/* LibRCC - module comunicating with rcc-external helper application Copyright (C) 2005-2018 Suren A. Chilingaryan This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 2.1 or later as published by the Free Software Foundation. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include #include "../config.h" #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #ifdef HAVE_FCNTL_H # include #endif /* HAVE_FCNTL_H */ #ifdef HAVE_SIGNAL_H # include #endif /* HAVE_SIGNAL_H */ #ifdef HAVE_SYS_TYPES_H # include #endif /* HAVE_SYS_TYPES_H */ #ifdef HAVE_SYS_SOCKET_H # include #endif /* HAVE_SYS_SOCKET_H */ #ifdef HAVE_SYS_STAT_H # include #endif /* HAVE_SYS_STAT_H */ #ifdef HAVE_SYS_UN_H # include #endif /* HAVE_SYS_UN_H */ #ifdef HAVE_SYS_TIME_H # include #endif /* HAVE_SYS_TIME_H */ #ifdef HAVE_SYS_SELECT_H # include #endif /* HAVE_SYS_SELECT_H */ #ifdef HAVE_SYS_WAIT_H # include #endif /* HAVE_SYS_WAIT_H */ #include "rcchome.h" #include "rccexternal.h" #include "internal.h" #define RCC_EXT_PROG_NAME "rccexternal" #define RCC_EXTERNAL_TIMEOUT 250 /* 100us */ #ifdef HAVE_UNISTD_H static pid_t pid = (pid_t)-1; static char *addr = NULL; #endif /* HAVE_UNISTD_H */ int rccExternalInit() { #ifndef _WIN32 // WNOHANG is not defined #ifdef HAVE_UNISTD_H # ifdef HAVE_SIGNAL_H struct sigaction act; # endif /* HAVE_SIGNAL_H */ # ifdef HAVE_SYS_STAT_H struct stat st; # endif /* HAVE_SYS_STAT_H */ if (pid != (pid_t)-1) return 0; if (!addr) { addr = (char*)malloc(strlen(rcc_home_dir)+32); if (!addr) return -1; } pid = fork(); if (pid) { if (pid == (pid_t)-1) return -1; sprintf(addr,"%s/.rcc/comm/%lu.sock", rcc_home_dir, (unsigned long)pid); # ifdef HAVE_SIGNAL_H act.sa_handler = SIG_IGN; sigemptyset(&act.sa_mask); act.sa_flags = 0; sigaction(SIGPIPE,&act,NULL); # endif /* HAVE_SIGNAL_H */ return 0; } /*if ((!stat("../external/" RCC_EXT_PROG_NAME, &st))&&(st.st_mode&S_IXOTH)) { execl ("../external/" RCC_EXT_PROG_NAME, RCC_EXT_PROG_NAME, NULL); } else*/ # ifdef HAVE_SYS_STAT_H if ((!stat(LIBRCC_DATA_DIR "/" RCC_EXT_PROG_NAME, &st))&&(st.st_mode&S_IXOTH)) { # endif /* HAVE_SYS_STAT_H */ execl(LIBRCC_DATA_DIR "/" RCC_EXT_PROG_NAME, RCC_EXT_PROG_NAME, NULL); # ifdef HAVE_SYS_STAT_H } # endif /* HAVE_SYS_STAT_H */ #endif /* HAVE_UNISTD_H */ #endif /* _WIN32 */ _exit(1); } void rccExternalFree() { #ifndef _WIN32 // WNOHANG is not defined #ifdef HAVE_UNISTD_H int retry; pid_t res; struct timespec timeout = { 0, 5000000 }; if (pid == (pid_t)-1) return; for (retry = 0; retry < 3; retry++) { rccExternalConnect(0); nanosleep(&timeout, NULL); res = waitpid(pid, NULL, WNOHANG); if (res) break; else timeout.tv_nsec*=10; } pid = (pid_t)-1; if (addr) free(addr); #endif /* HAVE_UNISTD_H */ #endif /* _WIN32 */ } #ifdef HAVE_SYS_SELECT_H static int rccExternalSetDeadline(struct timeval *tv, unsigned long timeout) { /* gettimeofday(tv, NULL); tv->tv_sec += (tv->tv_usec + timeout + RCC_EXTERNAL_TIMEOUT) / 1000000; tv->tv_usec = (tv->tv_usec + timeout + RCC_EXTERNAL_TIMEOUT) % 1000000; */ tv->tv_sec = (timeout + RCC_EXTERNAL_TIMEOUT) / 1000000; tv->tv_usec = (timeout + RCC_EXTERNAL_TIMEOUT) % 1000000; return 0; } #endif /* HAVE_SYS_SELECT_H */ size_t