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socket_handler.c
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socket_handler.c
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#include "util.h" // _GNU_SOURCE
#include <ctype.h>
#include <fcntl.h>
#include <pthread.h>
#include <poll.h>
#include <sys/stat.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include "socket_handler.h"
#include "certs.h"
#include "logger.h"
// private data for socket_handler() use
static const char httpcors_headers[] =
"Access-Control-Allow-Origin: %s\r\n"
"Access-Control-Allow-Credentials: true\r\n"
"Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept, documentReferer\r\n";
static const char httpnulltext[] =
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/html; charset=UTF-8\r\n"
"Connection: keep-alive\r\n"
"Content-Length: 0\r\n"
"%s" /* optional CORS */
"\r\n";
// HTTP 204 No Content for Google generate_204 URLs
static const char http204[] =
"HTTP/1.1 204 No Content\r\n"
"Content-Length: 0\r\n"
"Content-Type: text/html; charset=UTF-8\r\n"
"\r\n";
// HTML stats response pieces
static const char httpstats1[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: text/html\r\n"
"Content-length: ";
// total content length goes between these two strings
static const char httpstats2[] =
"\r\n"
"Connection: keep-alive\r\n"
"\r\n";
// split here because we care about the length of what follows
static const char httpstats3[] =
"<!DOCTYPE html><html><head><link rel='icon' href='/favicon.ico' type='image/x-icon'/><meta name='viewport' content='width=device-width'><title>pixelserv statistics</title><style>body {font-family:monospace;} table {min-width: 75%; border-collapse: collapse;} th { height:18px; } td {border: 1px solid #e0e0e0; background-color: #f9f9f9;} td:first-child {width: 7%;} td:nth-child(2) {width: 15%; background-color: #ebebeb; border: 1px solid #f9f9f9;}</style></head><body>";
// stats text goes between these two strings
static const char httpstats4[] =
"</body></html>\r\n";
// note: the -2 is to avoid counting the last line ending characters
static const unsigned int statsbaselen = sizeof httpstats3 + sizeof httpstats4 - 2;
// TXT stats response pieces
static const char txtstats1[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: text/plain\r\n"
"Content-length: ";
// total content length goes between these two strings
static const char txtstats2[] =
"\r\n"
"Connection: keep-alive\r\n"
"\r\n";
// split here because we care about the length of what follows
static const char txtstats3[] =
"\r\n";
static const char httpredirect[] =
"HTTP/1.1 307 Temporary Redirect\r\n"
"Location: %s\r\n"
"Content-type: text/plain\r\n"
"Content-length: 0\r\n"
"Connection: keep-alive\r\n"
"%s" /* optional CORS */
"\r\n";
static const char httpnullpixel[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: image/gif\r\n"
"Content-length: 42\r\n"
"Connection: keep-alive\r\n"
"\r\n"
"GIF89a" // header
"\1\0\1\0" // little endian width, height
"\x80" // Global Colour Table flag
"\0" // background colour
"\0" // default pixel aspect ratio
"\1\1\1" // RGB
"\0\0\0" // RBG black
"!\xf9" // Graphical Control Extension
"\4" // 4 byte GCD data follow
"\1" // there is transparent background color
"\0\0" // delay for animation
"\0" // transparent colour
"\0" // end of GCE block
"," // image descriptor
"\0\0\0\0" // NW corner
"\1\0\1\0" // height * width
"\0" // no local color table
