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Diffstat (limited to 'source4/lib/system.c')
| -rw-r--r-- | source4/lib/system.c | 1114 |
1 files changed, 1114 insertions, 0 deletions
diff --git a/source4/lib/system.c b/source4/lib/system.c new file mode 100644 index 0000000000..bafe689a30 --- /dev/null +++ b/source4/lib/system.c @@ -0,0 +1,1114 @@ +/* + Unix SMB/CIFS implementation. + Samba system utilities + Copyright (C) Andrew Tridgell 1992-1998 + Copyright (C) Jeremy Allison 1998-2002 + + 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., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + +/* + The idea is that this file will eventually have wrappers around all + important system calls in samba. The aims are: + + - to enable easier porting by putting OS dependent stuff in here + + - to allow for hooks into other "pseudo-filesystems" + + - to allow easier integration of things like the japanese extensions + + - to support the philosophy of Samba to expose the features of + the OS within the SMB model. In general whatever file/printer/variable + expansions/etc make sense to the OS should be acceptable to Samba. +*/ + + + +/******************************************************************* + A wrapper for usleep in case we don't have one. +********************************************************************/ + +int sys_usleep(long usecs) +{ +#ifndef HAVE_USLEEP + struct timeval tval; +#endif + + /* + * We need this braindamage as the glibc usleep + * is not SPEC1170 complient... grumble... JRA. + */ + + if(usecs < 0 || usecs > 1000000) { + errno = EINVAL; + return -1; + } + +#if HAVE_USLEEP + usleep(usecs); + return 0; +#else /* HAVE_USLEEP */ + /* + * Fake it with select... + */ + tval.tv_sec = 0; + tval.tv_usec = usecs/1000; + select(0,NULL,NULL,NULL,&tval); + return 0; +#endif /* HAVE_USLEEP */ +} + +/******************************************************************* +A read wrapper that will deal with EINTR. +********************************************************************/ + +ssize_t sys_read(int fd, void *buf, size_t count) +{ + ssize_t ret; + + do { + ret = read(fd, buf, count); + } while (ret == -1 && errno == EINTR); + return ret; +} + +/******************************************************************* +A write wrapper that will deal with EINTR. +********************************************************************/ + +ssize_t sys_write(int fd, const void *buf, size_t count) +{ + ssize_t ret; + + do { + ret = write(fd, buf, count); + } while (ret == -1 && errno == EINTR); + return ret; +} + +/******************************************************************* +A send wrapper that will deal with EINTR. +********************************************************************/ + +ssize_t sys_send(int s, const void *msg, size_t len, int flags) +{ + ssize_t ret; + + do { + ret = send(s, msg, len, flags); + } while (ret == -1 && errno == EINTR); + return ret; +} + +/******************************************************************* +A sendto wrapper that will deal with EINTR. +********************************************************************/ + +ssize_t sys_sendto(int s, const void *msg, size_t len, int flags, const struct sockaddr *to, socklen_t tolen) +{ + ssize_t ret; + + do { + ret = sendto(s, msg, len, flags, to, tolen); + } while (ret == -1 && errno == EINTR); + return ret; +} + +/******************************************************************* +A recvfrom wrapper that will deal with EINTR. +********************************************************************/ + +ssize_t sys_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen) +{ + ssize_t ret; + + do { + ret = recvfrom(s, buf, len, flags, from, fromlen); + } while (ret == -1 && errno == EINTR); + return ret; +} + +/******************************************************************* +A fcntl wrapper that will deal with EINTR. +********************************************************************/ + +int sys_fcntl_ptr(int fd, int cmd, void *arg) +{ + int ret; + + do { + ret = fcntl(fd, cmd, arg); + } while (ret == -1 && errno == EINTR); + return ret; +} + +/******************************************************************* +A fcntl wrapper that will deal with EINTR. +********************************************************************/ + +int sys_fcntl_long(int fd, int cmd, long arg) +{ + int ret; + + do { + ret = fcntl(fd, cmd, arg); + } while (ret == -1 && errno == EINTR); + return ret; +} + +/******************************************************************* +A stat() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +int sys_stat(const char *fname,SMB_STRUCT_STAT *sbuf) +{ + int ret; +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_STAT64) + ret = stat64(fname, sbuf); +#else + ret = stat(fname, sbuf); +#endif + /* we always want directories to appear zero size */ + if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0; + return