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#include <u.h>
#include <libc.h>
#include <bin.h>
#include <httpd.h>
typedef struct Strings Strings;
struct Strings
{
char *s1;
char *s2;
};
static char* abspath(HConnect *cc, char *origpath, char *curdir);
static int getc(HConnect*);
static char* getword(HConnect*);
static Strings parseuri(HConnect *c, char*);
static Strings stripsearch(char*);
/*
* parse the next request line
* returns:
* 1 ok
* 0 eof
* -1 error
*/
int
hparsereq(HConnect *c, int timeout)
{
Strings ss;
char *vs, *v, *search, *uri, *origuri, *extra;
if(c->bin != nil){
hfail(c, HInternal);
return -1;
}
/*
* serve requests until a magic request.
* later requests have to come quickly.
* only works for http/1.1 or later.
*/
if(timeout)
alarm(timeout);
if(hgethead(c, 0) < 0)
return -1;
if(timeout)
alarm(0);
c->reqtime = time(nil);
c->req.meth = getword(c);
if(c->req.meth == nil){
hfail(c, HSyntax);
return -1;
}
uri = getword(c);
if(uri == nil || strlen(uri) == 0){
hfail(c, HSyntax);
return -1;
}
v = getword(c);
if(v == nil){
if(strcmp(c->req.meth, "GET") != 0){
hfail(c, HUnimp, c->req.meth);
return -1;
}
c->req.vermaj = 0;
c->req.vermin = 9;
}else{
vs = v;
if(strncmp(vs, "HTTP/", 5) != 0){
hfail(c, HUnkVers, vs);
return -1;
}
vs += 5;
c->req.vermaj = strtoul(vs, &vs, 10);
if(*vs != '.' || c->req.vermaj != 1){
hfail(c, HUnkVers, vs);
return -1;
}
vs++;
c->req.vermin = strtoul(vs, &vs, 10);
if(*vs != '\0'){
hfail(c, HUnkVers, vs);
return -1;
}
extra = getword(c);
if(extra != nil){
hfail(c, HSyntax);
return -1;
}
}
/*
* the fragment is not supposed to be sent
* strip it 'cause some clients send it
*/
origuri = uri;
uri = strchr(origuri, '#');
if(uri != nil)
*uri = 0;
/*
* http/1.1 requires the server to accept absolute
* or relative uri's. convert to relative with an absolute path
*/
if(http11(c)){
ss = parseuri(c, origuri);
uri = ss.s1;
c->req.urihost = ss.s2;
if(uri == nil){
hfail(c, HBadReq, uri);
return -1;
}
origuri = uri;
}
/*
* munge uri for search, protection, and magic
*/
ss = stripsearch(origuri);
origuri = ss.s1;
search = ss.s2;
uri = hurlunesc(c, origuri);
uri = abspath(c, uri, "/");
if(uri == nil || uri[0] == '\0'){
hfail(c, HNotFound, "no object specified");
return -1;
}
c->req.uri = uri;
c->req.search = search;
return 1;
}
static Strings
parseuri(HConnect *c, char *uri)
{
Strings ss;
char *urihost, *p;
urihost = nil;
if(uri[0] != '/'){
if(cistrncmp(uri, "http://", 7) != 0){
ss.s1 = nil;
ss.s2 = nil;
return ss;
}
uri += 5; /* skip http: */
}
/*
* anything starting with // is a host name or number
* hostnames constists of letters, digits, - and .
* for now, just ignore any port given
*/
if(uri[0] == '/' && uri[1] == '/'){
urihost = uri + 2;
p = strchr(urihost, '/');
if(p == nil)
uri = hstrdup(c, "/");
else{
uri = hstrdup(c, p);
*p = '\0';
}
p = strchr(urihost, ':');
if(p != nil)
*p = '\0';
}
if(uri[0] != '/' || uri[1] == '/'){
ss.s1 = nil;
ss.s2 = nil;
return ss;
}
ss.s1 = uri;
ss.s2 = hlower(urihost);
return ss;
}
static Strings
stripsearch(char *uri)
{
Strings ss;
char *search;
search = strchr(uri, '?');
if(search != nil)
*search++ = 0;
ss.s1 = uri;
ss.s2 = search;
return ss;
}
/*
* to circumscribe the accessible files we have to eliminate ..'s
* and resolve all names from the root.
*/
static char*
abspath(HConnect *cc, char *origpath, char *curdir)
{
char *p, *sp, *path, *work, *rpath;
int len, n, c;
if(curdir == nil)
curdir = "/";
if(origpath == nil)
origpath = "";
work = hstrdup(cc, origpath);
path = work;
/*
* remove any really special characters
*/
for(sp = "`;| "; *sp; sp++){
p = strchr(path, *sp);
if(p)
*p = 0;
}
len = strlen(curdir) + strlen(path) + 2 + UTFmax;
if(len < 10)
len = 10;
rpath = halloc(cc, len);
if(*path == '/')
rpath[0] = 0;
else
strcpy(rpath, curdir);
n = strlen(rpath);
while(path){
p = strchr(path, '/');
if(p)
*p++ = 0;
if(strcmp(path, "..") == 0){
while(n > 1){
n--;
c = rpath[n];
rpath[n] = 0;
if(c == '/')
break;
}
}else if(strcmp(path, ".") == 0){
;
}else if(n == 1)
n += snprint(rpath+n, len-n, "%s", path);
else
n += snprint(rpath+n, len-n, "/%s", path);
path = p;
}
if(strncmp(rpath, "/bin/", 5) == 0)
strcpy(rpath, "/");
return rpath;
}
static char*
getword(HConnect *c)
{
char *buf;
int ch, n;
while((ch = getc(c)) == ' ' || ch == '\t' || ch == '\r')
;
if(ch == '\n')
return nil;
n = 0;
buf = halloc(c, 1);
for(;;){
switch(ch){
case ' ':
case '\t':
case '\r':
case '\n':
buf[n] = '\0';
return hstrdup(c, buf);
}
if(n < HMaxWord-1){
buf = bingrow(&c->bin, buf, n, n + 1, 0);
if(buf == nil)
return nil;
buf[n++] = ch;
}
ch = getc(c);
}
}
static int
getc(HConnect *c)
{
if(c->hpos < c->hstop)
return *c->hpos++;
return '\n';
}
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