"\2" // start of image LZW size
"\1" // 1 byte of LZW encoded image data
"D" // image data
"\0" // end of image data
";"; // GIF file terminator
static const char http501[] =
"HTTP/1.1 501 Method Not Implemented\r\n"
"Connection: keep-alive\r\n"
"\r\n";
static const char httpnull_png[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: image/png\r\n"
"Content-length: 67\r\n"
"Connection: keep-alive\r\n"
"\r\n"
"\x89"
"PNG"
"\r\n"
"\x1a\n" // EOF
"\0\0\0\x0d" // 13 bytes length
"IHDR"
"\0\0\0\1\0\0\0\1" // width x height
"\x08" // bit depth
"\x06" // Truecolour with alpha
"\0\0\0" // compression, filter, interlace
"\x1f\x15\xc4\x89" // CRC
"\0\0\0\x0a" // 10 bytes length
"IDAT"
"\x78\x9c\x63\0\1\0\0\5\0\1"
"\x0d\x0a\x2d\xb4" // CRC
"\0\0\0\0" // 0 length
"IEND"
"\xae\x42\x60\x82"; // CRC
static const char httpnull_jpg[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: image/jpeg\r\n"
"Content-length: 159\r\n"
"Connection: close\r\n"
"\r\n"
"\xff\xd8" // SOI, Start Of Image
"\xff\xe0" // APP0
"\x00\x10" // length of section 16
"JFIF\0"
"\x01\x01" // version 1.1
"\x01" // pixel per inch
"\x00\x48" // horizontal density 72
"\x00\x48" // vertical density 72
"\x00\x00" // size of thumbnail 0 x 0
"\xff\xdb" // DQT
"\x00\x43" // length of section 3+64
"\x00" // 0 QT 8 bit
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xc0" // SOF
"\x00\x0b" // length 11
"\x08\x00\x01\x00\x01\x01\x01\x11\x00"
"\xff\xc4" // DHT Define Huffman Table
"\x00\x14" // length 20
"\x00\x01" // DC table 1
"\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x03"
"\xff\xc4" // DHT
"\x00\x14" // length 20
"\x10\x01" // AC table 1
"\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00"
"\xff\xda" // SOS, Start of Scan
"\x00\x08" // length 8
"\x01" // 1 component
"\x01\x00"
"\x00\x3f\x00" // Ss 0, Se 63, AhAl 0
"\x37" // image
"\xff\xd9"; // EOI, End Of image
static const char httpnull_swf[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: application/x-shockwave-flash\r\n"
"Content-length: 25\r\n"
"Connection: keep-alive\r\n"
"\r\n"
"FWS"
"\x05" // File version
"\x19\x00\x00\x00" // litle endian size 16+9=25
"\x30\x0A\x00\xA0" // Frame size 1 x 1
"\x00\x01" // frame rate 1 fps
"\x01\x00" // 1 frame
"\x43\x02" // tag type is 9 = SetBackgroundColor block 3 bytes long
"\x00\x00\x00" // black
"\x40\x00" // tag type 1 = show frame
"\x00\x00"; // tag type 0 - end file
static const char httpnull_ico[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: image/x-icon\r\n"
"Cache-Control: max-age=2592000\r\n"
"Content-length: 70\r\n"
"Connection: keep-alive\r\n"
"\r\n"
"\x00\x00" // reserved 0
"\x01\x00" // ico
"\x01\x00" // 1 image
"\x01\x01\x00" // 1 x 1 x >8bpp colour
"\x00" // reserved 0
"\x01\x00" // 1 colour plane
"\x20\x00" // 32 bits per pixel
"\x30\x00\x00\x00" // size 48 bytes
"\x16\x00\x00\x00" // start of image 22 bytes in
"\x28\x00\x00\x00" // size of DIB header 40 bytes
"\x01\x00\x00\x00" // width
"\x02\x00\x00\x00" // height
"\x01\x00" // colour planes
"\x20\x00" // bits per pixel
"\x00\x00\x00\x00" // no compression
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00" // end of header
"\x00\x00\x00\x00" // Colour table
"\x00\x00\x00\x00" // XOR B G R
"\x80\xF8\x9C\x41"; // AND ?
static const char httpoptions[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: text/html\r\n"
"Content-length: 11\r\n"
"Allow: GET,OPTIONS\r\n"
"Connection: keep-alive\r\n"
"\r\n"
"GET,OPTIONS";
static const char httpcacert[] =
