| |
| /*--------------------------------------------------------------------*/ |
| /*--- File- and socket-related libc stuff. m_libcfile.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2005 Julian Seward |
| jseward@acm.org |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "pub_core_basics.h" |
| #include "pub_core_libcbase.h" |
| #include "pub_core_libcassert.h" |
| #include "pub_core_libcfile.h" |
| #include "pub_core_libcprint.h" // VG_(sprintf) |
| #include "pub_core_libcproc.h" // VG_(getpid), VG_(getppid) |
| #include "pub_core_clientstate.h" // VG_(fd_hard_limit) |
| #include "pub_core_syscall.h" |
| #include "vki_unistd.h" |
| |
| /* --------------------------------------------------------------------- |
| File stuff |
| ------------------------------------------------------------------ */ |
| |
| static inline Bool fd_exists(Int fd) |
| { |
| struct vki_stat st; |
| |
| return VG_(fstat)(fd, &st) == 0; |
| } |
| |
| /* Move an fd into the Valgrind-safe range */ |
| Int VG_(safe_fd)(Int oldfd) |
| { |
| Int newfd; |
| |
| vg_assert(VG_(fd_hard_limit) != -1); |
| |
| newfd = VG_(fcntl)(oldfd, VKI_F_DUPFD, VG_(fd_hard_limit)); |
| if (newfd != -1) |
| VG_(close)(oldfd); |
| |
| VG_(fcntl)(newfd, VKI_F_SETFD, VKI_FD_CLOEXEC); |
| |
| vg_assert(newfd >= VG_(fd_hard_limit)); |
| return newfd; |
| } |
| |
| /* Given a file descriptor, attempt to deduce its filename. To do |
| this, we use /proc/self/fd/<FD>. If this doesn't point to a file, |
| or if it doesn't exist, we return False. */ |
| Bool VG_(resolve_filename) ( Int fd, HChar* buf, Int n_buf ) |
| { |
| HChar tmp[64]; |
| |
| VG_(sprintf)(tmp, "/proc/self/fd/%d", fd); |
| VG_(memset)(buf, 0, n_buf); |
| |
| if (VG_(readlink)(tmp, buf, n_buf) > 0 && buf[0] == '/') |
| return True; |
| else |
| return False; |
| } |
| |
| SysRes VG_(open) ( const Char* pathname, Int flags, Int mode ) |
| { |
| SysRes res = VG_(do_syscall3)(__NR_open, (UWord)pathname, flags, mode); |
| return res; |
| } |
| |
| void VG_(close) ( Int fd ) |
| { |
| (void)VG_(do_syscall1)(__NR_close, fd); |
| } |
| |
| Int VG_(read) ( Int fd, void* buf, Int count) |
| { |
| SysRes res = VG_(do_syscall3)(__NR_read, fd, (UWord)buf, count); |
| return res.isError ? -1 : res.val; |
| } |
| |
| Int VG_(write) ( Int fd, const void* buf, Int count) |
| { |
| SysRes res = VG_(do_syscall3)(__NR_write, fd, (UWord)buf, count); |
| return res.isError ? -1 : res.val; |
| } |
| |
| Int VG_(pipe) ( Int fd[2] ) |
| { |
| SysRes res = VG_(do_syscall1)(__NR_pipe, (UWord)fd); |
| return res.isError ? -1 : 0; |
| } |
| |
| OffT VG_(lseek) ( Int fd, OffT offset, Int whence ) |
| { |
| SysRes res = VG_(do_syscall3)(__NR_lseek, fd, offset, whence); |
| return res.isError ? (-1) : 0; |
| /* if you change the error-reporting conventions of this, also |
| change VG_(pread) and all other usage points. */ |
| } |
| |
| SysRes VG_(stat) ( Char* file_name, struct vki_stat* buf ) |
| { |
| SysRes res = VG_(do_syscall2)(__NR_stat, (UWord)file_name, (UWord)buf); |
| return res; |
| } |
| |
| Int VG_(fstat) ( Int fd, struct vki_stat* buf ) |
| { |
| SysRes res = VG_(do_syscall2)(__NR_fstat, fd, (UWord)buf); |
| return res.isError ? (-1) : 0; |
