Restore offset in splited request

conev.h

@@ -2,6 +2,7 @@
 #define CONEV_H
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #ifndef __linux__
     #define NOEPOLL
@@ -56,10 +57,10 @@ char *eid_name[] = {
 #endif
 
 struct buffer {
-    ssize_t size;
+    size_t size;
-    int offset;
+    unsigned int offset;
     char *data;
-    char locked;
+    bool locked;
 };
 
 struct eval {
@@ -75,11 +76,11 @@ struct eval {
         struct sockaddr_in6 in6;
     };
     ssize_t recv_count;
+    ssize_t round_sent;
     unsigned int round_count;
-    char last_round;
     int attempt;
-    char cache;
+    bool cache;
-    char mark; //
+    bool mark; //
 };
 
 struct poolhd {

desync.c

@@ -434,7 +434,7 @@ ssize_t desync(int sfd, char *buffer, size_t bfsize,
     char *host = 0;
     int len = 0, type = 0, host_pos = 0;
     
-    // parse packet
+    if (offset == 0) {
         if ((len = parse_tls(buffer, n, &host))) {
             type = IS_HTTPS;
         }
@@ -446,7 +446,7 @@ ssize_t desync(int sfd, char *buffer, size_t bfsize,
                 len, host, host - buffer);
             host_pos = host - buffer;
         }
-    
+    }
     // modify packet
     if (type == IS_HTTP && dp.mod_http) {
         LOG(LOG_S, "modify HTTP: n=%zd\n", n);
@@ -484,9 +484,8 @@ ssize_t desync(int sfd, char *buffer, size_t bfsize,
             lp = pos + 5;
         }
     }
-    // desync
     #ifdef __linux__
-    if (dp.drop_sack && drop_sack(sfd)) {
+    if (!offset && dp.drop_sack && drop_sack(sfd)) {
         return -1;
     }
     #endif
@@ -504,15 +503,14 @@ ssize_t desync(int sfd, char *buffer, size_t bfsize,
             
         pos += part.s * (part.r - r);
         
-        // after EAGAIN
+        if (!(part.flag & OFFSET_START) && offset && pos <= offset) {
-        if (offset && pos <= offset) {
             continue;
         }
-        else if (pos < 0 || pos > n || pos < lp) {
+        if (pos < 0 || pos > n || pos < lp) {
             LOG(LOG_E, "split cancel: pos=%ld-%ld, n=%zd\n", lp, pos, n);
             break;
         }
-        // send part
+        
         ssize_t s = 0;
         switch (part.m) {
             #ifdef FAKE_SUPPORT

extend.c

@@ -367,8 +367,11 @@ ssize_t tcp_send_hook(struct poolhd *pool, struct eval *remote,
     int m = client->attempt;
     LOG((m ? LOG_S : LOG_L), "desync params index: %d\n", m);
     
+    ssize_t offset = client->round_sent + client->buff.offset;
+    if (!offset && remote->round_count) offset = -1;
+    
     sn = desync(remote->fd, buffer, bfsize, n,
-        0, (struct sockaddr *)&remote->in6, m);
+        offset, (struct sockaddr *)&remote->in6, m);
     return sn;
 }
 

main.c

@@ -421,7 +421,8 @@ int parse_offset(struct part *part, const char *str)
             case 'r':
                 part->flag |= OFFSET_RAND;
                 break;
-            case 's':;
+            case 's':
+                part->flag |= OFFSET_START;
         }
     }
     part->pos = val;

params.h

@@ -26,6 +26,7 @@
 #define OFFSET_RAND 4
 #define OFFSET_SNI 8
 #define OFFSET_HOST 16
+#define OFFSET_START 32
 
 #define DETECT_HTTP_LOCAT 1
 #define DETECT_TLS_ERR 2

proxy.c

@@ -686,13 +686,13 @@ int on_tunnel(struct poolhd *pool, struct eval *val,
             return -1;
         }
         val->recv_count += n;
-        if (!val->last_round) {
+        if (val->round_sent == 0) {
             val->round_count++;
-            val->last_round = 1;
+            pair->round_sent = 0;
-            pair->last_round = 0;
         }
         
         ssize_t sn = tcp_send_hook(pool, pair, buffer, bfsize, n);
+        val->round_sent += sn > 0 ? sn : 0;
         if (sn < n) {
             if (sn < 0) {
                 uniperror("send");