"HTTP/1.1 200 OK\r\n"
"Content-Type: application/x-x509-ca-cert\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: ";
static const char httpcacert2[] =
"\r\n"
"\r\n";
static const char httpfilenotfound[] =
"HTTP/1.1 404 Not Found\r\n"
"Content-Type: text/plain\r\n"
"Content-Length: 15\r\n"
"\r\n"
"404 - Not Found";
static const char favicon_ico[] =
"HTTP/1.1 200 OK\r\n"
"Content-type: image/x-icon\r\n"
"Content-length: 598\r\n"
"Connection: keep-alive\r\n"
"\r\n"
"\x00\x00" // reserved 0
"\x01\x00" // ico
"\x01\x00" // 1 image
"\x10\x10\x00" // 16 x 16 x >8bpp colour
"\x00" // reserved 0
"\x01\x00" // 1 colour plane
"\x20\x00" // 32 bits per pixel
"\x40\x02\x00\x00" // size 576 bytes
"\x16\x00\x00\x00" // start of image 22 bytes in
"\x89\x50\x4e\x47\x0d\x0a\x1a\x0a\x00\x00\x00\x0d\x49\x48\x44\x52"
"\x00\x00\x00\x10\x00\x00\x00\x10\x08\x06\x00\x00\x00\x1f\xf3\xff"
"\x61\x00\x00\x00\x06\x62\x4b\x47\x44\x00\xff\x00\xff\x00\xff\xa0"
"\xbd\xa7\x93\x00\x00\x01\xf5\x49\x44\x41\x54\x38\xcb\x95\x91\x4b"
"\x6b\x13\x51\x18\x86\x9f\x33\x33\x49\x26\x17\xab\x81\x6a\x89\x69"
"\x24\x44\xac\x48\x2b\x54\x2a\x12\xd1\x08\x25\xb8\xd1\xae\xf4\x3f"
"\x8a\x60\x41\x2b\x55\x90\xaa\x50\x5d\xc4\x45\x29\xb6\xa6\x41\x6d"
"\x6a\x8b\x6d\xed\x18\x72\x31\x97\x69\x3a\xc9\xcc\x1c\x17\x2d\x85"
"\x49\xc6\x85\x67\xf3\xc1\xe1\x7d\x9f\xf7\xbb\x88\xcd\xed\x9a\x7c"
"\xff\x71\x0b\xf3\xb0\xc7\xff\xbc\x48\x38\x48\x3e\x97\x41\x7b\xb5"
"\xf4\x8d\xc2\xca\xcf\x21\x81\x94\x00\x12\x10\xa7\x55\x08\xaf\xa6"
"\xd7\xb3\xd1\x3a\xe6\x70\xb2\xaa\x2a\x8c\x27\x46\x48\xa7\xce\x11"
"\x8d\x04\xd9\x37\x5a\x6c\xed\xd4\x19\xd4\x9a\xdd\x3e\xda\x20\x55"
"\x55\x15\x6e\xcf\xa4\x98\xbb\x7f\x95\x78\x3c\x8c\x6d\xbb\x28\x8a"
"\xe0\x73\xf1\x80\xf9\xc5\x0d\xaa\x35\x13\x71\x62\x12\x80\x36\xd8"
"\x76\xe6\x52\x9c\x47\x73\x93\xd4\x6a\x26\x4f\x9e\xaf\x63\x59\x36"
"\xd9\x99\x14\xb9\x6c\x9a\x46\xf3\x88\x67\x2f\x8b\xc8\xe3\xf9\x60"
"\x10\xa0\x28\x30\x75\x6d\x0c\x3d\xa4\xb2\xf0\xe6\x2b\x6b\x25\x03"
"\x80\x4a\xd5\x64\xec\x7c\x8c\x99\xeb\x17\x59\x5a\x2e\x53\x6f\x1c"
"\x9e\x76\xa1\x78\x01\x0a\xb1\x48\x10\xcb\x72\xf8\xd3\xec\x22\x00"
"\x55\x11\xb4\x4d\x8b\x56\xc7\x42\x55\x05\x7a\xc8\x93\xe9\x05\x38"
"\x8e\x4b\xa5\x66\x12\x0a\xa9\x5c\xc9\x8c\x22\x04\xb8\xae\x24\x99"
"\x18\x21\x9d\x8a\x63\x54\x3a\xb4\x3a\xd6\xc9\xf4\x3e\x23\x48\x29"
"\x59\x2f\x19\xcc\xde\xc9\x70\x73\x3a\x49\x79\xa7\xc6\x44\x66\x94"
"\x7c\xee\x32\x91\x70\x80\xe5\xc2\x36\xa6\xd9\xf3\x9c\xd3\x03\x10"
"\x42\x60\x54\xda\xac\xae\xef\x73\x2f\x9b\xe6\xf1\xc3\x49\x52\xc9"
"\xb3\x1c\xfc\x6e\x33\xbf\x58\x64\x6d\xc3\x18\x3a\xb9\x36\xf8\xe1"
"\x38\x92\x4f\xab\x7b\xdc\xba\x31\xce\x99\x58\x88\xa7\x2f\xbe\xb0"
"\xf9\xa3\x4a\xb3\x65\x79\xb6\xef\xbb\x83\xe3\x45\x0a\xf6\x7e\x35"
"\x59\x2b\x19\x5c\x18\x8d\x22\x5d\x49\xbd\xd1\xf5\x35\xfb\x02\x00"
"\x6c\xdb\xa5\xb0\xb2\x8b\xe3\x48\xa6\xa7\x12\xe8\xba\x86\xbf\x1d"
"\x34\x3f\xb0\xa2\x08\x76\x76\x1b\xbc\x7e\xf7\x1d\xcb\xea\xe3\xba"
"\x12\xe1\x63\x96\x80\x16\x8b\x06\x7d\xc9\xb6\xed\xf2\xf6\x43\x19"
"\xd7\xfd\x57\x36\x44\xf4\x00\xda\x83\xfc\x04\x7a\x48\xa3\x7b\xd4"
"\xf7\x8f\x10\xfe\xe6\xb0\x1e\x60\xf6\x6e\x86\xbf\x92\xfc\xd0\x99"
"\x74\x8d\x76\xe7\x00\x00\x00\x00\x49\x45\x4e\x44\xae\x42\x60\x82";
// private functions for socket_handler() use
#ifdef HEX_DUMP
// from http://sws.dett.de/mini/hexdump-c/
static void hex_dump(void *data, int size)
{
/* dumps size bytes of *data to stdout. Looks like:
* [0000] 75 6E 6B 6E 6F 77 6E 20 30 FF 00 00 00 00 39 00 unknown 0.....9.
