|
1 /* |
|
2 * Copyright (c) 2016 Mario de Sousa (msousa@fe.up.pt) |
|
3 * |
|
4 * This file is part of the Modbus library for Beremiz and matiec. |
|
5 * |
|
6 * This Modbus library is free software: you can redistribute it and/or modify |
|
7 * it under the terms of the GNU Lesser General Public License as published by |
|
8 * the Free Software Foundation, either version 3 of the License, or |
|
9 * (at your option) any later version. |
|
10 * |
|
11 * This program is distributed in the hope that it will be useful, but |
|
12 * WITHOUT ANY WARRANTY; without even the implied warranty of |
|
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser |
|
14 * General Public License for more details. |
|
15 * |
|
16 * You should have received a copy of the GNU Lesser General Public License |
|
17 * along with this Modbus library. If not, see <http://www.gnu.org/licenses/>. |
|
18 * |
|
19 * This code is made available on the understanding that it will not be |
|
20 * used in safety-critical situations without a full and competent review. |
|
21 */ |
|
22 |
|
23 |
|
24 /* sin_util.c */ |
|
25 |
|
26 #include "sin_util.h" |
|
27 |
|
28 #include <sys/types.h> |
|
29 #include <sys/socket.h> |
|
30 #include <netinet/in.h> |
|
31 #include <netdb.h> // gethostbyname(), ... |
|
32 #include <errno.h> // errno |
|
33 #include <stdlib.h> // strtoll() |
|
34 #include <ctype.h> // isspace() |
|
35 #include <string.h> // memcpy(), memset() |
|
36 #include <strings.h> // strcasecmp() |
|
37 #include <stdio.h> // perror() |
|
38 |
|
39 #ifndef INADDR_NONE |
|
40 #define INADDR_NONE 0xffffffff |
|
41 #endif |
|
42 |
|
43 /* Last time I (msousa) checked, this was not being defined in QNX */ |
|
44 #ifndef socklen_t |
|
45 typedef unsigned int socklen_t; |
|
46 #endif |
|
47 |
|
48 |
|
49 static inline int str_is_whitespace(const char *str) { |
|
50 const char *s; |
|
51 for (s = str; *s; s++) if (!isspace(*s)) return 0; // non whitespace char found |
|
52 return 1; // all whitespace, or empty "" |
|
53 } |
|
54 |
|
55 /* Convert a string to a number, allowing for leading and trailing whitespace */ |
|
56 /* Number may be in decimal, hexadecimal (leading '0x') or octal (leading '0') format */ |
|
57 static long long str_to_portnum(const char *str) { |
|
58 long long port = 0; |
|
59 char *errstr; |
|
60 #define PORT_MIN 0 |
|
61 #define PORT_MAX 65535 |
|
62 errno = 0; // strtoll() does not set errno to 0 on success!! |
|
63 port = strtoll(str, &errstr, 0 /* accept base 8, 10 and 16 */); |
|
64 if (str == errstr) return -1; // not a number |
|
65 if (errno == ERANGE) return -2; // out of range |
|
66 if (!str_is_whitespace(errstr)) return -1; // not a number (has trailing characters) |
|
67 if ((port < PORT_MIN) || (port > PORT_MAX)) return -2; // out of range |
|
68 return (port); |
|
69 } |
|
70 |
|
71 |
|
72 |
|
73 static int gettypebyname(const char *protocol) { |
|
74 if (strcasecmp(protocol, "tcp") == 0) return SOCK_STREAM; |
|
75 if (strcasecmp(protocol, "udp") == 0) return SOCK_DGRAM; |
|
76 if (strcasecmp(protocol, "raw") == 0) return SOCK_RAW; |
|
77 return SOCK_PACKET; // a deprecated service type, we use here as error. |
|
78 } |
|
79 |
|
80 |
|
81 static int getportbyname(in_port_t *port, const char *service, const char *protocol) { |
|
82 struct servent *se; |
|
83 int32_t tmp; |
|
