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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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len += ret; |
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} |
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while (sizeof(buf) - 1 - len > 0); |
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|
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|
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buf[len] = '\0'; |
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|
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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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|
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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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|
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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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