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|
/*
This file is part of harvid
Copyright (C) 2002,2003,2008-2014 Robin Gareus <robin@gareus.org>
This file contains GPL code from mini-http, micro-http and libcurl.
by Jef Poskanzer <jef@mail.acme.com> and
Daniel Stenberg, <daniel@haxx.se>.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <stdint.h>
#include <dlog.h>
#include "socket_server.h"
#include "httprotocol.h"
#include "htmlconst.h"
#include "ics_handler.h"
/* -=-=-=-=-=-=-=-=-=-=- HTTP helper functions */
const char * send_http_status_fd (int fd, int status) {
char http_head[128];
const char *title;
switch (status) {
case 200: title = "OK"; break;
//case 302: title = "Found"; break;
//case 304: title = "Not Modified"; break;
case 400: title = "Bad Request"; break;
//case 401: title = "Unauthorized"; break;
case 403: title = "Forbidden"; break;
case 404: title = "Not Found"; break;
case 415: title = "Unsupported Media Type"; break;
//case 408: title = "Request Timeout"; break;
case 500: title = "Internal Server Error"; break;
case 501: title = "Not Implemented"; break;
case 503: title = "Service Temporarily Unavailable"; break;
default: title = "Internal Server Error"; status = 500; break;
}
snprintf(http_head, sizeof(http_head), "%s %d %s\015\012", PROTOCOL, status, title);
CSEND(fd, http_head);
return title;
}
#define HTHSIZE (1024)
void send_http_header_fd(int fd , int s, httpheader *h) {
char hd[HTHSIZE];
int off = 0;
time_t now;
char timebuf[100];
now = time(NULL);
strftime(timebuf, sizeof(timebuf), RFC1123FMT, gmtime(&now));
off += snprintf(hd+off, HTHSIZE-off, "Date: %s\n", timebuf);
off += snprintf(hd+off, HTHSIZE-off, "Server: %s\r\n", SERVERVERSION);
if (h && h->ctype)
off += snprintf(hd+off, HTHSIZE-off, "Content-type: %s\r\n", h->ctype);
else
off += snprintf(hd+off, HTHSIZE-off, "Content-type: text/html; charset=UTF-8\r\n");
if (h && h->encoding)
off += snprintf(hd+off, HTHSIZE-off, "Content-Encoding: %s\r\n", h->encoding);
if (h && h->extra)
off += snprintf(hd+off, HTHSIZE-off, "%s\r\n", h->extra);
if (h && h->length > 0)
#ifdef HAVE_WINDOWS
off += snprintf(hd+off, HTHSIZE-off, "Content-Length:%lu\r\n", (unsigned long) h->length);
#else
off += snprintf(hd+off, HTHSIZE-off, "Content-Length:%zu\r\n", h->length);
#endif
if (h && h->retryafter)
off += snprintf(hd+off, HTHSIZE-off, "Retry-After:%s\r\n", h->retryafter);
else if (s == 503)
off += snprintf(hd+off, HTHSIZE-off, "Retry-After:5\r\n");
if (h && h->mtime) {
strftime(timebuf, sizeof(timebuf), RFC1123FMT, gmtime(&h->mtime));
off += snprintf(hd+off, HTHSIZE-off, "Last-Modified: %s\r\n", timebuf);
}
off += snprintf(hd+off, HTHSIZE-off, "Connection: close\r\n");
off += snprintf(hd+off, HTHSIZE-off, "\r\n");
CSEND(fd, hd);
}
void httperror(int fd , int s, const char *title, const char *str) {
char hd[HTHSIZE];
int off = 0;
const char *t = send_http_status_fd(fd, s);
send_http_header_fd(fd, s, NULL);
if (!title) title = t;
off += snprintf(hd+off, HTHSIZE-off, DOCTYPE HTMLOPEN);
off += snprintf(hd+off, HTHSIZE-off, "<title>Error %i %s</title></head>", s, title);
