diff options
Diffstat (limited to 'arch/um/drivers/slirp_user.c')
| -rw-r--r-- | arch/um/drivers/slirp_user.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c new file mode 100644 index 000000000000..c322515c71cc --- /dev/null +++ b/arch/um/drivers/slirp_user.c @@ -0,0 +1,201 @@ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <stddef.h> +#include <sched.h> +#include <string.h> +#include <errno.h> +#include <sys/wait.h> +#include <sys/signal.h> +#include "user_util.h" +#include "kern_util.h" +#include "user.h" +#include "net_user.h" +#include "slirp.h" +#include "slip_proto.h" +#include "helper.h" +#include "os.h" + +void slirp_user_init(void *data, void *dev) +{ + struct slirp_data *pri = data; + + pri->dev = dev; +} + +struct slirp_pre_exec_data { + int stdin; + int stdout; +}; + +static void slirp_pre_exec(void *arg) +{ + struct slirp_pre_exec_data *data = arg; + + if(data->stdin != -1) dup2(data->stdin, 0); + if(data->stdout != -1) dup2(data->stdout, 1); +} + +static int slirp_tramp(char **argv, int fd) +{ + struct slirp_pre_exec_data pe_data; + int pid; + + pe_data.stdin = fd; + pe_data.stdout = fd; + pid = run_helper(slirp_pre_exec, &pe_data, argv, NULL); + + return(pid); +} + +/* XXX This is just a trivial wrapper around os_pipe */ +static int slirp_datachan(int *mfd, int *sfd) +{ + int fds[2], err; + + err = os_pipe(fds, 1, 1); + if(err < 0){ + printk("slirp_datachan: Failed to open pipe, err = %d\n", -err); + return(err); + } + + *mfd = fds[0]; + *sfd = fds[1]; + return(0); +} + +static int slirp_open(void *data) +{ + struct slirp_data *pri = data; + int sfd, mfd, pid, err; + + err = slirp_datachan(&mfd, &sfd); + if(err) + return(err); + + pid = slirp_tramp(pri->argw.argv, sfd); + + if(pid < 0){ + printk("slirp_tramp failed - errno = %d\n", -pid); + os_close_file(sfd); + os_close_file(mfd); + return(pid); + } + + pri->slave = sfd; + pri->pos = 0; + pri->esc = 0; + + pri->pid = pid; + + return(mfd); +} + +static void slirp_close(int fd, void *data) +{ + struct slirp_data *pri = data; + int status,err; + + os_close_file(fd); + os_close_file(pri->slave); + + pri->slave = -1; + + if(pri->pid<1) { + printk("slirp_close: no child process to shut down\n"); + return; + } + +#if 0 + if(kill(pri->pid, SIGHUP)<0) { + printk("slirp_close: sending hangup to %d failed (%d)\n", + pri->pid, errno); + } +#endif + + CATCH_EINTR(err = waitpid(pri->pid, &status, WNOHANG)); + if(err < 0) { + printk("slirp_close: waitpid returned %d\n", errno); + return; + } + + if(err == 0) { + printk("slirp_close: process %d has not exited\n"); + return; + } + + pri->pid = -1; +} + +int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri) +{ + int i, n, size, start; + + if(pri->more>0) { + i = 0; + while(i < pri->more) { + size = slip_unesc(pri->ibuf[i++], + pri->ibuf,&pri->pos,&pri->esc); + if(size){ + memcpy(buf, pri->ibuf, size); + memmove(pri->ibuf, &pri->ibuf[i], pri->more-i); + pri->more=pri->more-i; + return(size); + } + } + pri->more=0; + } + + n = net_read(fd, &pri->ibuf[pri->pos], sizeof(pri->ibuf) - pri->pos); + if(n <= 0) return(n); + + start = pri->pos; + for(i = 0; i < n; i++){ + size = slip_unesc(pri->ibuf[start + i], + pri->ibuf,&pri->pos,&pri->esc); + if(size){ + memcpy(buf, pri->ibuf, size); + memmove(pri->ibuf, &pri->ibuf[start+i+1], n-(i+1)); + pri->more=n-(i+1); + return(size); + } + } + return(0); +} + +int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri) +{ + int actual, n; + + actual = slip_esc(buf, pri->obuf, len); + n = net_write(fd, pri->obuf, actual); + if(n < 0) return(n); + else return(len); +} + +static int slirp_set_mtu(int mtu, void *data) +{ + return(mtu); +} + +struct net_user_info slirp_user_info = { + .init = slirp_user_init, + .open = slirp_open, + .close = slirp_close, + .remove = NULL, + .set_mtu = slirp_set_mtu, + .add_address = NULL, + .delete_address = NULL, + .max_packet = BUF_SIZE +}; + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ |