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tap-vsockd: Use Linux coding style (mostly)

Browse Source 
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer 2016-09-02 12:52:35 +01:00
parent 6df7fae1a9
commit 1a289d04e5
5 changed files with 608 additions and 515 deletions
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36
alpine/packages/tap-vsockd/hvsock.c
View File

@ -4,23 +4,25 @@
int parseguid(const char *s, GUID *g)
{
int res;
int p0, p1, p2, p3, p4, p5, p6, p7;
int res;
int p0, p1, p2, p3, p4, p5, p6, p7;
res = sscanf(s, GUID_FMT,
&g->Data1, &g->Data2, &g->Data3,
&p0, &p1, &p2, &p3, &p4, &p5, &p6, &p7);
if (res != 11)
return 1;
g->Data4[0] = p0;
g->Data4[1] = p1;
g->Data4[2] = p2;
g->Data4[3] = p3;
g->Data4[4] = p4;
g->Data4[5] = p5;
g->Data4[6] = p6;
g->Data4[7] = p7;
return 0;
res = sscanf(s, GUID_FMT,
&g->Data1, &g->Data2, &g->Data3,
&p0, &p1, &p2, &p3, &p4, &p5, &p6, &p7);
if (res != 11)
return 1;
g->Data4[0] = p0;
g->Data4[1] = p1;
g->Data4[2] = p2;
g->Data4[3] = p3;
g->Data4[4] = p4;
g->Data4[5] = p5;
g->Data4[6] = p6;
g->Data4[7] = p7;
return 0;
}
DEFINE_GUID(HV_GUID_ZERO,
@ -28,7 +30,7 @@ DEFINE_GUID(HV_GUID_ZERO,
DEFINE_GUID(HV_GUID_BROADCAST,
0xFFFFFFFF, 0xFFFF, 0xFFFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF);
DEFINE_GUID(HV_GUID_WILDCARD,
0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
DEFINE_GUID(HV_GUID_CHILDREN,
0x90db8b89, 0x0d35, 0x4f79, 0x8c, 0xe9, 0x49, 0xea, 0x0a, 0xc8, 0xb7, 0xcd);

19
alpine/packages/tap-vsockd/hvsock.h
View File

@ -7,10 +7,10 @@
/* GUID handling */
typedef struct _GUID {
uint32_t Data1;
uint16_t Data2;
uint16_t Data3;
uint8_t Data4[8];
uint32_t Data1;
uint16_t Data2;
uint16_t Data3;
uint8_t Data4[8];
} GUID;
#define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
@ -33,12 +33,11 @@ extern int parseguid(const char *s, GUID *g);
#define AF_HYPERV 43
#define HV_PROTOCOL_RAW 1
typedef struct _SOCKADDR_HV
{
unsigned short Family;
unsigned short Reserved;
GUID VmId;
GUID ServiceId;
typedef struct _SOCKADDR_HV {
unsigned short Family;
unsigned short Reserved;
GUID VmId;
GUID ServiceId;
} SOCKADDR_HV;
extern const GUID HV_GUID_ZERO;

325
alpine/packages/tap-vsockd/protocol.c
View File

@ -10,162 +10,215 @@
#include "protocol.h"
/* Version 0 of the protocol used this */
char expected_hello_old[5] = { 'V', 'M', 'N', 'E', 'T' };
char expected_hello_old[5] = {'V', 'M', 'N', 'E', 'T'};
/* Version 1 and later of the protocol used this */
char expected_hello[5] = { 'V', 'M', 'N', '3', 'T' };
char expected_hello[5] = {'V', 'M', 'N', '3', 'T'};
int really_read(int fd, uint8_t *buffer, size_t total){
size_t remaining = total;
ssize_t n;
while (remaining > 0){
n = read(fd, buffer, remaining);
if (n == 0){
syslog(LOG_CRIT, "EOF reading from socket: closing\n");
goto err;
}
if (n < 0){
syslog(LOG_CRIT, "Failure reading from socket: closing: %s", strerror(errno));
goto err;
}
remaining -= (size_t)n;
buffer = buffer + n;
}
return 0;
err:
/* On error: stop reading from the socket and trigger a clean shutdown */
shutdown(fd, SHUT_RD);
return -1;
}
int really_write(int fd, uint8_t *buffer, size_t total){
int really_read(int fd, uint8_t *buffer, size_t total)
{
size_t remaining = total;
ssize_t n;
while (remaining > 0){
n = write(fd, buffer, remaining);
if (n == 0){
syslog(LOG_CRIT, "EOF writing to socket: closing");
goto err;
}
if (n < 0){
syslog(LOG_CRIT, "Failure writing to socket: closing: %s", strerror(errno));
goto err;
}
remaining -= (size_t) n;
buffer = buffer + n;
}
return 0;
ssize_t n;
while (remaining > 0) {
n = read(fd, buffer, remaining);
if (n == 0) {
syslog(LOG_CRIT, "EOF reading from socket: closing\n");
goto err;
}
if (n < 0) {
syslog(LOG_CRIT,
"Failure reading from socket: closing: %s",
strerror(errno));
goto err;
}
remaining -= (size_t) n;
buffer = buffer + n;
}
return 0;
err:
/* On error: stop listening to the socket */
shutdown(fd, SHUT_WR);
return -1;