* (in a single line of course)
*/
char *p = data;
char c;
int n;
char bytestr[4] = {0};
char addrstr[10] = {0};
char hexstr[16*3 + 5] = {0};
char charstr[16*1 + 5] = {0};
for (n = 1; n <= size; n++) {
if (n%16 == 1) {
// store address for this line
snprintf(addrstr, sizeof addrstr, "%.4x",
((unsigned int)p-(unsigned int)data) );
}
c = *p;
if (isprint(c) == 0) {
c = '.';
}
// store hex str (for left side)
snprintf(bytestr, sizeof bytestr, "%02X ", *p);
strncat(hexstr, bytestr, sizeof hexstr - strlen(hexstr) - 1);
// store char str (for right side)
snprintf(bytestr, sizeof bytestr, "%c", c);
strncat(charstr, bytestr, sizeof charstr - strlen(charstr) - 1);
if (n%16 == 0) {
// line completed
printf("[%4.4s] %-50.50s %s\n", addrstr, hexstr, charstr);
hexstr[0] = 0;
charstr[0] = 0;
} else if (n%8 == 0) {
// half line: add whitespaces
strncat(hexstr, " ", sizeof hexstr - strlen(hexstr) - 1);
strncat(charstr, " ", sizeof charstr - strlen(charstr) - 1);
}
p++; // next byte
}
if (strlen(hexstr) > 0) {
// print rest of buffer if not empty
printf("[%4.4s] %-50.50s %s\n", addrstr, hexstr, charstr);
}
}
#endif // HEX_DUMP
// redirect utility functions
char* strstr_last(const char* const str1, const char* const str2) {
char *strp;
int len1, len2;
len2 = strlen(str2);
if (len2==0) {
return (char *) str1;
}
len1 = strlen(str1);
if (len1 - len2 <= 0) {
return 0;
}
strp = (char *)(str1 + len1 - len2);
while (strp != str1) {
if (*strp == *str2 && strncmp(strp, str2, len2) == 0) {
return strp;
}
strp--;
}
return 0;
}
/* strstr behavior undefined if one or more parameter is null.
Not portable as MacOS default to crash. */
char* strstr_first(const char* const str1, const char* const str2) {
if (!str1) return NULL;
if (!str2) return (char*)str1;
return strstr(str1, str2);
}
char from_hex(const char ch) {
return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10;
}
void urldecode(char* const decoded, char* const encoded) {
char* pstr = encoded;
char* pbuf = decoded;
while (*pstr) {
if (*pstr == '%') {
if (pstr[1] && pstr[2]) {
*pbuf++ = from_hex(pstr[1]) << 4 | from_hex(pstr[2]);
pstr += 2;
}
} else {
*pbuf++ = *pstr;
}
pstr++;
}
*pbuf = '\0';
}
#ifdef DEBUG
void child_signal_handler(int sig)
{
if (sig != SIGTERM
&& sig != SIGUSR2) {
log_msg(LGG_DEBUG, "Thread or child process ignoring unsupported signal number: %d", sig);
return;
}
if (sig == SIGTERM) {
// Ignore this signal while we are quitting
signal(SIGTERM, SIG_IGN);
}
log_msg(LGG_DEBUG, "Thread or child process caught signal %d file %s", sig, __FILE__);
if (sig == SIGTERM) {
// exit program on SIGTERM
log_msg(LGG_DEBUG, "Thread or child process exit on SIGTERM");
exit(EXIT_SUCCESS);
}
return;
}
#define TIME_CHECK(x) {\
if (do_warning) {\
do_warning = 0;\
double time_msec = 0.0;\
time_msec = elapsed_time_msec(start_time);\
if (time_msec > warning_time) {\
log_msg(LGG_DEBUG, "Elapsed time %f msec exceeded warning_time=%d msec following operation: %s", time_msec, warning_time, x);\
}\
}\
}
#define ELAPSED_TIME(op) {\
double time_msec = 0.0;\
time_msec = elapsed_time_msec(start_time);\
log_msg(LGG_DEBUG, "Elapsed time %f msec following operation: %s", time_msec, op);\
}
#else
#define TIME_CHECK(x,y...)
#define ELAPSED_TIME(x,y...)
