/**
* @file vpn/gnunet-daemon-vpn.c
- * @brief
+ * @brief the helper for various vpn-daemons. Opens a virtual network-interface,
+ * sends data received on the if to stdout, sends data received on stdin to the
+ * interface
* @author Philipp Tölke
*/
#include <platform.h>
#include "gnunet-vpn-helper-p.h"
#ifndef _LINUX_IN6_H
-// This is in linux/include/net/ipv6.h.
#define MAX_SIZE (65535 - sizeof(struct GNUNET_MessageHeader))
-struct in6_ifreq {
- struct in6_addr ifr6_addr;
- uint32_t ifr6_prefixlen;
- unsigned int ifr6_ifindex;
+// This is in linux/include/net/ipv6.h.
+struct in6_ifreq
+{
+ struct in6_addr ifr6_addr;
+ uint32_t ifr6_prefixlen;
+ unsigned int ifr6_ifindex;
};
#endif
-int running = 1;
+static int running = 1;
-void term(int sig) {
- fprintf(stderr, "Got SIGTERM...\n");
- if (sig == SIGTERM)
- running = 0;
+static void
+term (int sig)
+{
+ fprintf (stderr, "Got SIGTERM...\n");
+ if (sig == SIGTERM)
+ running = 0;
}
-static void set_address6(char* dev, char* address, unsigned long prefix_len) { /* {{{ */
- int fd = socket(AF_INET6, SOCK_DGRAM, 0);
-
- if (fd < 0)
- {
- fprintf(stderr, "error creating socket: %m\n");
- exit(1);
- }
-
- struct ifreq ifr;
- struct in6_ifreq ifr6;
-
- struct sockaddr_in6 sa6;
- memset(&sa6, 0, sizeof(struct sockaddr_in6));
-
- sa6.sin6_family = AF_INET6;
-
- int r = inet_pton(AF_INET6, address, sa6.sin6_addr.s6_addr);
- if (r < 0)
- {
- fprintf(stderr, "error at inet_pton: %m\n");
- exit(1);
- }
-
- memcpy((char *) &ifr6.ifr6_addr, (char *) &sa6.sin6_addr, sizeof(struct in6_addr));
-
- strncpy(ifr.ifr_name, dev, IFNAMSIZ);
-
- if (ioctl(fd, SIOGIFINDEX, &ifr) < 0) {
- perror("SIOGIFINDEX");
- }
+/**
+ * @brief Sets the IPv6-Address given in address on the interface dev
+ *
+ * @param dev the interface to configure
+ * @param address the IPv6-Address
+ * @param prefix_len the length of the network-prefix
+ */
+static void
+set_address6 (char *dev, char *address, unsigned long prefix_len)
+{ /* {{{ */
+ int fd = socket (AF_INET6, SOCK_DGRAM, 0);
- ifr6.ifr6_ifindex = ifr.ifr_ifindex;
- ifr6.ifr6_prefixlen = prefix_len;
+ if (fd < 0)
+ {
+ fprintf (stderr, "error creating socket: %m\n");
+ exit (1);
+ }
- if (ioctl(fd, SIOCSIFADDR, &ifr6) < 0) {
- perror("SIOCSIFADDR");
- }
+ struct ifreq ifr;
+ struct in6_ifreq ifr6;
- (void)ioctl(fd, SIOCGIFFLAGS, &ifr);
- ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
- (void)ioctl(fd, SIOCSIFFLAGS, &ifr);
- close(fd);
-} /* }}} */
-
-static void set_address4(char* dev, char* address, char* mask) { /* {{{ */
- int fd=0;
- struct sockaddr_in* addr;
- struct ifreq ifr;
-
- memset(&ifr, 0, sizeof(struct ifreq));
- addr = (struct sockaddr_in *)&(ifr.ifr_addr);
