10 #include <sys/socket.h>
11 #include <netinet/in.h>
12 #include <arpa/inet.h>
13 #include <sys/ioctl.h>
15 #define min(a, b) ((a) < (b) ? (a) : (b))
16 #define max(a, b) ((a) > (b) ? (a) : (b))
18 static int read_1wire_temp(const char *path, double *temp)
26 fd = open(path, O_RDONLY);
28 printf("%s: Failed to open file %s: %m\n", __func__, path);
32 ret = read(fd, buf, sizeof(buf) - 1);
34 printf("%s: Failed read temperature from file %s: %m\n",
51 printf("Retrying 1wire read, try %d\n", retries);
67 static char *addrstr(struct sockaddr_in *addr)
71 snprintf(str, sizeof(str), "%s:%d",
72 inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
73 str[sizeof(str) - 1] = '\0';
78 static int fetch_bmed_data(struct sockaddr_in *addr, struct data_entry *data)
84 fd = socket(AF_INET, SOCK_STREAM, 0);
86 printf("%s: Failed to create socket: %m\n", __func__);
90 ret = connect(fd, (struct sockaddr *)addr, sizeof(*addr));
92 printf("%s: Failed to connect at %s: %m\n", __func__, addrstr(addr));
97 * Send timestamp of the first entry we want. Data is
98 * generated every 60 seconds, so this should give us the last
101 ret = dprintf(fd, "%ld\n", time(NULL) - 60);
103 printf("%s: Failed to send timestamp to bmed at %s: %m\n",
104 __func__, addrstr(addr));
108 ret = read(fd, buf, sizeof(buf) - 1);
110 printf("%s: Failed read data from bmed at %s: %m\n",
111 __func__, addrstr(addr));
116 ret = sscanf(buf, "%ld:%lf:%lf:%lf:%lf",
123 printf("%s: Read only %d datapoints out of 5 from string: %s\n", __func__,
136 static int parse_ip_port(const char *str, struct sockaddr_in *addr)
143 s = strstr(str, ":");
145 if (len >= (long)sizeof(ip) || len < 0 || !s) {
146 printf("%s: Unable to parse ip:port from string %s, %ld\n",
151 strncpy(ip, str, len);
154 ret = inet_aton(ip, &addr->sin_addr);
156 printf("Invalid address: %s\n", ip);
161 addr->sin_port = htons(atoi(s));
163 printf("%s:Parsed %s from %s: \n", __func__, addrstr(addr), str);
165 addr->sin_family = AF_INET;
169 static int daemon_loop(const char *temp_path, struct sockaddr_in *bme_addr)
171 struct sockaddr_in addr_in;
172 struct data_entry data;
173 int listen_fd, fd, ret;
176 bzero(&addr_in, sizeof(addr_in));
178 listen_fd = socket(AF_INET, SOCK_STREAM, 0);
183 addr_in.sin_family = AF_INET;
184 addr_in.sin_port = htons(6000);
185 addr_in.sin_addr.s_addr = INADDR_ANY;
187 ret = bind(listen_fd, (struct sockaddr *)&addr_in, sizeof(addr_in));
189 printf("%s: Failed to bind to addr %s: %m\n",
190 __func__, addrstr(&addr_in));
194 ret = listen(listen_fd, 5);
196 printf("Failed to listen(): %m\n");
202 socklen_t peerlen = 0;
203 int onewire_ok, bme_ok;
206 fd = accept(listen_fd, (struct sockaddr *)&addr_in, &peerlen);
208 printf("%s: Error while accept(): %m\n", __func__);
212 ret = read_1wire_temp(temp_path, &temp);
215 printf("1wire data: %.2lf\n", temp);
218 ret = fetch_bmed_data(bme_addr, &data);
221 printf("bmed data: %ld %.4lf %.4lf %.4lf %.4lf\n",
222 data.time, data.temperature, data.humidity,
223 data.pressure, data.dew_point);
226 temp = data.temperature;
228 len = snprintf(buf, sizeof(buf), "%.1lf %.1lf %.1lf %.1lf\n\r",
229 min(temp, data.temperature),
234 for (i = 0; i < (int)sizeof(buf) && buf[i]; i++)
238 ret = write(fd, buf, len);
240 printf("%s: Failed to write to %s: %m\n", __func__, addrstr(&addr_in));
250 int main(int argc, char *argv[])
253 struct sockaddr_in addr;
257 printf("Usage: %s [1wire path] [bmed ip:addr]\n", argv[0]);
261 bzero(&addr, sizeof(addr));
262 ret = parse_ip_port(argv[2], &addr);
268 daemon_loop(path, &addr);