From 2642e66fde569beca8823ad823db27daef860f5c Mon Sep 17 00:00:00 2001
From: COLIN Cyril <c16011455@L-662050OPEN-24.salsa.univ-amu.fr>
Date: Fri, 25 Oct 2019 11:37:27 +0200
Subject: [PATCH] lol

---
 partage/Makefile         | 36 ++++++++++++++++
 partage/configure-tun.sh |  3 ++
 partage/src/iftun.c      | 26 ++++++++++++
 partage/src/iftun.h      |  8 ++++
 partage/src/tunalloc.c   | 91 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 164 insertions(+)
 create mode 100644 partage/Makefile
 create mode 100755 partage/configure-tun.sh
 create mode 100644 partage/src/iftun.c
 create mode 100644 partage/src/iftun.h
 create mode 100644 partage/src/tunalloc.c

diff --git a/partage/Makefile b/partage/Makefile
new file mode 100644
index 0000000..c019893
--- /dev/null
+++ b/partage/Makefile
@@ -0,0 +1,36 @@
+CC := gcc -Wall -Wextra -Wpedantic -Werror -Iinclude -g
+
+
+build/iftun.a: build/iftun.o
+	ar rcs $@ $^
+
+build/iftun: build/iftun.a 
+
+
+
+# LIBS :=
+
+# LDFLAGS := $(LDFLAGS) $(shell pkg-config --libs $(LIBS))
+# CFLAGS := $(CFLAGS) $(shell pkg-config --cflags $(LIBS))
+
+BUILD_DIR ?= build
+
+OUT := $(notdir $(shell pwd))
+
+SRC := $(wildcard src/*.c)
+OBJS := $(patsubst src/%.c,$(BUILD_DIR)/%.o,$(SRC))
+DEPS := $(wildcard $(BUILD_DIR)/*.d)
+
+
+$(BUILD_DIR)/$(OUT): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $^
+
+
+-include $(DEPS)
+$(BUILD_DIR)/%.o: src/%.c
+	$(CC) $(CFLAGS) -MP -MD $< -c -o $@
+
+
+clean:
+	-rm -f $(BUILD_DIR)/*.o
+	-rm -f $(BUILD_DIR)/*.d
diff --git a/partage/configure-tun.sh b/partage/configure-tun.sh
new file mode 100755
index 0000000..427851c
--- /dev/null
+++ b/partage/configure-tun.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+ip l set tun0 up
+ip a a 172.16.2.1/28 dev tun0
diff --git a/partage/src/iftun.c b/partage/src/iftun.c
new file mode 100644
index 0000000..63105ba
--- /dev/null
+++ b/partage/src/iftun.c
@@ -0,0 +1,26 @@
+#include "iftun.h"
+
+
+int tun_alloc(char *dev) {
+	int fd = open("/dev/net/tun", O_RDWR);
+	if(fd < 0 ) {
+		perror("alloc tun");
+		exit(1);
+	}
+
+	struct ifreq ifr = {.ifr_flags = IFF_TUN};
+	ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
+
+	if (*dev) {
+		strncpy(ifr.ifr_name, dev, IFNAMSIZ);
+	}
+
+	int err = ioctl(fd, TUNSETIFF, (void *) &ifr);
+	if(err < 0 ){
+		close(fd);
+		return err;
+	}
+
+	strcpy(dev, ifr.ifr_name);
+	return fd;
+}
diff --git a/partage/src/iftun.h b/partage/src/iftun.h
new file mode 100644
index 0000000..7d3732b
--- /dev/null
+++ b/partage/src/iftun.h
@@ -0,0 +1,8 @@
+#ifndef IFTUN_H
+#define IFTUN_H
+
+
+int tun_alloc(char *dev);
+
+
+#endif
diff --git a/partage/src/tunalloc.c b/partage/src/tunalloc.c
new file mode 100644
index 0000000..b3a38e9
--- /dev/null
+++ b/partage/src/tunalloc.c
@@ -0,0 +1,91 @@
+#define _POSIX_C_SOURCE 200112L
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+
+#include <sys/types.h>
+#include <string.h>
+#include <netdb.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+
+
+int copy(int src, int dest) {
+	char buf[1024];
+	int n = 0;
+
+	while (1) {
+		n = read(src, buf, 1024);
+		write(dest, buf, n);
+	}
+}
+
+
+void ext_out() {
+	struct addrinfo hints = {
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_DGRAM,
+		.ai_flags = AI_PASSIVE,
+		.ai_protocol = 0,
+		.ai_canonname = NULL,
+		.ai_addr = NULL,
+		.ai_next = NULL,
+	};
+
+	struct addrinfo *results;
+	int s = getaddrinfo(NULL, "123", &hints, &results);
+	if (s != 0) {
+		fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
+		exit(1);
+	}
+
+	struct addrinfo *rp;
+	int sfd;
+	for (rp = results; rp != NULL; rp = rp->ai_next) {
+		sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+		if (sfd == -1)
+			continue;
+		if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == 0)
+			break;
+		close(sfd);
+	}
+
+	if (rp == NULL) {
+		fprintf(stderr, "Could not bind\n");
+		exit(EXIT_FAILURE);
+	}
+	freeaddrinfo(results);
+
+
+	struct sockaddr_storage peer_addr;
+	socklen_t peer_addr_len;
+	char buf[1024];
+	while (1) {
+		peer_addr_len = sizeof (struct sockaddr_storage);
+		ssize_t n = recvfrom(sfd, buf, sizeof buf, 0,
+			(struct sockaddr *) &peer_addr, &peer_addr_len);
+		if (n == -1) {
+			perror("recvfrom: ");
+			exit(1);
+		}
+		write(1, buf, n);
+	}
+}
+
+
+int main(int argc, char *argv[argc]){
+	int tun = tun_alloc(argv[1]);
+	/* printf("Configure %s puis appuie sur un touche…\n", argv[1]); */
+	/* getchar(); */
+	system("./configure-tun.sh");
+	/* copy(tun, 1); */
+	/* ext_out(); */
+	return 0;
+}