| } |
| |
| Int VG_(fsize) ( Int fd ) |
| { |
| struct vki_stat buf; |
| SysRes res = VG_(do_syscall2)(__NR_fstat, fd, (UWord)&buf); |
| return res.isError ? (-1) : buf.st_size; |
| } |
| |
| Bool VG_(is_dir) ( HChar* f ) |
| { |
| struct vki_stat buf; |
| SysRes res = VG_(do_syscall2)(__NR_stat, (UWord)f, (UWord)&buf); |
| return res.isError ? False |
| : VKI_S_ISDIR(buf.st_mode) ? True : False; |
| } |
| |
| SysRes VG_(dup) ( Int oldfd ) |
| { |
| return VG_(do_syscall1)(__NR_dup, oldfd); |
| } |
| |
| /* Returns -1 on error. */ |
| Int VG_(fcntl) ( Int fd, Int cmd, Int arg ) |
| { |
| SysRes res = VG_(do_syscall3)(__NR_fcntl, fd, cmd, arg); |
| return res.isError ? -1 : res.val; |
| } |
| |
| Int VG_(rename) ( Char* old_name, Char* new_name ) |
| { |
| SysRes res = VG_(do_syscall2)(__NR_rename, (UWord)old_name, (UWord)new_name); |
| return res.isError ? (-1) : 0; |
| } |
| |
| Int VG_(unlink) ( Char* file_name ) |
| { |
| SysRes res = VG_(do_syscall1)(__NR_unlink, (UWord)file_name); |
| return res.isError ? (-1) : 0; |
| } |
| |
| /* Nb: we do not allow the Linux extension which malloc()s memory for the |
| buffer if buf==NULL, because we don't want Linux calling malloc() */ |
| Bool VG_(getcwd) ( Char* buf, SizeT size ) |
| { |
| SysRes res; |
| vg_assert(buf != NULL); |
| res = VG_(do_syscall2)(__NR_getcwd, (UWord)buf, size); |
| return res.isError ? False : True; |
| } |
| |
| Int VG_(readlink) (Char* path, Char* buf, UInt bufsiz) |
| { |
| SysRes res; |
| /* res = readlink( path, buf, bufsiz ); */ |
| res = VG_(do_syscall3)(__NR_readlink, (UWord)path, (UWord)buf, bufsiz); |
| return res.isError ? -1 : res.val; |
| } |
| |
| Int VG_(getdents) (UInt fd, struct vki_dirent *dirp, UInt count) |
| { |
| SysRes res; |
| /* res = getdents( fd, dirp, count ); */ |
| res = VG_(do_syscall3)(__NR_getdents, fd, (UWord)dirp, count); |
| return res.isError ? -1 : res.val; |
| } |
| |
| /* Check accessibility of a file. Returns zero for access granted, |
| nonzero otherwise. */ |
| Int VG_(access) ( HChar* path, Bool irusr, Bool iwusr, Bool ixusr ) |
| { |
| #if defined(VGO_linux) |
| /* Very annoyingly, I cannot find any definition for R_OK et al in |
| the kernel interfaces. Therefore I reluctantly resort to |
| hardwiring in these magic numbers that I determined by |
| experimentation. */ |
| UWord w = (irusr ? 4/*R_OK*/ : 0) |
| | (iwusr ? 2/*W_OK*/ : 0) |
| | (ixusr ? 1/*X_OK*/ : 0); |
| SysRes res = VG_(do_syscall2)(__NR_access, (UWord)path, w); |
| return res.isError ? 1 : res.val; |
| #else |
| # error "Don't know how to do VG_(access) on this OS" |
| #endif |
| } |
| |
| /* |
| Emulate the normal Unix permissions checking algorithm. |
| |
| If owner matches, then use the owner permissions, else |
| if group matches, then use the group permissions, else |
| use other permissions. |
| |
| Note that we can't deal with SUID/SGID, so we refuse to run them |
| (otherwise the executable may misbehave if it doesn't have the |
| permissions it thinks it does). |
| */ |
| /* returns: 0 = success, non-0 is failure */ |
| Int VG_(check_executable)(HChar* f) |
| { |
| struct vki_stat st; |
| SysRes res; |
| |
| res = VG_(stat)(f, &st); |