#endif //DEBUG
extern struct Global *g;
static struct timespec start_time = {0, 0};
static int peek_socket(int fd, SSL *ssl) {
char buf[10];
int rv = -1;
if (!ssl)
rv = recv(fd, buf, 10, MSG_PEEK);
else
rv = SSL_peek(ssl, buf, 10);
TESTPRINT("%s rv:%d\n", __FUNCTION__, rv);
return rv;
}
static int ssl_read(SSL *ssl, char *buf, int len) {
int ssl_attempt = 1, ret;
redo_ssl_read:
ERR_clear_error();
ret = SSL_read(ssl, (char *)buf, len);
if (ret <= 0) {
int sslerr = SSL_get_error(ssl, ret);
//log_msg(LGG_CRIT, "%s: ret:%d ssl error:%d", __FUNCTION__, ret, sslerr);
switch(sslerr) {
case SSL_ERROR_WANT_READ:
ssl_attempt--;
if (ssl_attempt > 0) goto redo_ssl_read;
break;
case SSL_ERROR_SSL:
//log_msg(LGG_CRIT, "%s: ssl error %d", __FUNCTION__, ERR_peek_last_error());
break;
case SSL_ERROR_SYSCALL:
//log_msg(LGG_CRIT, "%s: errno:%d", __FUNCTION__, errno);
default:
;
}
}
return ret;
}
static int read_socket(int fd, char **msg, SSL *ssl, char *early_data)
{
if (early_data) {
log_msg(LGG_DEBUG, "%s: early data\n", __FUNCTION__);
*msg = early_data;
return strlen(early_data);
}
*msg = realloc(*msg, CHAR_BUF_SIZE + 1);
if (!(*msg)) {
log_msg(LGG_ERR, "Out of memory. Cannot malloc receiver buffer.");
return -1;
}
int i, rv, msg_len = 0;
char *bufptr = *msg;
for (i=1; i<=MAX_CHAR_BUF_LOTS;) { /* 128K max with CHAR_BUF_SIZE == 4K */
if (!ssl)
rv = recv(fd, bufptr, CHAR_BUF_SIZE, 0);
else
rv = ssl_read(ssl, (char *)bufptr, CHAR_BUF_SIZE);
msg_len += rv;
if (rv < CHAR_BUF_SIZE)
break;
else {
++i;
if (!(*msg = realloc(*msg, CHAR_BUF_SIZE * i + 1))) {
log_msg(LGG_ERR, "Out of memory. Cannot realloc receiver buffer. Size: %d", CHAR_BUF_SIZE * i);
return -1; /* start processing with whatever we received already */
}
log_msg(LGG_DEBUG, "Realloc receiver buffer. Size: %d", CHAR_BUF_SIZE * i);
bufptr = *msg + CHAR_BUF_SIZE * (i - 1);
}
}
TESTPRINT("%s: fd:%d msg_len:%d ssl:%p\n", __FUNCTION__, fd, msg_len, ssl);
return msg_len;
}
static int ssl_write(SSL *ssl, const char *buf, int len) {
int ssl_attempt = 1, ret;
redo_ssl_write:
ERR_clear_error();
ret = SSL_write(ssl, (char *)buf, len);
if (ret <= 0) {
int sslerr = SSL_get_error(ssl, ret);
//log_msg(LGG_CRIT, "%s: ret:%d ssl error:%d", __FUNCTION__, ret, sslerr);
switch(sslerr) {
case SSL_ERROR_WANT_WRITE:
ssl_attempt--;
if (ssl_attempt > 0) goto redo_ssl_write;
break;
case SSL_ERROR_SSL:
//log_msg(LGG_CRIT, "%s: ssl error %d", __FUNCTION__, ERR_peek_last_error());
break;
case SSL_ERROR_SYSCALL:
//log_msg(LGG_CRIT, "%s: errno:%d", __FUNCTION__, errno);
default:
;
}
}
return ret;
}
static int write_socket(int fd, const char *msg, int msg_len, SSL *ssl, char **early_data)
{
int rv;
if (ssl) {
#ifdef TLS1_3_VERSION
if (*early_data) {
log_msg(LGG_DEBUG, "%s: early data\n", __FUNCTION__);
SSL_write_early_data(ssl, msg, msg_len, (size_t*)&rv);
/* finish the handshake. assume it'll simply succeed */
SSL_accept(ssl);
/* job done. reset to NULL.
memory freed when 'buf' in conn_hanlder freed */
*early_data = NULL;
} else
#endif
rv = ssl_write(ssl, msg, msg_len);
} else {
/* a blocking call, so zero should not be returned */
rv = send(fd, msg, msg_len, 0);
}
return rv;
}
static int write_pipe(int fd, response_struct *pipedata) {
// note that the parent must not perform a blocking pipe read without checking
// for available data, or else it may deadlock when we don't write anything
int rv = write(fd, pipedata, sizeof(*pipedata));
if (rv < 0) {
log_msg(LGG_ERR, "write() to pipe reported error: %m");
} else if (rv == 0) {
log_msg(LGG_ERR, "write() to pipe reported no data written and no error");
} else if (rv != sizeof(*pipedata)) {
log_msg(LGG_ERR, "write() to pipe reported writing only %d bytes of expected %u",
rv, (unsigned int)sizeof(*pipedata));
}
return rv;
}