- memset(addr, 0, sizeof(struct sockaddr_in));
- addr->sin_family = AF_INET;
- addr->sin_addr.s_addr = inet_addr(address);
-
- int r = inet_pton(AF_INET, address, &addr->sin_addr.s_addr);
- if (r < 0)
- {
- fprintf(stderr, "error at inet_pton: %m\n");
- exit(1);
- }
-
- fd = socket(PF_INET, SOCK_DGRAM, 0);
- if(fd < 0) {
- perror("socket()");
- return;
- }
+ struct sockaddr_in6 sa6;
+ memset (&sa6, 0, sizeof (struct sockaddr_in6));
- strncpy(ifr.ifr_name, dev, IFNAMSIZ);
+ sa6.sin6_family = AF_INET6;
- if(ioctl(fd, SIOCSIFADDR, &ifr) != 0 ) {
- perror("SIOCSIFADDR");
- close(fd);
- return;
- }
-
- addr = (struct sockaddr_in*)&(ifr.ifr_netmask);
- r = inet_pton(AF_INET, mask, &addr->sin_addr.s_addr);
- if (r < 0)
- {
- fprintf(stderr, "error at inet_pton: %m\n");
- exit(1);
- }
-
- if(ioctl(fd, SIOCSIFNETMASK, &ifr) != 0 ) {
- perror("SIOCSIFNETMASK");
- close(fd);
- return;
- }
+ int r = inet_pton (AF_INET6, address, sa6.sin6_addr.s6_addr);
+ if (r < 0)
+ {
+ fprintf (stderr, "error at inet_pton: %m\n");
+ exit (1);
+ }
- (void)ioctl(fd, SIOCGIFFLAGS, &ifr);
- ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
- (void)ioctl(fd, SIOCSIFFLAGS, &ifr);
- close(fd);
-} /* }}} */
+ memcpy ((char *) &ifr6.ifr6_addr, (char *) &sa6.sin6_addr,
+ sizeof (struct in6_addr));
-void setnonblocking(int fd) {/*{{{*/
- int opts;
+ strncpy (ifr.ifr_name, dev, IFNAMSIZ);
- opts = fcntl(fd,F_GETFL);
- if (opts < 0) {
- perror("fcntl(F_GETFL)");
- }
- opts = (opts | O_NONBLOCK);
- if (fcntl(fd,F_SETFL,opts) < 0) {
- perror("fcntl(F_SETFL)");
- }
- return;
-}/*}}}*/
+ if (ioctl (fd, SIOGIFINDEX, &ifr) < 0)
+ {
+ perror ("SIOGIFINDEX");
+ }
-int main(int argc, char** argv) {
- unsigned char buf[MAX_SIZE];
+ ifr6.ifr6_ifindex = ifr.ifr_ifindex;
+ ifr6.ifr6_prefixlen = prefix_len;
- char dev[IFNAMSIZ];
- memset(dev, 0, IFNAMSIZ);
+ if (ioctl (fd, SIOCSIFADDR, &ifr6) < 0)
+ {
+ perror ("SIOCSIFADDR");
+ }
- signal(SIGTERM, &term);
+ (void) ioctl (fd, SIOCGIFFLAGS, &ifr);
+ ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
+ (void) ioctl (fd, SIOCSIFFLAGS, &ifr);
+ close (fd);
+} /* }}} */
- int fd_tun = init_tun(dev);
+static void
+/**
+ * @brief Sets the IPv4-Address given in address on the interface dev
+ *
+ * @param dev the interface to configure
+ * @param address the IPv4-Address
+ * @param mask the netmask
+ */
+set_address4 (char *dev, char *address, char *mask)
+{ /* {{{ */
+ int fd = 0;
+ struct sockaddr_in *addr;
+ struct ifreq ifr;
+
+ memset (&ifr, 0, sizeof (struct ifreq));
+ addr = (struct sockaddr_in *) &(ifr.ifr_addr);
+ memset (addr, 0, sizeof (struct sockaddr_in));
+ addr->sin_family = AF_INET;
+ addr->sin_addr.s_addr = inet_addr (address);