| if (res.isError) { |
| return res.val; |
| } |
| |
| if (st.st_mode & (VKI_S_ISUID | VKI_S_ISGID)) { |
| //VG_(printf)("Can't execute suid/sgid executable %s\n", exe); |
| return VKI_EACCES; |
| } |
| |
| if (VG_(geteuid)() == st.st_uid) { |
| if (!(st.st_mode & VKI_S_IXUSR)) |
| return VKI_EACCES; |
| } else { |
| int grpmatch = 0; |
| |
| if (VG_(getegid)() == st.st_gid) |
| grpmatch = 1; |
| else { |
| UInt groups[32]; |
| Int ngrp = VG_(getgroups)(32, groups); |
| Int i; |
| /* ngrp will be -1 if VG_(getgroups) failed. */ |
| for (i = 0; i < ngrp; i++) { |
| if (groups[i] == st.st_gid) { |
| grpmatch = 1; |
| break; |
| } |
| } |
| } |
| |
| if (grpmatch) { |
| if (!(st.st_mode & VKI_S_IXGRP)) { |
| return VKI_EACCES; |
| } |
| } else if (!(st.st_mode & VKI_S_IXOTH)) { |
| return VKI_EACCES; |
| } |
| } |
| |
| return 0; |
| } |
| |
| SysRes VG_(pread) ( Int fd, void* buf, Int count, Int offset ) |
| { |
| OffT off = VG_(lseek)( fd, (OffT)offset, VKI_SEEK_SET); |
| if (off != 0) |
| return VG_(mk_SysRes_Error)( VKI_EINVAL ); |
| return VG_(do_syscall3)(__NR_read, fd, (UWord)buf, count ); |
| } |
| |
| /* Create and open (-rw------) a tmp file name incorporating said arg. |
| Returns -1 on failure, else the fd of the file. If fullname is |
| non-NULL, the file's name is written into it. The number of bytes |
| written is guaranteed not to exceed 64+strlen(part_of_name). */ |
| |
| Int VG_(mkstemp) ( HChar* part_of_name, /*OUT*/HChar* fullname ) |
| { |
| HChar buf[200]; |
| Int n, tries, fd; |
| UInt seed; |
| SysRes sres; |
| |
| vg_assert(part_of_name); |
| n = VG_(strlen)(part_of_name); |
| vg_assert(n > 0 && n < 100); |
| |
| seed = (VG_(getpid)() << 9) ^ VG_(getppid)(); |
| |
| tries = 0; |
| while (True) { |
| if (tries > 10) |
| return -1; |
| VG_(sprintf)( buf, "/tmp/valgrind_%s_%08x", |
| part_of_name, VG_(random)( &seed )); |
| if (0) |
| VG_(printf)("VG_(mkstemp): trying: %s\n", buf); |
| |
| sres = VG_(open)(buf, |
| VKI_O_CREAT|VKI_O_RDWR|VKI_O_EXCL|VKI_O_TRUNC, |
| VKI_S_IRUSR|VKI_S_IWUSR); |
| if (sres.isError) |
| continue; |
| /* VG_(safe_fd) doesn't return if it fails. */ |
| fd = VG_(safe_fd)( sres.val ); |
| if (fullname) |
| VG_(strcpy)( fullname, buf ); |
| return fd; |
| } |
| /* NOTREACHED */ |
| } |
| |
| |
| /* --------------------------------------------------------------------- |
| Socket-related stuff. This is very Linux-kernel specific. |
| ------------------------------------------------------------------ */ |
| |
| static |
| Int parse_inet_addr_and_port ( UChar* str, UInt* ip_addr, UShort* port ); |
| |
| static |
| Int my_socket ( Int domain, Int type, Int protocol ); |
| |
| static |
| Int my_connect ( Int sockfd, struct vki_sockaddr_in* serv_addr, |
| Int addrlen ); |
| |
| static |
| UInt my_htonl ( UInt x ) |
| { |
| # if defined(VG_BIGENDIAN) |
| return x; |
| # else |
| return |
| (((x >> 24) & 0xFF) << 0) | (((x >> 16) & 0xFF) << 8) |
| | (((x >> 8) & 0xFF) << 16) | (((x >> 0) & 0xFF) << 24); |
| # endif |
| } |
| |
| static |
| UShort my_htons ( UShort x ) |
| { |
| # if defined(VG_BIGENDIAN) |
| return x; |
| # else |
| return |
| (((x >> 8) & 0xFF) << 0) | (((x >> 0) & 0xFF) << 8); |