void get_client_ip(int socket_fd, char *ip, int ip_len, char *port, int port_len)
{
struct sockaddr_storage sin_addr;
socklen_t sin_addr_len = sizeof(sin_addr);
if (ip == NULL || ip_len <= 0 || (socket_fd < 0 && (ip[0] = '\0') == '\0'))
return;
if (!getpeername(socket_fd, (struct sockaddr*)&sin_addr, &sin_addr_len) &&
getnameinfo((struct sockaddr *)&sin_addr, sin_addr_len,
ip, ip_len, port, port_len, NI_NUMERICHOST | NI_NUMERICSERV ) != 0) {
ip[0] = '\0';
log_msg(LOG_ERR, "getnameinfo failed to get client_ip");
}
}
void* conn_handler( void *ptr )
{
int argc = GLOBAL(g, argc);
char **argv = GLOBAL(g, argv);
const int new_fd = CONN_TLSTOR(ptr, new_fd);
const int pipefd = GLOBAL(g, pipefd);
const char* const stats_url = GLOBAL(g, stats_url);
const char* const stats_text_url = GLOBAL(g, stats_text_url);
const int do_204 = GLOBAL(g, do_204);
const int do_redirect = GLOBAL(g, do_redirect);
#ifdef DEBUG
const int warning_time = GLOBAL(g, warning_time);
#endif
// NOTES:
// - from here on, all exit points should be counted or at least logged
// - exit() should not be called from the child process
response_struct pipedata = {0};
struct timeval timeout = {GLOBAL(g, select_timeout), 0};
int rv = 0;
char *buf = NULL, *bufptr = NULL;
char *url = NULL;
char* aspbuf = NULL;
const char* response;
int rsize;
char* version_string = NULL;
char* stat_string = NULL;
int num_req = 0; // number of requests processed by this thread
char *req_url = NULL;
unsigned int req_len = 0;
#define HOST_LEN_MAX 80
char host[HOST_LEN_MAX + 1];
char *post_buf = NULL;
size_t post_buf_len = 0;
unsigned int total_bytes = 0; /* number of bytes received by this thread */
#define CORS_ORIGIN_LEN_MAX 256
char *cors_origin = NULL;
char client_ip[INET6_ADDRSTRLEN]= {'\0'}; //yipst
char *method = NULL;
#ifdef DEBUG
int do_warning = (warning_time > 0);
// set up signal handling
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = child_signal_handler;
sigemptyset(&sa.sa_mask);
// set signal handler for termination
if (sigaction(SIGTERM, &sa, NULL)) {
log_msg(LGG_DEBUG, "sigaction(SIGTERM) reported error: %m");
}
// set signal handler for info
sa.sa_flags = SA_RESTART; // prevent EINTR from interrupted library calls
if (sigaction(SIGUSR2, &sa, NULL)) {
log_msg(LGG_DEBUG, "sigaction(SIGUSR2) reported error: %m");
}
}
printf("%s: tid = %d\n", __FUNCTION__, (int)pthread_self());
#endif
// the socket is connected, but we need to perform a check for incoming data
// since we're using blocking checks, we first want to set a timeout
if (setsockopt(new_fd, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(struct timeval)) < 0)
log_msg(LGG_DEBUG, "setsockopt(timeout) reported error: %m");
pipedata.ssl_ver = (CONN_TLSTOR(ptr, ssl)) ? SSL_version(CONN_TLSTOR(ptr, ssl)) : 0;
pipedata.run_time = CONN_TLSTOR(ptr, init_time);
get_client_ip(new_fd, client_ip, sizeof client_ip, NULL, 0);
/* main event loop */
while(1) {
/* wait for requests if no early data on initial connection */
if (!CONN_TLSTOR(ptr, early_data)) {
struct pollfd pfd = { new_fd, POLLIN, POLLIN };
int selrv = poll(&pfd, 1, 1000 * GLOBAL(g, http_keepalive));
TESTPRINT("socket:%d selrv:%d errno:%d\n", new_fd, selrv, errno);
/* selrv -1: error; selrv 0: no data before timed out;
selrv > 0 and peek_socket <= 0: client disconnects */
int peekrv = peek_socket(new_fd, CONN_TLSTOR(ptr, ssl));
if (total_bytes == 0 && peekrv <= 0) {
/* no data in the whole session. counted as one 'cls'
run_time is ignorable */
if (CONN_TLSTOR(ptr, ssl))
pipedata.ssl = SSL_HIT_CLS;
pipedata.status = FAIL_CLOSED;
pipedata.rx_total = 0;
write_pipe(pipefd, &pipedata);
num_req++;
break; /* done with this thread */
}
if (selrv <= 0 || peekrv <=0 )
break; /* done with this thread */
}
get_time(&start_time);
int log_verbose = log_get_verb();
response = httpnulltext;