84 // if service is NULL, "" or string of whitespace, then set port to 0, and return -1. |
|
85 // Used when binding to a random port on the local host... |
|
86 if ( port == NULL) { return -1;} |
|
87 if ( service == NULL) {*port = 0; return -1;} |
|
88 if (str_is_whitespace(service)) {*port = 0; return -1;} |
|
89 if ((se = getservbyname(service, protocol)) != NULL) {*port = se->s_port; return 0;} |
|
90 if ((tmp = str_to_portnum(service)) >= 0) {*port = htons((uint16_t)tmp); return 0;} |
|
91 return -2; |
|
92 } |
|
93 |
|
94 |
|
95 static int getipbyname(struct in_addr *ip_addr, const char *host) { |
|
96 struct hostent *he; |
|
97 // if host is NULL, "", or "*", then set ip_addr to INADDR_ANY, and return -1. |
|
98 // Used when binding to all interfaces on the local host... |
|
99 if ( host == NULL) {ip_addr->s_addr = INADDR_ANY; return -1;} |
|
100 if (str_is_whitespace(host)) {ip_addr->s_addr = INADDR_ANY; return -1;} |
|
101 if (strcmp(host, "*") == 0) {ip_addr->s_addr = INADDR_ANY; return -1;} |
|
102 if ((he = gethostbyname(host)) != NULL) {memcpy((char *)ip_addr, he->h_addr, he->h_length); return 0;} |
|
103 if ((ip_addr->s_addr = inet_addr(host)) != INADDR_NONE) {return 0;} |
|
104 return -2; |
|
105 } |
|
106 |
|
107 |
|
108 |
|
109 |
|
110 |
|
111 int sin_initaddr(struct sockaddr_in *sin, |
|
112 const char *host, int allow_null_host, // 1 => allow host NULL, "" or "*" -> INADDR_ANY |
|
113 const char *service, int allow_null_serv, // 1 => allow serivce NULL or "" -> port = 0 |
|
114 const char *protocol) { |
|
115 int he = allow_null_host?-1:0; |
|
116 int se = allow_null_serv?-1:0; |
|
117 |
|
118 memset((void *)sin, 0, sizeof(sin)); |
|
119 sin->sin_family = AF_INET; |
|
120 |
|
121 if (getportbyname(&(sin->sin_port), service, protocol) < se) return -1; |
|
122 if (getipbyname (&(sin->sin_addr), host) < he) return -1; |
|
123 return 0; |
|
124 } |
|
125 |
|
126 |
|
127 |
|
128 /* Create a socket for the IP protocol family, and connect to remote host. */ |
|
129 int sin_connsock(const char *host, const char *service, const char *protocol) { |
|
130 struct sockaddr_in sin; |
|
131 int s, type; |
|
132 |
|
133 if (sin_initaddr(&sin, host, 0, service, 0, protocol) < 0) return -1; |
|
134 if ((type = gettypebyname(protocol)) == SOCK_PACKET) return -1; |
|
135 /* create the socket */ |
|
136 if ((s = socket(PF_INET, type, 0)) < 0) {perror("socket()"); return -1;} |
|
137 /* connect the socket */ |
|
138 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {perror("connect()"); return -1;} |
|
139 |
|
140 return(s); |
|
141 } |
|
142 |
|
143 |
|
144 |
|
145 |
|
146 /* Create a socket for the IP protocol family, and bind to local host's port. */ |
|
147 int sin_bindsock(const char *host, const char *service, const char *protocol) { |
|
148 struct sockaddr_in sin; |
|
149 int s, type; |
|
150 |
|
151 // TODO allow random port... Needs new input parameter to function interface! |
|
152 if (sin_initaddr(&sin, host, 1, service, 0, protocol) < 0) return -1; |
|
153 if ((type = gettypebyname(protocol)) == SOCK_PACKET) return -1; |
|
154 /* create the socket */ |
|
155 if ((s = socket(PF_INET, type, 0)) < 0) {perror("socket()"); return -1;} |
|
156 /* bind the socket */ |
|
157 if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) {perror("bind()"); return -1;} |
|
158 |
|
159 return(s); |
|
160 } |
|
161 |
|
162 |
|
163 |
|
164 |