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c5895ec292
This is another cleanup I felt a need for while I was doing boolification. If you define a function or variable in one .c file and declare it extern in another, then nothing will check you haven't got the types of the two declarations mismatched - so when you're _changing_ the type, it's a pain to make sure you've caught all the copies of it. It's better to put all those extern declarations in header files, so that the declaration in the header is also in scope for the definition. Then the compiler will complain if they don't match, which is what I want.
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* Windows support module which deals with being a named-pipe client.
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*/
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#include <stdio.h>
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#include <assert.h>
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#include "tree234.h"
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#include "putty.h"
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#include "network.h"
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#include "proxy.h"
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#include "ssh.h"
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#if !defined NO_SECURITY
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#include "winsecur.h"
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Socket *new_named_pipe_client(const char *pipename, Plug *plug)
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{
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HANDLE pipehandle;
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PSID usersid, pipeowner;
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PSECURITY_DESCRIPTOR psd;
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assert(strncmp(pipename, "\\\\.\\pipe\\", 9) == 0);
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assert(strchr(pipename + 9, '\\') == NULL);
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while (1) {
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pipehandle = CreateFile(pipename, GENERIC_READ | GENERIC_WRITE,
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0, NULL, OPEN_EXISTING,
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FILE_FLAG_OVERLAPPED, NULL);
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if (pipehandle != INVALID_HANDLE_VALUE)
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break;
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if (GetLastError() != ERROR_PIPE_BUSY) {
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return new_error_socket_fmt(
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plug, "Unable to open named pipe '%s': %s",
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pipename, win_strerror(GetLastError()));
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}
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/*
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* If we got ERROR_PIPE_BUSY, wait for the server to
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* create a new pipe instance. (Since the server is
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* expected to be winnps.c, which will do that immediately
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* after a previous connection is accepted, that shouldn't
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* take excessively long.)
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*/
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if (!WaitNamedPipe(pipename, NMPWAIT_USE_DEFAULT_WAIT)) {
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return new_error_socket_fmt(
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plug, "Error waiting for named pipe '%s': %s",
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pipename, win_strerror(GetLastError()));
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}
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}
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if ((usersid = get_user_sid()) == NULL) {
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CloseHandle(pipehandle);
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return new_error_socket_fmt(
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plug, "Unable to get user SID: %s", win_strerror(GetLastError()));
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}
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if (p_GetSecurityInfo(pipehandle, SE_KERNEL_OBJECT,
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OWNER_SECURITY_INFORMATION,
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&pipeowner, NULL, NULL, NULL,
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&psd) != ERROR_SUCCESS) {
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CloseHandle(pipehandle);
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return new_error_socket_fmt(
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plug, "Unable to get named pipe security information: %s",
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win_strerror(GetLastError()));
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}
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if (!EqualSid(pipeowner, usersid)) {
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CloseHandle(pipehandle);
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LocalFree(psd);
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return new_error_socket_fmt(
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plug, "Owner of named pipe '%s' is not us", pipename);
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}
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LocalFree(psd);
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return make_handle_socket(pipehandle, pipehandle, NULL, plug, true);
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}
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#endif /* !defined NO_SECURITY */
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