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 | #ifndef lint |
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22 | /* static char rcsid[] = "$Id$"; */ |
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23 | #endif |
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24 | |
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25 | #include <stdio.h> |
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26 | #include <string.h> |
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27 | #include <sys/types.h> |
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28 | #include <sys/time.h> |
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29 | #include <syslog.h> |
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30 | |
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31 | #include "pppd.h" |
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32 | #include "cbcp.h" |
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33 | #include "fsm.h" |
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34 | #include "lcp.h" |
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35 | #include "ipcp.h" |
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36 | |
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37 | /* |
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38 | * Protocol entry points. |
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39 | */ |
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40 | static void cbcp_init __P((int unit)); |
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41 | static void cbcp_open __P((int unit)); |
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42 | static void cbcp_lowerup __P((int unit)); |
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43 | static void cbcp_input __P((int unit, u_char *pkt, int len)); |
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44 | static void cbcp_protrej __P((int unit)); |
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45 | static int cbcp_printpkt __P((u_char *pkt, int len, |
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46 | void (*printer) __P((void *, char *, ...)), |
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47 | void *arg)); |
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48 | |
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49 | struct protent cbcp_protent = { |
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50 | PPP_CBCP, |
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51 | cbcp_init, |
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52 | cbcp_input, |
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53 | cbcp_protrej, |
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54 | cbcp_lowerup, |
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55 | NULL, |
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56 | cbcp_open, |
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57 | NULL, |
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58 | cbcp_printpkt, |
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59 | NULL, |
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60 | 0, |
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61 | "CBCP", |
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62 | NULL, |
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63 | NULL, |
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64 | NULL |
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65 | }; |
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66 | |
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67 | cbcp_state cbcp[NUM_PPP]; |
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68 | |
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69 | /* internal prototypes */ |
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70 | |
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71 | static void cbcp_recvreq __P((cbcp_state *us, char *pckt, int len)); |
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72 | static void cbcp_resp __P((cbcp_state *us)); |
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73 | static void cbcp_up __P((cbcp_state *us)); |
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74 | static void cbcp_recvack __P((cbcp_state *us, char *pckt, int len)); |
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75 | static void cbcp_send __P((cbcp_state *us, u_char code, u_char *buf, int len)); |
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76 | |
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77 | /* init state */ |
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78 | static void |
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79 | cbcp_init(iface) |
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80 | int iface; |
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81 | { |
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82 | cbcp_state *us; |
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83 | |
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84 | us = &cbcp[iface]; |
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85 | memset(us, 0, sizeof(cbcp_state)); |
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86 | us->us_unit = iface; |
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87 | us->us_type |= (1 << CB_CONF_NO); |
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88 | } |
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89 | |
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90 | /* lower layer is up */ |
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91 | static void |
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92 | cbcp_lowerup(iface) |
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93 | int iface; |
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94 | { |
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95 | cbcp_state *us = &cbcp[iface]; |
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96 | |
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97 | |
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98 | syslog(LOG_DEBUG, "cbcp_lowerup"); |
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99 | syslog(LOG_DEBUG, "want: %d", us->us_type); |
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100 | |
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101 | if (us->us_type == CB_CONF_USER) |
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102 | syslog(LOG_DEBUG, "phone no: %s", us->us_number); |
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103 | } |
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104 | |
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105 | static void |
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106 | cbcp_open(unit) |
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107 | int unit; |
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108 | { |
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109 | syslog(LOG_DEBUG, "cbcp_open"); |
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110 | } |
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111 | |
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112 | /* process an incomming packet */ |
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113 | static void |
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114 | cbcp_input(unit, inpacket, pktlen) |
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115 | int unit; |
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116 | u_char *inpacket; |
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117 | int pktlen; |
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118 | { |
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119 | u_char *inp; |
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120 | u_char code, id; |
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121 | u_short len; |
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122 | |
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123 | cbcp_state *us = &cbcp[unit]; |
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124 | |
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125 | inp = inpacket; |
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126 | |
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127 | if (pktlen < CBCP_MINLEN) { |
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128 | syslog(LOG_ERR, "CBCP packet is too small"); |
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129 | return; |
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130 | } |
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131 | |
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132 | GETCHAR(code, inp); |
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133 | GETCHAR(id, inp); |
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134 | GETSHORT(len, inp); |
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135 | |
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136 | #if 0 |
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137 | if (len > pktlen) { |
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138 | syslog(LOG_ERR, "CBCP packet: invalid length"); |
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139 | return; |
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140 | } |
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141 | #endif |
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142 | |
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143 | len -= CBCP_MINLEN; |
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144 | |
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145 | switch(code) { |
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146 | case CBCP_REQ: |
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147 | us->us_id = id; |
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148 | cbcp_recvreq(us, inp, len); |
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149 | break; |
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150 | |
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151 | case CBCP_RESP: |
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152 | syslog(LOG_DEBUG, "CBCP_RESP received"); |
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153 | break; |
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154 | |
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155 | case CBCP_ACK: |
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156 | if (id != us->us_id) |