ret; +} + +/******************************************************************* + An fstat() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +int sys_fstat(int fd,SMB_STRUCT_STAT *sbuf) +{ + int ret; +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FSTAT64) + ret = fstat64(fd, sbuf); +#else + ret = fstat(fd, sbuf); +#endif + /* we always want directories to appear zero size */ + if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0; + return ret; +} + +/******************************************************************* + An lstat() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf) +{ + int ret; +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSTAT64) + ret = lstat64(fname, sbuf); +#else + ret = lstat(fname, sbuf); +#endif + /* we always want directories to appear zero size */ + if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0; + return ret; +} + +/******************************************************************* + An ftruncate() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +int sys_ftruncate(int fd, SMB_OFF_T offset) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FTRUNCATE64) + return ftruncate64(fd, offset); +#else + return ftruncate(fd, offset); +#endif +} + +/******************************************************************* + An lseek() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +SMB_OFF_T sys_lseek(int fd, SMB_OFF_T offset, int whence) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSEEK64) + return lseek64(fd, offset, whence); +#else + return lseek(fd, offset, whence); +#endif +} + +/******************************************************************* + An fseek() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +int sys_fseek(FILE *fp, SMB_OFF_T offset, int whence) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEK64) + return fseek64(fp, offset, whence); +#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEKO64) + return fseeko64(fp, offset, whence); +#else + return fseek(fp, offset, whence); +#endif +} + +/******************************************************************* + An ftell() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +SMB_OFF_T sys_ftell(FILE *fp) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELL64) + return (SMB_OFF_T)ftell64(fp); +#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELLO64) + return (SMB_OFF_T)ftello64(fp); +#else + return (SMB_OFF_T)ftell(fp); +#endif +} + +/******************************************************************* + A creat() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +int sys_creat(const char *path, mode_t mode) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_CREAT64) + return creat64(path, mode); +#else + /* + * If creat64 isn't defined then ensure we call a potential open64. + * JRA. + */ + return sys_open(path, O_WRONLY | O_CREAT | O_TRUNC, mode); +#endif +} + +/******************************************************************* + An open() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +int sys_open(const char *path, int oflag, mode_t mode) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OPEN64) + return open64(path, oflag, mode); +#else + return open(path, oflag, mode); +#endif +} + +/******************************************************************* + An fopen() wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +FILE *sys_fopen(const char *path, const char *type) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_FOPEN64) + return fopen64(path, type); +#else + return fopen(path, type); +#endif +} + +/******************************************************************* + A readdir wrapper that will deal with 64 bit filesizes. +********************************************************************/ + +SMB_STRUCT_DIRENT *sys_readdir(DIR *dirp) +{ +#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_READDIR64) + return readdir64(dirp); +#else + return readdir(dirp); +#endif +} + +/******************************************************************* +The wait() calls vary between systems +********************************************************************/ + +int sys_waitpid(pid_t pid,int *status,int options) +{ +#ifdef HAVE_WAITPID + return waitpid(pid,status,options); +#else /* HAVE_WAITPID */ + return wait4(pid, status, options, NULL); +#endif /* HAVE_WAITPID */ +} + +/******************************************************************* + System wrapper for getwd +********************************************************************/ + +char *sys_getwd(char *s) +{ + char *wd; +#ifdef HAVE_GETCWD + wd = (char *)getcwd(s, sizeof (pstring)); +#else + wd = (char *)getwd(s); +#endif + return wd; +} + +/******************************************************************* +system wrapper for link +********************************************************************/ + +int sys_link(const char *oldpath, const char *newpath) +{ +#ifndef HAVE_LINK + errno = ENOSYS; + return -1; +#else + return link(oldpath, newpath); +#endif +} + +/******************************************************************* +os/2 also doesn't have chroot +********************************************************************/ +int sys_chroot(const char *dname) +{ +#ifndef HAVE_CHROOT + static int done; + if (!done) { + DEBUG(1,("WARNING: no chroot!\n")); + done=1; + } + errno = ENOSYS; + return -1; +#else + return(chroot(dname)); +#endif +} + +/************************************************************************** +A wrapper for gethostbyname() that tries avoids looking up hostnames +in the root domain, which can cause dial-on-demand links to come up for no +apparent reason. +****************************************************************************/ + +struct hostent *sys_gethostbyname(const char *name) +{ +#ifdef REDUCE_ROOT_DNS_LOOKUPS + char query[256], hostname[256]; + char *domain; + + /* Does this name have any dots in it? If so, make no change */ + + if (strchr_m(name, '.')) + return(gethostbyname(name)); + + /* Get my hostname, which should have domain name + attached. If not, just do the gethostname on the + original string. + */ + + gethostname(hostname, sizeof(hostname) - 1); + hostname[sizeof(hostname) - 1] = 0; + if ((domain = strchr_m(hostname, '.')) == NULL) + return(gethostbyname(name)); + + /* Attach domain name to query and do modified query. + If names too large, just do gethostname on the + original string. + */ + + if((strlen(name) + strlen(domain)) >= sizeof(query)) + return(gethostbyname(name)); + + slprintf(query, sizeof(query)-1, "%s%s", name, domain); + return(gethostbyname(query)); +#else /* REDUCE_ROOT_DNS_LOOKUPS */ + return(gethostbyname(name)); +#endif /* REDUCE_ROOT_DNS_LOOKUPS */ +} + + +#if defined(HAVE_IRIX_SPECIFIC_CAPABILITIES) +/************************************************************************** + Try and abstract process capabilities (for systems that have them). +****************************************************************************/ +static BOOL set_process_capability( uint32 cap_flag, BOOL enable ) +{ + if(cap_flag == KERNEL_OPLOCK_CAPABILITY) { + cap_t cap = cap_get_proc(); + + if (cap == NULL) { + DEBUG(0,("set_process_capability: cap_get_proc failed. Error was %s\n", + strerror(errno))); + return False; + } + + if(enable) + cap->cap_effective |= CAP_NETWORK_MGT; + else + cap->cap_effective &= ~CAP_NETWORK_MGT; + + if (cap_set_proc(cap) == -1) { + DEBUG(0,("set_process_capability: cap_set_proc failed. Error was %s\n", + strerror(errno))); + cap_free(cap); + return False; + } + + cap_free(cap); + + DEBUG(10,("set_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n")); + } + return True; +} + +/************************************************************************** + Try and abstract inherited process capabilities (for systems that have them). +****************************************************************************/ + +static BOOL set_inherited_process_capability( uint32 cap_flag, BOOL enable ) +{ + if(cap_flag == KERNEL_OPLOCK_CAPABILITY) { + cap_t cap = cap_get_proc(); + + if (cap == NULL) { + DEBUG(0,("set_inherited_process_capability: cap_get_proc failed. Error was %s\n", + strerror(errno))); + return False; + } + + if(enable) + cap->cap_inheritable |= CAP_NETWORK_MGT; + else + cap->cap_inheritable &= ~CAP_NETWORK_MGT; + + if (cap_set_proc(cap) == -1) { + DEBUG(0,("set_inherited_process_capability: cap_set_proc failed. Error was %s\n", + strerror(errno))); + cap_free(cap); + return False; + } + + cap_free(cap); + + DEBUG(10,("set_inherited_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n")); + } + return True; +} +#endif + +/**************************************************************************** + Gain the oplock capability from the kernel if possible. +****************************************************************************/ + +void oplock_set_capability(BOOL this_process, BOOL inherit) +{ +#if HAVE_KERNEL_OPLOCKS_IRIX + set_process_capability(KERNEL_OPLOCK_CAPABILITY,this_process); + set_inherited_process_capability(KERNEL_OPLOCK_CAPABILITY,inherit); +#endif +} + +/************************************************************************** + Wrapper for random(). +****************************************************************************/ + +long sys_random(void) +{ +#if defined(HAVE_RANDOM) + return (long)random(); +#elif defined(HAVE_RAND) + return (long)rand(); +#else + DEBUG(0,("Error - no random function available !\n")); + exit(1); +#endif +} + +/************************************************************************** + Wrapper for srandom(). +****************************************************************************/ + +void sys_srandom(unsigned int seed) +{ +#if defined(HAVE_SRANDOM) + srandom(seed); +#elif defined(HAVE_SRAND) + srand(seed); +#else + DEBUG(0,("Error - no srandom function available !\n")); + exit(1); +#endif +} + +/************************************************************************** + Returns equivalent to NGROUPS_MAX - using sysconf if needed. +****************************************************************************/ + +int groups_max(void) +{ +#if defined(SYSCONF_SC_NGROUPS_MAX) + int ret = sysconf(_SC_NGROUPS_MAX); + return (ret == -1) ? NGROUPS_MAX : ret; +#else + return NGROUPS_MAX; +#endif +} + +/************************************************************************** + Wrapper for getgroups. Deals with broken (int) case. +****************************************************************************/ + +int sys_getgroups(int setlen, gid_t *gidset) +{ +#if !defined(HAVE_BROKEN_GETGROUPS) + return getgroups(setlen, gidset); +#else + + GID_T gid; + GID_T *group_list; + int i, ngroups; + + if(setlen == 0) { + return getgroups(setlen, &gid); + } + + /* + * Broken case. We need to allocate a + * GID_T array of size setlen. + */ + + if(setlen < 0) { + errno = EINVAL; + return -1; + } + + if (setlen == 0) + setlen = groups_max(); + + if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) { + DEBUG(0,("sys_getgroups: Malloc fail.\n")); + return -1; + } + + if((ngroups = getgroups(setlen, group_list)) < 0) { + int saved_errno = errno; + SAFE_FREE(group_list); + errno = saved_errno; + return -1; + } + + for(i = 0; i < ngroups; i++) + gidset[i] = (gid_t)group_list[i]; + + SAFE_FREE(group_list); + return ngroups; +#endif /* HAVE_BROKEN_GETGROUPS */ +} + +#ifdef HAVE_SETGROUPS + +/************************************************************************** + Wrapper for setgroups. Deals with broken (int) case. Automatically used + if we have broken getgroups. +****************************************************************************/ + +int sys_setgroups(int setlen, gid_t *gidset) +{ +#if !defined(HAVE_BROKEN_GETGROUPS) + return setgroups(setlen, gidset); +#else + + GID_T *group_list; + int i ; + + if (setlen == 0) + return 0 ; + + if (setlen < 0 || setlen > groups_max()) { + errno = EINVAL; + return -1; + } + + /* + * Broken case. We need to allocate a + * GID_T array of size setlen. + */ + + if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) { + DEBUG(0,("sys_setgroups: Malloc fail.\n")); + return -1; + } + + for(i = 0; i < setlen; i++) + group_list[i] = (GID_T) gidset[i]; + + if(setgroups(setlen, group_list) != 0) { + int saved_errno = errno; + SAFE_FREE(group_list); + errno = saved_errno; + return -1; + } + + SAFE_FREE(group_list); + return 0 ; +#endif /* HAVE_BROKEN_GETGROUPS */ +} + +#endif /* HAVE_SETGROUPS */ + +struct passwd *sys_getpwent(void) +{ + return getpwent(); +} + +void sys_endpwent(void) +{ + endpwent(); +} + +/************************************************************************** + Wrappers for getpwnam(), getpwuid(), getgrnam(), getgrgid() +****************************************************************************/ + +struct passwd *sys_getpwnam(const char *name) +{ + return getpwnam(name); +} + +struct passwd *sys_getpwuid(uid_t uid) +{ + return getpwuid(uid); +} + +struct group *sys_getgrnam(const char *name) +{ + return getgrnam(name); +} + +struct group *sys_getgrgid(gid_t gid) +{ + return getgrgid(gid); +} + +#if 0 /* NOT CURRENTLY USED - JRA */ +/************************************************************************** + The following are the UNICODE versions of *all* system interface functions + called within Samba. Ok, ok, the exceptions are the gethostbyXX calls, + which currently are left as ascii as they are not used other than in name + resolution. +****************************************************************************/ + +/************************************************************************** + Wide stat. Just narrow and call sys_xxx. +****************************************************************************/ + +int wsys_stat(const smb_ucs2_t *wfname,SMB_STRUCT_STAT *sbuf) +{ + pstring fname; + return sys_stat(unicode_to_unix(fname,wfname,sizeof(fname)), sbuf); +} + +/************************************************************************** + Wide lstat. Just narrow and call sys_xxx. +****************************************************************************/ + +int wsys_lstat(const smb_ucs2_t *wfname,SMB_STRUCT_STAT *sbuf) +{ + pstring fname; + return sys_lstat(unicode_to_unix(fname,wfname,sizeof(fname)), sbuf); +} + +/************************************************************************** + Wide creat. Just narrow and call sys_xxx. +****************************************************************************/ + +int wsys_creat(const smb_ucs2_t *wfname, mode_t mode) +{ + pstring fname; + return sys_creat(unicode_to_unix(fname,wfname,sizeof(fname)), mode); +} + +/************************************************************************** + Wide open. Just narrow and call sys_xxx. +****************************************************************************/ + +int wsys_open(const smb_ucs2_t *wfname, int oflag, mode_t mode) +{ + pstring fname; + return