/*
* On error: stop reading from the socket and trigger a clean
* shutdown
*/
shutdown(fd, SHUT_RD);
return -1;
}
struct init_message *create_init_message(){
struct init_message *m = (struct init_message*) malloc(sizeof(struct init_message));
bzero(m, sizeof(struct init_message));
memcpy(&m->hello[0], &expected_hello[0], sizeof(m->hello));
m->version = CURRENT_VERSION;
memset(&m->commit[0], 0, sizeof(m->commit));
return m;
int really_write(int fd, uint8_t *buffer, size_t total)
{
size_t remaining = total;
ssize_t n;
while (remaining > 0) {
n = write(fd, buffer, remaining);
if (n == 0) {
syslog(LOG_CRIT, "EOF writing to socket: closing");
goto err;
}
if (n < 0) {
syslog(LOG_CRIT,
"Failure writing to socket: closing: %s",
strerror(errno));
goto err;
}
remaining -= (size_t) n;
buffer = buffer + n;
}
return 0;
err:
/* On error: stop listening to the socket */
shutdown(fd, SHUT_WR);
return -1;
}
char *print_init_message(struct init_message *m) {
char tmp[41];
memcpy(&tmp[0], &m->commit[0], 40);
tmp[40] = '\000';
char *buffer = (char*) malloc(80);
int n = snprintf(buffer, 80, "version %d, commit %s", m->version, tmp);
if (n < 0) {
perror("Failed to format init_message");
exit(1);
}
return buffer;
struct init_message *create_init_message()
{
struct init_message *m =
(struct init_message *)malloc(sizeof(struct init_message));
bzero(m, sizeof(struct init_message));
memcpy(&m->hello[0], &expected_hello[0], sizeof(m->hello));
m->version = CURRENT_VERSION;
memset(&m->commit[0], 0, sizeof(m->commit));
return m;
}
int read_init_message(int fd, struct init_message *ci) {
bzero(ci, sizeof(struct init_message));
if (really_read(fd, (uint8_t*) &ci->hello[0], sizeof(ci->hello)) == -1){
syslog(LOG_CRIT, "Failed to read hello from client");
return -1;
}
if (memcmp(&ci->hello[0], &expected_hello_old[0], sizeof(expected_hello_old)) == 0) {
ci->version = 0;
return 0;
}
if (memcmp(&ci->hello[0], &expected_hello[0], sizeof(expected_hello)) != 0) {
syslog(LOG_CRIT, "Failed to read header magic from client");
return -1;
}
if (really_read(fd, (uint8_t*) &ci->version, sizeof(ci->version)) == -1){
syslog(LOG_CRIT, "Failed to read header version from client");
return -1;
}
if (really_read(fd, (uint8_t*) &ci->commit[0], sizeof(ci->commit)) == -1){
syslog(LOG_CRIT, "Failed to read header hash from client");
return -1;
}
return 0;
char *print_init_message(struct init_message *m)
{
char tmp[41];
memcpy(&tmp[0], &m->commit[0], 40);
tmp[40] = '\000';
char *buffer = (char *)malloc(80);
int n;
n = snprintf(buffer, 80, "version %d, commit %s", m->version, tmp);
if (n < 0) {
perror("Failed to format init_message");
exit(1);
}
return buffer;
}
int write_init_message(int fd, struct init_message *ci) {
if (really_write(fd, (uint8_t*) &ci->hello[0], sizeof(ci->hello)) == -1){
syslog(LOG_CRIT, "Failed to write hello to client");
return -1;
}
if (ci->version > 0) {
if (really_write(fd, (uint8_t*) &ci->version, sizeof(ci->version)) == -1){
syslog(LOG_CRIT, "Failed to write version to client");
return -1;
}
if (really_write(fd, (uint8_t*) &ci->commit[0], sizeof(ci->commit)) == -1){
syslog(LOG_CRIT, "Failed to write header hash to client");
return -1;
}
}
return 0;
int read_init_message(int fd, struct init_message *ci)
{
int res;
bzero(ci, sizeof(struct init_message));
res = really_read(fd, (uint8_t *)&ci->hello[0], sizeof(ci->hello));
if (res == -1) {
syslog(LOG_CRIT, "Failed to read hello from client");
return -1;
}
res = memcmp(&ci->hello[0],
&expected_hello_old[0], sizeof(expected_hello_old));
if (res == 0) {
ci->version = 0;
return 0;
}
res = memcmp(&ci->hello[0],
&expected_hello[0], sizeof(expected_hello));
if (res != 0) {
syslog(LOG_CRIT, "Failed to read header magic from client");
return -1;
}
res = really_read(fd, (uint8_t *)&ci->version, sizeof(ci->version));
if (res == -1) {
syslog(LOG_CRIT, "Failed to read header version from client");
return -1;
}