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157 | syslog(LOG_DEBUG, "id doesn't match: expected %d recv %d", |
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158 | us->us_id, id); |
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159 | |
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160 | cbcp_recvack(us, inp, len); |
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161 | break; |
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162 | |
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163 | default: |
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164 | break; |
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165 | } |
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166 | } |
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167 | |
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168 | /* protocol was rejected by foe */ |
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169 | void cbcp_protrej(int iface) |
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170 | { |
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171 | } |
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172 | |
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173 | char *cbcp_codenames[] = { |
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174 | "Request", "Response", "Ack" |
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175 | }; |
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176 | |
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177 | char *cbcp_optionnames[] = { |
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178 | "NoCallback", |
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179 | "UserDefined", |
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180 | "AdminDefined", |
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181 | "List" |
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182 | }; |
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183 | |
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184 | /* pretty print a packet */ |
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185 | static int |
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186 | cbcp_printpkt(p, plen, printer, arg) |
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187 | u_char *p; |
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188 | int plen; |
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189 | void (*printer) __P((void *, char *, ...)); |
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190 | void *arg; |
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191 | { |
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192 | int code, opt, id, len, olen, delay; |
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193 | u_char *pstart; |
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194 | |
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195 | if (plen < HEADERLEN) |
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196 | return 0; |
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197 | pstart = p; |
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198 | GETCHAR(code, p); |
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199 | GETCHAR(id, p); |
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200 | GETSHORT(len, p); |
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201 | if (len < HEADERLEN || len > plen) |
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202 | return 0; |
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203 | |
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204 | if (code >= 1 && code <= sizeof(cbcp_codenames) / sizeof(char *)) |
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205 | printer(arg, " %s", cbcp_codenames[code-1]); |
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206 | else |
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207 | printer(arg, " code=0x%x", code); |
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208 | |
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209 | printer(arg, " id=0x%x", id); |
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210 | len -= HEADERLEN; |
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211 | |
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212 | switch (code) { |
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213 | case CBCP_REQ: |
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214 | case CBCP_RESP: |
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215 | case CBCP_ACK: |
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216 | while(len >= 2) { |
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217 | GETCHAR(opt, p); |
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218 | GETCHAR(olen, p); |
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219 | |
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220 | if (olen < 2 || olen > len) { |
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221 | break; |
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222 | } |
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223 | |
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224 | printer(arg, " <"); |
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225 | len -= olen; |
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226 | |
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227 | if (opt >= 1 && opt <= sizeof(cbcp_optionnames) / sizeof(char *)) |
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228 | printer(arg, " %s", cbcp_optionnames[opt-1]); |
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229 | else |
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230 | printer(arg, " option=0x%x", opt); |
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231 | |
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232 | if (olen > 2) { |
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233 | GETCHAR(delay, p); |
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234 | printer(arg, " delay = %d", delay); |
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235 | } |
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236 | |
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237 | if (olen > 3) { |
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238 | int addrt; |
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239 | char str[256]; |
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240 | |
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241 | GETCHAR(addrt, p); |
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242 | memcpy(str, p, olen - 4); |
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243 | str[olen - 4] = 0; |
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244 | printer(arg, " number = %s", str); |
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245 | } |
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246 | printer(arg, ">"); |
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247 | break; |
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248 | } |
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249 | |
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250 | default: |
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251 | break; |
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252 | } |
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253 | |
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254 | for (; len > 0; --len) { |
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255 | GETCHAR(code, p); |
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256 | printer(arg, " %.2x", code); |
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257 | } |
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258 | |
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259 | return p - pstart; |
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260 | } |
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261 | |
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262 | /* received CBCP request */ |
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263 | static void |
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264 | cbcp_recvreq(us, pckt, pcktlen) |
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265 | cbcp_state *us; |
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266 | char *pckt; |
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267 | int pcktlen; |
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268 | { |
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269 | u_char type, opt_len, delay, addr_type; |
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270 | char address[256]; |
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271 | int len = pcktlen; |
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272 | |
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273 | address[0] = 0; |
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274 | |
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275 | while (len) { |
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276 | syslog(LOG_DEBUG, "length: %d", len); |
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277 | |
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278 | GETCHAR(type, pckt); |
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279 | GETCHAR(opt_len, pckt); |
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280 | |
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281 | if (opt_len > 2) |
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282 | GETCHAR(delay, pckt); |
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283 | |
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284 | us->us_allowed |= (1 << type); |
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285 | |
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286 | switch(type) { |
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287 | case CB_CONF_NO: |
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288 | syslog(LOG_DEBUG, "no callback allowed"); |
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289 | break; |
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290 | |
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291 | case CB_CONF_USER: |
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292 | syslog(LOG_DEBUG, "user callback allowed"); |
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293 | if (opt_len > 4) { |
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294 | GETCHAR(addr_type, pckt); |
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295 | memcpy(address, pckt, opt_len - 4); |
