FreeCalypso > hg > themwi-system-sw

annotate sip-in/readconf.c @ 103:3b3f07b112f3

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mgw: implement GSM to PSTN forwarding
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Sep 2022 20:46:19 -0800
parents a9137bdb6047
children ce3b1db7d1d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
47
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1 /*
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2 * In this module we implement the reading of /var/gsm/themwi-sip-in.cfg:
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3 * the main settings are bind-ip and bind-port, but we also have some
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4 * optional config settings.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/socket.h>
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9 #include <netinet/in.h>
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10 #include <arpa/inet.h>
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11 #include <ctype.h>
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12 #include <stdio.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <strings.h>
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16
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17 struct in_addr sip_bind_ip;
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18 unsigned sip_bind_port;
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19 int cfg_use_100rel;
68
709b78a4ebf0 sip-in: implement retransmission of INVITE responses
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20 unsigned cfg_retrans_timeout = 500;
709b78a4ebf0 sip-in: implement retransmission of INVITE responses
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21 unsigned cfg_retrans_count = 10;
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a9137bdb6047 sip-in: make BYE Max-Forwards configurable
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22 unsigned max_forwards = 70;
47
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23
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24 static char config_file_pathname[] = "/var/gsm/themwi-sip-in.cfg";
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25
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26 struct parse_state {
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27 int lineno;
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28 int set_mask;
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29 };
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30
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31 static void
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32 require_one_arg(st, kw, arg)
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33 struct parse_state *st;
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34 char *kw, *arg;
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35 {
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36 char *cp;
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37
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38 if (*arg == '\0' || *arg == '#') {
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39 inv_syntax: fprintf(stderr,
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40 "%s line %d: %s setting requires one argument\n",
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41 config_file_pathname, st->lineno, kw);
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42 exit(1);
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43 }
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44 for (cp = arg; *cp && !isspace(*cp); cp++)
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45 ;
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46 if (*cp)
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47 *cp++ = '\0';
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48 while (isspace(*cp))
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49 cp++;
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50 if (*cp != '\0' && *cp != '#')
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51 goto inv_syntax;
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52 }
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53
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54 static void
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55 handle_ip(st, kw, arg, var)
47
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56 struct parse_state *st;
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57 char *kw, *arg;
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58 struct in_addr *var;
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59 {
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60 require_one_arg(st, kw, arg);
47
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61 var->s_addr = inet_addr(arg);
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62 if (var->s_addr == INADDR_NONE) {
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63 fprintf(stderr,
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64 "%s line %d: invalid IP address argument \"%s\"\n",
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65 config_file_pathname, st->lineno, arg);
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66 exit(1);
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67 }
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68 }
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69
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70 static void
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71 handle_num(st, kw, arg, var)
47
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72 struct parse_state *st;
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73 char *kw, *arg;
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74 unsigned *var;
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75 {
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76 char *endp;
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77
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78 require_one_arg(st, kw, arg);
47
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79 *var = strtoul(arg, &endp, 10);
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80 if (*endp) {
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81 fprintf(stderr, "%s line %d: invalid numeric argument \"%s\"\n",
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82 config_file_pathname, st->lineno, arg);
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83 exit(1);
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84 }
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85 }
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86
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87 static void
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88 handle_bool(st, kw, arg, var)
47
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89 struct parse_state *st;
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90 char *kw, *arg;
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91 int *var;
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92 {
89
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93 require_one_arg(st, kw, arg);
47
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94 if (!strcmp(arg, "true") || !strcmp(arg, "on") || !strcmp(arg, "yes")
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95 || !strcmp(arg, "1")) {
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96 *var = 1;
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97 return;
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98 }
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99 if (!strcmp(arg, "false") || !strcmp(arg, "off") || !strcmp(arg, "no")
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100 || !strcmp(arg, "0")) {
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101 *var = 0;
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102 return;
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103 }
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104 fprintf(stderr, "%s line %d: invalid boolean argument \"%s\"\n",
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105 config_file_pathname, st->lineno, arg);
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106 exit(1);
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107 }
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108
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109 static void
91
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110 handle_retrans_conf(st, kw, arg)
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111 struct parse_state *st;
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112 char *kw, *arg;
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113 {
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114 char *cp = arg;
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115
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116 if (!isdigit(*cp)) {
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117 inv: fprintf(stderr,
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118 "%s line %d: %s setting requires two numeric arguments\n",
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119 config_file_pathname, st->lineno, kw);
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120 exit(1);
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121 }
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122 cfg_retrans_timeout = strtoul(cp, &cp, 10);
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parents: 90
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123 while (isspace(*cp))
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124 cp++;
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125 if (!isdigit(*cp))
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126 goto inv;
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127 cfg_retrans_count = strtoul(cp, &cp, 10);
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128 while (isspace(*cp))
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129 cp++;
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130 if (*cp != '\0' && *cp != '#')
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131 goto inv;
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132 }
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133
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134 static void
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135 process_line(st, line)
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136 struct parse_state *st;
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137 char *line;
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138 {
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139 char *cp, *kw;
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140 void (*handler)(), *var;
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141 int set_id;
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142
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143 if (!index(line, '\n')) {
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144 fprintf(stderr, "%s line %d: too long or missing newline\n",
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145 config_file_pathname, st->lineno);
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146 exit(1);
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147 }
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148 for (cp = line; isspace(*cp); cp++)
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149 ;
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150 if (*cp == '\0' || *cp == '#')
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151 return;
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152 for (kw = cp; *cp && !isspace(*cp); cp++)
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153 ;
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154 if (*cp)
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155 *cp++ = '\0';
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156 if (!strcmp(kw, "bind-ip")) {
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157 handler = handle_ip;
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158 var = &sip_bind_ip;
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159 set_id = 1;
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160 } else if (!strcmp(kw, "bind-port")) {
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161 handler = handle_num;
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162 var = &sip_bind_port;
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163 set_id = 2;
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164 } else if (!strcmp(kw, "use-100rel")) {
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165 handler = handle_bool;
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166 var = &cfg_use_100rel;
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167 set_id = 0;
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168 } else if (!strcmp(kw, "sip-udp-retrans")) {
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169 handler = handle_retrans_conf;
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170 var = (void *) 0;
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171 set_id = 0;
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172 } else if (!strcmp(kw, "max-forwards")) {
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173 handler = &handle_num;
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174 var = &max_forwards;
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175 set_id = 0;
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176 } else {
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177 fprintf(stderr, "%s line %d: non-understood keyword \"%s\"\n",
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178 config_file_pathname, st->lineno, kw);
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179 exit(1);
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180 }
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181 if (st->set_mask & set_id) {
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182 fprintf(stderr, "%s line %d: duplicate %s setting\n",
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183 config_file_pathname, st->lineno, kw);
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184 exit(1);
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185 }
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186 while (isspace(*cp))
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187 cp++;
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188 handler(st, kw, cp, var);
47
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189 st->set_mask |= set_id;
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190 }
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191
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192 read_config_file()
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193 {
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194 FILE *inf;
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195 struct parse_state pst;
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196 char linebuf[256];
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197
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198 inf = fopen(config_file_pathname, "r");
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199 if (!inf) {
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200 perror(config_file_pathname);
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201 exit(1);
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202 }
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203 pst.set_mask = 0;
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204 for (pst.lineno = 1; fgets(linebuf, sizeof linebuf, inf); pst.lineno++)
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205 process_line(&pst, linebuf);
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206 fclose(inf);
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207 if (pst.set_mask != 3) {
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208 fprintf(stderr, "error: %s did not set all required settings\n",
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209 config_file_pathname);
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210 exit(1);
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211 }
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212 }