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08a35913 ML |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 Martin Ling <martin-sigrok@earth.li> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU 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, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include "libsigrok.h" | |
21 | #include "libsigrok-internal.h" | |
22 | ||
23 | #include <glib.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
987a0530 ML |
26 | #ifdef _WIN32 |
27 | #include <winsock2.h> | |
28 | #include <ws2tcpip.h> | |
29 | #else | |
08a35913 ML |
30 | #include <sys/socket.h> |
31 | #include <netinet/in.h> | |
32 | #include <arpa/inet.h> | |
33 | #include <netdb.h> | |
987a0530 | 34 | #endif |
08a35913 ML |
35 | #include <errno.h> |
36 | ||
37 | /* Message logging helpers with subsystem-specific prefix string. */ | |
38 | #define LOG_PREFIX "scpi_tcp: " | |
39 | #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args) | |
40 | #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args) | |
41 | #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args) | |
42 | #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args) | |
43 | #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args) | |
44 | ||
45 | struct scpi_tcp { | |
46 | char *address; | |
47 | char *port; | |
48 | int socket; | |
49 | }; | |
50 | ||
51 | SR_PRIV int scpi_tcp_open(void *priv) | |
52 | { | |
53 | struct scpi_tcp *tcp = priv; | |
54 | struct addrinfo hints; | |
55 | struct addrinfo *results, *res; | |
56 | int err; | |
57 | ||
58 | memset(&hints, 0, sizeof(hints)); | |
59 | hints.ai_family = AF_UNSPEC; | |
60 | hints.ai_socktype = SOCK_STREAM; | |
61 | hints.ai_protocol = IPPROTO_TCP; | |
62 | ||
63 | err = getaddrinfo(tcp->address, tcp->port, &hints, &results); | |
64 | ||
65 | if (err) { | |
66 | sr_err("Address lookup failed: %s:%d: %s", tcp->address, tcp->port, | |
67 | gai_strerror(err)); | |
68 | return SR_ERR; | |
69 | } | |
70 | ||
71 | for (res = results; res; res = res->ai_next) { | |
72 | if ((tcp->socket = socket(res->ai_family, res->ai_socktype, | |
73 | res->ai_protocol)) < 0) | |
74 | continue; | |
75 | if (connect(tcp->socket, res->ai_addr, res->ai_addrlen) != 0) { | |
76 | close(tcp->socket); | |
77 | tcp->socket = -1; | |
78 | continue; | |
79 | } | |
80 | break; | |
81 | } | |
82 | ||
83 | freeaddrinfo(results); | |
84 | ||
85 | if (tcp->socket < 0) { | |
86 | sr_err("Failed to connect to %s:%s: %s", tcp->address, tcp->port, | |
87 | strerror(errno)); | |
88 | return SR_ERR; | |
89 | } | |
90 | ||
91 | return SR_OK; | |
92 | } | |
93 | ||
94 | SR_PRIV int scpi_tcp_source_add(void *priv, int events, int timeout, | |
95 | sr_receive_data_callback_t cb, void *cb_data) | |
96 | { | |
97 | struct scpi_tcp *tcp = priv; | |
98 | ||
99 | return sr_source_add(tcp->socket, events, timeout, cb, cb_data); | |
100 | } | |
101 | ||
102 | SR_PRIV int scpi_tcp_source_remove(void *priv) | |
103 | { | |
104 | struct scpi_tcp *tcp = priv; | |
105 | ||
106 | return sr_source_remove(tcp->socket); | |
107 | } | |
108 | ||
109 | SR_PRIV int scpi_tcp_send(void *priv, const char *command) | |
110 | { | |
111 | struct scpi_tcp *tcp = priv; | |
112 | int len, out; | |