off += snprintf(hd+off, HTHSIZE-off, "<body><h1>%s</h1>", title);
if (str && strlen(str)>0) {
off += snprintf(hd+off, HTHSIZE-off, "<p>%s</p>\r\n", str);
} else {
off += snprintf(hd+off, HTHSIZE-off, "<p>%s</p>\r\n", "Sorry.");
}
off += snprintf(hd+off, HTHSIZE-off, ERRFOOTER);
CSEND(fd, hd);
}
int http_tx(int fd, int s, httpheader *h, size_t len, const uint8_t *buf) {
h->length = len;
send_http_status_fd(fd, s);
send_http_header_fd(fd, s, h);
// select
#define WRITE_TIMEOUT (50) // TODO make configurable
int timeout = WRITE_TIMEOUT;
size_t offset = 0;
while (timeout > 0) {
fd_set rd_set, wr_set;
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 200000;
FD_ZERO(&rd_set);
FD_ZERO(&wr_set);
FD_SET(fd, &wr_set);
int ready = select(fd+1, &rd_set, &wr_set, NULL, &tv);
if(ready < 0) return (-1); // error
if(!ready) timeout--;
else {
#ifndef HAVE_WINDOWS
int rv = write(fd, buf+offset, len-offset);
debugmsg(DEBUG_HTTP, " written (%d/%zu) @%zu on fd:%i\n", rv, len-offset, offset, fd);
#else
int rv = send(fd, (const char*) (buf+offset), (size_t) (len-offset), 0);
debugmsg(DEBUG_HTTP, " written (%d/%lu) @%lu on fd:%i\n", rv, (unsigned long)(len-offset), (unsigned long) offset, fd);
#endif
if (rv < 0) {
dlog(DLOG_WARNING, "HTTP: write to socket failed: %s\n", strerror(errno));
break; // TODO: don't break on EAGAIN, ENOBUFS, ENOMEM or similar
} else if (rv != len-offset) {
dlog(DLOG_WARNING, "HTTP: short-write (%u/%u) @%u on fd:%i\n", rv, len-offset, offset, fd);
timeout = WRITE_TIMEOUT;
offset += rv;
} else {
offset += rv;
break;
}
}
}
if (!timeout)
dlog(DLOG_ERR, "HTTP: write timeout fd:%i\n", fd);
if (offset != len) {
dlog(DLOG_WARNING, "HTTP: write to fd:%d failed at (%u/%u) = %.2f%%\n", fd, offset, len, (float)offset*100.0/(float)len);
return (1);
}
return (0);
}
// from libcurl - thanks to GPL and Daniel Stenberg <daniel@haxx.se>
char *url_escape(const char *string, int inlength) {
if (!string) return strdup("");
size_t alloc = (inlength?(size_t)inlength:strlen(string))+1;
char *ns;
char *testing_ptr = NULL;
unsigned char in; /* we need to treat the characters unsigned */
size_t newlen = alloc;
int strindex = 0;
size_t length;
ns = malloc(alloc);
if(!ns) return NULL;
length = alloc-1;
while(length--) {
in = *string;
switch (in) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
ns[strindex++] = in;
break;
default:
newlen += 2; /* the size grows with two, since this'll become a %XX */
if(newlen > alloc) {
alloc *= 2;
testing_ptr = realloc(ns, alloc);
if(!testing_ptr) {
free(ns);
return NULL;
}
else {
ns = testing_ptr;
}
}
snprintf(&ns[strindex], 4, "%%%02X", in);
strindex += 3;
break;
}
string++;
}
ns[strindex] = 0; /* terminate it */
return ns;
}
#include <ctype.h>
#define ISXDIGIT(x) (isxdigit((int) ((unsigned char)x)))
// also adapted from libcurl
char *url_unescape(const char *string, int length, int *olen) {
if (!string) return strdup("");
int alloc = (length?length:(int)strlen(string))+1;
char *ns = malloc(alloc);
unsigned char in;
int strindex = 0;
long hex;
if(!ns) return NULL;
while(--alloc > 0) {
in = *string;