res = really_read(fd, (uint8_t *)&ci->commit[0], sizeof(ci->commit));
if (res == -1) {
syslog(LOG_CRIT, "Failed to read header hash from client");
return -1;
}
return 0;
}
int read_vif_info(int fd, struct vif_info *vif) {
uint8_t buffer[10];
if (really_read(fd, &buffer[0], sizeof(buffer)) == -1){
syslog(LOG_CRIT, "Failed to read vif info from client");
return -1;
}
vif->mtu = (size_t) (buffer[0] | (buffer[1] << 8));
vif->max_packet_size = (size_t) (buffer[2] | (buffer[3] << 8));
memcpy(vif->mac, &buffer[4], 6);
return 0;
int write_init_message(int fd, struct init_message *ci)
{
int res;
res = really_write(fd, (uint8_t *)&ci->hello[0], sizeof(ci->hello));
if (res == -1) {
syslog(LOG_CRIT, "Failed to write hello to client");
return -1;
}
if (ci->version > 0) {
res = really_write(fd, (uint8_t *)&ci->version,
sizeof(ci->version));
if (res == -1) {
syslog(LOG_CRIT, "Failed to write version to client");
return -1;
}
res = really_write(fd, (uint8_t *)&ci->commit[0],
sizeof(ci->commit));
if (res == -1) {
syslog(LOG_CRIT,
"Failed to write header hash to client");
return -1;
}
}
return 0;
}
int read_vif_info(int fd, struct vif_info *vif)
{
uint8_t buffer[10];
if (really_read(fd, &buffer[0], sizeof(buffer)) == -1) {
syslog(LOG_CRIT, "Failed to read vif info from client");
return -1;
}
vif->mtu = (size_t)(buffer[0] | (buffer[1] << 8));
vif->max_packet_size = (size_t)(buffer[2] | (buffer[3] << 8));
memcpy(vif->mac, &buffer[4], 6);
return 0;
}
int write_vif_info(int fd, struct vif_info *vif) {
uint8_t buffer[10];
buffer[0] = (uint8_t) ((vif->mtu >> 0) & 0xff);
buffer[1] = (uint8_t) ((vif->mtu >> 8) & 0xff);
buffer[2] = (uint8_t) ((vif->max_packet_size >> 0) & 0xff);
buffer[3] = (uint8_t) ((vif->max_packet_size >> 8) & 0xff);
memcpy(&buffer[0] + 4, &(vif->mac)[0], 6);
if (really_write(fd, &buffer[0], sizeof(buffer)) == -1){
syslog(LOG_CRIT, "Failed to write vif into to client");
return -1;
}
return 0;
int write_vif_info(int fd, struct vif_info *vif)
{
uint8_t buffer[10];
buffer[0] = (uint8_t) ((vif->mtu >> 0) & 0xff);
buffer[1] = (uint8_t) ((vif->mtu >> 8) & 0xff);
buffer[2] = (uint8_t) ((vif->max_packet_size >> 0) & 0xff);
buffer[3] = (uint8_t) ((vif->max_packet_size >> 8) & 0xff);
memcpy(&buffer[0] + 4, &(vif->mac)[0], 6);
if (really_write(fd, &buffer[0], sizeof(buffer)) == -1) {
syslog(LOG_CRIT, "Failed to write vif into to client");
return -1;
}
return 0;
}
int write_command(int fd, enum command *c) {
uint8_t command = *c;
if (really_write(fd, (uint8_t*) &command, sizeof(command)) == -1){
syslog(LOG_CRIT, "Failed to write command to client");
return -1;
}
return 0;
int write_command(int fd, enum command *c)
{
uint8_t command = *c;
if (really_write(fd, (uint8_t *)&command, sizeof(command)) == -1) {
syslog(LOG_CRIT, "Failed to write command to client");
return -1;
}
return 0;
}
int write_ethernet_args(int fd, struct ethernet_args *args){
if (really_write(fd, (uint8_t*) &args->uuid_string[0], 36) == -1){
syslog(LOG_CRIT, "Failed to write ethernet args to client");
return -1;
}
return 0;
int write_ethernet_args(int fd, struct ethernet_args *args)
{
if (really_write(fd, (uint8_t *)&args->uuid_string[0], 36) == -1) {
syslog(LOG_CRIT, "Failed to write ethernet args to client");
return -1;
}
return 0;
}

27
alpine/packages/tap-vsockd/protocol.h
View File

@ -7,14 +7,17 @@
/* Client -> Server init_message */
/* Server -> Client init_message */
struct init_message {
char hello[5];
uint8_t _padding[3];
uint32_t version;
char commit[40]; /* git sha of the compiled commit */
char hello[5];
uint8_t _padding[3];
uint32_t version;
char commit[40]; /* git sha of the compiled commit */
};
/* This should be bumped whenever we add something (like a feature or a bugfix)
and we wish the UI to be able to detect when to trigger a reinstall. */
/*
* This should be bumped whenever we add something (like a feature or a
* bugfix) and we wish the UI to be able to detect when to trigger a
* reinstall.
