diff options
Diffstat (limited to 'libkdenetwork/libgpgme-copy/assuan/assuan-pipe-connect.c')
| -rw-r--r-- | libkdenetwork/libgpgme-copy/assuan/assuan-pipe-connect.c | 889 |
1 files changed, 889 insertions, 0 deletions
diff --git a/libkdenetwork/libgpgme-copy/assuan/assuan-pipe-connect.c b/libkdenetwork/libgpgme-copy/assuan/assuan-pipe-connect.c new file mode 100644 index 000000000..8ee9c748b --- /dev/null +++ b/libkdenetwork/libgpgme-copy/assuan/assuan-pipe-connect.c @@ -0,0 +1,889 @@ +/* assuan-pipe-connect.c - Establish a pipe connection (client) + * Copyright (C) 2001, 2002, 2003, 2005, 2006 Free Software Foundation, Inc. + * + * This file is part of Assuan. + * + * Assuan is free software; you can redistribute it and/or modify it + * under the terms of the GNU Lesser General Public License as + * published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * Assuan 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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <signal.h> +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> +#include <sys/types.h> +#ifndef HAVE_W32_SYSTEM +#include <sys/wait.h> +#else +#include <windows.h> +#endif + +#include "assuan-defs.h" + +/* Hacks for Slowaris. */ +#ifndef PF_LOCAL +# ifdef PF_UNIX +# define PF_LOCAL PF_UNIX +# else +# define PF_LOCAL AF_UNIX +# endif +#endif +#ifndef AF_LOCAL +# define AF_LOCAL AF_UNIX +#endif + + +#ifdef _POSIX_OPEN_MAX +#define MAX_OPEN_FDS _POSIX_OPEN_MAX +#else +#define MAX_OPEN_FDS 20 +#endif + +#ifdef HAVE_W32_SYSTEM +/* We assume that a HANDLE can be represented by an int which should + be true for all i386 systems (HANDLE is defined as void *) and + these are the only systems for which Windows is available. Further + we assume that -1 denotes an invalid handle. */ +#define fd_to_handle(a) ((HANDLE)(a)) +#define handle_to_fd(a) ((int)(a)) +#define pid_to_handle(a) ((HANDLE)(a)) +#define handle_to_pid(a) ((int)(a)) +#endif /*HAVE_W32_SYSTEM*/ + + +/* This should be called to make sure that SIGPIPE gets ignored. */ +static void +fix_signals (void) +{ +#ifndef _ASSUAN_NO_FIXED_SIGNALS +#ifndef HAVE_DOSISH_SYSTEM /* No SIGPIPE for these systems. */ + static int fixed_signals; + + if (!fixed_signals) + { + struct sigaction act; + + sigaction (SIGPIPE, NULL, &act); + if (act.sa_handler == SIG_DFL) + { + act.sa_handler = SIG_IGN; + sigemptyset (&act.sa_mask); + act.sa_flags = 0; + sigaction (SIGPIPE, &act, NULL); + } + fixed_signals = 1; + /* FIXME: This is not MT safe */ + } +#endif /*HAVE_DOSISH_SYSTEM*/ +#endif /*!_ASSUAN_NO_FIXED_SIGNALS*/ +} + + +#ifndef HAVE_W32_SYSTEM +static int +writen (int fd, const char *buffer, size_t length) +{ + while (length) + { + int nwritten = write (fd, buffer, length); + + if (nwritten < 0) + { + if (errno == EINTR) + continue; + return -1; /* write error */ + } + length -= nwritten; + buffer += nwritten; + } + return 0; /* okay */ +} +#endif + +static int +do_finish (assuan_context_t ctx) +{ + if (ctx->inbound.fd != -1) + { + _assuan_close (ctx->inbound.fd); + if (ctx->inbound.fd == ctx->outbound.fd) + ctx->outbound.fd = -1; + ctx->inbound.fd = -1; + } + if (ctx->outbound.fd != -1) + { + _assuan_close (ctx->outbound.fd); + ctx->outbound.fd = -1; + } + if (ctx->pid != -1 && ctx->pid) + { +#ifndef HAVE_W32_SYSTEM +#ifndef _ASSUAN_USE_DOUBLE_FORK + if (!ctx->flags.no_waitpid) + _assuan_waitpid (ctx->pid, NULL, 0); + ctx->pid = -1; +#endif +#endif /*!HAVE_W32_SYSTEM*/ + } + return 0; +} + +static void +do_deinit (assuan_context_t ctx) +{ + do_finish (ctx); +} + + +/* Helper for pipe_connect. */ +static