rsize = 0;
post_buf_len = 0;
errno = 0;
rv = read_socket(new_fd, &buf, CONN_TLSTOR(ptr, ssl), CONN_TLSTOR(ptr, early_data));
if (rv <= 0) {
if (errno == ECONNRESET || rv == 0) {
log_msg(LGG_DEBUG, "recv() ECONNRESET: %m");
pipedata.status = FAIL_CLOSED;
} else if (errno == EAGAIN || errno == EWOULDBLOCK) {
log_msg(LGG_DEBUG, "recv() EAGAIN: %m");
pipedata.status = FAIL_TIMEOUT;
} else {
log_msg(LGG_DEBUG, "recv() error: %m");
pipedata.status = FAIL_GENERAL;
}
} else { // got some data
if (CONN_TLSTOR(ptr, ssl)) {
pipedata.ssl = CONN_TLSTOR(ptr, early_data) ? SSL_HIT_RTT0 : SSL_HIT;
} else {
pipedata.ssl = SSL_NOT_TLS;
}
TIME_CHECK("initial recv()");
buf[rv] = '\0';
TESTPRINT("\nreceived %d bytes\n'%s'\n", rv, buf);
pipedata.rx_total = rv;
total_bytes += rv;
#ifdef HEX_DUMP
hex_dump(buf, rv);
#endif
char *body = strstr_first(buf, "\r\n\r\n");
int body_len = (body) ? (rv + buf - body) : 0;
char *req = strtok_r(buf, "\r\n", &bufptr);
if (log_verbose >= LGG_INFO) {
if (req) {
host[0] = '\0';
if (strlen(req) > req_len) {
req_len = strlen(req);
req_url = realloc(req_url, req_len + 1);
req_url[0] = '\0';
}
strcpy(req_url, req);
/* locate and copy Host */
char *tmph = strstr_first(bufptr, "Host: "); // e.g. "Host: abc.com"
if (tmph) {
host[HOST_LEN_MAX] = '\0';
strncpy(host, tmph + 6 /* strlen("Host: ") */, HOST_LEN_MAX);
strtok(host, "\r\n");
TESTPRINT("socket:%d host:%s\n", new_fd, host);
}
}
}
/* CORS */
char *orig_hdr;
orig_hdr = strstr_first(bufptr, "Origin: ");
if (orig_hdr) {
cors_origin = realloc(cors_origin, CORS_ORIGIN_LEN_MAX);
strncpy(cors_origin, orig_hdr + 8, CORS_ORIGIN_LEN_MAX);
strtok(cors_origin, "\r\n");
if (strncmp(cors_origin, "null", 4) == 0) { /* some web developers are just ... */
cors_origin[0] = '*';
cors_origin[1] = '\0';
}
}
char *reqptr;
method = req ? strtok_r(req, " ", &reqptr) : NULL;
if (method == NULL) {
log_msg(LGG_DEBUG, "client did not specify method");
} else {
TESTPRINT("method: '%s'\n", method);
if (!strcmp(method, "OPTIONS")) {
pipedata.status = SEND_OPTIONS;
rsize = asprintf(&aspbuf, httpoptions);
response = aspbuf;
} else if (!strcmp(method, "POST")) {
int recv_len = 0;
int length = 0;
int post_buf_size = 0;
int wait_cnt = MAX_HTTP_POST_RETRY;
char *h = strstr_first(bufptr, "Content-Length:");
if (!h)
goto end_post;
h += strlen("Content-Length:");
length = atoi(strtok(h, "\r\n"));
if (log_verbose >= LGG_INFO) {
log_msg(LGG_DEBUG, "POST socket: %d Content-Length: %d", new_fd, length);
post_buf_size = (length < MAX_HTTP_POST_LEN) ? length : MAX_HTTP_POST_LEN;
post_buf = realloc(post_buf, post_buf_size + 1);
if (!post_buf) {
log_msg(LGG_ERR, "Out of memory. Cannot malloc receiver buffer.");
goto end_post;
}
post_buf[post_buf_size] = '\0';
/* body points to "\r\n\r\n" */
if (body && body_len > 4) {
recv_len = body_len - 4;
memcpy(post_buf, body + 4, recv_len);
length -= recv_len;
post_buf_size -= recv_len;
}
log_msg(LGG_DEBUG, "POST socket: %d expect length: %d", new_fd, length);
pipedata.run_time += elapsed_time_msec(start_time);
/* caputre POST content */
for (; length > 0 && wait_cnt > 0;) {
get_time(&start_time);
if (CONN_TLSTOR(ptr, ssl))
rv = ssl_read(CONN_TLSTOR(ptr, ssl), post_buf + recv_len, post_buf_size);
else
rv = recv(new_fd, post_buf + recv_len, post_buf_size, MSG_WAITALL);
log_msg(LGG_DEBUG, "POST socket:%d recv length:%d; errno:%d", new_fd, rv, errno);
if (rv > 0) {
pipedata.rx_total += rv;
length -= rv;
if ((recv_len + rv) < MAX_HTTP_POST_LEN) {
recv_len += rv;
post_buf_size -= rv;
post_buf[recv_len] = '\0';
} else {
if (length > CHAR_BUF_SIZE) {
/* discard bytes from 'MAX_HTTP_POST_LEN - CHAR_BUF_SIZE'
to 'Content-Length - CHAR_BUF_SIZE' */
recv_len += rv - CHAR_BUF_SIZE;
post_buf_size = CHAR_BUF_SIZE;
} else {
recv_len += rv - length;
post_buf_size = length;