*/
#define CURRENT_VERSION 13
extern struct init_message *create_init_message(void);
@ -24,24 +27,24 @@ extern char *print_init_message(struct init_message *m);
/* Client -> Server command */
enum command {
ethernet = 1,
ethernet = 1,
};
extern int write_command(int fd, enum command *c);
/* Client -> Server command arguments */
struct ethernet_args {
char uuid_string[36];
char uuid_string[36];
};
extern int write_ethernet_args(int fd, struct ethernet_args *args);
/* Server -> Client: details of a vif */
struct vif_info {
uint8_t mac[6];
short _padding;
size_t max_packet_size;
size_t mtu;
uint8_t mac[6];
short _padding;
size_t max_packet_size;
size_t mtu;
};
extern int read_vif_info(int fd, struct vif_info *vif);

716
alpine/packages/tap-vsockd/tap-vsockd.c
View File

@ -1,6 +1,3 @@
/*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -25,421 +22,460 @@
#include <sys/wait.h>
#include <ifaddrs.h>
#include "hvsock.h"
#include "protocol.h"
int daemon_flag = 0;
int listen_flag = 0;
int connect_flag = 0;
int daemon_flag;
int listen_flag;
int connect_flag;
char *default_sid = "30D48B34-7D27-4B0B-AAAF-BBBED334DD59";
void fatal(const char *msg)
{
syslog(LOG_CRIT, "%s Error: %d. %s", msg, errno, strerror(errno));
exit(1);
syslog(LOG_CRIT, "%s Error: %d. %s", msg, errno, strerror(errno));
exit(1);
}
int alloc_tap(const char *dev) {
int fd;
struct ifreq ifr;
const char *clonedev = "/dev/net/tun";
if ((fd = open(clonedev, O_RDWR)) == -1) {
fatal("Failed to open /dev/net/tun");
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if (ioctl(fd, TUNSETIFF, (void*) &ifr) < 0) {
fatal("TUNSETIFF failed");
}
int persist = 1;
if (ioctl(fd, TUNSETPERSIST, persist) < 0) {
fatal("TUNSETPERSIST failed");
}
syslog(LOG_INFO, "successfully created TAP device %s", dev);
return fd;
int alloc_tap(const char *dev)
{
const char *clonedev = "/dev/net/tun";
struct ifreq ifr;
int persist = 1;
int fd;
fd = open(clonedev, O_RDWR);
if (fd == -1)
fatal("Failed to open /dev/net/tun");
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0)
fatal("TUNSETIFF failed");
if (ioctl(fd, TUNSETPERSIST, persist) < 0)
fatal("TUNSETPERSIST failed");
syslog(LOG_INFO, "successfully created TAP device %s", dev);
return fd;
}
void set_macaddr(const char *dev, uint8_t *mac) {
int fd;
struct ifreq ifq;
void set_macaddr(const char *dev, uint8_t *mac)
{
struct ifreq ifq;
int fd;
fd = socket(PF_INET, SOCK_DGRAM, 0);
strcpy(ifq.ifr_name, dev);
memcpy(&ifq.ifr_hwaddr.sa_data[0], mac, 6);
ifq.ifr_hwaddr.sa_family = ARPHRD_ETHER;
fd = socket(PF_INET, SOCK_DGRAM, 0);
strcpy(ifq.ifr_name, dev);
memcpy(&ifq.ifr_hwaddr.sa_data[0], mac, 6);
ifq.ifr_hwaddr.sa_family = ARPHRD_ETHER;
if (ioctl(fd, SIOCSIFHWADDR, &ifq) == -1) {
fatal("SIOCSIFHWADDR failed");
}
if (ioctl(fd, SIOCSIFHWADDR, &ifq) == -1)
fatal("SIOCSIFHWADDR failed");
close(fd);
close(fd);
}
/* Negotiate a vmnet connection, returns 0 on success and 1 on error. */
int negotiate(int fd, struct vif_info *vif)
{
/* Negotiate with com.docker.slirp */
struct init_message *me = create_init_message();
if (write_init_message(fd, me) == -1) {
goto err;
}
struct init_message you;
if (read_init_message(fd, &you) == -1) {
goto err;
}
char *txt = print_init_message(&you);
syslog(LOG_INFO, "Server reports %s", txt);
free(txt);
enum command command = ethernet;
if (write_command(fd, &command) == -1) {
goto err;
}
struct ethernet_args args;
/* We don't need a uuid */
memset(&args.uuid_string[0], 0, sizeof(args.uuid_string));
if (write_ethernet_args(fd, &args) == -1) {
goto err;
}
if (read_vif_info(fd, vif) == -1) {
goto err;
}
return 0;
/* Negotiate with com.docker.slirp */
struct init_message *me = create_init_message();
enum command command = ethernet;
struct ethernet_args args;
struct init_message you;
char *txt;
if (write_init_message(fd, me) == -1)
goto err;
if (read_init_message(fd, &you) == -1)
goto err;
txt = print_init_message(&you);
