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楼主 |
发表于 2011-6-21 21:41:21
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好像判断网页与单片机控制的服务器通信的控制在这里面，但是不太清楚是怎么控制的。谢谢……
void
httpd_appcall(void)
{
struct fs_file fsfile;
u8_t i;
switch(uip_conn->lport) {
/* This is the web server: */
case HTONS(80):
/* Pick out the application state from the uip_conn structure. */
hs = (struct httpd_state *)(uip_conn->appstate);
/* We use the uip_ test functions to deduce why we were
called. If uip_connected() is non-zero, we were called
because a remote host has connected to us. If
uip_newdata() is non-zero, we were called because the
remote host has sent us new data, and if uip_acked() is
non-zero, the remote host has acknowledged the data we
previously sent to it. */
if(uip_connected()) {
/* Since we have just been connected with the remote host, we
reset the state for this connection. The ->count variable
contains the amount of data that is yet to be sent to the
remote host, and the ->state is set to HTTP_NOGET to signal
that we haven't received any HTTP GET request for this
connection yet. */
hs->state = HTTP_NOGET;
hs->count = 0;
return;
} else if(uip_poll()) {
/* If we are polled ten times, we abort the connection. This is
because we don't want connections lingering indefinately in
the system. */
if(hs->count++ >= 10) {
uip_abort();
}
return;
} else if(uip_newdata() && hs->state == HTTP_NOGET) {
/* This is the first data we receive, and it should contain a
GET. */
/* Check for GET. */
if(uip_appdata[0] != ISO_G ||
uip_appdata[1] != ISO_E ||
uip_appdata[2] != ISO_T ||
uip_appdata[3] != ISO_space) {
/* If it isn't a GET, we abort the connection. */
uip_abort();
return;
}
/* Find the file we are looking for. */
for(i = 4; i < 40; ++i) {
if(uip_appdata == ISO_space ||
uip_appdata == ISO_cr ||
uip_appdata == ISO_nl) {
uip_appdata = 0;
break;
}
}
PRINT("request for file ");
PRINTLN(&uip_appdata[4]);
/* Check for a request for "/". */
if(uip_appdata[4] == ISO_slash &&
uip_appdata[5] == 0) {
fs_open(file_index_html->name, &fsfile);
} else {
if(!fs_open((const char *)&uip_appdata[4], &fsfile)) {
PRINTLN("couldn't open file");
fs_open(file_404_html->name, &fsfile);
}
}
if(uip_appdata[4] == ISO_slash &&
uip_appdata[5] == ISO_c &&
uip_appdata[6] == ISO_g &&
uip_appdata[7] == ISO_i &&
uip_appdata[8] == ISO_slash) {
/* If the request is for a file that starts with "/cgi/", we
prepare for invoking a script. */
hs->script = fsfile.dat;
next_scriptstate();
} else {
hs->script = NULL;
/* The web server is now no longer in the HTTP_NOGET state, but
in the HTTP_FILE state since is has now got the GET from
the client and will start transmitting the file. */
hs->state = HTTP_FILE;
/* Point the file pointers in the connection state to point to
the first byte of the file. */
hs->dataptr = fsfile.dat;
hs->count = fsfile.len;
}
}
if(hs->state != HTTP_FUNC) {
/* Check if the client (remote end) has acknowledged any data that
we've previously sent. If so, we move the file pointer further
into the file and send back more data. If we are out of data to
send, we close the connection. */
if(uip_acked()) {
if(hs->count >= uip_conn->len) {
hs->count -= uip_conn->len;
hs->dataptr += uip_conn->len;
} else {
hs->count = 0;
}
if(hs->count == 0) {
if(hs->script != NULL) {
next_scriptline();
next_scriptstate();
} else {
uip_close();
}
}
}
} else {
/* Call the CGI function. */
if(cgitab[hs->script[2] - ISO_a](uip_acked())) {
/* If the function returns non-zero, we jump to the next line
in the script. */
next_scriptline();
next_scriptstate();
}
}
if(hs->state != HTTP_FUNC && !uip_poll()) {
/* Send a piece of data, but not more than the MSS of the
connection. */
uip_send(hs->dataptr, hs->count);
}
/* Finally, return to uIP. Our outgoing packet will soon be on its
way... */
return;
default:
/* Should never happen. */
uip_abort();
break;
}
} |
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发表于 2011-6-21 21:28:48