}
}
pipedata.run_time += elapsed_time_msec(start_time);
wait_cnt = MAX_HTTP_POST_RETRY; /* reset timeout */
} else
--wait_cnt;
}
} else {
if (post_buf == NULL)
post_buf = malloc(CHAR_BUF_SIZE + 1);
/* body points to "\r\n\r\n" */
if (body && body_len > 4)
length -= body_len - 4;
pipedata.run_time += elapsed_time_msec(start_time);
/* caputre POST content */
for (; length > 0 && wait_cnt > 0;) {
get_time(&start_time);
if (CONN_TLSTOR(ptr, ssl))
rv = ssl_read(CONN_TLSTOR(ptr, ssl), post_buf, CHAR_BUF_SIZE);
else
rv = recv(new_fd, post_buf, CHAR_BUF_SIZE, 0);
if (rv > 0) {
pipedata.rx_total += rv;
length -= rv;
pipedata.run_time += elapsed_time_msec(start_time);
wait_cnt = MAX_HTTP_POST_RETRY; /* reset timeout */
} else
--wait_cnt;
}
/* drained data */
recv_len = 0;
}
get_time(&start_time);
end_post:
post_buf_len = recv_len;
pipedata.status = SEND_POST;
/* default httpnulltext response */
} else if (!strcmp(method, "GET")) {
// send default from here, no matter what happens
pipedata.status = DEFAULT_REPLY;
// trim up to non path chars
char *path = strtok_r(NULL, " ", &reqptr);
if (path == NULL) {
pipedata.status = SEND_NO_URL;
log_msg(LGG_DEBUG, "client did not specify URL for GET request");
} else if (!strncmp(path, "/favicon.ico", 12)) {
pipedata.status = SEND_ICO;
response = favicon_ico;
rsize = sizeof favicon_ico - 1;
} else if (!strncmp(path, "/log=", 5) && CONN_TLSTOR(ptr, allow_admin)) {
int v = atoi(path + strlen("/log="));
if (v > LGG_DEBUG || v < 0)
pipedata.status = SEND_BAD;
else {
pipedata.status = ACTION_LOG_VERB;
pipedata.verb = v;
}
} else if (!strncmp(path, "/ca.crt", 7)) {
FILE *fp;
char *ca_file = NULL;
response = httpfilenotfound;
rsize = sizeof httpfilenotfound;
pipedata.status = SEND_BAD_PATH;
if (asprintf(&ca_file, "%s%s", GLOBAL(g, pem_dir), "/ca.crt") > 0 &&
NULL != (fp = fopen(ca_file, "r")))
{
fseek(fp, 0L, SEEK_END);
long file_sz = ftell(fp);
rewind(fp);
rsize = asprintf(&aspbuf, "%s%ld%s", httpcacert, file_sz, httpcacert2);
if ((aspbuf = (char*)realloc(aspbuf, rsize + file_sz + 16)) != NULL &&
fread(aspbuf + rsize, 1, file_sz, fp) == (size_t)file_sz) {
// should be fairly safe to cast here
response = aspbuf;
rsize += file_sz;
pipedata.status = SEND_TXT;
}
fclose(fp);
}
free(ca_file);
/* aspbuf will be freed at the of the loop */
} else if (!strcmp(path, stats_url) && CONN_TLSTOR(ptr, allow_admin)) {
pipedata.status = SEND_STATS;
version_string = get_version(argc, argv);
stat_string = get_stats(1, 0);
rsize = asprintf(&aspbuf,
"%s%u%s%s%s<br>%s%s",
httpstats1,
(unsigned int)(statsbaselen + strlen(version_string) + 4 + strlen(stat_string)),
httpstats2,
httpstats3,
version_string,
stat_string,
httpstats4);
free(version_string);
free(stat_string);
response = aspbuf;
} else if (!strcmp(path, stats_text_url) && CONN_TLSTOR(ptr, allow_admin)) {
pipedata.status = SEND_STATSTEXT;
version_string = get_version(argc, argv);
stat_string = get_stats(0, 1);
rsize = asprintf(&aspbuf,
"%s%u%s%s\n%s%s",
txtstats1,
(unsigned int)(strlen(version_string) + 1 + strlen(stat_string) + 2),
txtstats2,
version_string,
stat_string,
txtstats3);
free(version_string);
free(stat_string);
response = aspbuf;
} else if (do_204 && (!strcasecmp(path, "/generate_204") || !strcasecmp(path, "/gen_204"))) {
pipedata.status = SEND_204;
response = http204;
rsize = sizeof http204 - 1;
} else if (!strncasecmp(path, "/pagead/imgad?", 14) ||
!strncasecmp(path, "/pagead/conversion/", 19 ) ||
!strncasecmp(path, "/pcs/view?xai=AKAOj", 19 ) ||
!strncasecmp(path, "/daca_images/simgad/", 20)) {
pipedata.status = SEND_GIF;
response = httpnullpixel;
rsize = sizeof httpnullpixel - 1;
} else {
// pick out encoded urls (usually advert redirects)
if (do_redirect && strcasestr(path, "=http")) {
char *decoded = malloc(strlen(path)+1);