4589a877f0
git-svn-id: svn://svn.code.sf.net/p/rdesktop/code/trunk/rdesktop@95 423420c4-83ab-492f-b58f-81f9feb106b5
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
/*
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rdesktop: A Remote Desktop Protocol client.
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User interface services - X keyboard mapping
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Copyright (C) Matthew Chapman 1999-2001
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <sys/types.h>
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#include <signal.h>
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#include <stdio.h>
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#include <errno.h>
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#include "rdesktop.h"
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#include <assert.h>
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#include <unistd.h>
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#include <sys/wait.h>
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/* Execute specified askpass program and fetch password from standard
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output. Return NULL on failure, otherwise a pointer to the data
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read (which must be freed by caller) */
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char *
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askpass(char *askpass, const char *msg)
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{
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pid_t pid;
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size_t len;
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char *pass;
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int p[2], status, ret;
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char buf[1024];
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if (fflush(stdout) != 0)
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error("askpass: fflush: %s", strerror(errno));
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assert(askpass != NULL);
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if (pipe(p) < 0)
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{
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error("askpass: pipe: %s", strerror(errno));
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return NULL;
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}
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pid = fork();
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switch (pid)
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{
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case -1:
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error("askpass: fork: %s", strerror(errno));
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return NULL;
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break;
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case 0:
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/* Child */
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seteuid(getuid());
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setuid(getuid());
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/* Close read end */
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close(p[0]);
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if (dup2(p[1], STDOUT_FILENO) < 0)
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{
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error("askpass: dup2: %s", strerror(errno));
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exit(1);
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}
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execlp(askpass, askpass, msg, (char *) 0);
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error("askpass: exec(%s): %s", askpass, strerror(errno));
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exit(1);
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break;
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default:
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/* Parent */
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break;
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}
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/* Close write end */
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close(p[1]);
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len = ret = 0;
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do
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{
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ret = read(p[0], buf + len, sizeof(buf) - 1 - len);
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if (ret == -1 && errno == EINTR)
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continue;
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if (ret <= 0)
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break;
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len += ret;
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}
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while (sizeof(buf) - 1 - len > 0);
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buf[len] = '\0';
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close(p[0]);
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while (waitpid(pid, &status, 0) < 0)
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if (errno != EINTR)
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break;
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if (WIFEXITED(status))
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{
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if (WEXITSTATUS(status))
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{
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error("askpass program returned %d\n", WEXITSTATUS(status));
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return NULL;
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}
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}
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else
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{
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error("abnormal exit from askpass program");
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return NULL;
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}
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buf[strcspn(buf, "\r\n")] = '\0';
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pass = strdup(buf);
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memset(buf, 0, sizeof(buf));
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return pass;
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}
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