rccExternalWrite(int s, const char *buffer, ssize_t size, unsigned long timeout) { #ifdef HAVE_SYS_SELECT_H int err; unsigned char connected = 1; ssize_t writed, res = 0; struct timeval tv; fd_set fdcon; if (s == -1) return -1; for (writed = 0; ((writed < size)&&(connected)); writed += connected?res:0) { FD_ZERO(&fdcon); FD_SET(s, &fdcon); rccExternalSetDeadline(&tv, timeout); err = select(s+1,NULL,&fdcon,NULL,&tv); if (err<=0) connected = 0; else { res = write(s, buffer + writed, size - writed); if (res<=0) connected = 0; } } return size - writed; #else /* HAVE_SYS_SELECT_H */ return -1; #endif /* HAVE_SYS_SELECT_H */ } size_t rccExternalRead(int s, char *buffer, ssize_t size, unsigned long timeout) { #ifdef HAVE_SYS_SELECT_H int err; unsigned char connected = 1; ssize_t readed, res = 0; struct timeval tv; fd_set fdcon; if (s == -1) return -1; for (readed = 0; ((readed < size)&&(connected)); readed += connected?res:0) { FD_ZERO(&fdcon); FD_SET(s, &fdcon); rccExternalSetDeadline(&tv, timeout); err = select(s+1,&fdcon,NULL,NULL,&tv); if (err<=0) connected = 0; else { res = read(s, buffer + readed, size - readed); if (res<=0) connected = 0; } } return size - readed; #else /* HAVE_SYS_SELECT_H */ return -1; #endif /* HAVE_SYS_SELECT_H */ } int rccExternalConnect(unsigned char module) { #ifdef HAVE_SYS_SOCKET_H int err; int retries = 10; int sock; int flags; struct sockaddr_un mysock; struct timeval tv; struct timespec ts; fd_set fdcon; if (pid == (pid_t)-1) return -1; sock = socket(PF_UNIX, SOCK_STREAM, 0); if (sock<=0) return -1; flags = fcntl(sock,F_GETFL,0); if (flags<0) flags = 0; if (fcntl(sock,F_SETFL,flags|O_NONBLOCK)<0) { close(sock); return -1; } memset(&mysock, 0, sizeof(mysock)); mysock.sun_family=AF_UNIX; strncpy(mysock.sun_path,addr,sizeof(mysock.sun_path)); mysock.sun_path[sizeof(mysock.sun_path)-1]=0; again: if (connect(sock,(struct sockaddr*)&mysock,sizeof(mysock))<0) { if (errno == EINPROGRESS) { FD_ZERO(&fdcon); FD_SET(sock, &fdcon); rccExternalSetDeadline(&tv, 0); err = select(sock+1,&fdcon,NULL,NULL,&tv); if (err<=0) { close(sock); return -1; } } else if ((errno == ENOENT)&&(retries)) { ts.tv_sec = (RCC_EXTERNAL_TIMEOUT/10) / 1000000; ts.tv_nsec = ((RCC_EXTERNAL_TIMEOUT/10) % 1000000)*1000; nanosleep(&ts, NULL); retries--; goto again; } else { close(sock); return -1; } } if (rccExternalWrite(sock, (char*)&module, 1, 0)) { close(sock); return -1; } return sock; #else /* HAVE_SYS_SOCKET_H */ return -1; #endif /* HAVE_SYS_SOCKET_H */ } void rccExternalClose(int s) { #ifdef HAVE_SYS_SOCKET_H ssize_t ret; unsigned char cmd = 0; if (s != -1) { ret = write(s, &cmd, 1); // retry once on signal if ((ret < 0)&&(errno == EINTR)) ret = write(s, &cmd, 1); close(s); } #endif /* HAVE_SYS_SOCKET_H */ } int rccExternalAllowOfflineMode() { int sock; int err; rcc_external_option opt = RCC_EXTERNAL_OPTION_OFFLINE; unsigned long opt_value = 1; sock = rccExternalConnect(RCC_EXTERNAL_MODULE_OPTIONS); if (sock) { err = rccExternalWrite(sock, (char*)&opt, sizeof(rcc_external_option), 0); if (!err) err = rccExternalWrite(sock, (char*)&opt_value, sizeof(unsigned long), 0); rccExternalClose(sock); return err; } return -1; }