assuan_error_t +initial_handshake (assuan_context_t *ctx) +{ + int okay, off; + assuan_error_t err; + + err = _assuan_read_from_server (*ctx, &okay, &off); + if (err) + _assuan_log_printf ("can't connect server: %s\n", + assuan_strerror (err)); + else if (okay != 1) + { + _assuan_log_printf ("can't connect server: `%s'\n", + (*ctx)->inbound.line); + err = _assuan_error (ASSUAN_Connect_Failed); + } + + if (err) + { + assuan_disconnect (*ctx); + *ctx = NULL; + } + return err; +} + + +#ifndef HAVE_W32_SYSTEM +#define pipe_connect pipe_connect_unix +/* Unix version of the pipe connection code. We use an extra macro to + make ChangeLog entries easier. */ +static assuan_error_t +pipe_connect_unix (assuan_context_t *ctx, + const char *name, const char *const argv[], + int *fd_child_list, + void (*atfork) (void *opaque, int reserved), + void *atforkvalue) +{ + assuan_error_t err; + int rp[2]; + int wp[2]; + char mypidstr[50]; + + if (!ctx || !name || !argv || !argv[0]) + return _assuan_error (ASSUAN_Invalid_Value); + + fix_signals (); + + sprintf (mypidstr, "%lu", (unsigned long)getpid ()); + + if (pipe (rp) < 0) + return _assuan_error (ASSUAN_General_Error); + + if (pipe (wp) < 0) + { + close (rp[0]); + close (rp[1]); + return _assuan_error (ASSUAN_General_Error); + } + + err = _assuan_new_context (ctx); + if (err) + { + close (rp[0]); + close (rp[1]); + close (wp[0]); + close (wp[1]); + return err; + } + (*ctx)->pipe_mode = 1; + (*ctx)->inbound.fd = rp[0]; /* Our inbound is read end of read pipe. */ + (*ctx)->outbound.fd = wp[1]; /* Our outbound is write end of write pipe. */ + (*ctx)->deinit_handler = do_deinit; + (*ctx)->finish_handler = do_finish; + + /* FIXME: For GPGME we should better use _gpgme_io_spawn. The PID + stored here is actually soon useless. */ + (*ctx)->pid = fork (); + if ((*ctx)->pid < 0) + { + close (rp[0]); + close (rp[1]); + close (wp[0]); + close (wp[1]); + _assuan_release_context (*ctx); + return _assuan_error (ASSUAN_General_Error); + } + + if ((*ctx)->pid == 0) + { +#ifdef _ASSUAN_USE_DOUBLE_FORK + pid_t pid; + + if ((pid = fork ()) == 0) +#endif + { + int i, n; + char errbuf[512]; + int *fdp; + + if (atfork) + atfork (atforkvalue, 0); + + /* Dup handles to stdin/stdout. */ + if (rp[1] != STDOUT_FILENO) + { + if (dup2 (rp[1], STDOUT_FILENO) == -1) + { + _assuan_log_printf ("dup2 failed in child: %s\n", + strerror (errno)); + _exit (4); + } + } + if (wp[0] != STDIN_FILENO) + { + if (dup2 (wp[0], STDIN_FILENO) == -1) + { + _assuan_log_printf ("dup2 failed in child: %s\n", + strerror (errno)); + _exit (4); + } + } + + /* Dup stderr to /dev/null unless it is in the list of FDs to be + passed to the child. */ + fdp = fd_child_list; + if (fdp) + { + for (; *fdp != -1 && *fdp != STDERR_FILENO; fdp++) + ; + } + if (!fdp || *fdp == -1) + { + int fd = open ("/dev/null", O_WRONLY); + if (fd == -1) + { + _assuan_log_printf ("can't open `/dev/null': %s\n", + strerror (errno)); + _exit (4); + } + if (dup2 (fd, STDERR_FILENO) == -1) + { + _assuan_log_printf ("dup2(dev/null, 2) failed: %s\n", + strerror (errno)); + _exit (4); + } + } + + + /* Close all files which will not be duped and are not in the + fd_child_list. */ + n = sysconf (_SC_OPEN_MAX); + if (n < 0) + n = MAX_OPEN_FDS; + for (i=0; i < n; i++) + { + if ( i == STDIN_FILENO || i == STDOUT_FILENO + || i == STDERR_FILENO) + continue; + fdp = fd_child_list; + if (fdp) + { + while (*fdp != -1 && *fdp != i) + fdp++; + } + + if (!