if(('%' == in) && ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
/* this is two hexadecimal digits following a '%' */
char hexstr[3];
char *ptr;
hexstr[0] = string[1];
hexstr[1] = string[2];
hexstr[2] = 0;
hex = strtol(hexstr, &ptr, 16);
in = (unsigned char)hex; /* this long is never bigger than 255 anyway */
string += 2;
alloc -= 2;
}
ns[strindex++] = in;
string++;
}
ns[strindex] = 0; /* terminate it */
/* store output size */
if(olen) *olen = strindex;
return ns;
}
/* -=-=-=-=-=-=-=-=-=-=- protocol handler implementation */
/*
* HTTP protocol handler implements virtual
* int protocol_error(int fd, int status);
*/
void protocol_error(int fd, int status, char *msg) {
httperror(fd, status, "Error", msg?msg:"Unspecified Error.");
}
void protocol_response(int fd, char *msg) {
send_http_status_fd(fd, 200); \
send_http_header_fd(fd, 200, NULL); \
CSEND(fd, msg);
}
/* parse HTTP protocol header */
static char *get_next_line(char **str) {
char *t = *str;
char *xx = strpbrk(t, "\n\r");
if (!xx) return (NULL);
*xx++ = '\0';
while (xx && (*xx == '\r' || *xx == '\n')) xx++;
*str = xx;
return t;
}
/* check accept for image/png[;..] */
static int compare_accept(char *line) {
int rv = 0;
char *tmp;
if ((tmp = strchr(line, ';'))) *tmp = '\0'; // ignore opt. parameters
if (!strncmp(line, "image/", 6)) {
rv |= 1;
debugmsg(DEBUG_HTTP, "HTTP: accept image: %s\n", line);
} else if (!strcmp(line, "*/*")) {
rv |= 2;
debugmsg(DEBUG_HTTP, "HTTP: accept all: %s\n", line);
}
if (tmp) *tmp = ';';
return rv;
}
/*
* HTTP protocol handler implements virtual
* int protocol_handler(fd_set rd_set, CONN *c);
* for: HTTP & ics-query
*/
int protocol_handler(CONN *c, void *unused) {
#ifndef HAVE_WINDOWS
int num = read(c->fd, c->buf, BUFSIZ);
#else
int num = recv(c->fd, c->buf, BUFSIZ, 0);
#endif
if (num < 0 && (errno == EINTR || errno == EAGAIN)) return(0);
if (num < 0) return(-1);
if (num == 0) return(-1); // end of input
c->buf[num] = '\0';
#if 0 // non HTTP commands - security issue
if (!strncmp(c->buf, "quit", 4)) {c->run = 0; return(0);}
else if (!strncmp(c->buf, "shutdown", 8)) { c->d->run = 0; return(0);}
#endif
debugmsg(DEBUG_HTTP, "HTTP: CON raw-input: '%s'\n", c->buf);
char *method_str;
char *path, *protocol, *query;
/* Parse the first line of the request. */
method_str = c->buf;
if (method_str == (char*) 0) {
httperror(c->fd, 400, "Bad Request", "Can't parse request method."); c->run = 0; return(0);
}
path = strpbrk(method_str, " \t\012\015");
if (path == (char*) 0) {
httperror(c->fd, 400, "Bad Request", "Can't parse request path."); c->run = 0; return(0);
}
*path++ = '\0';
path += strspn(path, " \t\012\015");
protocol = strpbrk(path, " \t\012\015");
if (protocol == (char*) 0) {
httperror(c->fd, 400, "Bad Request", "Can't parse request protocol."); c->run = 0; return(0);
}
*protocol++ = '\0';
protocol += strspn(protocol, " \t\012\015");
query = strchr(path, '?');
if (query == (char*) 0)
query = "";
else
*query++ = '\0';
char *header = strpbrk(protocol, "\n\r \t\012\015");
if (!header && strncmp(protocol, "HTTP/0.9", 8)) {
