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comparison rtp-mgr/readconf.c @ 179:b79d6334f543

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themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Mar 2023 20:19:14 -0800
parents mgw/readconf.c@f062c32a5116
children
comparison
equal deleted inserted replaced
178:b259e2722485 179:b79d6334f543
1 /*
2 * In this module we implement the reading of /var/gsm/themwi-rtp.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 <sys/time.h>
10 #include <netinet/in.h>
11 #include <arpa/inet.h>
12 #include <ctype.h>
13 #include <stdio.h>
14 #include <stdint.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <strings.h>
18 #include "struct.h"
19
20 struct bind_range_cfg bind_range_gsm, bind_range_pstn;
21
22 static char config_file_pathname[] = "/var/gsm/themwi-rtp.cfg";
23
24 struct parse_state {
25 int lineno;
26 int set_mask;
27 };
28
29 static void
30 handle_bind_ip(st, kw, brc, line)
31 struct parse_state *st;
32 char *kw, *line;
33 struct bind_range_cfg *brc;
34 {
35 char *cp, *np;
36
37 for (cp = line; isspace(*cp); cp++)
38 ;
39 if (*cp == '\0' || *cp == '#') {
40 inv_syntax: fprintf(stderr,
41 "%s line %d: %s setting requires one argument\n",
42 config_file_pathname, st->lineno, kw);
43 exit(1);
44 }
45 for (np = cp; *cp && !isspace(*cp); cp++)
46 ;
47 if (*cp)
48 *cp++ = '\0';
49 while (isspace(*cp))
50 cp++;
51 if (*cp != '\0' && *cp != '#')
52 goto inv_syntax;
53 brc->bind_ip.s_addr = inet_addr(np);
54 if (brc->bind_ip.s_addr == INADDR_NONE) {
55 fprintf(stderr,
56 "%s line %d: invalid IP address argument \"%s\"\n",
57 config_file_pathname, st->lineno, np);
58 exit(1);
59 }
60 }
61
62 static void
63 handle_port_range(st, kw, brc, line)
64 struct parse_state *st;
65 char *kw, *line;
66 struct bind_range_cfg *brc;
67 {
68 char *cp, *np1, *np2;
69
70 for (cp = line; isspace(*cp); cp++)
71 ;
72 if (!isdigit(*cp)) {
73 inv_syntax: fprintf(stderr,
74 "%s line %d: %s setting requires two numeric arguments\n",
75 config_file_pathname, st->lineno, kw);
76 exit(1);
77 }
78 for (np1 = cp; isdigit(*cp); cp++)
79 ;
80 if (!isspace(*cp))
81 goto inv_syntax;
82 while (isspace(*cp))
83 cp++;
84 if (!isdigit(*cp))
85 goto inv_syntax;
86 for (np2 = cp; isdigit(*cp); cp++)
87 ;
88 if (*cp && !isspace(*cp))
89 goto inv_syntax;
90 while (isspace(*cp))
91 cp++;
92 if (*cp != '\0' && *cp != '#')
93 goto inv_syntax;
94 brc->port_range_start = atoi(np1);
95 brc->port_range_end = atoi(np2);
96 if (brc->port_range_start & 1) {
97 fprintf(stderr, "%s line %d: start port must be even\n",
98 config_file_pathname, st->lineno);
99 exit(1);
100 }
101 if (!(brc->port_range_end & 1)) {
102 fprintf(stderr, "%s line %d: end port must be odd\n",
103 config_file_pathname, st->lineno);
104 exit(1);
105 }
106 if (brc->port_range_end <= brc->port_range_start) {
107 fprintf(stderr,
108 "%s line %d: end port must be greater than start port\n",
109 config_file_pathname, st->lineno);
110 exit(1);
111 }
112 brc->port_next = brc->port_range_start;
113 brc->port_tries = (brc->port_range_end - brc->port_range_start + 1) / 2;
114 }
115
116 static void
117 process_line(st, line)
118 struct parse_state *st;
119 char *line;
120 {
121 char *cp, *np;
122 void (*handler)();
123 struct bind_range_cfg *ipside;
124 int set_id;
125
126 if (!index(line, '\n')) {
127 fprintf(stderr, "%s line %d: too long or missing newline\n",
128 config_file_pathname, st->lineno);
129 exit(1);
130 }
131 for (cp = line; isspace(*cp); cp++)
132 ;
133 if (*cp == '\0' || *cp == '#')
134 return;
135 for (np = cp; *cp && !isspace(*cp); cp++)
136 ;
137 if (*cp)
138 *cp++ = '\0';
139 if (!strcmp(np, "gsm-ip-addr")) {
140 handler = handle_bind_ip;
141 ipside = &bind_range_gsm;
142 set_id = 1;
143 } else if (!strcmp(np, "gsm-port-range")) {
144 handler = handle_port_range;
145 ipside = &bind_range_gsm;
146 set_id = 2;
147 } else if (!strcmp(np, "pstn-ip-addr")) {
148 handler = handle_bind_ip;
149 ipside = &bind_range_pstn;
150 set_id = 4;
151 } else if (!strcmp(np, "pstn-port-range")) {
152 handler = handle_port_range;
153 ipside = &bind_range_pstn;
154 set_id = 8;
155 } else {
156 fprintf(stderr, "%s line %d: non-understood keyword \"%s\"\n",
157 config_file_pathname, st->lineno, np);
158 exit(1);
159 }
160 if (st->set_mask & set_id) {
161 fprintf(stderr, "%s line %d: duplicate %s setting\n",
162 config_file_pathname, st->lineno, np);
163 exit(1);
164 }
165 handler(st, np, ipside, cp);
166 st->set_mask |= set_id;
167 }
168
169 read_config_file()
170 {
171 FILE *inf;
172 struct parse_state pst;
173 char linebuf[256];
174
175 inf = fopen(config_file_pathname, "r");
176 if (!inf) {
177 perror(config_file_pathname);
178 exit(1);
179 }
180 pst.set_mask = 0;
181 for (pst.lineno = 1; fgets(linebuf, sizeof linebuf, inf); pst.lineno++)
182 process_line(&pst, linebuf);
183 fclose(inf);
184 if (pst.set_mask != 15) {
185 fprintf(stderr, "error: %s did not set all required settings\n",
186 config_file_pathname);
187 exit(1);
188 }
189 }