+
+ int r = inet_pton (AF_INET, address, &addr->sin_addr.s_addr);
+ if (r < 0)
+ {
+ fprintf (stderr, "error at inet_pton: %m\n");
+ exit (1);
+ }
+
+ fd = socket (PF_INET, SOCK_DGRAM, 0);
+ if (fd < 0)
+ {
+ perror ("socket()");
+ return;
+ }
+
+ strncpy (ifr.ifr_name, dev, IFNAMSIZ);
+
+ if (ioctl (fd, SIOCSIFADDR, &ifr) != 0)
+ {
+ perror ("SIOCSIFADDR");
+ close (fd);
+ return;
+ }
+
+ addr = (struct sockaddr_in *) &(ifr.ifr_netmask);
+ r = inet_pton (AF_INET, mask, &addr->sin_addr.s_addr);
+ if (r < 0)
+ {
+ fprintf (stderr, "error at inet_pton: %m\n");
+ exit (1);
+ }
+
+ if (ioctl (fd, SIOCSIFNETMASK, &ifr) != 0)
+ {
+ perror ("SIOCSIFNETMASK");
+ close (fd);
+ return;
+ }
+
+ (void) ioctl (fd, SIOCGIFFLAGS, &ifr);
+ ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
+ (void) ioctl (fd, SIOCSIFFLAGS, &ifr);
+ close (fd);
+} /* }}} */
- if (fd_tun < 0) {
- fprintf(stderr, "Could not initialize tun-interface: %s\n", strerror(errno));
- exit(1);
- }
+/**
+ * @brief sets the socket to nonblocking
+ *
+ * @param fd the socket
+ */
+static void
+setnonblocking (int fd)
+{ /*{{{ */
+ int opts;
+
+ opts = fcntl (fd, F_GETFL);
+ if (opts < 0)
+ {
+ perror ("fcntl(F_GETFL)");
+ }
+ opts = (opts | O_NONBLOCK);
+ if (fcntl (fd, F_SETFL, opts) < 0)
+ {
+ perror ("fcntl(F_SETFL)");
+ }
+ return;
+} /*}}} */
+
+int
+main (int argc, char **argv)
+{
+ unsigned char buf[MAX_SIZE];
+
+ char dev[IFNAMSIZ];
+ memset (dev, 0, IFNAMSIZ);
+
+ signal (SIGTERM, &term);
+
+ int fd_tun = init_tun (dev);
+
+ if (fd_tun < 0)
+ {
+ fprintf (stderr, "Could not initialize tun-interface: %s\n",
+ strerror (errno));
+ exit (1);
+ }
+
+ {
+ // TODO: get this out of argv
+ char address[] = "1234::1";
+ unsigned long prefix_len = 16;
+
+ set_address6 (dev, address, prefix_len);
+ }
+
+ {
+ char address[] = "10.10.10.1";
+ char mask[] = "255.255.255.252";
+
+ set_address4 (dev, address, mask);
+ }
+
+ uid_t uid = getuid ();
+ if (setresuid (uid, uid, uid) != 0)
+ fprintf (stderr, "Failed to setresuid: %s\n", strerror (errno));
+
+ setnonblocking (0);
+ setnonblocking (1);
+ setnonblocking (fd_tun);
+
+ fd_set fds_w;
+ fd_set fds_r;
+
+ int rea = 1;
+ int wri = 1;
+
+ int write_fd_possible = 0;
+ int write_stdout_possible = 0;
+outer:
+ while ((rea == 1 || wri == 1) && running == 1)
+ {
+ FD_ZERO (&fds_w);
+ FD_ZERO (&fds_r);
+ if (rea)
{
- // TODO: get this out of argv
- char address[] = "1234::1";
- unsigned long prefix_len = 16;
-
- set_address6(dev, address, prefix_len);
+ FD_SET (fd_tun, &fds_r);
+ if (!write_stdout_possible)
+ FD_SET (1, &fds_w);
}
+ if (wri)
{
- char address[] = "10.10.10.1";
- char mask[] = "255.255.255.252";
-
- set_address4(dev, address, mask);
