FreeCalypso > hg > themwi-system-sw

comparison mgw/readconf.c @ 32:b3f74df7b808

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beginning of themwi-mgw
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Jul 2022 22:51:44 -0800
parents
children f280328e7e2e
comparison
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31:08d7794cdd0a 32:b3f74df7b808
1 /*
2 * In this module we implement the reading of /var/gsm/themwi-mgw.cfg:
3 * we parse and save the configured IP address and port range for each
4 * of our two sides, GSM and PSTN.
5 */
6
7 #include <sys/types.h>
8 #include <sys/socket.h>
9 #include <netinet/in.h>
10 #include <arpa/inet.h>
11 #include <ctype.h>
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <strings.h>
16 #include "struct.h"
17
18 struct bind_range_cfg bind_range_gsm, bind_range_pstn;
19
20 static char config_file_pathname[] = "/var/gsm/themwi-mgw.cfg";
21
22 struct parse_state {
23 int lineno;
24 int set_mask;
25 };
26
27 static void
28 handle_bind_ip(st, kw, brc, line)
29 struct parse_state *st;
30 char *kw, *line;
31 struct bind_range_cfg *brc;
32 {
33 char *cp, *np;
34
35 for (cp = line; isspace(*cp); cp++)
36 ;
37 if (*cp == '\0' || *cp == '#') {
38 inv_syntax: fprintf(stderr,
39 "%s line %d: %s setting requires one argument\n",
40 config_file_pathname, st->lineno, kw);
41 exit(1);
42 }
43 for (np = cp; *cp && !isspace(*cp); cp++)
44 ;
45 if (*cp)
46 *cp++ = '\0';
47 while (isspace(*cp))
48 cp++;
49 if (*cp != '\0' && *cp != '#')
50 goto inv_syntax;
51 brc->bind_ip.s_addr = inet_addr(np);
52 if (brc->bind_ip.s_addr == INADDR_NONE) {
53 fprintf(stderr,
54 "%s line %d: invalid IP address argument \"%s\"\n",
55 config_file_pathname, st->lineno, np);
56 exit(1);
57 }
58 }
59
60 static void
61 handle_port_range(st, kw, brc, line)
62 struct parse_state *st;
63 char *kw, *line;
64 struct bind_range_cfg *brc;
65 {
66 char *cp, *np1, *np2;
67
68 for (cp = line; isspace(*cp); cp++)
69 ;
70 if (!isdigit(*cp)) {
71 inv_syntax: fprintf(stderr,
72 "%s line %d: %s setting requires two numeric arguments\n",
73 config_file_pathname, st->lineno, kw);
74 exit(1);
75 }
76 for (np1 = cp; isdigit(*cp); cp++)
77 ;
78 if (!isspace(*cp))
79 goto inv_syntax;
80 while (isspace(*cp))
81 cp++;
82 if (!isdigit(*cp))
83 goto inv_syntax;
84 for (np2 = cp; isdigit(*cp); cp++)
85 ;
86 if (*cp && !isspace(*cp))
87 goto inv_syntax;
88 while (isspace(*cp))
89 cp++;
90 if (*cp != '\0' && *cp != '#')
91 goto inv_syntax;
92 brc->port_range_start = atoi(np1);
93 brc->port_range_end = atoi(np2);
94 if (brc->port_range_start & 1) {
95 fprintf(stderr, "%s line %d: start port must be even\n",
96 config_file_pathname, st->lineno);
97 exit(1);
98 }
99 if (!(brc->port_range_end & 1)) {
100 fprintf(stderr, "%s line %d: end port must be odd\n",
101 config_file_pathname, st->lineno);
102 exit(1);
103 }
104 if (brc->port_range_end <= brc->port_range_start) {
105 fprintf(stderr,
106 "%s line %d: end port must be greater than start port\n",
107 config_file_pathname, st->lineno);
108 exit(1);
109 }
110 brc->port_next = brc->port_range_start;
111 brc->port_tries = (brc->port_range_end - brc->port_range_start + 1) / 2;
112 }
113
114 static void
115 process_line(st, line)
116 struct parse_state *st;
117 char *line;
118 {
119 char *cp, *np;
120 void (*handler)();
121 struct bind_range_cfg *ipside;
122 int set_id;
123
124 if (!index(line, '\n')) {
125 fprintf(stderr, "%s line %d: too long or missing newline\n",
126 config_file_pathname, st->lineno);
127 exit(1);
128 }
129 for (cp = line; isspace(*cp); cp++)
130 ;
131 if (*cp == '\0' || *cp == '#')
132 return;
133 for (np = cp; *cp && !isspace(*cp); cp++)
134 ;
135 if (*cp)
136 *cp++ = '\0';
137 if (!strcmp(np, "gsm-ip-addr")) {
138 handler = handle_bind_ip;
139 ipside = &bind_range_gsm;
140 set_id = 1;
141 } else if (!strcmp(np, "gsm-port-range")) {
142 handler = handle_port_range;
143 ipside = &bind_range_gsm;
144 set_id = 2;
145 } else if (!strcmp(np, "pstn-ip-addr")) {
146 handler = handle_bind_ip;
147 ipside = &bind_range_pstn;
148 set_id = 4;
149 } else if (!strcmp(np, "pstn-port-range")) {
150 handler = handle_port_range;
151 ipside = &bind_range_pstn;
152 set_id = 8;
153 } else {
154 fprintf(stderr, "%s line %d: non-understood keyword \"%s\"\n",
155 config_file_pathname, st->lineno, np);
156 exit(1);
157 }
158 if (st->set_mask & set_id) {
159 fprintf(stderr, "%s line %d: duplicate %s setting\n",
160 config_file_pathname, st->lineno, np);
161 exit(1);
162 }
163 handler(st, np, ipside, cp);
164 st->set_mask |= set_id;
165 }
166
167 read_config_file()
168 {
169 FILE *inf;
170 struct parse_state pst;
171 char linebuf[256];
172
173 inf = fopen(config_file_pathname, "r");
174 if (!inf) {
175 perror(config_file_pathname);
176 exit(1);
177 }
178 pst.set_mask = 0;
179 for (pst.lineno = 1; fgets(linebuf, sizeof linebuf, inf); pst.lineno++)
180 process_line(&pst, linebuf);
181 fclose(inf);
182 if (pst.set_mask != 15) {
183 fprintf(stderr, "error: %s did not set all required settings\n",
184 config_file_pathname);
185 exit(1);
186 }
187 }