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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <arpa/inet.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <poll.h>
#include <sys/types.h>
#include <error.h>
#include <endian.h>
#include <inttypes.h>
#include <signal.h>
#include <netdb.h>
#define S0(x) (x ? x : "")
struct entry {
uint64_t time __attribute__((packed));
uint64_t value __attribute__((packed));
} __attribute__((packed));
int samomor = 0;
void handle_me (int s __attribute__((unused))) {
samomor++;
}
int main (int argc, char ** argv) {
if (argc < 1+1)
error_at_line(1, 0, __FILE__, __LINE__, "uporaba: %s db [port=35358] [bind=::] [src=]", S0(argv[0]));
struct sigaction act = {
.sa_handler = handle_me,
.sa_flags = SA_RESTART
};
if (sigaction(SIGINT, &act, NULL) == -1)
error_at_line(2, errno, __FILE__, __LINE__, "sigaction SIGINT");
if (sigaction(SIGTERM, &act, NULL) == -1)
error_at_line(3, errno, __FILE__, __LINE__, "sigaction SIGTERM");
#define DB argv[1]
int port = 35358;
if (argc >= 1+2)
port = atoi(argv[2]);
struct sockaddr_in6 bind_address = {
.sin6_family = AF_INET6,
.sin6_port = htons(port),
.sin6_addr = in6addr_any
};
if (argc >= 1+3)
switch (inet_pton(AF_INET6, argv[3], &bind_address.sin6_addr)) {
case 0:
error_at_line(4, 0, __FILE__, __LINE__, "!inet_pton(AF_INET6, argv[3], &bind_address.sin6_addr)");
break;
case -1:
error_at_line(5, errno, __FILE__, __LINE__, "inet_pton");
}
struct sockaddr_in6 src = {
.sin6_family = AF_INET6,
.sin6_port = htons(port),
.sin6_addr = in6addr_any
};
int whitelist_src = 0;
if (argc >= 1+4) {
whitelist_src++;
switch (inet_pton(AF_INET6, argv[4], &src.sin6_addr)) {
case 0:
error_at_line(6, 0, __FILE__, __LINE__, "!inet_pton(AF_INET6, argv[4], &src.sin6_addr)");
break;
case -1:
error_at_line(7, errno, __FILE__, __LINE__, "inet_pton");
}
}
int udp = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (udp == -1)
error_at_line(10, errno, __FILE__, __LINE__, "socket");
FILE * db = NULL;
int z = 1;
int r = 0;
if (setsockopt(udp, SOL_SOCKET, SO_BROADCAST, &z, sizeof z) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "setsockopt");
r = 11;
goto r;
}
if (bind(udp, (struct sockaddr *) &bind_address, sizeof bind_address)) {
error_at_line(0, errno, __FILE__, __LINE__, "bind");
r = 12;
goto r;
}
if (!(db = fopen(DB, "a"))) {
error_at_line(0, errno, __FILE__, __LINE__, "fopen");
r = 13;
goto r;
}
while (!samomor) {
struct pollfd pollfd = {
.fd = udp,
.events = POLLIN | POLLERR | POLLHUP | POLLNVAL
};
if (poll(&pollfd, 1, -1) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "poll");
r = 14;
goto r;
}
if ((pollfd.revents & POLLERR) || (pollfd.revents & POLLHUP) || (pollfd.revents & POLLNVAL)) {
error_at_line(0, 0, __FILE__, __LINE__, "POLLERR || POLLHUP || POLLNVAL");
r = 15;
goto r;
}
struct sockaddr_storage sender;
socklen_t sender_len = sizeof sender;
char buf[512];
ssize_t bytes = recvfrom(udp, buf, 256, MSG_DONTWAIT, (struct sockaddr *) &sender, &sender_len);
if (bytes == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "recvfrom");
r = 16;
goto r;
}
struct timespec current_time;
if (clock_gettime(CLOCK_REALTIME, ¤t_time) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "clock_gettime");
r = 17;
goto r;
}
uint64_t current_time_us = current_time.tv_sec*1000000+current_time.tv_nsec/1000;
unsigned long long int current_Wh = strtoull(buf, NULL, 10);
struct entry entry = {
.time = htobe64(current_time_us),
.value = htobe64(current_Wh)
};
char sender_host[512];
char sender_port[512];
int gni = getnameinfo((struct sockaddr *) &sender, sender_len, sender_host, 512, sender_port, 512, NI_DGRAM | NI_NUMERICHOST | NI_NUMERICSERV);
if (gni) {
error_at_line(0, 0, __FILE__, __LINE__, "getnameinfo: %s", gai_strerror(gni));
r = 19;
goto r;
}
time_t sedaj = time(NULL);
strcpy(buf, ctime(&sedaj));
buf[strlen(buf)-1] = '\0';
if (sender.ss_family != AF_INET6)
if (whitelist_src) {
fprintf(stderr, "[%s] %s:%s\tsender.ss_family != AF_INET6\n", buf, sender_host, sender_port);
continue;
}
if (whitelist_src && memcmp(&((struct sockaddr_in6 *) &sender)->sin6_addr, &src.sin6_addr, sizeof(src.sin6_addr))) {
fprintf(stderr, "[%s] %s:%s\tfailed src whitelist\n", buf, sender_host, sender_port);
continue;
}
fprintf(stderr, "[%s] %s:%s\t%llu Wh\n", buf, sender_host, sender_port, current_Wh);
if (fwrite(&entry, sizeof entry, 1, db) != 1) {
error_at_line(0, 0, __FILE__, __LINE__, "fwrite");
r = 18;
goto r;
}
fflush(db);
}
r:
if (close(udp) == -1)
error_at_line(19, errno, __FILE__, __LINE__, "close(udp)");
if (db != NULL)
if (fclose(db) == -1)
error_at_line(20, errno, __FILE__, __LINE__, "fclose(db)");
return r;
}
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