| # endif |
| } |
| |
| |
| /* The main function. |
| |
| Supplied string contains either an ip address "192.168.0.1" or |
| an ip address and port pair, "192.168.0.1:1500". Parse these, |
| and return: |
| -1 if there is a parse error |
| -2 if no parse error, but specified host:port cannot be opened |
| the relevant file (socket) descriptor, otherwise. |
| is used. |
| */ |
| Int VG_(connect_via_socket)( UChar* str ) |
| { |
| Int sd, res; |
| struct vki_sockaddr_in servAddr; |
| UInt ip = 0; |
| UShort port = VG_CLO_DEFAULT_LOGPORT; |
| Bool ok = parse_inet_addr_and_port(str, &ip, &port); |
| if (!ok) |
| return -1; |
| |
| //if (0) |
| // VG_(printf)("ip = %d.%d.%d.%d, port %d\n", |
| // (ip >> 24) & 0xFF, (ip >> 16) & 0xFF, |
| // (ip >> 8) & 0xFF, ip & 0xFF, |
| // (UInt)port ); |
| |
| servAddr.sin_family = VKI_AF_INET; |
| servAddr.sin_addr.s_addr = my_htonl(ip); |
| servAddr.sin_port = my_htons(port); |
| |
| /* create socket */ |
| sd = my_socket(VKI_AF_INET, VKI_SOCK_STREAM, 0 /* IPPROTO_IP ? */); |
| if (sd < 0) { |
| /* this shouldn't happen ... nevertheless */ |
| return -2; |
| } |
| |
| /* connect to server */ |
| res = my_connect(sd, (struct vki_sockaddr_in *) &servAddr, |
| sizeof(servAddr)); |
| if (res < 0) { |
| /* connection failed */ |
| return -2; |
| } |
| |
| return sd; |
| } |
| |
| |
| /* Let d = one or more digits. Accept either: |
| d.d.d.d or d.d.d.d:d |
| */ |
| Int parse_inet_addr_and_port ( UChar* str, UInt* ip_addr, UShort* port ) |
| { |
| # define GET_CH ((*str) ? (*str++) : 0) |
| UInt ipa, i, j, c, any; |
| ipa = 0; |
| for (i = 0; i < 4; i++) { |
| j = 0; |
| any = 0; |
| while (1) { |
| c = GET_CH; |
| if (c < '0' || c > '9') break; |
| j = 10 * j + (int)(c - '0'); |
| any = 1; |
| } |
| if (any == 0 || j > 255) goto syntaxerr; |
| ipa = (ipa << 8) + j; |
| if (i <= 2 && c != '.') goto syntaxerr; |
| } |
| if (c == 0 || c == ':') |
| *ip_addr = ipa; |
| if (c == 0) goto ok; |
| if (c != ':') goto syntaxerr; |
| j = 0; |
| any = 0; |
| while (1) { |
| c = GET_CH; |
| if (c < '0' || c > '9') break; |
| j = j * 10 + (int)(c - '0'); |
| any = 1; |
| if (j > 65535) goto syntaxerr; |
| } |
| if (any == 0 || c != 0) goto syntaxerr; |
| if (j < 1024) goto syntaxerr; |
| *port = (UShort)j; |
| ok: |
| return 1; |
| syntaxerr: |
| return 0; |
| # undef GET_CH |
| } |
| |
| static |
| Int my_socket ( Int domain, Int type, Int protocol ) |
| { |
| #if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) |
| SysRes res; |
| UWord args[3]; |
| args[0] = domain; |
| args[1] = type; |
| args[2] = protocol; |
| res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_SOCKET, (UWord)&args); |
| return res.isError ? -1 : res.val; |
| |
| #elif defined(VGP_amd64_linux) |
| SysRes res; |
| res = VG_(do_syscall3)(__NR_socket, domain, type, protocol ); |
| return res.isError ? -1 : res.val; |
| |
| #else |
| # error Unknown arch |
| #endif |
| } |
| |
| static |
| Int my_connect ( Int sockfd, struct vki_sockaddr_in* serv_addr, |
| Int addrlen ) |
| { |
| #if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) |
| SysRes res; |
| UWord args[3]; |
| args[0] = sockfd; |
| args[1] = (UWord)serv_addr; |
| args[2] = addrlen; |
| res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_CONNECT, (UWord)&args); |
| return res.isError ? -1 : res.val; |
| |
| #elif defined(VGP_amd64_linux) |
| SysRes res; |
| res = VG_(do_syscall3)(__NR_connect, sockfd, (UWord)serv_addr, addrlen); |
| return res.isError ? -1 : res.val; |
| |
| #else |
| # error Unknown arch |
| #endif |
| } |
| |
| Int VG_(write_socket)( Int sd, void *msg, Int count ) |
| { |
| /* This is actually send(). */ |
| /* Requests not to send SIGPIPE on errors on stream oriented |
| sockets when the other end breaks the connection. The EPIPE |
| error is still returned. */ |
| Int flags = VKI_MSG_NOSIGNAL; |
| |
| #if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) |
| SysRes res; |
| UWord args[4]; |
| args[0] = sd; |
| args[1] = (UWord)msg; |
| args[2] = count; |
| args[3] = flags; |
| res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_SEND, (UWord)&args); |
| return res.isError ? -1 : res.val; |
| |
| #elif defined(VGP_amd64_linux) |
| SysRes res; |
| res = VG_(do_syscall6)(__NR_sendto, sd, (UWord)msg, count, flags, 0,0); |
| return res.isError ? -1 : res.val; |
| |
| #else |
| # error Unknown arch |
| #endif |
| } |
| |
| Int VG_(getsockname) ( Int sd, struct vki_sockaddr *name, Int *namelen) |
| { |
| SysRes res; |
| |
| #if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) |
| UWord args[3]; |
| args[0] = sd; |
| args[1] = (UWord)name; |
| args[2] = (UWord)namelen; |
| res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_GETSOCKNAME, (UWord)&args); |
| return res.isError ? -1 : res.val; |
| |
| #elif defined(VGP_amd64_linux) |
| res = VG_(do_syscall3)( __NR_getsockname, |
| (UWord)sd, (UWord)name, (UWord)namelen ); |
| return res.isError ? -1 : res.val; |
| |
| #else |
| # error Unknown arch |
| #endif |
| } |
| |
| Int VG_(getpeername) ( Int sd, struct vki_sockaddr *name, Int *namelen) |
| { |
| SysRes res; |
| |
| #if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) |
| UWord args[3]; |
| args[0] = sd; |
| args[1] = (UWord)name; |
| args[2] = (UWord)namelen; |
| res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_GETPEERNAME, (UWord)&args); |
| return res.isError ? -1 : res.val; |
| |
| #elif defined(VGP_amd64_linux) |
| res = VG_(do_syscall3)( __NR_getpeername, |
| (UWord)sd, (UWord)name, (UWord)namelen ); |
| return res.isError ? -1 : res.val; |
| |
| #else |
| # error Unknown archx |
| #endif |
| } |
| |
| Int VG_(getsockopt) ( Int sd, Int level, Int optname, void *optval, |
| Int *optlen) |
| { |
| SysRes res; |
| |
| #if defined(VGP_x86_linux) || defined(VGP_ppc32_linux) |
| UWord args[5]; |
| args[0] = sd; |
| args[1] = level; |
| args[2] = optname; |
| args[3] = (UWord)optval; |
| args[4] = (UWord)optlen; |
| res = VG_(do_syscall2)(__NR_socketcall, VKI_SYS_GETSOCKOPT, (UWord)&args); |
| return res.isError ? -1 : res.val; |
| |
| #elif defined(VGP_amd64_linux) |
| res = VG_(do_syscall5)( __NR_getsockopt, |
| (UWord)sd, (UWord)level, (UWord)optname, |
| (UWord)optval, (UWord)optlen ); |
| return res.isError ? -1 : res.val; |
| |
| #else |
| # error Unknown arch |
| #endif |
| } |
| |
| |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |
| |