UDP char device (initial patch by Jason Wessel) - TCP char device
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2007 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
3532fa7402
commit
0bab00f30f
@ -496,8 +496,14 @@ Debug/Expert options:
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@table @option
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@item -serial dev
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Redirect the virtual serial port to host device @var{dev}. Available
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devices are:
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Redirect the virtual serial port to host character device
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@var{dev}. The default device is @code{vc} in graphical mode and
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@code{stdio} in non graphical mode.
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This option can be used several times to simulate up to 4 serials
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ports.
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Available character devices are:
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@table @code
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@item vc
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Virtual console
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@ -516,13 +522,47 @@ Write output to filename. No character can be read.
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@item stdio
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[Unix only] standard input/output
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@item pipe:filename
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[Unix only] name pipe @var{filename}
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@end table
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The default device is @code{vc} in graphical mode and @code{stdio} in
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non graphical mode.
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name pipe @var{filename}
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@item COMn
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[Windows only] Use host serial port @var{n}
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@item udp:remote_port
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UDP Net Console sent to locahost at remote_port
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@item udp:remote_host:remote_port
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UDP Net Console sent to remote_host at remote_port
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@item udp:src_port:remote_host:remote_port
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UDP Net Console sent from src_port to remote_host at the remote_port.
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This option can be used several times to simulate up to 4 serials
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ports.
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The udp:* sub options are primary intended for netconsole. If you
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just want a simple readonly console you can use @code{netcat} or
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@code{nc}, by starting qemu with: @code{-serial udp:4555} and nc as:
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@code{nc -u -l -p 4555}. Any time qemu writes something to that port
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it will appear in the netconsole session.
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If you plan to send characters back via netconsole or you want to stop
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and start qemu a lot of times, you should have qemu use the same
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source port each time by using something like @code{-serial
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udp:4556:localhost:4555} to qemu. Another approach is to use a patched
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version of netcat which can listen to a TCP port and send and receive
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characters via udp. If you have a patched version of netcat which
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activates telnet remote echo and single char transfer, then you can
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use the following options to step up a netcat redirector to allow
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telnet on port 5555 to access the qemu port.
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@table @code
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@item Qemu Options
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-serial udp:4556:localhost:4555
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@item netcat options
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-u -P 4555 -L localhost:4556 -t -p 5555 -I -T
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@end table
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@item tcp:remote_host:remote_port
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TCP Net Console sent to remote_host at the remote_port
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@item tcpl:host:port
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TCP Net Console: wait for connection on @var{host} on the local port
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@var{port}. If host is omitted, 0.0.0.0 is assumed. Only one TCP
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connection at a time is accepted. You can use @code{telnet} to connect
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to the corresponding character device.
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@end table
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@item -parallel dev
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Redirect the virtual parallel port to host device @var{dev} (same
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381
vl.c
381
vl.c
@ -2130,6 +2130,373 @@ CharDriverState *qemu_chr_open_win_file_out(const char *file_out)
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}
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#endif
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/***********************************************************/
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/* UDP Net console */
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typedef struct {
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IOCanRWHandler *fd_can_read;
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IOReadHandler *fd_read;
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void *fd_opaque;
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int fd;
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struct sockaddr_in daddr;
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char buf[1024];
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int bufcnt;
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int bufptr;
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int max_size;
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} NetCharDriver;
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static int udp_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
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{
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NetCharDriver *s = chr->opaque;
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return sendto(s->fd, buf, len, 0,
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(struct sockaddr *)&s->daddr, sizeof(struct sockaddr_in));
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}
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static int udp_chr_read_poll(void *opaque)
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{
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CharDriverState *chr = opaque;
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NetCharDriver *s = chr->opaque;
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s->max_size = s->fd_can_read(s->fd_opaque);
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/* If there were any stray characters in the queue process them
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* first
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*/
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while (s->max_size > 0 && s->bufptr < s->bufcnt) {
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s->fd_read(s->fd_opaque, &s->buf[s->bufptr], 1);
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s->bufptr++;
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s->max_size = s->fd_can_read(s->fd_opaque);
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}
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return s->max_size;
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}
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static void udp_chr_read(void *opaque)
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{
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CharDriverState *chr = opaque;
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NetCharDriver *s = chr->opaque;
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if (s->max_size == 0)
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return;
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s->bufcnt = recv(s->fd, s->buf, sizeof(s->buf), 0);
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s->bufptr = s->bufcnt;
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if (s->bufcnt <= 0)
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return;
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s->bufptr = 0;
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while (s->max_size > 0 && s->bufptr < s->bufcnt) {
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s->fd_read(s->fd_opaque, &s->buf[s->bufptr], 1);
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s->bufptr++;
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s->max_size = s->fd_can_read(s->fd_opaque);
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}
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}
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static void udp_chr_add_read_handler(CharDriverState *chr,
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IOCanRWHandler *fd_can_read,
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IOReadHandler *fd_read, void *opaque)
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{
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NetCharDriver *s = chr->opaque;
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if (s->fd >= 0) {
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s->fd_can_read = fd_can_read;
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s->fd_read = fd_read;
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s->fd_opaque = opaque;
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qemu_set_fd_handler2(s->fd, udp_chr_read_poll,