(fdp && *fdp != -1)) + close(i); + } + errno = 0; + + /* We store our parents pid in the environment so that the + execed assuan server is able to read the actual pid of the + client. The server can't use getppid because it might have + been double forked before the assuan server has been + initialized. */ + setenv ("_assuan_pipe_connect_pid", mypidstr, 1); + + /* Make sure that we never pass a connection fd variable + when using a simple pipe. */ + unsetenv ("_assuan_connection_fd"); + + execv (name, (char *const *) argv); + /* oops - use the pipe to tell the parent about it */ + snprintf (errbuf, sizeof(errbuf)-1, + "ERR %d can't exec `%s': %.50s\n", + _assuan_error (ASSUAN_Problem_Starting_Server), + name, strerror (errno)); + errbuf[sizeof(errbuf)-1] = 0; + writen (1, errbuf, strlen (errbuf)); + _exit (4); + } +#ifdef _ASSUAN_USE_DOUBLE_FORK + if (pid == -1) + _exit (1); + else + _exit (0); +#endif + } + +#ifdef _ASSUAN_USE_DOUBLE_FORK + _assuan_waitpid ((*ctx)->pid, NULL, 0); + (*ctx)->pid = -1; +#endif + + close (rp[1]); + close (wp[0]); + + return initial_handshake (ctx); +} +#endif /*!HAVE_W32_SYSTEM*/ + + +#ifndef HAVE_W32_SYSTEM +/* This function is similar to pipe_connect but uses a socketpair and + sets the I/O up to use sendmsg/recvmsg. */ +static assuan_error_t +socketpair_connect (assuan_context_t *ctx, + const char *name, const char *const argv[], + int *fd_child_list, + void (*atfork) (void *opaque, int reserved), + void *atforkvalue) +{ + assuan_error_t err; + int fds[2]; + char mypidstr[50]; + + if (!ctx + || (name && (!argv || !argv[0])) + || (!name && argv)) + return _assuan_error (ASSUAN_Invalid_Value); + + fix_signals (); + + sprintf (mypidstr, "%lu", (unsigned long)getpid ()); + + if ( socketpair (AF_LOCAL, SOCK_STREAM, 0, fds) ) + { + _assuan_log_printf ("socketpair failed: %s\n", strerror (errno)); + return _assuan_error (ASSUAN_General_Error); + } + + err = _assuan_new_context (ctx); + if (err) + { + close (fds[0]); + close (fds[1]); + return err; + } + (*ctx)->pipe_mode = 1; + (*ctx)->inbound.fd = fds[0]; + (*ctx)->outbound.fd = fds[0]; + _assuan_init_uds_io (*ctx); + (*ctx)->deinit_handler = _assuan_uds_deinit; + (*ctx)->finish_handler = do_finish; + + (*ctx)->pid = fork (); + if ((*ctx)->pid < 0) + { + close (fds[0]); + close (fds[1]); + _assuan_release_context (*ctx); + *ctx = NULL; + return _assuan_error (ASSUAN_General_Error); + } + + if ((*ctx)->pid == 0) + { +#ifdef _ASSUAN_USE_DOUBLE_FORK + pid_t pid; + + if ((pid = fork ()) == 0) +#endif + { + int fd, i, n; + char errbuf[512]; + int *fdp; + + if (atfork) + atfork (atforkvalue, 0); + + /* Connect stdin and stdout to /dev/null. */ + fd = open ("/dev/null", O_RDONLY); + if (fd == -1 || dup2 (fd, STDIN_FILENO) == -1) + { + _assuan_log_printf ("dup2(dev/null) failed: %s\n", + strerror (errno)); + _exit (4); + } + fd = open ("/dev/null", O_WRONLY); + if (fd == -1 || dup2 (fd, STDOUT_FILENO) == -1) + { + _assuan_log_printf ("dup2(dev/null) failed: %s\n", + strerror (errno)); + _exit (4); + } + + /* Dup stderr to /dev/null unless it is in the list of FDs to be + passed to the child. */ + fdp = fd_child_list; + if (fdp) + { + for (; *fdp != -1 && *fdp != STDERR_FILENO; fdp++) + ; + } + if (!fdp || *fdp == -1) + { + fd = open ("/dev/null", O_WRONLY); + if (fd == -1 || dup2 (fd, STDERR_FILENO) == -1) + { + _assuan_log_printf ("dup2(dev/null) failed: %s\n", + strerror (errno)); + _exit (4); + } + } + + + /* Close all files which will not be duped, are not in the + fd_child_list and are not the connection fd. */ + n = sysconf (_SC_OPEN_MAX); + if (n < 0) + n = MAX_OPEN_FDS; + for (i=0; i < n; i++) + { + if ( i == STDIN_FILENO || i == STDOUT_FILENO + || i == STDERR_FILENO || i == fds[1]) + continue; + fdp = fd_child_list; + if (fdp) + { + while (*fdp != -1 && *fdp != i) + fdp++; + } + + if (!