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296 | address[opt_len - 4] = 0; |
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297 | if (address[0]) |
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298 | syslog(LOG_DEBUG, "address: %s", address); |
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299 | } |
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300 | break; |
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301 | |
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302 | case CB_CONF_ADMIN: |
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303 | syslog(LOG_DEBUG, "user admin defined allowed"); |
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304 | break; |
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305 | |
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306 | case CB_CONF_LIST: |
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307 | break; |
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308 | } |
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309 | len -= opt_len; |
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310 | } |
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311 | |
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312 | cbcp_resp(us); |
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313 | } |
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314 | |
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315 | static void |
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316 | cbcp_resp(us) |
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317 | cbcp_state *us; |
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318 | { |
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319 | u_char cb_type; |
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320 | u_char buf[256]; |
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321 | u_char *bufp = buf; |
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322 | int len = 0; |
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323 | |
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324 | cb_type = us->us_allowed & us->us_type; |
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325 | syslog(LOG_DEBUG, "cbcp_resp cb_type=%d", cb_type); |
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326 | |
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327 | #if 0 |
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328 | if (!cb_type) |
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329 | lcp_down(us->us_unit); |
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330 | #endif |
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331 | |
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332 | if (cb_type & ( 1 << CB_CONF_USER ) ) { |
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333 | syslog(LOG_DEBUG, "cbcp_resp CONF_USER"); |
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334 | PUTCHAR(CB_CONF_USER, bufp); |
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335 | len = 3 + 1 + strlen(us->us_number) + 1; |
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336 | PUTCHAR(len , bufp); |
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337 | PUTCHAR(5, bufp); /* delay */ |
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338 | PUTCHAR(1, bufp); |
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339 | BCOPY(us->us_number, bufp, strlen(us->us_number) + 1); |
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340 | cbcp_send(us, CBCP_RESP, buf, len); |
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341 | return; |
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342 | } |
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343 | |
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344 | if (cb_type & ( 1 << CB_CONF_ADMIN ) ) { |
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345 | syslog(LOG_DEBUG, "cbcp_resp CONF_ADMIN"); |
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346 | PUTCHAR(CB_CONF_ADMIN, bufp); |
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347 | len = 3 + 1; |
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348 | PUTCHAR(len , bufp); |
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349 | PUTCHAR(5, bufp); /* delay */ |
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350 | PUTCHAR(0, bufp); |
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351 | cbcp_send(us, CBCP_RESP, buf, len); |
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352 | return; |
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353 | } |
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354 | |
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355 | if (cb_type & ( 1 << CB_CONF_NO ) ) { |
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356 | syslog(LOG_DEBUG, "cbcp_resp CONF_NO"); |
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357 | PUTCHAR(CB_CONF_NO, bufp); |
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358 | len = 3; |
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359 | PUTCHAR(len , bufp); |
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360 | PUTCHAR(0, bufp); |
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361 | cbcp_send(us, CBCP_RESP, buf, len); |
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362 | (*ipcp_protent.open)(us->us_unit); |
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363 | return; |
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364 | } |
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365 | } |
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366 | |
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367 | static void |
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368 | cbcp_send(us, code, buf, len) |
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369 | cbcp_state *us; |
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370 | u_char code; |
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371 | u_char *buf; |
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372 | int len; |
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373 | { |
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374 | u_char *outp; |
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375 | int outlen; |
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376 | |
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377 | outp = outpacket_buf; |
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378 | |
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379 | outlen = 4 + len; |
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380 | |
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381 | MAKEHEADER(outp, PPP_CBCP); |
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382 | |
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383 | PUTCHAR(code, outp); |
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384 | PUTCHAR(us->us_id, outp); |
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385 | PUTSHORT(outlen, outp); |
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386 | |
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387 | if (len) |
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388 | BCOPY(buf, outp, len); |
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389 | |
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390 | output(us->us_unit, outpacket_buf, outlen + PPP_HDRLEN); |
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391 | } |
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392 | |
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393 | static void |
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394 | cbcp_recvack(us, pckt, len) |
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395 | cbcp_state *us; |
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396 | char *pckt; |
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397 | int len; |
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398 | { |
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399 | u_char type, delay, addr_type; |
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400 | int opt_len; |
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401 | char address[256]; |
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402 | |
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403 | if (len) { |
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404 | GETCHAR(type, pckt); |
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405 | GETCHAR(opt_len, pckt); |
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406 | |
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407 | if (opt_len > 2) |
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408 | GETCHAR(delay, pckt); |
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409 | |
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410 | if (opt_len > 4) { |
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411 | GETCHAR(addr_type, pckt); |
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412 | memcpy(address, pckt, opt_len - 4); |
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413 | address[opt_len - 4] = 0; |
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414 | if (address[0]) |
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415 | syslog(LOG_DEBUG, "peer will call: %s", address); |
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416 | } |
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417 | } |
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418 | |
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419 | cbcp_up(us); |
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420 | } |
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421 | |
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422 | extern int persist; |
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423 | |
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424 | /* ok peer will do callback */ |
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425 | static void |
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426 | cbcp_up(us) |
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427 | cbcp_state *us; |
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428 | { |
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429 | persist = 0; |
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430 | lcp_close(0, "Call me back, please"); |
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431 | } |
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