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udp_chr_read, NULL, chr);
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}
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}
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int parse_host_port(struct sockaddr_in *saddr, const char *str);
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CharDriverState *qemu_chr_open_udp(const char *def)
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{
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CharDriverState *chr = NULL;
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NetCharDriver *s = NULL;
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int fd = -1;
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int con_type;
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struct sockaddr_in addr;
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const char *p, *r;
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int port;
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chr = qemu_mallocz(sizeof(CharDriverState));
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if (!chr)
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goto return_err;
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s = qemu_mallocz(sizeof(NetCharDriver));
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if (!s)
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goto return_err;
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fd = socket(PF_INET, SOCK_DGRAM, 0);
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if (fd < 0) {
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perror("socket(PF_INET, SOCK_DGRAM)");
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goto return_err;
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}
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/* There are three types of port definitions
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* 1) udp:remote_port
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* Juse use 0.0.0.0 for the IP and send to remote
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* 2) udp:remote_host:port
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* Use a IP and send traffic to remote
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* 3) udp:local_port:remote_host:remote_port
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* Use local_port as the originator + #2
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*/
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con_type = 0;
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p = def;
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while ((p = strchr(p, ':'))) {
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p++;
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con_type++;
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}
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p = def;
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memset(&addr,0,sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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s->daddr.sin_family = AF_INET;
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s->daddr.sin_addr.s_addr = htonl(INADDR_ANY);
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switch (con_type) {
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case 0:
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port = strtol(p, (char **)&r, 0);
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if (r == p) {
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fprintf(stderr, "Error parsing port number\n");
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goto return_err;
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}
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s->daddr.sin_port = htons((short)port);
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break;
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case 2:
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port = strtol(p, (char **)&r, 0);
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if (r == p) {
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fprintf(stderr, "Error parsing port number\n");
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goto return_err;
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}
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addr.sin_port = htons((short)port);
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p = r + 1;
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/* Fall through to case 1 now that we have the local port */
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case 1:
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if (parse_host_port(&s->daddr, p) < 0) {
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fprintf(stderr, "Error parsing host name and port\n");
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goto return_err;
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}
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break;
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default:
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fprintf(stderr, "Too many ':' characters\n");
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goto return_err;
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}
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if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
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{
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perror("bind");
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goto return_err;
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}
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s->fd = fd;
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s->bufcnt = 0;
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s->bufptr = 0;
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chr->opaque = s;
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chr->chr_write = udp_chr_write;
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chr->chr_add_read_handler = udp_chr_add_read_handler;
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return chr;
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return_err:
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if (chr)
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free(chr);
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if (s)
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free(s);
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if (fd >= 0)
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closesocket(fd);
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return NULL;
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}
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/***********************************************************/
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/* TCP Net console */
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typedef struct {
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IOCanRWHandler *fd_can_read;
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IOReadHandler *fd_read;
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void *fd_opaque;
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int fd, listen_fd;
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int connected;
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int max_size;
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} TCPCharDriver;
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static void tcp_chr_accept(void *opaque);
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static int tcp_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
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{
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TCPCharDriver *s = chr->opaque;
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if (s->connected) {
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return send_all(s->fd, buf, len);
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} else {
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/* XXX: indicate an error ? */
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return len;
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}
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}
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static int tcp_chr_read_poll(void *opaque)
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{
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CharDriverState *chr = opaque;
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TCPCharDriver *s = chr->opaque;
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if (!s->connected)
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return 0;
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s->max_size = s->fd_can_read(s->fd_opaque);
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return s->max_size;
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}
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static void tcp_chr_read(void *opaque)
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{
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CharDriverState *chr = opaque;
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TCPCharDriver *s = chr->opaque;
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uint8_t buf[1024];
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int len, size;
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if (!s->connected || s->max_size <= 0)
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return;
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len = sizeof(buf);
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if (len > s->max_size)
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len = s->max_size;
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size = recv(s->fd, buf, len, 0);
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if (size == 0) {
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/* connection closed */
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s->connected = 0;
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if (s->listen_fd >= 0) {
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qemu_set_fd_handler(s->listen_fd, tcp_chr_accept, NULL, chr);
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}
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qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
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closesocket(s->fd);
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s->fd = -1;
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} else if (size > 0) {
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s->fd_read(s->fd_opaque, buf, size);
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}
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}
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static void tcp_chr_add_read_handler(CharDriverState *chr,
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IOCanRWHandler *fd_can_read,
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IOReadHandler *fd_read, void *opaque)