(fdp && *fdp != -1)) + close(i); + } + errno = 0; + + /* We store our parents pid in the environment so that the + execed assuan server is able to read the actual pid of the + client. The server can't use getppid becuase it might have + been double forked before the assuan server has been + initialized. */ + setenv ("_assuan_pipe_connect_pid", mypidstr, 1); + + /* Now set the environment variable used to convey the + connection's file descriptor. */ + sprintf (mypidstr, "%d", fds[1]); + if (setenv ("_assuan_connection_fd", mypidstr, 1)) + { + _assuan_log_printf ("setenv failed: %s\n", strerror (errno)); + _exit (4); + } + + if (!name && !argv) + { + /* No name and no args given, thus we don't do an exec + but continue the forked process. */ + _assuan_release_context (*ctx); + *ctx = NULL; + return 0; + } + + execv (name, (char *const *) argv); + /* oops - use the pipe to tell the parent about it */ + snprintf (errbuf, sizeof(errbuf)-1, + "ERR %d can't exec `%s': %.50s\n", + _assuan_error (ASSUAN_Problem_Starting_Server), + name, strerror (errno)); + errbuf[sizeof(errbuf)-1] = 0; + writen (fds[1], errbuf, strlen (errbuf)); + _exit (4); + } +#ifdef _ASSUAN_USE_DOUBLE_FORK + if (pid == -1) + _exit (1); + else + _exit (0); +#endif + } + + +#ifdef _ASSUAN_USE_DOUBLE_FORK + _assuan_waitpid ((*ctx)->pid, NULL, 0); + (*ctx)->pid = -1; +#endif + + close (fds[1]); + + return initial_handshake (ctx); +} +#endif /*!HAVE_W32_SYSTEM*/ + + + +#ifdef HAVE_W32_SYSTEM +/* Build a command line for use with W32's CreateProcess. On success + CMDLINE gets the address of a newly allocated string. */ +static int +build_w32_commandline (char * const *argv, char **cmdline) +{ + int i, n; + const char *s; + char *buf, *p; + + *cmdline = NULL; + n = 0; + for (i=0; (s=argv[i]); i++) + { + n += strlen (s) + 1 + 2; /* (1 space, 2 quoting */ + for (; *s; s++) + if (*s == '\"') + n++; /* Need to double inner quotes. */ + } + n++; + + buf = p = xtrymalloc (n); + if (!buf) + return -1; + + for (i=0; argv[i]; i++) + { + if (i) + p = stpcpy (p, " "); + if (!*argv[i]) /* Empty string. */ + p = stpcpy (p, "\"\""); + else if (strpbrk (argv[i], " \t\n\v\f\"")) + { + p = stpcpy (p, "\""); + for (s=argv[i]; *s; s++) + { + *p++ = *s; + if (*s == '\"') + *p++ = *s; + } + *p++ = '\"'; + *p = 0; + } + else + p = stpcpy (p, argv[i]); + } + + *cmdline= buf; + return 0; +} +#endif /*HAVE_W32_SYSTEM*/ + + +#ifdef HAVE_W32_SYSTEM +/* Create pipe where one end end is inheritable. */ +static int +create_inheritable_pipe (int filedes[2], int for_write) +{ + HANDLE r, w, h; + SECURITY_ATTRIBUTES sec_attr; + + memset (&sec_attr, 0, sizeof sec_attr ); + sec_attr.nLength = sizeof sec_attr; + sec_attr.bInheritHandle = FALSE; + + if (!CreatePipe (&r, &w, &sec_attr, 0)) + { + _assuan_log_printf ("CreatePipe failed: %s\n", w32_strerror (-1)); + return -1; + } + + if (!DuplicateHandle (GetCurrentProcess(), for_write? r : w, + GetCurrentProcess(), &h, 0, + TRUE, DUPLICATE_SAME_ACCESS )) + { + _assuan_log_printf ("DuplicateHandle failed: %s\n", w32_strerror (-1)); + CloseHandle (r); + CloseHandle (w); + return -1; + } + if (for_write) + { + CloseHandle (r); + r = h; + } + else + { + CloseHandle (w); + w = h; + } + + filedes[0] = handle_to_fd (r); + filedes[1] = handle_to_fd (w); + return 0; +} +#endif /*HAVE_W32_SYSTEM*/ + + +#ifdef HAVE_W32_SYSTEM +#define pipe_connect pipe_connect_w32 +/* W32 version of the pipe connection