4 files changed, 97 insertions(+), 0 deletions(-)

A .gitignore
A Makefile
A config.def.h
A netpower.c

@@ 1,2 @@
+config.h
+netpower

@@ 1,13 @@
+CFLAGS := -Wall -Wpedantic
+
+netpower: netpower.c config.h
+	$(CC) $(CFLAGS) -o $@ $<
+
+config.h: config.def.h
+	cp $< $@
+
+install:
+	install -m 0755 netpower /usr/local/bin/
+
+clean:
+	rm -rf netpower

@@ 1,3 @@
+static const char ADDRESS[]  = "192.168.1.254";
+static const char PORT[]     = "80";
+static const char PASSWORD[] = "";

@@ 1,79 @@
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "config.h"
+
+int main(int argc, char *argv[])
+{
+	if (argc < 2) {
+		fprintf(stderr, "Usage: %s <n|f|c|q>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	char action = argv[1][0];
+
+	if (action != 'n' && action != 'f' && action != 'c' && action != 'q') {
+		fprintf(stderr, "Invalid action: %c\n", action);
+		exit(EXIT_FAILURE);
+	}
+
+	int sockfd;
+	struct addrinfo *result, *rp;
+	struct addrinfo hints = {
+		.ai_family = AF_INET,
+		.ai_socktype = SOCK_STREAM,
+		.ai_flags = 0,
+		.ai_protocol = 0,
+	};
+
+	int s = getaddrinfo(ADDRESS, PORT, &hints, &result);
+	if (s != 0) {
+		fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
+		exit(EXIT_FAILURE);
+	}
+
+	for (rp = result; rp != NULL; rp = rp->ai_next) {
+		sockfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+		if (sockfd == -1) {
+			continue;
+		}
+
+		if (connect(sockfd, rp->ai_addr, rp->ai_addrlen) != -1) {
+			break;
+		}
+
+		close(sockfd);
+	}
+
+	if (rp == NULL) {
+		fprintf(stderr, "Could not connect\n");
+		exit(EXIT_FAILURE);
+	}
+
+	freeaddrinfo(result);
+
+	char buf[16];
+	sprintf(buf, "%s%c\r", PASSWORD, action);
+
+	int buflen = strnlen(buf, 16);
+	if (write(sockfd, buf, buflen) != buflen) {
+		fprintf(stderr, "partial/failed write\n");
+		exit(EXIT_FAILURE);
+	}
+
+	memset(buf, 0, 16);
+	ssize_t nread = read(sockfd, buf, 16);
+	if (nread == -1) {
+		perror("read");
+		exit(EXIT_FAILURE);
+	}
+
+	printf("%s\n", buf);
+
+	exit(EXIT_SUCCESS);
+}