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https://github.com/VincentWei/MiniGUI.git
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108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
/*
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* This file is part of MiniGUI, a mature cross-platform windowing
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* and Graphics User Interface (GUI) support system for embedded systems
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* and smart IoT devices.
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*
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* Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
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* Copyright (C) 1998~2002, WEI Yongming
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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 3 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, see <http://www.gnu.org/licenses/>.
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*
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* Or,
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*
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* As this program is a library, any link to this program must follow
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* GNU General Public License version 3 (GPLv3). If you cannot accept
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* GPLv3, you need to be licensed from FMSoft.
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*
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* If you have got a commercial license of this program, please use it
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* under the terms and conditions of the commercial license.
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*
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* For more information about the commercial license, please refer to
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* <http://www.minigui.com/en/about/licensing-policy/>.
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*/
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/*
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** servaccept.c: accept connection from clients.
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**
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** Current maintainer: Wei Yongming.
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**
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** Create date: 2000/12/19
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**
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** NOTE: The idea comes from sample code in APUE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <stddef.h>
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#include <time.h>
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#include <unistd.h>
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#include "ourhdr.h"
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#define STALE 30 /* client's name can't be older than this (sec) */
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/* Wait for a client connection to arrive, and accept it.
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* We also obtain the client's pid from the pathname
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* that it must bind before calling us. */
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/* returns new fd if all OK, < 0 on error */
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int serv_accept (int listenfd, pid_t *pidptr, uid_t *uidptr)
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{
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int clifd;
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socklen_t len;
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time_t staletime;
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struct sockaddr_un unix_addr;
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struct stat statbuf;
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const char* pid_str;
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len = sizeof (unix_addr);
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if ( (clifd = accept (listenfd, (struct sockaddr *) &unix_addr, &len)) < 0)
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return (-1); /* often errno=EINTR, if signal caught */
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/* obtain the client's uid from its calling address */
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len -= /* th sizeof(unix_addr.sun_len) - */ sizeof(unix_addr.sun_family);
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/* len of pathname */
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unix_addr.sun_path[len] = 0; /* null terminate */
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if (stat(unix_addr.sun_path, &statbuf) < 0)
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return(-2);
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#ifdef S_ISSOCK /* not defined for SVR4 */
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if (S_ISSOCK(statbuf.st_mode) == 0)
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return(-3); /* not a socket */
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#endif
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if ((statbuf.st_mode & (S_IRWXG | S_IRWXO)) ||
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(statbuf.st_mode & S_IRWXU) != S_IRWXU)
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return(-4); /* is not rwx------ */
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staletime = time(NULL) - STALE;
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if (statbuf.st_atime < staletime ||
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statbuf.st_ctime < staletime ||
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statbuf.st_mtime < staletime)
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return(-5); /* i-node is too old */
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if (uidptr != NULL)
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*uidptr = statbuf.st_uid; /* return uid of caller */
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/* get pid of client from sun_path */
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pid_str = strrchr (unix_addr.sun_path, '/');
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pid_str++;
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*pidptr = atoi (pid_str);
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unlink (unix_addr.sun_path); /* we're done with pathname now */
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return (clifd);
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}
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