |
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294 | u_char type, opt_len, delay, addr_type; |
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295 | char address[256]; |
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296 | int len = pcktlen; |
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297 | |
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298 | address[0] = 0; |
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299 | |
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300 | while (len) { |
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301 | dbglog("length: %d", len); |
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302 | |
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303 | GETCHAR(type, pckt); |
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304 | GETCHAR(opt_len, pckt); |
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305 | |
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306 | if (opt_len > 2) |
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307 | GETCHAR(delay, pckt); |
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308 | |
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309 | us->us_allowed |= (1 << type); |
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310 | |
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311 | switch(type) { |
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312 | case CB_CONF_NO: |
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313 | dbglog("no callback allowed"); |
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314 | break; |
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315 | |
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316 | case CB_CONF_USER: |
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317 | dbglog("user callback allowed"); |
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318 | if (opt_len > 4) { |
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319 | GETCHAR(addr_type, pckt); |
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320 | memcpy(address, pckt, opt_len - 4); |
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321 | address[opt_len - 4] = 0; |
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322 | if (address[0]) |
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323 | dbglog("address: %s", address); |
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324 | } |
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325 | break; |
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326 | |
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327 | case CB_CONF_ADMIN: |
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328 | dbglog("user admin defined allowed"); |
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329 | break; |
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330 | |
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331 | case CB_CONF_LIST: |
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332 | break; |
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333 | } |
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334 | len -= opt_len; |
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335 | } |
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336 | |
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337 | cbcp_resp(us); |
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338 | } |
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339 | |
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340 | static void |
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341 | cbcp_resp(us) |
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342 | cbcp_state *us; |
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343 | { |
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344 | u_char cb_type; |
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345 | u_char buf[256]; |
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346 | u_char *bufp = buf; |
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347 | int len = 0; |
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348 | |
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349 | cb_type = us->us_allowed & us->us_type; |
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350 | dbglog("cbcp_resp cb_type=%d", cb_type); |
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351 | |
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352 | #if 0 |
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353 | if (!cb_type) |
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354 | lcp_down(us->us_unit); |
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355 | #endif |
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356 | |
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357 | if (cb_type & ( 1 << CB_CONF_USER ) ) { |
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358 | dbglog("cbcp_resp CONF_USER"); |
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359 | PUTCHAR(CB_CONF_USER, bufp); |
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360 | len = 3 + 1 + strlen(us->us_number) + 1; |
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361 | PUTCHAR(len , bufp); |
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362 | PUTCHAR(5, bufp); /* delay */ |
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363 | PUTCHAR(1, bufp); |
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364 | BCOPY(us->us_number, bufp, strlen(us->us_number) + 1); |
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365 | cbcp_send(us, CBCP_RESP, buf, len); |
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366 | return; |
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367 | } |
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368 | |
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369 | if (cb_type & ( 1 << CB_CONF_ADMIN ) ) { |
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370 | dbglog("cbcp_resp CONF_ADMIN"); |
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371 | PUTCHAR(CB_CONF_ADMIN, bufp); |
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372 | len = 3; |
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373 | PUTCHAR(len, bufp); |
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374 | PUTCHAR(5, bufp); /* delay */ |
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375 | cbcp_send(us, CBCP_RESP, buf, len); |
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376 | return; |
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377 | } |
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378 | |
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379 | if (cb_type & ( 1 << CB_CONF_NO ) ) { |
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380 | dbglog("cbcp_resp CONF_NO"); |
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381 | PUTCHAR(CB_CONF_NO, bufp); |
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382 | len = 3; |
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383 | PUTCHAR(len , bufp); |
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384 | PUTCHAR(0, bufp); |
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385 | cbcp_send(us, CBCP_RESP, buf, len); |
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386 | start_networks(); |
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387 | return; |
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388 | } |
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389 | } |
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390 | |
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391 | static void |
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392 | cbcp_send(us, code, buf, len) |
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393 | cbcp_state *us; |
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394 | u_char code; |
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395 | u_char *buf; |
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396 | int len; |
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397 | { |
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398 | u_char *outp; |
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399 | int outlen; |
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400 | |
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401 | outp = outpacket_buf; |
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402 | |
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403 | outlen = 4 + len; |
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404 | |
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405 | MAKEHEADER(outp, PPP_CBCP); |
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406 | |
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407 | PUTCHAR(code, outp); |
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408 | PUTCHAR(us->us_id, outp); |
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409 | PUTSHORT(outlen, outp); |
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410 | |
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411 | if (len) |
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412 | BCOPY(buf, outp, len); |
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413 | |
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414 | output(us->us_unit, outpacket_buf, outlen + PPP_HDRLEN); |
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415 | } |
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416 | |
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417 | static void |
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418 | cbcp_recvack(us, pckt, len) |
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419 | cbcp_state *us; |
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420 | char *pckt; |
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421 | int len; |
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422 | { |
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423 | u_char type, delay, addr_type; |
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424 | int opt_len; |
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425 | char address[256]; |
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426 | |
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427 | if (len) { |
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428 | GETCHAR(type, pckt); |
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429 | GETCHAR(opt_len, pckt); |
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430 | |
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431 | if (opt_len > 2) |
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432 | GETCHAR(delay, pckt); |
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433 | |
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434 | if (opt_len > 4) { |
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435 | GETCHAR(addr_type, pckt); |
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436 | memcpy(address, pckt, opt_len - 4); |
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437 | address[opt_len - 4] = 0; |
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438 | if (address[0]) |
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439 | dbglog("peer will call: %s", address); |
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440 | } |
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441 | if (type == CB_CONF_NO) |
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442 | return; |
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443 | } |
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444 | |
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445 | cbcp_up(us); |
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446 | } |
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447 | |
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448 | /* ok peer will do callback */ |
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449 | static void |
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450 | cbcp_up(us) |
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451 | cbcp_state *us; |
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452 | { |
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453 | persist = 0; |
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454 | lcp_close(0, "Call me back, please"); |
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455 | status = EXIT_CALLBACK; |
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456 | } |
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