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#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <error.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <endian.h>
#include "net9p.h"
/* "T" messages are client->server requests, and "R" messages are
* server->client responses. I do not know what the Plan 9 designers
* intended "T" and "R" to stand for.
*/
enum v9fs_msg_type {
/* "9P2000" base protocol
* https://ericvh.github.io/9p-rfc/rfc9p2000.html
* https://github.com/ericvh/9p-rfc/blob/master/9p2000.xml
*
* But due to incompleteness, the Plan 9 manual section-5 and
* the Plan 9 headers (particularly fcall.h) are a better
* references.
*/
V9FS_Tversion = 100, /* "412" "4s" */
V9FS_Rversion = 101, /* "412" "4s" */
V9FS_Tauth = 102, /* "412" "4ss" */
V9FS_Rauth = 103, /* "412" "TODO" */
V9FS_Tattach = 104, /* "412" "TODO" */
V9FS_Rattach = 105, /* "412" "TODO" */
/*V9FS_Terror = 106, /* There is no Terror request, only Rerror responses */
V9FS_Rerror = 107, /* "412" "TODO" */
V9FS_Tflush = 108, /* "412" "TODO" */
V9FS_Rflush = 109, /* "412" "TODO" */
V9FS_Twalk = 110, /* "412" "TODO" */
V9FS_Rwalk = 111, /* "412" "TODO" */
V9FS_Topen = 112, /* "412" "TODO" */
V9FS_Ropen = 113, /* "412" "TODO" */
V9FS_Tcreate = 114, /* "412" "TODO" */
V9FS_Rcreate = 115, /* "412" "TODO" */
V9FS_Tread = 116, /* "412" "TODO" */
V9FS_Rread = 117, /* "412" "TODO" */
V9FS_Twrite = 118, /* "412" "TODO" */
V9FS_Rwrite = 119, /* "412" "TODO" */
V9FS_Tclunk = 120, /* "412" "TODO" */
V9FS_Rclunk = 121, /* "412" "TODO" */
V9FS_Tremove = 122, /* "412" "TODO" */
V9FS_Rremove = 123, /* "412" "TODO" */
V9FS_Tstat = 124, /* "412" "TODO" */
V9FS_Rstat = 125, /* "412" "TODO" */
V9FS_Twstat = 126, /* "412" "TODO" */
V9FS_Rwstat = 127, /* "412" "TODO" */
/* "9P2000.u" Unix extension
* https://ericvh.github.io/9p-rfc/rfc9p2000.u.html
* https://github.com/ericvh/9p-rfc/blob/master/9p2000.u.xml
*/
/* "9P2000.L" Linux extension
* https://github.com/ericvh/9p-rfc/blob/master/9p2000.L.xml
*/
V9FS_TLERROR = 6,
V9FS_RLERROR,
V9FS_TSTATFS = 8,
V9FS_RSTATFS,
V9FS_TLOPEN = 12,
V9FS_RLOPEN,
V9FS_TLCREATE = 14,
V9FS_RLCREATE,
V9FS_TSYMLINK = 16,
V9FS_RSYMLINK,
V9FS_TMKNOD = 18,
V9FS_RMKNOD,
V9FS_TRENAME = 20,
V9FS_RRENAME,
V9FS_TREADLINK = 22,
V9FS_RREADLINK,
V9FS_TGETATTR = 24,
V9FS_RGETATTR,
V9FS_TSETATTR = 26,
V9FS_RSETATTR,
V9FS_TXATTRWALK = 30,
V9FS_RXATTRWALK,
V9FS_TXATTRCREATE = 32,
V9FS_RXATTRCREATE,
V9FS_TREADDIR = 40,
V9FS_RREADDIR,
V9FS_TFSYNC = 50,
V9FS_RFSYNC,
V9FS_TLOCK = 52,
V9FS_RLOCK,
V9FS_TGETLOCK = 54,
V9FS_RGETLOCK,
V9FS_TLINK = 70,
V9FS_RLINK,
V9FS_TMKDIR = 72,
V9FS_RMKDIR,
V9FS_TRENAMEAT = 74,
V9FS_RRENAMEAT,
V9FS_TUNLINKAT = 76,
V9FS_RUNLINKAT,
};
/* 1 - u8
* 2 - u16le
* 4 - u32le
* 8 - u16le
* d - data (u32le `n`, then `n` bytes of data)
* s - string (u16le `n`, then `n` bytes of UTF-8)
* q - qid (13 bytes, idk)
*/
static const char const *msgfmt[255] = {
/* All messages start with a "size[4] type[1] tag[2]"
* prefix; that is not included in this table. */
[V9FS_Tversion] = "max_msg_size[4] s",
[V9FS_Rversion] = "4s",
[V9FS_Tauth] = "4ss",
[V9FS_Rauth] = "q",
[V9FS_Rerror] = "s",
[V9FS_Tflush] = "2",
[V9FS_Rflush] = "",
[V9FS_Tattach] = "44ss",
[V9FS_Rattach] = "q",
[V9FS_Twalk] = "TODO",
[V9FS_Rwalk] = "TODO",
[V9FS_Topen] = "41",
[V9FS_Ropen] = "q4",
[V9FS_Tcreate] = "4s41",
[V9FS_Rcreate] = "q4",
[V9FS_Tread] = "484",
[V9FS_Rread] = "d",
[V9FS_Twrite] = "48d",
[V9FS_Rwrite] = "4",
[V9FS_Tclunk] = "4",
[V9FS_Rclunk] = "",
[V9FS_Tremove] = "4",
[V9FS_Rremove] = "",
[V9FS_Tstat] = "4",
[V9FS_Rstat] = "TODO",
[V9FS_Twstat] = "TODO",
[V9FS_Rwstat] = "",
};
void net9p_listen_cr(void *_arg) {
(void)_arg;
cr_begin();
union {
struct sockaddr_in in;
struct sockaddr gen;
} addr;
memset(&addr, 0, sizeof addr);
addr.in.sin_family = AF_INET;
addr.in.sin_port = htons(9001);
int fd = socket(AF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0);
if (fd < 0)
error(1, errno, "socket");
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int)) < 0)
error(1, errno, "setsockopt");
if (bind(fd, &addr.gen, sizeof addr) < 0)
error(1, errno, "bind");
if (listen(fd, 5) < 0)
error(1, errno, "listen");
for (;;) {
int conn = accept(fd, NULL, NULL);
if (conn < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
cr_yield();
continue;
}
error(1, errno, "accept");
}
if (!coroutine_add(net9p_worker_cr, &conn))
error(1, 0, "coroutine_add(net9p_worker_cr, &%d)", conn);
}
cr_end();
}
void net9p_worker_cr(void *_arg) {
int fd = *((int *)_arg);
cr_begin();
close(fd);
cr_end();
}
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