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separated linux-specific code to allow easier portability fixes.

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This commit is contained in:
Nikos Mavrogiannopoulos
2014-02-01 09:57:18 +01:00
parent 16f731bd2e
commit 97c2a4428f
1 changed files with 131 additions and 98 deletions
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229
src/tun.c
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@@ -39,22 +39,98 @@
# include <net/if_tun.h>
#endif
#ifdef __linux__
# include <linux/types.h>
struct in6_ifreq {
struct in6_addr ifr6_addr;
__u32 ifr6_prefixlen;
unsigned int ifr6_ifindex;
};
#endif
#include <netdb.h>
#include <vpn.h>
#include <tun.h>
#include <main.h>
#include <ccan/list/list.h>
static int set_network_info( main_server_st* s, struct proc_st* proc)
#ifdef __linux__
#include <linux/types.h>
struct in6_ifreq {
struct in6_addr ifr6_addr;
__u32 ifr6_prefixlen;
unsigned int ifr6_ifindex;
};
static
int set_ipv6_addr(main_server_st * s, struct proc_st *proc)
{
int fd, e, ret;
struct in6_ifreq ifr6;
struct ifreq ifr;
unsigned idx;
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (fd == -1) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error socket(AF_INET6): %s\n",
proc->tun_lease.name, strerror(e));
return -1;
}
memset(&ifr, 0, sizeof(ifr));
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", proc->tun_lease.name);
ret = ioctl(fd, SIOGIFINDEX, &ifr);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error in SIOGIFINDEX: %s\n",
proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
idx = ifr.ifr_ifindex;
memset(&ifr6, 0, sizeof(ifr6));
memcpy(&ifr6.ifr6_addr, SA_IN6_P(&proc->ipv6->lip),
SA_IN_SIZE(proc->ipv6->lip_len));
ifr6.ifr6_ifindex = idx;
ifr6.ifr6_prefixlen = 127;
ret = ioctl(fd, SIOCSIFADDR, &ifr6);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error setting IPv6: %s\n",
proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_addr.sa_family = AF_INET6;
ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", proc->tun_lease.name);
ret = ioctl(fd, SIOCSIFFLAGS, &ifr);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR,
"%s: Could not bring up IPv6 interface: %s\n",
proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
ret = 0;
cleanup:
close(fd);
return ret;
}
#else
#warn "No IPv6 support on this platform"
static int set_ipv6_addr(main_server_st * s, struct proc_st *proc)
{
return -1;
}
#endif
static int set_network_info(main_server_st * s, struct proc_st *proc)
{
int fd = -1, ret, e;
struct ifreq ifr;
@@ -73,7 +149,8 @@ static int set_network_info( main_server_st* s, struct proc_st* proc)
ret = ioctl(fd, SIOCSIFADDR, &ifr);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error setting IPv4: %s\n", proc->tun_lease.name, strerror(e));
mslog(s, NULL, LOG_ERR, "%s: Error setting IPv4: %s\n",
proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
@@ -87,7 +164,9 @@ static int set_network_info( main_server_st* s, struct proc_st* proc)
ret = ioctl(fd, SIOCSIFDSTADDR, &ifr);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error setting DST IPv4: %s\n", proc->tun_lease.name, strerror(e));
mslog(s, NULL, LOG_ERR,
"%s: Error setting DST IPv4: %s\n",
proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
@@ -100,7 +179,9 @@ static int set_network_info( main_server_st* s, struct proc_st* proc)
ret = ioctl(fd, SIOCSIFFLAGS, &ifr);
if (ret != 0) {
mslog(s, NULL, LOG_ERR, "%s: Could not bring up IPv4 interface.\n", proc->tun_lease.name);
mslog(s, NULL, LOG_ERR,
"%s: Could not bring up IPv4 interface.\n",
proc->tun_lease.name);
ret = -1;
goto cleanup;
}
@@ -110,75 +191,23 @@ static int set_network_info( main_server_st* s, struct proc_st* proc)
}
if (proc->ipv6 && proc->ipv6->lip_len > 0 && proc->ipv6->rip_len > 0) {
#ifdef __linux__
struct in6_ifreq ifr6;
unsigned idx;
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (fd == -1) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error socket(AF_INET6): %s\n", proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
ret = set_ipv6_addr(s, proc);
if (ret < 0) {
remove_ip_lease(s, proc->ipv6);
proc->ipv6 = NULL;
}
memset(&ifr, 0, sizeof(ifr));
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", proc->tun_lease.name);
ret = ioctl(fd, SIOGIFINDEX, &ifr);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error in SIOGIFINDEX: %s\n", proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
idx = ifr.ifr_ifindex;
memset(&ifr6, 0, sizeof(ifr6));
memcpy(&ifr6.ifr6_addr, SA_IN6_P(&proc->ipv6->lip), SA_IN_SIZE(proc->ipv6->lip_len));
ifr6.ifr6_ifindex = idx;
ifr6.ifr6_prefixlen = 127;
ret = ioctl(fd, SIOCSIFADDR, &ifr6);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Error setting IPv6: %s\n", proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_addr.sa_family = AF_INET6;
ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", proc->tun_lease.name);
ret = ioctl(fd, SIOCSIFFLAGS, &ifr);
if (ret != 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: Could not bring up IPv6 interface: %s\n", proc->tun_lease.name, strerror(e));
ret = -1;
goto cleanup;
}
close(fd);
fd = -1;
#else
remove_ip_lease(s, proc->ipv6);
proc->ipv6 = NULL;
# warn "No IPv6 support on this platform"
#endif
}
if (proc->ipv6 == 0 && proc->ipv4 == 0) {
mslog(s, NULL, LOG_ERR, "%s: Could not set any IP.\n", proc->tun_lease.name);
mslog(s, NULL, LOG_ERR, "%s: Could not set any IP.\n",
proc->tun_lease.name);
ret = -1;
goto cleanup;
}
ret = 0;
cleanup:
cleanup:
if (fd != -1)
close(fd);
return ret;
@@ -186,49 +215,53 @@ cleanup:
#include <ccan/hash/hash.h>
int open_tun(main_server_st* s, struct proc_st* proc)
int open_tun(main_server_st * s, struct proc_st *proc)
{
int tunfd, ret, e;
struct ifreq ifr;
unsigned int t;
ret = get_ip_leases(s, proc);
if (ret < 0)
return ret;
snprintf(proc->tun_lease.name, sizeof(proc->tun_lease.name), "%s%%d", s->config->network.name);
snprintf(proc->tun_lease.name, sizeof(proc->tun_lease.name), "%s%%d",
s->config->network.name);
/* No need to free the lease after this point.
*/
/* Obtain a free tun device */
#ifdef __linux__
tunfd = open("/dev/net/tun", O_RDWR);
if (tunfd < 0) {
int e = errno;
mslog(s, NULL, LOG_ERR, "Can't open /dev/net/tun: %s\n",
strerror(e));
strerror(e));
return -1;
}
set_cloexec_flag (tunfd, 1);
set_cloexec_flag(tunfd, 1);
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
memcpy(ifr.ifr_name, proc->tun_lease.name, IFNAMSIZ);
memcpy(ifr.ifr_name, proc->tun_lease.name, IFNAMSIZ);
if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0) {
if (ioctl(tunfd, TUNSETIFF, (void *)&ifr) < 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: TUNSETIFF: %s\n", proc->tun_lease.name, strerror(e));
mslog(s, NULL, LOG_ERR, "%s: TUNSETIFF: %s\n",
proc->tun_lease.name, strerror(e));
goto fail;
}
memcpy(proc->tun_lease.name, ifr.ifr_name, IFNAMSIZ);
mslog(s, proc, LOG_INFO, "assigning tun device %s\n", proc->tun_lease.name);
mslog(s, proc, LOG_INFO, "assigning tun device %s\n",
proc->tun_lease.name);
/* we no longer use persistent tun */
if (ioctl(tunfd, TUNSETPERSIST, (void *)0) < 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: TUNSETPERSIST: %s\n", proc->tun_lease.name, strerror(e));
mslog(s, NULL, LOG_ERR, "%s: TUNSETPERSIST: %s\n",
proc->tun_lease.name, strerror(e));
goto fail;
}
@@ -238,47 +271,47 @@ int open_tun(main_server_st* s, struct proc_st* proc)
if (ret < 0) {
e = errno;
mslog(s, NULL, LOG_INFO, "%s: TUNSETOWNER: %s\n",
proc->tun_lease.name, strerror(e));
proc->tun_lease.name, strerror(e));
goto fail;
}
}
# ifdef TUNSETGROUP
#ifdef TUNSETGROUP
if (s->config->gid != -1) {
t = s->config->uid;
ret = ioctl(tunfd, TUNSETGROUP, t);
if (ret < 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: TUNSETGROUP: %s\n",
proc->tun_lease.name, strerror(e));
proc->tun_lease.name, strerror(e));
goto fail;
}
}
# endif
#else /* freebsd */
#endif
#else /* freebsd */
tunfd = open("/dev/tun", O_RDWR);
if (tunfd < 0) {
int e = errno;
mslog(s, NULL, LOG_ERR, "Can't open /dev/tun: %s\n",
strerror(e));
strerror(e));
return -1;
}
/* find device name */
{
struct stat st;
ret = fstat(tunfd, &st);
if (ret < 0) {
e = errno;
mslog(s, NULL, LOG_ERR, "%s: stat: %s\n", strerror(e));
goto fail;
}
snprintf(proc->tun_lease.name, sizeof(proc->tun_lease.name), "%s", devname(st.st_rdev, S_IFCHR));
snprintf(proc->tun_lease.name, sizeof(proc->tun_lease.name),
"%s", devname(st.st_rdev, S_IFCHR));
}
set_cloexec_flag (tunfd, 1);
set_cloexec_flag(tunfd, 1);
#endif
/* set IP/mask */
@@ -290,7 +323,7 @@ int open_tun(main_server_st* s, struct proc_st* proc)
proc->tun_lease.fd = tunfd;
return 0;
fail:
fail:
close(tunfd);
return -1;
}