syslog(LOG_INFO, "Server reports %s", txt);
free(txt);
if (write_command(fd, &command) == -1)
goto err;
/* We don't need a uuid */
memset(&args.uuid_string[0], 0, sizeof(args.uuid_string));
if (write_ethernet_args(fd, &args) == -1)
goto err;
if (read_vif_info(fd, vif) == -1)
goto err;
return 0;
err:
syslog(LOG_CRIT, "Failed to negotiate vmnet connection");
return 1;
syslog(LOG_CRIT, "Failed to negotiate vmnet connection");
return 1;
}
/* Argument passed to proxy threads */
struct connection {
int fd; /* Hyper-V socket with vmnet protocol */
int tapfd; /* TAP device with ethernet frames */
struct vif_info vif; /* Contains VIF MAC, MTU etc, received from server */
int fd; /* Hyper-V socket with vmnet protocol */
int tapfd; /* TAP device with ethernet frames */
struct vif_info vif; /* Contains MAC, MTU etc, received from server */
};
static void* vmnet_to_tap(void *arg)
static void *vmnet_to_tap(void *arg)
{
int length, n;
struct connection *connection = (struct connection*) arg;
uint8_t header[2];
uint8_t buffer[2048];
struct connection *connection = (struct connection *)arg;
uint8_t buffer[2048];
uint8_t header[2];
int length, n;
for (;;) {
if (really_read(connection->fd, &header[0], 2) == -1){
fatal("Failed to read a packet header from host");
}
length = (header[0] & 0xff) | ((header[1] & 0xff) << 8);
if (length > sizeof(buffer)) {
syslog(LOG_CRIT, "Received an over-large packet: %d > %ld", length, sizeof(buffer));
exit(1);
}
if (really_read(connection->fd, &buffer[0], length) == -1){
syslog(LOG_CRIT, "Failed to read packet contents from host");
exit(1);
}
n = write(connection->tapfd, &buffer[0], length);
if (n != length) {
syslog(LOG_CRIT, "Failed to write %d bytes to tap device (wrote %d)", length, n);
exit(1);
}
}
for (;;) {
if (really_read(connection->fd, &header[0], 2) == -1)
fatal("Failed to read a packet header from host");
length = (header[0] & 0xff) | ((header[1] & 0xff) << 8);
if (length > sizeof(buffer)) {
syslog(LOG_CRIT,
"Received an over-large packet: %d > %ld",
length, sizeof(buffer));
exit(1);
}
if (really_read(connection->fd, &buffer[0], length) == -1) {
syslog(LOG_CRIT,
"Failed to read packet contents from host");
exit(1);
}
n = write(connection->tapfd, &buffer[0], length);
if (n != length) {
syslog(LOG_CRIT,
"Failed to write %d bytes to tap device (wrote %d)", length, n);
exit(1);
}
}
}
static void* tap_to_vmnet(void *arg)
static void *tap_to_vmnet(void *arg)
{
int length;
struct connection *connection = (struct connection*) arg;
uint8_t header[2];
uint8_t buffer[2048];
struct connection *connection = (struct connection *)arg;
uint8_t buffer[2048];
uint8_t header[2];
int length;
for (;;) {
length = read(connection->tapfd, &buffer[0], sizeof(buffer));
if (length == -1) {
if (errno == ENXIO) {
fatal("tap device has gone down");
}
syslog(LOG_WARNING, "ignoring error %d", errno);
/* This is what mirage-net-unix does. Is it a good idea really? */
continue;
}
header[0] = (length >> 0) & 0xff;
header[1] = (length >> 8) & 0xff;
if (really_write(connection->fd, &header[0], 2) == -1){
fatal("Failed to write packet header");
}
if (really_write(connection->fd, &buffer[0], length) == -1) {
fatal("Failed to write packet body");
}
}
return NULL;
for (;;) {
length = read(connection->tapfd, &buffer[0], sizeof(buffer));
if (length == -1) {
if (errno == ENXIO)
fatal("tap device has gone down");
syslog(LOG_WARNING, "ignoring error %d", errno);
/*
* This is what mirage-net-unix does. Is it a good
* idea really?
*/
continue;
}
header[0] = (length >> 0) & 0xff;
header[1] = (length >> 8) & 0xff;
if (really_write(connection->fd, &header[0], 2) == -1)
fatal("Failed to write packet header");
if (really_write(connection->fd, &buffer[0], length) == -1)
fatal("Failed to write packet body");
}
return NULL;
}
/* Handle a connection by exchanging ethernet frames forever.
/*
* Handle a connection by exchanging ethernet frames forever.