httperror(c->fd, 400, "Bad Request", "Can't parse request header.");
c->run = 0; return(0);
} else if (!header)
header = "";
else {
*header++ = '\0';
while (header && (*header == '\r' || *header == '\n')) header++;
}
#ifdef HAVE_WINDOWS
debugmsg(DEBUG_HTTP, "HTTP: CON header-len: %lu\n", (long unsigned) strlen(header));
#else
debugmsg(DEBUG_HTTP, "HTTP: CON header-len: %zu\n", strlen(header));
#endif
debugmsg(DEBUG_HTTP, "HTTP: CON header: ''%s''\n", header);
char *cookie = NULL, *host = NULL, *referer = NULL, *useragent = NULL;
char *contenttype = NULL, *accept = NULL; long int contentlength = 0;
char *cp, *line;
/* Parse the rest of the request headers. */
while ((line = get_next_line(&header)))
{
if (line[0] == '\0')
break;
else if (strncasecmp(line, "Accept:", 7) == 0)
{
cp = &line[7];
cp += strspn(cp, " \t");
accept = cp;
}
else if (strncasecmp(line, "Cookie:", 7) == 0)
{
cp = &line[7];
cp += strspn(cp, " \t");
cookie = cp;
}
else if (strncasecmp(line, "Host:", 5) == 0)
{
cp = &line[5];
cp += strspn(cp, " \t");
host = cp;
if (strchr(host, '/') != (char*) 0 || host[0] == '.') {
httperror(c->fd, 400, "Bad Request", "Can't parse request.");
c->run = 0; return(0);
}
}
else if (strncasecmp(line, "Referer:", 8) == 0)
{
cp = &line[8];
cp += strspn(cp, " \t");
referer = cp;
}
else if (strncasecmp(line, "User-Agent:", 11) == 0)
{
cp = &line[11];
cp += strspn(cp, " \t");
useragent = cp;
}
else if (strncasecmp(line, "Content-Type:", 13) == 0)
{
cp = &line[13];
cp += strspn(cp, " \t");
contenttype = cp;
}
else if (strncasecmp(line, "Content-Length:", 15) == 0)
{
cp = &line[15];
cp += strspn(cp, " \t");
contentlength = atoll(cp);
}
else
debugmsg(DEBUG_HTTP, "HTTP: CON header not parsed: '%s'\n", line);
}
debugmsg(DEBUG_HTTP, "HTTP: CON header co='%s' ho='%s' re='%s' ua='%s' ac='%s'\n",
cookie, host, referer, useragent, accept);
/* process headers */
int ac = accept?0:-1;
line = accept;
while (line && (cp = strchr(line, ','))) {
*cp = '\0';
ac |= compare_accept(line);
line = cp+1;
}
if (line)
ac |= compare_accept(line);
if (ac == 0) {
httperror(c->fd, 415, "", "Your client does not accept any files that this server can produce.\n");
c->run = 0;
return(0);
}
debugmsg(DEBUG_CON, "HTTP: Proto: '%s', method: '%s', path: '%s' query:'%s'\n", protocol, method_str, path, query);
/* pre-process request */
if (!strcmp("POST", method_str)
&& (contenttype && !strcmp(contenttype, "application/x-www-form-urlencoded"))
&& (contentlength > 0 && contentlength <= strlen(header) /* - (header-c->buf) */ /* -num */)
&& (num < BUFSIZ)
) {
header[contentlength] = '\0';
#ifdef HAVE_WINDOWS
debugmsg(DEBUG_CON, "HTTP: translate POST->GET query - length data:%lu cl:%ld\n", (long unsigned) strlen(header), contentlength);
#else
debugmsg(DEBUG_CON, "HTTP: translate POST->GET query - length data:%zu cl:%ld\n", strlen(header), contentlength);
#endif
debugmsg(DEBUG_CON, "HTTP: x-www-form-urlencoded:'%s'\n", header);
query = header;
method_str = "GET";
}
/* process request */
ics_http_handler(c, host, protocol, path, method_str, query, cookie);
return(0);
}
// vim:sw=2 sts=2 ts=8 et:
|