+ FD_SET (0, &fds_r);
+ if (!write_fd_possible)
+ FD_SET (fd_tun, &fds_w);
}
- uid_t uid = getuid ();
- if (setresuid (uid, uid, uid) != 0 )
- fprintf (stderr, "Failed to setresuid: %s\n", strerror(errno));
-
- setnonblocking(0);
- setnonblocking(1);
- setnonblocking(fd_tun);
+ int r = select (fd_tun + 1, &fds_r, &fds_w, (fd_set *) 0, 0);
- fd_set fds_w;
- fd_set fds_r;
-
- int rea = 1;
- int wri = 1;
-
- int write_fd_possible = 0;
- int write_stdout_possible = 0;
-outer:
- while((rea == 1 || wri == 1) && running == 1) {
- FD_ZERO(&fds_w);
- FD_ZERO(&fds_r);
-
- if (rea) {
- FD_SET(fd_tun, &fds_r);
- if (!write_stdout_possible)
- FD_SET(1, &fds_w);
+ if (r > 0)
+ {
+ if (FD_ISSET (fd_tun, &fds_w))
+ write_fd_possible = 1;
+ if (FD_ISSET (1, &fds_w))
+ write_stdout_possible = 1;
+
+ if (FD_ISSET (0, &fds_r) && write_fd_possible)
+ {
+ write_fd_possible = 0;
+ struct suid_packet *pkt = (struct suid_packet *) buf;
+ r = read (0, buf, sizeof (struct GNUNET_MessageHeader));
+ if (r <= 0)
+ {
+ fprintf (stderr, "read-error: %s\n", strerror (errno));
+ shutdown (fd_tun, SHUT_WR);
+ shutdown (0, SHUT_RD);
+ wri = 0;
+ goto outer;
}
-
- if (wri) {
- FD_SET(0, &fds_r);
- if (!write_fd_possible)
- FD_SET(fd_tun, &fds_w);
+ if (pkt->hdr.type != ntohs (GNUNET_MESSAGE_TYPE_VPN_HELPER))
+ abort ();
+ while (r < ntohs (pkt->hdr.size))
+ {
+ int t = read (0, buf + r, ntohs (pkt->hdr.size) - r);
+ if (r < 0)
+ {
+ fprintf (stderr, "read-error: %s\n", strerror (errno));
+ shutdown (fd_tun, SHUT_WR);
+ shutdown (0, SHUT_RD);
+ wri = 0;
+ goto outer;
+ }
+ r += t;
}
-
- int r = select(fd_tun+1, &fds_r, &fds_w, (fd_set*)0, 0);
-
- if(r > 0) {
- if (FD_ISSET(fd_tun, &fds_w)) write_fd_possible = 1;
- if (FD_ISSET(1, &fds_w)) write_stdout_possible = 1;
-
- if (FD_ISSET(0, &fds_r) && write_fd_possible) {
- write_fd_possible = 0;
- struct suid_packet *pkt = (struct suid_packet*) buf;
- r = read(0, buf, sizeof(struct GNUNET_MessageHeader));
- if (r <= 0) {
- fprintf(stderr, "read-error: %s\n", strerror (errno));
- shutdown(fd_tun, SHUT_WR);
- shutdown(0, SHUT_RD);
- wri=0;
- goto outer;
- }
- if(pkt->hdr.type != ntohs(GNUNET_MESSAGE_TYPE_VPN_HELPER)) abort();
- while (r < ntohs(pkt->hdr.size)) {
- int t = read(0, buf + r, ntohs(pkt->hdr.size) - r);
- if (r < 0) {
- fprintf(stderr, "read-error: %s\n", strerror (errno));
- shutdown(fd_tun, SHUT_WR);
- shutdown(0, SHUT_RD);
- wri=0;
- goto outer;
- }
- r += t;
- }
- r = 0;
- while (r < ntohs(pkt->hdr.size) - sizeof(struct GNUNET_MessageHeader)) {
- int t = write(fd_tun, pkt->data, ntohs(pkt->hdr.size) - sizeof(struct GNUNET_MessageHeader) - r);
- if (t < 0) {
- fprintf(stderr, "write-error 3: %s\n", strerror (errno));
