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)
24 fd = open(path, O_RDONLY);
26 printf("%s: Failed to open file %s: %m\n", __func__, path);
30 ret = read(fd, buf, sizeof(buf) - 1);
32 printf("%s: Failed read temperature from file %s: %m\n",
56 static char *addrstr(struct sockaddr_in *addr)
60 snprintf(str, sizeof(str), "%s:%d",
61 inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
62 str[sizeof(str) - 1] = '\0';
67 static int fetch_bmed_data(struct sockaddr_in *addr, struct data_entry *data)
73 fd = socket(AF_INET, SOCK_STREAM, 0);
75 printf("%s: Failed to create socket: %m\n", __func__);
79 ret = connect(fd, (struct sockaddr *)addr, sizeof(*addr));
81 printf("%s: Failed to connect at %s: %m\n", __func__, addrstr(addr));
86 * Send timestamp of the first entry we want. Data is
87 * generated every 60 seconds, so this should give us the last
90 ret = dprintf(fd, "%ld\n", time(NULL) - 60);
92 printf("%s: Failed to send timestamp to bmed at %s: %m\n",
93 __func__, addrstr(addr));
97 ret = read(fd, buf, sizeof(buf) - 1);
99 printf("%s: Failed read data from bmed at %s: %m\n",
100 __func__, addrstr(addr));
105 ret = sscanf(buf, "%ld:%lf:%lf:%lf:%lf",
112 printf("%s: Read only %d datapoints out of 5 from string: %s\n", __func__,
125 static int parse_ip_port(const char *str, struct sockaddr_in *addr)
132 s = strstr(str, ":");
134 if (len >= (long)sizeof(ip) || len < 0 || !s) {
135 printf("%s: Unable to parse ip:port from string %s, %ld\n",
140 strncpy(ip, str, len);
143 ret = inet_aton(ip, &addr->sin_addr);
145 printf("Invalid address: %s\n", ip);
150 addr->sin_port = htons(atoi(s));
152 printf("%s:Parsed %s from %s: \n", __func__, addrstr(addr), str);
154 addr->sin_family = AF_INET;
158 static int daemon_loop(const char *temp_path, struct sockaddr_in *bme_addr)
160 struct sockaddr_in addr_in;
161 struct data_entry data;
162 int listen_fd, fd, ret;
165 bzero(&addr_in, sizeof(addr_in));
167 listen_fd = socket(AF_INET, SOCK_STREAM, 0);
172 addr_in.sin_family = AF_INET;
173 addr_in.sin_port = htons(6000);
174 addr_in.sin_addr.s_addr = INADDR_ANY;
176 ret = bind(listen_fd, (struct sockaddr *)&addr_in, sizeof(addr_in));
178 printf("%s: Failed to bind to addr %s: %m\n",
179 __func__, addrstr(&addr_in));
183 ret = listen(listen_fd, 5);
185 printf("Failed to listen(): %m\n");
191 socklen_t peerlen = 0;
192 int onewire_ok, bme_ok;
195 fd = accept(listen_fd, (struct sockaddr *)&addr_in, &peerlen);
197 printf("%s: Error while accept(): %m\n", __func__);
201 ret = read_1wire_temp(temp_path, &temp);
204 printf("1wire data: %.2lf\n", temp);
207 ret = fetch_bmed_data(bme_addr, &data);
210 printf("bmed data: %ld %.4lf %.4lf %.4lf %.4lf\n",
211 data.time, data.temperature, data.humidity,
212 data.pressure, data.dew_point);
215 temp = data.temperature;
217 len = snprintf(buf, sizeof(buf), "%.1lf %.1lf %.1lf %.1lf\n\r",
218 min(temp, data.temperature),
223 for (i = 0; i < (int)sizeof(buf) && buf[i]; i++)
227 ret = write(fd, buf, len);
229 printf("%s: Failed to write to %s: %m\n", __func__, addrstr(&addr_in));
239 int main(int argc, char *argv[])
242 struct sockaddr_in addr;
246 printf("Usage: %s [1wire path] [bmed ip:addr]\n", argv[0]);
250 bzero(&addr, sizeof(addr));
251 ret = parse_ip_port(argv[2], &addr);
257 daemon_loop(path, &addr);