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{
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TCPCharDriver *s = chr->opaque;
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s->fd_can_read = fd_can_read;
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s->fd_read = fd_read;
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s->fd_opaque = opaque;
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}
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static void tcp_chr_connect(void *opaque)
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{
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CharDriverState *chr = opaque;
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TCPCharDriver *s = chr->opaque;
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s->connected = 1;
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qemu_set_fd_handler2(s->fd, tcp_chr_read_poll,
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tcp_chr_read, NULL, chr);
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}
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static void tcp_chr_accept(void *opaque)
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{
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CharDriverState *chr = opaque;
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TCPCharDriver *s = chr->opaque;
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struct sockaddr_in saddr;
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socklen_t len;
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int fd;
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for(;;) {
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len = sizeof(saddr);
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fd = accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
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if (fd < 0 && errno != EINTR) {
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return;
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} else if (fd >= 0) {
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break;
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}
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}
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socket_set_nonblock(fd);
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s->fd = fd;
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qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
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tcp_chr_connect(chr);
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}
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static void tcp_chr_close(CharDriverState *chr)
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{
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TCPCharDriver *s = chr->opaque;
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if (s->fd >= 0)
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closesocket(s->fd);
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if (s->listen_fd >= 0)
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closesocket(s->listen_fd);
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qemu_free(s);
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}
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static CharDriverState *qemu_chr_open_tcp(const char *host_str,
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int is_listen)
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{
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CharDriverState *chr = NULL;
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TCPCharDriver *s = NULL;
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int fd = -1, ret, err, val;
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struct sockaddr_in saddr;
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if (parse_host_port(&saddr, host_str) < 0)
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goto fail;
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chr = qemu_mallocz(sizeof(CharDriverState));
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if (!chr)
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goto fail;
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s = qemu_mallocz(sizeof(TCPCharDriver));
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if (!s)
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goto fail;
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fd = socket(PF_INET, SOCK_STREAM, 0);
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if (fd < 0)
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goto fail;
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socket_set_nonblock(fd);
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s->connected = 0;
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s->fd = -1;
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s->listen_fd = -1;
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if (is_listen) {
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/* allow fast reuse */
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val = 1;
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
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ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
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if (ret < 0)
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goto fail;
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ret = listen(fd, 0);
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if (ret < 0)
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goto fail;
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s->listen_fd = fd;
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qemu_set_fd_handler(s->listen_fd, tcp_chr_accept, NULL, chr);
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} else {
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for(;;) {
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ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
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if (ret < 0) {
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err = socket_error();
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if (err == EINTR || err == EWOULDBLOCK) {
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} else if (err == EINPROGRESS) {
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break;
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} else {
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goto fail;
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}
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} else {
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s->connected = 1;
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break;
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}
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}
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s->fd = fd;
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if (s->connected)
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tcp_chr_connect(chr);
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else
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qemu_set_fd_handler(s->fd, NULL, tcp_chr_connect, chr);
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}
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chr->opaque = s;
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chr->chr_write = tcp_chr_write;
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chr->chr_add_read_handler = tcp_chr_add_read_handler;
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chr->chr_close = tcp_chr_close;
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return chr;
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fail:
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if (fd >= 0)
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closesocket(fd);
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qemu_free(s);
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qemu_free(chr);
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return NULL;
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}
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CharDriverState *qemu_chr_open(const char *filename)
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{
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const char *p;
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@ -2139,6 +2506,15 @@ CharDriverState *qemu_chr_open(const char *filename)
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} else if (!strcmp(filename, "null")) {
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return qemu_chr_open_null();
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} else
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if (strstart(filename, "tcp:", &p)) {
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return qemu_chr_open_tcp(p, 0);
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} else
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if (strstart(filename, "tcpl:", &p)) {
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return qemu_chr_open_tcp(p, 1);
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} else
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if (strstart(filename, "udp:", &p)) {
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return qemu_chr_open_udp(p);
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} else
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#ifndef _WIN32
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if (strstart(filename, "file:", &p)) {
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return qemu_chr_open_file_out(p);
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@ -2844,7 +3220,8 @@ static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
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socket_set_nonblock(fd);
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return fd;
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fail:
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if (fd>=0) close(fd);
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if (fd >= 0)
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closesocket(fd);
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return -1;
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}
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@ -2972,7 +3349,7 @@ static void net_socket_accept(void *opaque)
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}
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s1 = net_socket_fd_init(s->vlan, fd, 1);
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if (!s1) {
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close(fd);
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closesocket(fd);
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} else {
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snprintf(s1->vc->info_str, sizeof(s1->vc->info_str),
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"socket: connection from %s:%d",
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Block a user