*/
static void handle(struct connection *connection)
{
pthread_t v2t, t2v;
pthread_t v2t, t2v;
if (pthread_create(&v2t, NULL, vmnet_to_tap, connection) != 0){
fatal("Failed to create the vmnet_to_tap thread");
}
if (pthread_create(&t2v, NULL, tap_to_vmnet, connection) != 0){
fatal("Failed to create the tap_to_vmnet thread");
}
if (pthread_join(v2t, NULL) != 0){
fatal("Failed to join the vmnet_to_tap thread");
}
if (pthread_join(t2v, NULL) != 0){
fatal("Failed to join the tap_to_vmnet thread");
}
if (pthread_create(&v2t, NULL, vmnet_to_tap, connection) != 0)
fatal("Failed to create the vmnet_to_tap thread");
if (pthread_create(&t2v, NULL, tap_to_vmnet, connection) != 0)
fatal("Failed to create the tap_to_vmnet thread");
if (pthread_join(v2t, NULL) != 0)
fatal("Failed to join the vmnet_to_tap thread");
if (pthread_join(t2v, NULL) != 0)
fatal("Failed to join the tap_to_vmnet thread");
}
static int create_listening_socket(GUID serviceid) {
int lsock = -1;
SOCKADDR_HV sa;
int res;
static int create_listening_socket(GUID serviceid)
{
SOCKADDR_HV sa;
int lsock = -1;
int res;
lsock = socket(AF_HYPERV, SOCK_STREAM, HV_PROTOCOL_RAW);
if (lsock == -1) {
fatal("socket()");
}
lsock = socket(AF_HYPERV, SOCK_STREAM, HV_PROTOCOL_RAW);
if (lsock == -1)
fatal("socket()");
sa.Family = AF_HYPERV;
sa.Reserved = 0;
sa.VmId = HV_GUID_WILDCARD;
sa.ServiceId = serviceid;
sa.Family = AF_HYPERV;
sa.Reserved = 0;
sa.VmId = HV_GUID_WILDCARD;
sa.ServiceId = serviceid;
res = bind(lsock, (const struct sockaddr *)&sa, sizeof(sa));
if (res == -1) {
fatal("bind()");
}
res = bind(lsock, (const struct sockaddr *)&sa, sizeof(sa));
if (res == -1)
fatal("bind()");
res = listen(lsock, SOMAXCONN);
if (res == -1) {
fatal("listen()");
}
return lsock;
res = listen(lsock, SOMAXCONN);
if (res == -1)
fatal("listen()");
return lsock;
}
static int connect_socket(GUID serviceid) {
int sock = -1;
SOCKADDR_HV sa;
int res;
static int connect_socket(GUID serviceid)
{
SOCKADDR_HV sa;
int sock = -1;
int res;
sock = socket(AF_HYPERV, SOCK_STREAM, HV_PROTOCOL_RAW);
if (sock == -1) {
fatal("socket()");
}
sock = socket(AF_HYPERV, SOCK_STREAM, HV_PROTOCOL_RAW);
if (sock == -1)
fatal("socket()");
sa.Family = AF_HYPERV;
sa.Reserved = 0;
sa.VmId = HV_GUID_PARENT;
sa.ServiceId = serviceid;
sa.Family = AF_HYPERV;
sa.Reserved = 0;
sa.VmId = HV_GUID_PARENT;
sa.ServiceId = serviceid;
res = connect(sock, (const struct sockaddr *)&sa, sizeof(sa));
if (res == -1) {
fatal("connect()");
}
res = connect(sock, (const struct sockaddr *)&sa, sizeof(sa));
if (res == -1)
fatal("connect()");
return sock;
return sock;
}
static int accept_socket(int lsock) {
int csock = -1;
SOCKADDR_HV sac;
socklen_t socklen = sizeof(sac);
static int accept_socket(int lsock)
{
SOCKADDR_HV sac;
socklen_t socklen = sizeof(sac);
int csock = -1;
csock = accept(lsock, (struct sockaddr *)&sac, &socklen);
if (csock == -1) {
fatal("accept()");
}
csock = accept(lsock, (struct sockaddr *)&sac, &socklen);
if (csock == -1)
fatal("accept()");
syslog(LOG_INFO, "Connect from: "GUID_FMT":"GUID_FMT"\n",
GUID_ARGS(sac.VmId), GUID_ARGS(sac.ServiceId));
return csock;
syslog(LOG_INFO, "Connect from: " GUID_FMT ":" GUID_FMT "\n",
GUID_ARGS(sac.VmId), GUID_ARGS(sac.ServiceId));
return csock;
}
void write_pidfile(const char *pidfile) {
pid_t pid = getpid();
char * pid_s;
FILE *file;
int len;
void write_pidfile(const char *pidfile)
{
pid_t pid = getpid();
char *pid_s;
FILE *file;
int len;
if (asprintf(&pid_s, "%lld", (long long) pid) == -1) {
fatal("Failed to allocate pidfile string");
}
len = strlen(pid_s);
file = fopen(pidfile, "w");
if (file == NULL) {
syslog(LOG_CRIT, "Failed to open pidfile %s", pidfile);
exit(1);
}
if (asprintf(&pid_s, "%lld", (long long)pid) == -1)
fatal("Failed to allocate pidfile string");
if (fwrite(pid_s, 1, len, file) != len) {
fatal("Failed to write pid to pidfile");
}
fclose(file);
free(pid_s);
