/* * QEMU low level functions * * Copyright (c) 2003 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include <stdlib.h> #include <stdio.h> #include <stdarg.h> #include <stdbool.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <fcntl.h> /* Needed early for CONFIG_BSD etc. */ #include "config-host.h" #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) #include <sys/mman.h> #endif #ifdef CONFIG_SOLARIS #include <sys/types.h> #include <sys/statvfs.h> /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for discussion about Solaris header problems */ extern int madvise(caddr_t, size_t, int); #endif #include "qemu-common.h" #include "trace.h" #include "qemu_socket.h" #include "monitor.h" static bool fips_enabled = false; static const char *qemu_version = QEMU_VERSION; int socket_set_cork(int fd, int v) { #if defined(SOL_TCP) && defined(TCP_CORK) return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v)); #else return 0; #endif } int qemu_madvise(void *addr, size_t len, int advice) { if (advice == QEMU_MADV_INVALID) { errno = EINVAL; return -1; } #if defined(CONFIG_MADVISE) return madvise(addr, len, advice); #elif defined(CONFIG_POSIX_MADVISE) return posix_madvise(addr, len, advice); #else errno = EINVAL; return -1; #endif } #ifndef _WIN32 /* * Dups an fd and sets the flags */ static int qemu_dup_flags(int fd, int flags) { int ret; int serrno; int dup_flags; int setfl_flags; #ifdef F_DUPFD_CLOEXEC ret = fcntl(fd, F_DUPFD_CLOEXEC, 0); #else ret = dup(fd); if (ret != -1) { qemu_set_cloexec(ret); } #endif if (ret == -1) { goto fail; } dup_flags = fcntl(ret, F_GETFL); if (dup_flags == -1) { goto fail; } if ((flags & O_SYNC) != (dup_flags & O_SYNC)) { errno = EINVAL; goto fail; } /* Set/unset flags that we can with fcntl */ setfl_flags = O_APPEND | O_ASYNC | O_NONBLOCK; #ifdef O_NOATIME setfl_flags |= O_NOATIME; #endif #ifdef O_DIRECT setfl_flags |= O_DIRECT; #endif dup_flags &= ~setfl_flags; dup_flags |= (flags & setfl_flags); if (fcntl(ret, F_SETFL, dup_flags) == -1) { goto fail; } /* Truncate the file in the cases that open() would truncate it */ if (flags & O_TRUNC || ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) { if (ftruncate(ret, 0) == -1) { goto fail; } } return ret; fail: serrno = errno; if (ret != -1) { close(ret); } errno = serrno; return -1; } #endif /* * Opens a file with FD_CLOEXEC set */ int qemu_open(const char *name, int flags, ...) { int ret; int mode = 0; #ifndef _WIN32 const char *fdset_id_str; /* Attempt dup of fd from fd set */ if (strstart(name, "/dev/fdset/", &fdset_id_str)) { int64_t fdset_id; int fd, dupfd; fdset_id = qemu_parse_fdset(fdset_id_str); if (fdset_id == -1) { errno = EINVAL; return -1; } fd = monitor_fdset_get_fd(fdset_id, flags); if (fd == -1) { return -1; } dupfd = qemu_dup_flags(fd, flags); if (dupfd == -1) { return -1; } ret = monitor_fdset_dup_fd_add(fdset_id, dupfd); if (ret == -1) { close(dupfd); errno = EINVAL; return -1; } return dupfd; } #endif if (flags & O_CREAT) { va_list ap; va_start(ap, flags); mode = va_arg(ap, int); va_end(ap); } #ifdef O_CLOEXEC ret = open(name, flags | O_CLOEXEC, mode); #else ret = open(name, flags, mode); if (ret >= 0) { qemu_set_cloexec(ret); } #endif return ret; } int qemu_close(int fd) { int64_t fdset_id; /* Close fd that was dup'd from an fdset */ fdset_id = monitor_fdset_dup_fd_find(fd); if (fdset_id != -1) { int ret; ret = close(fd); if (ret == 0) { monitor_fdset_dup_fd_remove(fd); } return ret; } return close(fd); } /* * A variant of write(2) which handles partial write. * * Return the number of bytes transferred. * Set errno if fewer than `count' bytes are written. * * This function don't work with non-blocking fd's. * Any of the possibilities with non-bloking fd's is bad: * - return a short write (then name is wrong) * - busy wait adding (errno == EAGAIN) to the loop */ ssize_t qemu_write_full(int fd, const void *buf, size_t count) { ssize_t ret = 0; ssize_t total = 0; while (count) { ret = write(fd, buf, count); if (ret < 0) { if (errno == EINTR) continue; break; } count -= ret; buf += ret; total += ret; } return total; } /* * Opens a socket with FD_CLOEXEC set */ int qemu_socket(int domain, int type, int protocol) { int ret; #ifdef SOCK_CLOEXEC ret = socket(domain, type | SOCK_CLOEXEC, protocol); if (ret != -1 || errno != EINVAL) { return ret; } #endif ret = socket(domain, type, protocol); if (ret >= 0) { qemu_set_cloexec(ret); } return ret; } /* * Accept a connection and set FD_CLOEXEC */ int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) { int ret; #ifdef CONFIG_ACCEPT4 ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); if (ret != -1 || errno != ENOSYS) { return ret; } #endif ret = accept(s, addr, addrlen); if (ret >= 0) { qemu_set_cloexec(ret); } return ret; } /* * A variant of send(2) which handles partial write. * * Return the number of bytes transferred, which is only * smaller than `count' if there is an error. * * This function won't work with non-blocking fd's. * Any of the possibilities with non-bloking fd's is bad: * - return a short write (then name is wrong) * - busy wait adding (errno == EAGAIN) to the loop */ ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags) { ssize_t ret = 0; ssize_t total = 0; while (count) { ret = send(fd, buf, count, flags); if (ret < 0) { if (errno == EINTR) { continue; } break; } count -= ret; buf += ret; total += ret; } return total; } /* * A variant of recv(2) which handles partial write. * * Return the number of bytes transferred, which is only * smaller than `count' if there is an error. * * This function won't work with non-blocking fd's. * Any of the possibilities with non-bloking fd's is bad: * - return a short write (then name is wrong) * - busy wait adding (errno == EAGAIN) to the loop */ ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags) { ssize_t ret = 0; ssize_t total = 0; while (count) { ret = qemu_recv(fd, buf, count, flags); if (ret <= 0) { if (ret < 0 && errno == EINTR) { continue; } break; } count -= ret; buf += ret; total += ret; } return total; } void qemu_set_version(const char *version) { qemu_version = version; } const char *qemu_get_version(void) { return qemu_version; } void fips_set_state(bool requested) { #ifdef __linux__ if (requested) { FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r"); if (fds != NULL) { fips_enabled = (fgetc(fds) == '1'); fclose(fds); } } #else fips_enabled = false; #endif /* __linux__ */ #ifdef _FIPS_DEBUG fprintf(stderr, "FIPS mode %s (requested %s)\n", (fips_enabled ? "enabled" : "disabled"), (requested ? "enabled" : "disabled")); #endif } bool fips_get_state(void) { return fips_enabled; }