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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> | |
26 | #include <sys/socket.h> | |
27 | #include <netinet/in.h> | |
28 | #include <arpa/inet.h> | |
29 | #include <netdb.h> | |
30 | #include <errno.h> | |
31 | ||
32 | /* Message logging helpers with subsystem-specific prefix string. */ | |
33 | #define LOG_PREFIX "scpi_tcp: " | |
34 | #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args) | |
35 | #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args) | |
36 | #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args) | |
37 | #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args) | |
38 | #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args) | |
39 | ||
40 | struct scpi_tcp { | |
41 | char *address; | |
42 | char *port; | |
43 | int socket; | |
44 | }; | |
45 | ||
46 | SR_PRIV int scpi_tcp_open(void *priv) | |
47 | { | |
48 | struct scpi_tcp *tcp = priv; | |
49 | struct addrinfo hints; | |
50 | struct addrinfo *results, *res; | |
51 | int err; | |
52 | ||
53 | memset(&hints, 0, sizeof(hints)); | |
54 | hints.ai_family = AF_UNSPEC; | |
55 | hints.ai_socktype = SOCK_STREAM; | |
56 | hints.ai_protocol = IPPROTO_TCP; | |
57 | ||
58 | err = getaddrinfo(tcp->address, tcp->port, &hints, &results); | |
59 | ||
60 | if (err) { | |
61 | sr_err("Address lookup failed: %s:%d: %s", tcp->address, tcp->port, | |
62 | gai_strerror(err)); | |
63 | return SR_ERR; | |
64 | } | |
65 | ||
66 | for (res = results; res; res = res->ai_next) { | |
67 | if ((tcp->socket = socket(res->ai_family, res->ai_socktype, | |
68 | res->ai_protocol)) < 0) | |
69 | continue; | |
70 | if (connect(tcp->socket, res->ai_addr, res->ai_addrlen) != 0) { | |
71 | close(tcp->socket); | |
72 | tcp->socket = -1; | |
73 | continue; | |
74 | } | |
75 | break; | |
76 | } | |
77 | ||
78 | freeaddrinfo(results); | |
79 | ||
80 | if (tcp->socket < 0) { | |
81 | sr_err("Failed to connect to %s:%s: %s", tcp->address, tcp->port, | |
82 | strerror(errno)); | |
83 | return SR_ERR; | |
84 | } | |
85 | ||
86 | return SR_OK; | |
87 | } | |
88 | ||
89 | SR_PRIV int scpi_tcp_source_add(void *priv, int events, int timeout, | |
90 | sr_receive_data_callback_t cb, void *cb_data) | |
91 | { | |
92 | struct scpi_tcp *tcp = priv; | |
93 | ||
94 | return sr_source_add(tcp->socket, events, timeout, cb, cb_data); | |
95 | } | |
96 | ||
97 | SR_PRIV int scpi_tcp_source_remove(void *priv) | |
98 | { | |
99 | struct scpi_tcp *tcp = priv; | |
100 | ||
101 | return sr_source_remove(tcp->socket); | |
102 | } | |
103 | ||
104 | SR_PRIV int scpi_tcp_send(void *priv, const char *command) | |
105 | { | |
106 | struct scpi_tcp *tcp = priv; | |
107 | int len, out; | |
b8705e99 | 108 | char *terminated_command; |
08a35913 | 109 | |
b8705e99 ML |
110 | terminated_command = g_strdup_printf("%s\r\n", command); |
111 | len = strlen(terminated_command); | |
112 | out = send(tcp->socket, terminated_command, len, 0); | |
113 | g_free(terminated_command); | |
08a35913 ML |
114 | |
115 | if (out < 0) { | |
116 | sr_err("Send error: %s", strerror(errno)); | |
117 | return SR_ERR; | |
118 | } | |
119 | ||
120 | if (out < len) { | |
121 | sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out, | |
122 | len, command); | |
123 | } | |
124 | ||
125 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
126 | ||
127 | return SR_OK; | |
128 | } | |
129 | ||
130 | SR_PRIV int scpi_tcp_receive(void *priv, char **scpi_response) | |
131 | { | |
132 | struct scpi_tcp *tcp = priv; | |
133 | GString *response; | |
134 | char buf[256]; | |
135 | int len; | |
136 | ||
137 | response = g_string_sized_new(1024); | |
138 | ||
139 | len = recv(tcp->socket, buf, sizeof(buf), 0); | |
140 | ||
141 | if (len < 0) { | |
142 | sr_err("Receive error: %s", strerror(errno)); | |
143 | g_string_free(response, TRUE); | |
144 | return SR_ERR; | |
145 | } | |
146 | ||
b8705e99 | 147 | response = g_string_append_len(response, buf + 4, len - 4); |
08a35913 ML |
148 | |
149 | *scpi_response = response->str; | |
150 | ||
151 | sr_dbg("SCPI response received (length %d): '%.50s'", | |
152 | response->len, response->str); | |
153 | ||
154 | g_string_free(response, FALSE); | |
155 | ||
156 | return SR_OK; | |
157 | } | |
158 | ||
159 | SR_PRIV int scpi_tcp_read(void *priv, char *buf, int maxlen) | |
160 | { | |
161 | struct scpi_tcp *tcp = priv; | |
162 | int len; | |
163 | ||
164 | len = recv(tcp->socket, buf, maxlen, 0); | |
165 | ||
166 | if (len < 0) { | |
167 | sr_err("Receive error: %s", strerror(errno)); | |
168 | return SR_ERR; | |
169 | } | |
170 | ||
171 | return len; | |
172 | } | |
173 | ||
174 | SR_PRIV int scpi_tcp_close(void *priv) | |
175 | { | |
176 | struct scpi_tcp *tcp = priv; | |
177 | ||
178 | if (close(tcp->socket) < 0) | |
179 | return SR_ERR; | |
180 | ||
181 | return SR_OK; | |
182 | } | |
183 | ||
184 | SR_PRIV void scpi_tcp_free(void *priv) | |
185 | { | |
186 | struct scpi_tcp *tcp = priv; | |
187 | ||
188 | g_free(tcp->address); | |
189 | g_free(tcp->port); | |
190 | g_free(tcp); | |
191 | } | |
192 | ||
193 | SR_PRIV struct sr_scpi_dev_inst *scpi_tcp_dev_inst_new(const char *address, | |
194 | const char *port) | |
195 | { | |
196 | struct sr_scpi_dev_inst *scpi; | |
197 | struct scpi_tcp *tcp; | |
198 | ||
199 | scpi = g_malloc(sizeof(struct sr_scpi_dev_inst)); | |
200 | tcp = g_malloc0(sizeof(struct scpi_tcp)); | |
201 | ||
202 | tcp->address = g_strdup(address); | |
203 | tcp->port = g_strdup(port); | |
204 | tcp->socket = -1; | |
205 | ||
206 | scpi->open = scpi_tcp_open; | |
207 | scpi->source_add = scpi_tcp_source_add; | |
208 | scpi->source_remove = scpi_tcp_source_remove; | |
209 | scpi->send = scpi_tcp_send; | |
210 | scpi->receive = scpi_tcp_receive; | |
211 | scpi->read = scpi_tcp_read; | |
212 | scpi->close = scpi_tcp_close; | |
213 | scpi->free = scpi_tcp_free; | |
214 | scpi->priv = tcp; | |
215 | ||
216 | return scpi; | |
217 | } |