annotate mgw/readconf.c @ 197:73bbe7da45cd

add LICENSE
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 26 Mar 2023 15:29:48 -0800
parents f062c32a5116
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
32
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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2 * In this module we implement the reading of /var/gsm/themwi-mgw.cfg:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * we parse and save the configured IP address and port range for each
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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4 * of our two sides, GSM and PSTN.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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6
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Mychaela Falconia <falcon@freecalypso.org>
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7 #include <sys/types.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <sys/socket.h>
127
f062c32a5116 mgw: implement DTMF
Mychaela Falconia <falcon@freecalypso.org>
parents: 95
diff changeset
9 #include <sys/time.h>
32
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 #include <netinet/in.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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11 #include <arpa/inet.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 #include <ctype.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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13 #include <stdio.h>
95
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
14 #include <stdint.h>
32
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 #include "struct.h"
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 struct bind_range_cfg bind_range_gsm, bind_range_pstn;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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21
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 static char config_file_pathname[] = "/var/gsm/themwi-mgw.cfg";
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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23
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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24 struct parse_state {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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25 int lineno;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 int set_mask;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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27 };
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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29 static void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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30 handle_bind_ip(st, kw, brc, line)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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31 struct parse_state *st;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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32 char *kw, *line;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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33 struct bind_range_cfg *brc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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34 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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35 char *cp, *np;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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36
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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37 for (cp = line; isspace(*cp); cp++)
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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38 ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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39 if (*cp == '\0' || *cp == '#') {
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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40 inv_syntax: fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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41 "%s line %d: %s setting requires one argument\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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42 config_file_pathname, st->lineno, kw);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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43 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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44 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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45 for (np = cp; *cp && !isspace(*cp); cp++)
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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46 ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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47 if (*cp)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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48 *cp++ = '\0';
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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49 while (isspace(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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50 cp++;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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51 if (*cp != '\0' && *cp != '#')
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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52 goto inv_syntax;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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53 brc->bind_ip.s_addr = inet_addr(np);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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54 if (brc->bind_ip.s_addr == INADDR_NONE) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 fprintf(stderr,
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 "%s line %d: invalid IP address argument \"%s\"\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 config_file_pathname, st->lineno, np);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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58 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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59 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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60 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 static void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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63 handle_port_range(st, kw, brc, line)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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64 struct parse_state *st;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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65 char *kw, *line;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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66 struct bind_range_cfg *brc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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67 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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68 char *cp, *np1, *np2;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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69
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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70 for (cp = line; isspace(*cp); cp++)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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71 ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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72 if (!isdigit(*cp)) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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73 inv_syntax: fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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74 "%s line %d: %s setting requires two numeric arguments\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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75 config_file_pathname, st->lineno, kw);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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76 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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77 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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78 for (np1 = cp; isdigit(*cp); cp++)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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79 ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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80 if (!isspace(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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81 goto inv_syntax;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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82 while (isspace(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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83 cp++;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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84 if (!isdigit(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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85 goto inv_syntax;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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86 for (np2 = cp; isdigit(*cp); cp++)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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87 ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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88 if (*cp && !isspace(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 goto inv_syntax;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 while (isspace(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 cp++;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
92 if (*cp != '\0' && *cp != '#')
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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93 goto inv_syntax;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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94 brc->port_range_start = atoi(np1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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95 brc->port_range_end = atoi(np2);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
96 if (brc->port_range_start & 1) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
97 fprintf(stderr, "%s line %d: start port must be even\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
98 config_file_pathname, st->lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99 exit(1);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 if (!(brc->port_range_end & 1)) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
102 fprintf(stderr, "%s line %d: end port must be odd\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103 config_file_pathname, st->lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 exit(1);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 if (brc->port_range_end <= brc->port_range_start) {
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 "%s line %d: end port must be greater than start port\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 config_file_pathname, st->lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 exit(1);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 brc->port_next = brc->port_range_start;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 brc->port_tries = (brc->port_range_end - brc->port_range_start + 1) / 2;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 static void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 process_line(st, line)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 struct parse_state *st;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 char *line;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 char *cp, *np;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 void (*handler)();
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 struct bind_range_cfg *ipside;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 int set_id;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 if (!index(line, '\n')) {
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 fprintf(stderr, "%s line %d: too long or missing newline\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 config_file_pathname, st->lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 exit(1);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 }
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 for (cp = line; isspace(*cp); cp++)
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 ;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 if (*cp == '\0' || *cp == '#')
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 return;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 for (np = cp; *cp && !isspace(*cp); cp++)
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 ;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 if (*cp)
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 *cp++ = '\0';
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 if (!strcmp(np, "gsm-ip-addr")) {
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 handler = handle_bind_ip;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 ipside = &bind_range_gsm;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 set_id = 1;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 } else if (!strcmp(np, "gsm-port-range")) {
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 handler = handle_port_range;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 ipside = &bind_range_gsm;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 set_id = 2;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 } else if (!strcmp(np, "pstn-ip-addr")) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 handler = handle_bind_ip;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 ipside = &bind_range_pstn;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 set_id = 4;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 } else if (!strcmp(np, "pstn-port-range")) {
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 handler = handle_port_range;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 ipside = &bind_range_pstn;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 set_id = 8;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 } else {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 fprintf(stderr, "%s line %d: non-understood keyword \"%s\"\n",
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 config_file_pathname, st->lineno, np);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 if (st->set_mask & set_id) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 fprintf(stderr, "%s line %d: duplicate %s setting\n",
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 config_file_pathname, st->lineno, np);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 exit(1);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 handler(st, np, ipside, cp);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 st->set_mask |= set_id;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 read_config_file()
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 FILE *inf;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 struct parse_state pst;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 char linebuf[256];
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 inf = fopen(config_file_pathname, "r");
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 if (!inf) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 perror(config_file_pathname);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 exit(1);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 pst.set_mask = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 for (pst.lineno = 1; fgets(linebuf, sizeof linebuf, inf); pst.lineno++)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 process_line(&pst, linebuf);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 fclose(inf);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 if (pst.set_mask != 15) {
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 fprintf(stderr, "error: %s did not set all required settings\n",
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 config_file_pathname);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 exit(1);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 }
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 }