- shutdown(fd_tun, SHUT_WR);
- shutdown(0, SHUT_RD);
- wri = 0;
- goto outer;
- }
- r += t;
- }
- } else if (write_stdout_possible && FD_ISSET(fd_tun, &fds_r)) {
- write_stdout_possible = 0;
- r = read(fd_tun, buf, MAX_SIZE);
- if (r <= 0) {
- fprintf(stderr, "read-error: %s\n", strerror (errno));
- shutdown(fd_tun, SHUT_RD);
- shutdown(1, SHUT_WR);
- rea = 0;
- goto outer;
- }
- struct GNUNET_MessageHeader hdr = { .size = htons(r + sizeof(struct GNUNET_MessageHeader)), .type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER) };
- r = 0;
- while(r < sizeof(struct GNUNET_MessageHeader)) {
- int t = write(1, &hdr, sizeof(struct GNUNET_MessageHeader) - r);
- if (t < 0) {
- fprintf(stderr, "write-error 2: %s\n", strerror (errno));
- shutdown(fd_tun, SHUT_RD);
- shutdown(1, SHUT_WR);
- rea = 0;
- goto outer;
- }
- r += t;
- }
- while(r < ntohs(hdr.size)) {
- int t = write(1, buf, ntohs(hdr.size) - r);
- if (t < 0) {
- fprintf(stderr, "write-error 1: %s, written %d/%d\n", strerror(errno), r, ntohs(hdr.size));
- shutdown(fd_tun, SHUT_RD);
- shutdown(1, SHUT_WR);
- rea = 0;
- goto outer;
- }
- r += t;
- }
- }
+ r = 0;
+ while (r <
+ ntohs (pkt->hdr.size) -
+ sizeof (struct GNUNET_MessageHeader))
+ {
+ int t = write (fd_tun, pkt->data,
+ ntohs (pkt->hdr.size) -
+ sizeof (struct GNUNET_MessageHeader) - r);
+ if (t < 0)
+ {
+ fprintf (stderr, "write-error 3: %s\n",
+ strerror (errno));
+ shutdown (fd_tun, SHUT_WR);
+ shutdown (0, SHUT_RD);
+ wri = 0;
+ goto outer;
+ }
+ r += t;
+ }
+ }
+ else if (write_stdout_possible && FD_ISSET (fd_tun, &fds_r))
+ {
+ write_stdout_possible = 0;
+ r = read (fd_tun, buf, MAX_SIZE);
+ if (r <= 0)
+ {
+ fprintf (stderr, "read-error: %s\n", strerror (errno));
+ shutdown (fd_tun, SHUT_RD);
+ shutdown (1, SHUT_WR);
+ rea = 0;
+ goto outer;
+ }
+ struct GNUNET_MessageHeader hdr = {.size =
+ htons (r + sizeof (struct GNUNET_MessageHeader)),.type =
+ htons (GNUNET_MESSAGE_TYPE_VPN_HELPER)
+ };
+ r = 0;
+ while (r < sizeof (struct GNUNET_MessageHeader))
+ {
+ int t =
+ write (1, &hdr, sizeof (struct GNUNET_MessageHeader) - r);
+ if (t < 0)
+ {
+ fprintf (stderr, "write-error 2: %s\n",
+ strerror (errno));
+ shutdown (fd_tun, SHUT_RD);
+ shutdown (1, SHUT_WR);
+ rea = 0;
+ goto outer;
+ }
+ r += t;
+ }
+ while (r < ntohs (hdr.size))
+ {
+ int t = write (1, buf, ntohs (hdr.size) - r);
+ if (t < 0)
+ {
+ fprintf (stderr, "write-error 1: %s, written %d/%d\n",
+ strerror (errno), r, ntohs (hdr.size));
+ shutdown (fd_tun, SHUT_RD);
+ shutdown (1, SHUT_WR);
+ rea = 0;
+ goto outer;
+ }
+ r += t;
}
+ }
}
+ }
- close(fd_tun);
+ close (fd_tun);
- return 0;
+ return 0;
}
projects / oweals / gnunet.git / commitdiff