len = strlen(pid_s);
file = fopen(pidfile, "w");
if (file == NULL) {
syslog(LOG_CRIT, "Failed to open pidfile %s", pidfile);
exit(1);
}
if (fwrite(pid_s, 1, len, file) != len)
fatal("Failed to write pid to pidfile");
fclose(file);
free(pid_s);
}
void daemonize(const char *pidfile){
pid_t pid = fork ();
if (pid == -1) {
fatal("Failed to fork()");
}
else if (pid != 0)
exit(0);
if (setsid () == -1) {
fatal("Failed to setsid()");
}
if (chdir ("/") == -1) {
fatal("Failed to chdir()");
}
int null = open("/dev/null", O_RDWR);
dup2(null, STDIN_FILENO);
dup2(null, STDOUT_FILENO);
dup2(null, STDERR_FILENO);
close(null);
if (pidfile) write_pidfile(pidfile);
void daemonize(const char *pidfile)
{
pid_t pid;
int null;
pid = fork();
if (pid == -1)
fatal("Failed to fork()");
else if (pid != 0)
exit(0);
if (setsid() == -1)
fatal("Failed to setsid()");
if (chdir("/") == -1)
fatal("Failed to chdir()");
null = open("/dev/null", O_RDWR);
dup2(null, STDIN_FILENO);
dup2(null, STDOUT_FILENO);
dup2(null, STDERR_FILENO);
close(null);
if (pidfile)
write_pidfile(pidfile);
}
void usage(char *name)
{
printf("%s usage:\n", name);
printf("\t[--daemon] [--tap <name>] [--serviceid <guid>] [--pid <file>]\n");
printf("\t[--listen | --connect]\n\n");
printf("where\n");
printf("\t--daemonize: run as a background daemon\n");
printf("\t--tap <name>: create a tap device with the given name\n");
printf("\t (defaults to eth1)\n");
printf("\t--serviceid <guid>: use <guid> as the well-known service GUID\n");
printf("\t (defaults to %s)\n", default_sid);
printf("\t--pid <file>: write a pid to the given file\n");
printf("\t--listen: listen forever for incoming AF_HVSOCK connections\n");
printf("\t--connect: connect to the parent partition\n");
printf("%s usage:\n", name);
printf("\t[--daemon] [--tap <name>] [--serviceid <guid>] [--pid <file>]\n");
printf("\t[--listen | --connect]\n\n");
printf("where\n");
printf("\t--daemonize: run as a background daemon\n");
printf("\t--tap <name>: create a tap device with the given name\n");
printf("\t (defaults to eth1)\n");
printf("\t--serviceid <guid>: use <guid> as the well-known service GUID\n");
printf("\t (defaults to %s)\n", default_sid);
printf("\t--pid <file>: write a pid to the given file\n");
printf("\t--listen: listen forever for incoming AF_HVSOCK connections\n");
printf("\t--connect: connect to the parent partition\n");
}
int main(int argc, char **argv)
{
int res = 0;
GUID sid;
int c;
/* Defaults to a testing GUID */
char *serviceid = default_sid;
char *tap = "eth1";
char *pidfile = NULL;
char *serviceid = default_sid;
struct connection connection;
char *tap = "eth1";
char *pidfile = NULL;
int lsocket = -1;
int sock = -1;
int res = 0;
int status;
pid_t child;
int tapfd;
GUID sid;
int c;
opterr = 0;
while (1) {
static struct option long_options[] = {
/* These options set a flag. */
{"daemon", no_argument, &daemon_flag, 1},
{"serviceid", required_argument, NULL, 's'},
{"tap", required_argument, NULL, 't'},
{"pidfile", required_argument, NULL, 'p'},
{"listen", no_argument, &listen_flag, 1},
{"connect", no_argument, &connect_flag, 1},
{0, 0, 0, 0}
};
int option_index = 0;
int option_index;
int log_flags = LOG_CONS | LOG_NDELAY;
static struct option long_options[] = {
/* These options set a flag. */
{"daemon", no_argument, &daemon_flag, 1},
{"serviceid", required_argument, NULL, 's'},
{"tap", required_argument, NULL, 't'},
{"pidfile", required_argument, NULL, 'p'},
{"listen", no_argument, &listen_flag, 1},
{"connect", no_argument, &connect_flag, 1},
{0, 0, 0, 0}
};
c = getopt_long (argc, argv, "ds:t:p:", long_options, &option_index);
if (c == -1) break;
opterr = 0;
while (1) {
option_index = 0;
switch (c) {
case 'd':
daemon_flag = 1;
break;
case 's':
serviceid = optarg;
break;
case 't':
tap = optarg;
break;
case 'p':
pidfile = optarg;
break;
case 0:
break;
default:
usage (argv[0]);
exit (1);
}
}
