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/*
* path format:
* /net/raw
* raw ethernet frames (read-write)
* /net/arp
* ARP cache (currently read-only)
* /net/0.0.0.0/connect/1.2.3.4/udp/53
* connect from 0.0.0.0 (any ip) to 1.2.3.4 on udp port 53
* /net/0.0.0.0/listen/udp/53
* waits for a connection to any ip on udp port 53
* open() returns once a connection to ip 0.0.0.0 on udp port 53 is received
*/
#include "proto.h"
#include "util.h"
#include <camellia/syscalls.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
enum handle_type {
H_ETHER,
H_UDP,
H_ARP,
};
struct strqueue {
struct strqueue *next;
size_t len;
char buf[];
};
struct handle {
enum handle_type type;
struct {
struct udp_conn *c;
struct strqueue *rx, *rxlast;
} udp;
handle_t reqh;
};
static void udp_listen_callback(struct udp_conn *c, void *arg) {
struct handle *h = arg;
h->udp.c = c;
_syscall_fs_respond(h->reqh, h, 0, 0);
h->reqh = -1;
}
static void udp_recv_callback(const void *buf, size_t len, void *arg) {
struct handle *h = arg;
if (h->reqh >= 0) {
_syscall_fs_respond(h->reqh, buf, len, 0);
h->reqh = -1;
return;
}
struct strqueue *sq = malloc(sizeof(*sq) + len);
sq->next = NULL;
sq->len = len;
memcpy(sq->buf, buf, len);
if (h->udp.rx) {
h->udp.rxlast->next = sq;
h->udp.rxlast = sq;
} else {
h->udp.rx = sq;
h->udp.rxlast = sq;
}
}
static void udp_recv_enqueue(struct handle *h, handle_t reqh) {
if (h->reqh > 0) {
// TODO queue
_syscall_fs_respond(reqh, NULL, -1, 0);
} else if (h->udp.rx) {
_syscall_fs_respond(reqh, h->udp.rx->buf, h->udp.rx->len, 0);
h->udp.rx = h->udp.rx->next;
free(h->udp.rx);
} else {
h->reqh = reqh;
}
}
static void fs_open(handle_t reqh, char *path) {
#define respond(buf, val) do{ _syscall_fs_respond(reqh, buf, val, 0); return; }while(0)
struct handle *h;
if (*path != '/') respond(NULL, -1);
path++;
if (strcmp(path, "raw") == 0) {
h = malloc(sizeof *h);
h->type = H_ETHER;
respond(h, 0);
} else if (strcmp(path, "arp") == 0) {
h = malloc(sizeof *h);
h->type = H_ARP;
respond(h, 0);
}
char *save;
const char *verb, *proto, *port_s;
uint32_t srcip, dstip;
if (ip_parse(strtok_r(path, "/", &save), &srcip) < 0)
respond(NULL, -1);
if (srcip != 0) {
eprintf("unimplemented");
respond(NULL, -1);
}
verb = strtok_r(NULL, "/", &save);
if (!verb) respond(NULL, -1);
if (strcmp(verb, "listen") == 0) {
proto = strtok_r(NULL, "/", &save);
if (!proto) respond(NULL, -1);
if (strcmp(proto, "udp") == 0) {
port_s = strtok_r(NULL, "/", &save);
if (port_s) {
uint16_t port = strtol(port_s, NULL, 0);
h = malloc(sizeof *h);
memset(h, 0, sizeof *h);
h->type = H_UDP;
h->udp.c = NULL;
h->reqh = reqh;
udp_listen(port, udp_listen_callback, udp_recv_callback, h);
return;
}
}
} else if (strcmp(verb, "connect") == 0) {
if (ip_parse(strtok_r(NULL, "/", &save), &dstip) < 0)
respond(NULL, -1);
proto = strtok_r(NULL, "/", &save);
if (!proto) respond(NULL, -1);
if (strcmp(proto, "udp") == 0) {
port_s = strtok_r(NULL, "/", &save);
if (port_s) {
uint16_t port = strtol(port_s, NULL, 0);
h = malloc(sizeof *h);
memset(h, 0, sizeof *h);
h->type = H_UDP;
h->udp.c = udpc_new((struct udp){
.dst = port,
.ip.dst = dstip,
}, udp_recv_callback, h);
if (h->udp.c) {
respond(h, 0);
} else {
free(h);
respond(NULL, -1);
}
}
}
}
respond(NULL, -1);
#undef respond
}
void fs_thread(void *arg) { (void)arg;
const size_t buflen = 4096;
char *buf = malloc(buflen);
for (;;) {
struct fs_wait_response res;
handle_t reqh = _syscall_fs_wait(buf, buflen, &res);
if (reqh < 0) break;
struct handle *h = res.id;
long ret;
switch (res.op) {
case VFSOP_OPEN:
if (res.len < buflen) {
buf[res.len] = '\0';
fs_open(reqh, buf);
} else {
_syscall_fs_respond(reqh, NULL, -1, 0);
}
break;
case VFSOP_READ:
switch (h->type) {
case H_ETHER: {
struct ethq *qe;
qe = malloc(sizeof *qe);
qe->h = reqh;
qe->next = ether_queue;
ether_queue = qe;
break;}
case H_UDP:
udp_recv_enqueue(h, reqh);
break;
case H_ARP:
arp_fsread(reqh, res.offset);
break;
default:
_syscall_fs_respond(reqh, NULL, -1, 0);
}
break;
case VFSOP_WRITE:
switch (h->type) {
case H_ETHER:
ret = _syscall_write(state.raw_h, buf, res.len, 0, 0);
_syscall_fs_respond(reqh, NULL, ret, 0);
break;
case H_UDP:
udpc_send(h->udp.c, buf, res.len);
_syscall_fs_respond(reqh, NULL, res.len, 0);
break;
default:
_syscall_fs_respond(reqh, NULL, -1, 0);
}
break;
case VFSOP_CLOSE:
// TODO remove entries in queue
// TODO why does close even have _syscall_fs_respond?
if (h->type == H_UDP)
udpc_close(h->udp.c);
free(h);
_syscall_fs_respond(reqh, NULL, -1, 0);
break;
default:
_syscall_fs_respond(reqh, NULL, -1, 0);
break;
}
}
free(buf);
}
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