From c6c951f641009b2593794187bbb199de285339e6 Mon Sep 17 00:00:00 2001
From: raster <raster@7cbeb6ba-43b4-40fd-8cce-4c39aea84d33>
Date: Sun, 31 May 2009 22:03:24 +0000
Subject: [PATCH] add request # tracking. this should detect badness - like
 forking and using the connection from the fork (the cserve connection). it
 won't catch threads... most of the time, but i need something else for that i
 think.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/evas@40869 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33
---
 src/lib/cserve/evas_cs.h        |  2 ++
 src/lib/cserve/evas_cs_client.c | 21 ++++++++++++++++-----
 src/lib/cserve/evas_cs_server.c | 29 ++++++++++++++++++++---------
 3 files changed, 38 insertions(+), 14 deletions(-)

diff --git a/src/lib/cserve/evas_cs.h b/src/lib/cserve/evas_cs.h
index 574e04a..68b3085 100644
--- a/src/lib/cserve/evas_cs.h
+++ b/src/lib/cserve/evas_cs.h
@@ -64,6 +64,7 @@ struct _Server
    void *data;
    pid_t pid;
    int server_id;
+   int req_from, req_to;
 };
 
 struct _Client
@@ -78,6 +79,7 @@ struct _Client
    void (*func) (void *fdata, Client *c);
    void *data;
    pid_t pid;
+   int req_from, req_to;
 };
 
 struct _Mem
diff --git a/src/lib/cserve/evas_cs_client.c b/src/lib/cserve/evas_cs_client.c
index 957202e..c867af4 100644
--- a/src/lib/cserve/evas_cs_client.c
+++ b/src/lib/cserve/evas_cs_client.c
@@ -85,13 +85,15 @@ server_disconnect(Server *s)
 static int
 server_send(Server *s, int opcode, int size, unsigned char *data)
 {
-   int ints[2];
+   int ints[3];
    int num;
    
    pipe_handle(1);
    ints[0] = size;
    ints[1] = opcode;
-   num = write(s->fd, ints, (sizeof(int) * 2));
+   s->req_to++;
+   ints[2] = s->req_to;
+   num = write(s->fd, ints, (sizeof(int) * 3));
    if (num < 0)
      {
         pipe_handle(0);
@@ -114,11 +116,11 @@ server_send(Server *s, int opcode, int size, unsigned char *data)
 static unsigned char *
 server_read(Server *s, int *opcode, int *size)
 {
-   int ints[2], num, left;
+   int ints[3], num, left;
    unsigned char *data;
    
-   num = read(s->fd, ints, sizeof(int) * 2);
-   if (num != (sizeof(int) * 2))
+   num = read(s->fd, ints, sizeof(int) * 3);
+   if (num != (sizeof(int) * 3))
      {
         if (cserve) server_disconnect(cserve);
         cserve = NULL;
@@ -127,6 +129,15 @@ server_read(Server *s, int *opcode, int *size)
    *size = ints[0];
    *opcode = ints[1];
    if ((*size < 0) || (*size > (1024 * 1024))) return NULL;
+   if (ints[2] != (s->req_from + 1))
+     {
+        printf("EEK! sequence number mismatch from serer with pid: %i\n"
+               "---- num %i is not 1 more than %i\n"
+               ,
+               s->pid, ints[2], s->req_from);
+        return NULL;
+     }
+   s->req_from++;
    data = malloc(*size);
    if (!data) return NULL;
    num = read(s->fd, data, *size);
diff --git a/src/lib/cserve/evas_cs_server.c b/src/lib/cserve/evas_cs_server.c
index abc27bf..63286a3 100644
--- a/src/lib/cserve/evas_cs_server.c
+++ b/src/lib/cserve/evas_cs_server.c
@@ -178,13 +178,15 @@ evas_cserve_client_send(Client *c, int opcode, int size, unsigned char *data)
    unsigned char *data2;
    int *ints;
    
-   data2 = malloc(size + (sizeof(int) * 2));
+   data2 = malloc(size + (sizeof(int) * 3));
    if (!data2) return;
    ints = (int *)data2;
    ints[0] = size;
    ints[1] = opcode;
-   memcpy(data2 + (sizeof(int) * 2), data, size);
-   client_write(c, data2, size + (sizeof(int) * 2));
+   c->req_to++;
+   ints[2] = c->req_to;
+   memcpy(data2 + (sizeof(int) * 3), data, size);
+   client_write(c, data2, size + (sizeof(int) * 3));
    free(data2);
 }
 
@@ -211,13 +213,22 @@ server_parse(Server *s, Client *c)
    ints = (int *)((c->inbuf));
    if ((ints[0] < 0) || (ints[0] > (1024 * 1024)))
      return 0;
-   if (c->inbufsize < (ints[0] + (sizeof(int) * 2)))
+   if (c->inbufsize < (ints[0] + (sizeof(int) * 3)))
      {
         return 0;
      }
-   data = c->inbuf + (sizeof(int) * 2);
+   data = c->inbuf + (sizeof(int) * 3);
+   if (ints[2] != (c->req_from + 1))
+     {
+        printf("EEK! sequence number mismatch from client with pid: %i\n"
+               "---- num %i is not 1 more than %i\n"
+               ,
+               c->pid, ints[2], c->req_from);
+        return 0;
+     }
+   c->req_from++;
    server_message_handle(s, c, ints[1], ints[0], data);
-   c->inbufalloc -= ints[0] + (sizeof(int) * 2);
+   c->inbufalloc -= ints[0] + (sizeof(int) * 3);
    if (c->inbufalloc == 0)
      {
         free(c->inbuf);
@@ -228,12 +239,12 @@ server_parse(Server *s, Client *c)
    newbuf = malloc(c->inbufalloc);
    if (!newbuf)
      {
-        c->inbufalloc += ints[0] + (sizeof(int) * 2);
+        c->inbufalloc += ints[0] + (sizeof(int) * 3);
         /* fixme - bad situation */
         return 0;
      }
-   memcpy(newbuf, c->inbuf + ints[0] + (sizeof(int) * 2), c->inbufalloc);
-   c->inbufsize -= ints[0] + (sizeof(int) * 2);
+   memcpy(newbuf, c->inbuf + ints[0] + (sizeof(int) * 3), c->inbufalloc);
+   c->inbufsize -= ints[0] + (sizeof(int) * 3);
    free(c->inbuf);
    c->inbuf = newbuf;
    return 1;
-- 
2.7.4