if ((listen_flag && connect_flag) || !(listen_flag || connect_flag)){
fprintf(stderr, "Please supply either the --listen or --connect flag, but not both.\n");
exit(1);
}
if (daemon_flag && !pidfile){
fprintf(stderr, "For daemon mode, please supply a --pidfile argument.\n");
exit(1);
}
res = parseguid(serviceid, &sid);
if (res) {
fprintf(stderr, "Failed to parse serviceid as GUID: %s\n", serviceid);
usage(argv[0]);
exit(1);
}
c = getopt_long(argc, argv, "ds:t:p:",
long_options, &option_index);
if (c == -1)
break;
int log_flags = LOG_CONS | LOG_NDELAY;
if (!daemon_flag) {
log_flags |= LOG_PERROR;
}
openlog(argv[0], log_flags, LOG_DAEMON);
switch (c) {
case 'd':
daemon_flag = 1;
break;
case 's':
serviceid = optarg;
break;
case 't':
tap = optarg;
break;
case 'p':
pidfile = optarg;
break;
case 0:
break;
default:
usage(argv[0]);
exit(1);
}
}
int tapfd = alloc_tap(tap);
if ((listen_flag && connect_flag) || !(listen_flag || connect_flag)) {
fprintf(stderr, "Please supply either the --listen or --connect flag, but not both.\n");
exit(1);
}
struct connection connection;
connection.tapfd = tapfd;
if (daemon_flag && !pidfile) {
fprintf(stderr, "For daemon mode, please supply a --pidfile argument.\n");
exit(1);
}
int sock = -1;
int lsocket = -1;
if (listen_flag) {
syslog(LOG_INFO, "starting in listening mode with serviceid=%s and tap=%s", serviceid, tap);
lsocket = create_listening_socket(sid);
} else {
syslog(LOG_INFO, "starting in connect mode with serviceid=%s and tap=%s", serviceid, tap);
}
res = parseguid(serviceid, &sid);
if (res) {
fprintf(stderr, "Failed to parse serviceid as GUID: %s\n", serviceid);
usage(argv[0]);
exit(1);
}
for (;;) {
if (sock != -1) {
close(sock);
sock = -1;
}
if (listen_flag) {
sock = accept_socket(lsocket);
} else {
sock = connect_socket(sid);
}
if (!daemon_flag)
log_flags |= LOG_PERROR;
connection.fd = sock;
if (negotiate(sock, &connection.vif) != 0) {
sleep(1);
continue;
}
syslog(LOG_INFO, "VMNET VIF has MAC %02x:%02x:%02x:%02x:%02x:%02x",
connection.vif.mac[0], connection.vif.mac[1], connection.vif.mac[2],
connection.vif.mac[3], connection.vif.mac[4], connection.vif.mac[5]
);
set_macaddr(tap, &connection.vif.mac[0]);
openlog(argv[0], log_flags, LOG_DAEMON);
/* Daemonize after we've made our first reliable connection */
if (daemon_flag) {
daemon_flag = 0;
daemonize(pidfile);
}
/* Run the multithreaded part in a subprocess. On error the process will
exit() which tears down all the threads */
pid_t child = fork();
if (child == 0) {
handle(&connection);
/* should never happen but just in case of a logic bug in handle */
exit(1);
}
int status;
while (waitpid(child, &status, 0) == -1) { }
}
tapfd = alloc_tap(tap);
connection.tapfd = tapfd;
if (listen_flag) {
syslog(LOG_INFO, "starting in listening mode with serviceid=%s and tap=%s", serviceid, tap);
lsocket = create_listening_socket(sid);
} else {
syslog(LOG_INFO, "starting in connect mode with serviceid=%s and tap=%s", serviceid, tap);
}
for (;;) {
if (sock != -1) {
close(sock);
sock = -1;
}
if (listen_flag)
sock = accept_socket(lsocket);
else
sock = connect_socket(sid);
connection.fd = sock;
if (negotiate(sock, &connection.vif) != 0) {
sleep(1);
continue;
}
syslog(LOG_INFO, "VMNET VIF has MAC %02x:%02x:%02x:%02x:%02x:%02x",
connection.vif.mac[0], connection.vif.mac[1], connection.vif.mac[2],
connection.vif.mac[3], connection.vif.mac[4], connection.vif.mac[5]
);
set_macaddr(tap, &connection.vif.mac[0]);
/* Daemonize after we've made our first reliable connection */
if (daemon_flag) {
daemon_flag = 0;
daemonize(pidfile);
}
/*
* Run the multithreaded part in a subprocess. On error the
* process will exit() which tears down all the threads
*/
child = fork();
if (child == 0) {
handle(&connection);
/*
* should never happen but just in case of a logic
* bug in handle
*/
exit(1);
}
for (;;) {
if (waitpid(child, &status, 0) != -1)
break;
}
}
}