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pcapif: add option PCAPIF_RX_READONLY to simulate readonly RX

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This uses VirtualAlloc/VirtualProtect on windows to simulate RX buffers
that are readonly to lwIP (see task #14807).

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>
This commit is contained in:
Simon Goldschmidt
2020-02-16 20:43:33 +01:00
parent ea9726056c
commit 04cf6bbe66
3 changed files with 72 additions and 1 deletions
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37
contrib/ports/win32/pcapif_helper.c
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@@ -78,6 +78,43 @@ void pcapifh_linkstate_close(struct pcapifh_linkstate* state)
}
}
/** Helper function for PCAPIF_RX_READONLY for windows: copy the date to a new
* page which is set to READONLY after copying.
* This is a helper to simulate hardware that receives to memory that cannot be
* written by the CPU.
*/
void *
pcapifh_alloc_readonly_copy(void *data, size_t len)
{
DWORD oldProtect;
void *ret;
if (len > 4096) {
lwip_win32_platform_diag("pcapifh_alloc_readonly_copy: invalid len: %d\n", len);
while(1);
}
ret = VirtualAlloc(NULL, 4096, MEM_COMMIT, PAGE_READWRITE);
if (ret == NULL) {
lwip_win32_platform_diag("VirtualAlloc failed: %d\n", GetLastError());
while(1);
}
memcpy(ret, data, len);
if (!VirtualProtect(ret, len, PAGE_READONLY, &oldProtect)) {
lwip_win32_platform_diag("VirtualProtect failed: %d\n", GetLastError());
while(1);
}
printf("pcapifh_alloc_readonly_copy(%d): 0x%08x\n", len, ret);
return ret;
}
void
pcapifh_free_readonly_mem(void *data)
{
if (!VirtualFree(data, 0, MEM_RELEASE)) {
lwip_win32_platform_diag("VirtualFree(0x%08x) failed: %d\n", data, GetLastError());
while(1);
}
}
#else /* WIN32 */
/* @todo: add linux/unix implementation? */