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/* Asterisk Manager Proxy
Copyright (c) 2005 David C. Troy <dave@popvox.com>
This program is free software, distributed under the terms of
the GNU General Public License.
HTTP Input Handler
*/
#include "astmanproxy.h"
// SwapChar: This routine swaps one character for another
void SwapChar(char * pOriginal, char cBad, char cGood) {
int i; // generic counter variable
// Loop through the input string (cOriginal), character by
// character, replacing each instance of cBad with cGood
i = 0;
while (pOriginal[i]) {
if (pOriginal[i] == cBad) pOriginal[i] = cGood;
i++;
}
}
// IntFromHex: A subroutine to unescape escaped characters.
static int IntFromHex(char *pChars) {
int Hi; // holds high byte
int Lo; // holds low byte
int Result; // holds result
// Get the value of the first byte to Hi
Hi = pChars[0];
if ('0' <= Hi && Hi <= '9') {
Hi -= '0';
} else
if ('a' <= Hi && Hi <= 'f') {
Hi -= ('a'-10);
} else
if ('A' <= Hi && Hi <= 'F') {
Hi -= ('A'-10);
}
// Get the value of the second byte to Lo
Lo = pChars[1];
if ('0' <= Lo && Lo <= '9') {
Lo -= '0';
} else
if ('a' <= Lo && Lo <= 'f') {
Lo -= ('a'-10);
} else
if ('A' <= Lo && Lo <= 'F') {
Lo -= ('A'-10);
}
Result = Lo + (16 * Hi);
return (Result);
}
// URLDecode: This routine loops through the string pEncoded
// (passed as a parameter), and decodes it in place. It checks for
// escaped values, and changes all plus signs to spaces. The result
// is a normalized string. It calls the two subroutines directly
// above in this listing, IntFromHex() and SwapChar().
void URLDecode(unsigned char *pEncoded) {
char *pDecoded; // generic pointer
// First, change those pesky plusses to spaces
SwapChar (pEncoded, '+', ' ');
// Now, loop through looking for escapes
pDecoded = pEncoded;
while (*pEncoded) {
if (*pEncoded=='%') {
// A percent sign followed by two hex digits means
// that the digits represent an escaped character. We
// must decode it.
pEncoded++;
if (isxdigit(pEncoded[0]) && isxdigit(pEncoded[1])) {
*pDecoded++ = (char) IntFromHex(pEncoded);
pEncoded += 2;
}
} else {
*pDecoded ++ = *pEncoded++;
}
}
*pDecoded = '\0';
}
int ParseHTTPInput(char *buf, struct message *m) {
char *n, *v;
n = buf;
while ( (v = strstr(n, "=")) ) {
v += 1;
debugmsg("n: %s, v: %s", n, v);
strncat(m->headers[m->hdrcount], n, v-n-1);
strcat(m->headers[m->hdrcount], ": ");
if ( (n = strstr(v, "&")) ) {
n += 1;
} else {
n = (v + strlen(v) + 1);
}
strncat(m->headers[m->hdrcount], v, n-v-1);
debugmsg("got hdr: %s", m->headers[m->hdrcount]);
m->hdrcount++;
}
return (m->hdrcount > 0);
}
int HTTPHeader(struct mansession *s, char *status) {
time_t t;
struct tm tm;
char date[80];
char ctype[15], hdr[MAX_LEN];
time(&t);
localtime_r(&t, &tm);
strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %z", &tm);
if ( !strcasecmp("xml", s->output->formatname) )
sprintf(ctype, "text/xml");
else
sprintf(ctype, "text/plain");
if (!strcmp("200 OK", status) )
sprintf(hdr,
"HTTP/1.1 %s\r\n"
"Date: %s\r\n"
"Content-Type: %s\r\n"
"Connection: close\r\n"
"Server: %s/%s\r\n\r\n", status,
date, ctype, PROXY_BANNER, PROXY_VERSION);
else
sprintf(hdr,
"HTTP/1.1 %s\r\n"
"Date: %s\r\n"
"Status: %s\r\n"
"Server: %s/%s\r\n\r\n", status, date, status, PROXY_BANNER, PROXY_VERSION);
pthread_mutex_lock(&s->lock);
s->inputcomplete = 1;
ast_carefulwrite(s->fd, hdr, strlen(hdr), s->writetimeout);
pthread_mutex_unlock(&s->lock);
debugmsg("http header: %s", hdr);
return 0;
}
int _read(struct mansession *s, struct message *m) {
/* Note: No single line may be longer than MAX_LEN/s->inbuf, as per get_input */
/* No HTTP Input may be longer than BUFSIZE */
char line[MAX_LEN], method[10], formdata[MAX_LEN], status[15];
int res, clength = 0;
memset(method, 0, sizeof method);
memset(formdata, 0, sizeof formdata);
memset(status, 0, sizeof status);
/* for http, don't do get_input forever */
for (;;) {
if (s->inputcomplete && !s->outputcomplete)
continue;
else if (s->inputcomplete && s->outputcomplete)
return -1;
memset(line, 0, sizeof line);
res = get_input(s, line);
debugmsg("res=%d, line: %s",res, line);
if (res > 0) {
debugmsg("Got http: %s", line);
if ( !clength && !strncasecmp(line, "Content-Length: ", 16) )
clength = atoi(line+16);
if (!*method) {
if ( !strncmp(line,"POST",4) ) {
strncpy(method, line, 4);
} else if ( !strncmp(line,"GET",3)) {
if ( strlen(line) > 14 ) {
/* GET / HTTP/1.1 ---- this is bad */
/* GET /?Action=Ping&ActionID=Foo HTTP/1.1 */
strncpy(method, line, 3);
memcpy(formdata, line+6, strstr(line, " HTTP")-line-6);
sprintf(status, "200 OK");
} else
sprintf(status, "501 Not Implemented");
}
}
} else if (res == 0) {
/* x-www-form-urlencoded handler */
/* Content-Type: application/x-www-form-urlencoded */
if (*method && !*formdata) {
if ( !strcasecmp(method, "POST") && clength && s->inlen==clength) {
pthread_mutex_lock(&s->lock);
strncpy(formdata, s->inbuf, clength);
s->inlen = 0;
pthread_mutex_unlock(&s->lock);
sprintf(status, "200 OK");
}
}
}
if (res < 0)
break;
if (*status) {
HTTPHeader(s, status);
/* now, let's transform and copy into a standard message block */
if (!strcmp("200 OK", status) ) {
URLDecode(formdata);
res = ParseHTTPInput(formdata, m);
return res;
} else {
pthread_mutex_lock(&s->lock);
s->outputcomplete = 1;
pthread_mutex_unlock(&s->lock);
return 0;
}
}
}
return -1;
}
/* We do not define a _write or _onconnect method */
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