code. */ +static assuan_error_t +pipe_connect_w32 (assuan_context_t *ctx, + const char *name, const char *const argv[], + int *fd_child_list, + void (*atfork) (void *opaque, int reserved), + void *atforkvalue) +{ + assuan_error_t err; + int rp[2]; + int wp[2]; + char mypidstr[50]; + char *cmdline; + SECURITY_ATTRIBUTES sec_attr; + PROCESS_INFORMATION pi = + { + NULL, /* Returns process handle. */ + 0, /* Returns primary thread handle. */ + 0, /* Returns pid. */ + 0 /* Returns tid. */ + }; + STARTUPINFO si; + int fd, *fdp; + HANDLE nullfd = INVALID_HANDLE_VALUE; + + if (!ctx || !name || !argv || !argv[0]) + return _assuan_error (ASSUAN_Invalid_Value); + + fix_signals (); + + sprintf (mypidstr, "%lu", (unsigned long)getpid ()); + + /* Build the command line. */ + if (build_w32_commandline (argv, &cmdline)) + return _assuan_error (ASSUAN_Out_Of_Core); + + /* Create thew two pipes. */ + if (create_inheritable_pipe (rp, 0)) + { + xfree (cmdline); + return _assuan_error (ASSUAN_General_Error); + } + + if (create_inheritable_pipe (wp, 1)) + { + CloseHandle (fd_to_handle (rp[0])); + CloseHandle (fd_to_handle (rp[1])); + xfree (cmdline); + return _assuan_error (ASSUAN_General_Error); + } + + + err = _assuan_new_context (ctx); + if (err) + { + CloseHandle (fd_to_handle (rp[0])); + CloseHandle (fd_to_handle (rp[1])); + CloseHandle (fd_to_handle (wp[0])); + CloseHandle (fd_to_handle (wp[1])); + xfree (cmdline); + return _assuan_error (ASSUAN_General_Error); + } + + (*ctx)->pipe_mode = 1; + (*ctx)->inbound.fd = rp[0]; /* Our inbound is read end of read pipe. */ + (*ctx)->outbound.fd = wp[1]; /* Our outbound is write end of write pipe. */ + (*ctx)->deinit_handler = do_deinit; + (*ctx)->finish_handler = do_finish; + + + /* fixme: Actually we should set the "_assuan_pipe_connect_pid" env + variable. However this requires us to write a full environment + handler, because the strings are expected in sorted order. The + suggestion given in the MS Reference Library, to save the old + value, changeit, create proces and restore it, is not thread + safe. */ + + /* Start the process. */ + memset (&sec_attr, 0, sizeof sec_attr ); + sec_attr.nLength = sizeof sec_attr; + sec_attr.bInheritHandle = FALSE; + + memset (&si, 0, sizeof si); + si.cb = sizeof (si); + si.dwFlags = STARTF_USESTDHANDLES; + si.hStdInput = fd_to_handle (wp[0]); + si.hStdOutput = fd_to_handle (rp[1]); + + /* Dup stderr to /dev/null unless it is in the list of FDs to be + passed to the child. */ + fd = fileno (stderr); + fdp = fd_child_list; + if (fdp) + { + for (; *fdp != -1 && *fdp != fd; fdp++) + ; + } + if (!fdp || *fdp == -1) + { + nullfd = CreateFile ("nul", GENERIC_WRITE, + FILE_SHARE_READ | FILE_SHARE_WRITE, + NULL, OPEN_EXISTING, 0, NULL); + if (nullfd == INVALID_HANDLE_VALUE) + { + _assuan_log_printf ("can't open `nul': %s\n", w32_strerror (-1)); + CloseHandle (fd_to_handle (rp[0])); + CloseHandle (fd_to_handle (rp[1])); + CloseHandle (fd_to_handle (wp[0])); + CloseHandle (fd_to_handle (wp[1])); + xfree (cmdline); + _assuan_release_context (*ctx); + return -1; + } + si.hStdError = nullfd; + } + else + si.hStdError = fd_to_handle (_get_osfhandle (fd)); + + + /* Note: We inherit all handles flagged as inheritable. This seems + to be a security flaw but there seems to be no way of selecting + handles to inherit. */ + /* _assuan_log_printf ("CreateProcess, path=`%s' cmdline=`%s'\n", */ + /* name, cmdline); */ + if (!CreateProcess (name, /* Program to start. */ + cmdline, /* Command line arguments. */ + &sec_attr, /* Process security attributes. */ + &sec_attr, /* Thread security attributes. */ + TRUE, /* Inherit handles. */ + (CREATE_DEFAULT_ERROR_MODE + | GetPriorityClass (GetCurrentProcess ()) + | CREATE_SUSPENDED), /* Creation flags. */ + NULL, /* Environment. */ + NULL, /* Use current drive/directory. */ + &si, /* Startup information. */ + &pi /* Returns process information. */ + )) + { + _assuan_log_printf ("CreateProcess failed: %s\n", w32_strerror (-1)); + CloseHandle (fd_to_handle (rp[0])); + CloseHandle (fd_to_handle (rp[1])); + CloseHandle (fd_to_handle (wp[0])); + CloseHandle (fd_to_handle (wp[1])); + if (nullfd != INVALID_HANDLE_VALUE) + CloseHandle (nullfd); + xfree (cmdline); + _assuan_release_context (*ctx); + return _assuan_error (ASSUAN_General_Error); + } + xfree (cmdline); + cmdline = NULL; + if (nullfd != INVALID_HANDLE_VALUE) + { + CloseHandle (nullfd); + nullfd = INVALID_HANDLE_VALUE; + } + + CloseHandle (fd_to_handle (rp[1])); + CloseHandle (fd_to_handle (wp[0])); + + /* _assuan_log_printf ("CreateProcess ready: hProcess=%p hThread=%p" */ + /* " dwProcessID=%d dwThreadId=%d\n", */ + /* pi.hProcess, pi.hThread, */ + /* (int) pi.dwProcessId, (int) pi.dwThreadId); */ + + ResumeThread (pi.hThread); + CloseHandle (pi.hThread); + (*ctx)->pid = 0; /* We don't use the PID. */ + CloseHandle (pi.hProcess); /* We don't need to wait for the process. */ + + return initial_handshake (ctx); +} +#endif /*HAVE_W32_SYSTEM*/ + + +/* Connect to a server over a pipe, creating the assuan context and + returning it in CTX. The server filename is NAME, the argument + vector in ARGV. FD_CHILD_LIST is a -1 terminated list of file + descriptors not to close in the child. */ +assuan_error_t +assuan_pipe_connect (assuan_context_t *ctx, const char *name, + const char *const argv[], int *fd_child_list) +{ + return pipe_connect (ctx, name, argv, fd_child_list, NULL, NULL); +} + + + +assuan_error_t +assuan_pipe_connect2 (assuan_context_t *ctx, + const char *name, const char *const argv[], + int *fd_child_list, + void (*atfork) (void *opaque, int reserved), + void *atforkvalue) +{ + return pipe_connect (ctx, name, argv, fd_child_list, atfork, atforkvalue); +} + + +/* Connect to a server over a full-duplex socket (i.e. created by + socketpair), creating the assuan context and returning it in CTX. + The server filename is NAME, the argument vector in ARGV. + FD_CHILD_LIST is a -1 terminated list of file descriptors not to + close in the child. ATFORK is called in the child right after the + fork; ATFORKVALUE is passed as the first argument and 0 is passed + as the second argument. The ATFORK function should only act if the + second value is 0. + + For now FLAGS may either take the value 0 to behave like + assuan_pipe_connect2 or 1 to enable the described full-duplex + socket behaviour. + + If NAME as well as ARGV are NULL, no exec is done but the same + process is continued. However all file descriptors are closed and + some special environment variables are set. To let the caller + detect whether the child or the parent continues, the child returns + a CTX of NULL. */ +assuan_error_t +assuan_pipe_connect_ext (assuan_context_t *ctx, + const char *name, const char *const argv[], + int *fd_child_list, + void (*atfork) (void *opaque, int reserved), + void *atforkvalue, unsigned int flags) +{ + if ((flags & 1)) + { +#ifdef HAVE_W32_SYSTEM + return _assuan_error (ASSUAN_Not_Implemented); +#else + return socketpair_connect (ctx, name, argv, fd_child_list, + atfork, atforkvalue); +#endif + } + else + return pipe_connect (ctx, name, argv, fd_child_list, atfork, atforkvalue); +} + |