b8705e99 | 113 | char *terminated_command; |
08a35913 | 114 | |
b8705e99 ML |
115 | terminated_command = g_strdup_printf("%s\r\n", command); |
116 | len = strlen(terminated_command); | |
117 | out = send(tcp->socket, terminated_command, len, 0); | |
118 | g_free(terminated_command); | |
08a35913 ML |
119 | |
120 | if (out < 0) { | |
121 | sr_err("Send error: %s", strerror(errno)); | |
122 | return SR_ERR; | |
123 | } | |
124 | ||
125 | if (out < len) { | |
126 | sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out, | |
127 | len, command); | |
128 | } | |
129 | ||
130 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
131 | ||
132 | return SR_OK; | |
133 | } | |
134 | ||
135 | SR_PRIV int scpi_tcp_receive(void *priv, char **scpi_response) | |
136 | { | |
137 | struct scpi_tcp *tcp = priv; | |
138 | GString *response; | |
139 | char buf[256]; | |
140 | int len; | |
141 | ||
142 | response = g_string_sized_new(1024); | |
143 | ||
144 | len = recv(tcp->socket, buf, sizeof(buf), 0); | |
145 | ||
146 | if (len < 0) { | |
147 | sr_err("Receive error: %s", strerror(errno)); | |
148 | g_string_free(response, TRUE); | |
149 | return SR_ERR; | |
150 | } | |
151 | ||
b8705e99 | 152 | response = g_string_append_len(response, buf + 4, len - 4); |
08a35913 ML |
153 | |
154 | *scpi_response = response->str; | |
155 | ||
156 | sr_dbg("SCPI response received (length %d): '%.50s'", | |
157 | response->len, response->str); | |
158 | ||
159 | g_string_free(response, FALSE); | |
160 | ||
161 | return SR_OK; | |
162 | } | |
163 | ||
164 | SR_PRIV int scpi_tcp_read(void *priv, char *buf, int maxlen) | |
165 | { | |
166 | struct scpi_tcp *tcp = priv; | |
167 | int len; | |
168 | ||
169 | len = recv(tcp->socket, buf, maxlen, 0); | |
170 | ||
171 | if (len < 0) { | |
172 | sr_err("Receive error: %s", strerror(errno)); | |
173 | return SR_ERR; | |
174 | } | |
175 | ||
176 | return len; | |
177 | } | |
178 | ||
179 | SR_PRIV int scpi_tcp_close(void *priv) | |
180 | { | |
181 | struct scpi_tcp *tcp = priv; | |
182 | ||
183 | if (close(tcp->socket) < 0) | |
184 | return SR_ERR; | |
185 | ||
186 | return SR_OK; | |
187 | } | |
188 | ||
189 | SR_PRIV void scpi_tcp_free(void *priv) | |
190 | { | |
191 | struct scpi_tcp *tcp = priv; | |
192 | ||
193 | g_free(tcp->address); | |
194 | g_free(tcp->port); | |
195 | g_free(tcp); | |
196 | } | |
197 | ||
198 | SR_PRIV struct sr_scpi_dev_inst *scpi_tcp_dev_inst_new(const char *address, | |
199 | const char *port) | |
200 | { | |
201 | struct sr_scpi_dev_inst *scpi; | |
202 | struct scpi_tcp *tcp; | |
203 | ||
204 | scpi = g_malloc(sizeof(struct sr_scpi_dev_inst)); | |
205 | tcp = g_malloc0(sizeof(struct scpi_tcp)); | |
206 | ||
207 | tcp->address = g_strdup(address); | |
208 | tcp->port = g_strdup(port); | |
209 | tcp->socket = -1; | |
210 | ||
211 | scpi->open = scpi_tcp_open; | |
212 | scpi->source_add = scpi_tcp_source_add; | |
213 | scpi->source_remove = scpi_tcp_source_remove; | |
214 | scpi->send = scpi_tcp_send; | |
215 | scpi->receive = scpi_tcp_receive; | |
216 | scpi->read = scpi_tcp_read; | |
217 | scpi->close = scpi_tcp_close; | |
218 | scpi->free = scpi_tcp_free; | |
219 | scpi->priv = tcp; | |
220 | ||
221 | return scpi; | |
222 | } |