sys_open(unicode_to_unix(fname,wfname,sizeof(fname)), oflag, mode); +} + +/************************************************************************** + Wide fopen. Just narrow and call sys_xxx. +****************************************************************************/ + +FILE *wsys_fopen(const smb_ucs2_t *wfname, const char *type) +{ + pstring fname; + return sys_fopen(unicode_to_unix(fname,wfname,sizeof(fname)), type); +} + +/************************************************************************** + Wide opendir. Just narrow and call sys_xxx. +****************************************************************************/ + +DIR *wsys_opendir(const smb_ucs2_t *wfname) +{ + pstring fname; + return opendir(unicode_to_unix(fname,wfname,sizeof(fname))); +} + +/************************************************************************** + Wide readdir. Return a structure pointer containing a wide filename. +****************************************************************************/ + +SMB_STRUCT_WDIRENT *wsys_readdir(DIR *dirp) +{ + static SMB_STRUCT_WDIRENT retval; + SMB_STRUCT_DIRENT *dirval = sys_readdir(dirp); + + if(!dirval) + return NULL; + + /* + * The only POSIX defined member of this struct is d_name. + */ + + unix_to_unicode(retval.d_name,dirval->d_name,sizeof(retval.d_name)); + + return &retval; +} + +/************************************************************************** + Wide getwd. Call sys_xxx and widen. Assumes s points to a wpstring. +****************************************************************************/ + +smb_ucs2_t *wsys_getwd(smb_ucs2_t *s) +{ + pstring fname; + char *p = sys_getwd(fname); + + if(!p) + return NULL; + + return unix_to_unicode(s, p, sizeof(wpstring)); +} + +/************************************************************************** + Wide chown. Just narrow and call sys_xxx. +****************************************************************************/ + +int wsys_chown(const smb_ucs2_t *wfname, uid_t uid, gid_t gid) +{ + pstring fname; + return chown(unicode_to_unix(fname,wfname,sizeof(fname)), uid, gid); +} + +/************************************************************************** + Wide chroot. Just narrow and call sys_xxx. +****************************************************************************/ + +int wsys_chroot(const smb_ucs2_t *wfname) +{ + pstring fname; + return chroot(unicode_to_unix(fname,wfname,sizeof(fname))); +} + +/************************************************************************** + Wide getpwnam. Return a structure pointer containing wide names. +****************************************************************************/ + +SMB_STRUCT_WPASSWD *wsys_getpwnam(const smb_ucs2_t *wname) +{ + static SMB_STRUCT_WPASSWD retval; + fstring name; + struct passwd *pwret = sys_getpwnam(unicode_to_unix(name,wname,sizeof(name))); + + if(!pwret) + return NULL; + + unix_to_unicode(retval.pw_name, pwret->pw_name, sizeof(retval.pw_name)); + retval.pw_passwd = pwret->pw_passwd; + retval.pw_uid = pwret->pw_uid; + retval.pw_gid = pwret->pw_gid; + unix_to_unicode(retval.pw_gecos, pwret->pw_gecos, sizeof(retval.pw_gecos)); + unix_to_unicode(retval.pw_dir, pwret->pw_dir, sizeof(retval.pw_dir)); + unix_to_unicode(retval.pw_shell, pwret->pw_shell, sizeof(retval.pw_shell)); + + return &retval; +} + +/************************************************************************** + Wide getpwuid. Return a structure pointer containing wide names. +****************************************************************************/ + +SMB_STRUCT_WPASSWD *wsys_getpwuid(uid_t uid) +{ + static SMB_STRUCT_WPASSWD retval; + struct passwd *pwret = sys_getpwuid(uid); + + if(!pwret) + return NULL; + + unix_to_unicode(retval.pw_name, pwret->pw_name, sizeof(retval.pw_name)); + retval.pw_passwd = pwret->pw_passwd; + retval.pw_uid = pwret->pw_uid; + retval.pw_gid = pwret->pw_gid; + unix_to_unicode(retval.pw_gecos, pwret->pw_gecos, sizeof(retval.pw_gecos)); + unix_to_unicode(retval.pw_dir, pwret->pw_dir, sizeof(retval.pw_dir)); + unix_to_unicode(retval.pw_shell, pwret->pw_shell, sizeof(retval.pw_shell)); + + return &retval; +} +#endif /* NOT CURRENTLY USED - JRA */ + +/************************************************************************** + Extract a command into an arg list. Uses a static pstring for storage. + Caller frees returned arg list (which contains pointers into the static pstring). +****************************************************************************/ + +static char **extract_args(const char *command) +{ + static pstring trunc_cmd; + char *ptr; + int argcl; + char **argl = NULL; + int i; + + pstrcpy(trunc_cmd, command); + + if(!(ptr = strtok(trunc_cmd, " \t"))) { + errno = EINVAL; + return NULL; + } + + /* + * Count the args. + */ + + for( argcl = 1; ptr; ptr = strtok(NULL, " \t")) + argcl++; + + if((argl = (char **)malloc((argcl + 1) * sizeof(char *))) == NULL) + return NULL; + + /* + * Now do the extraction. + */ + + pstrcpy(trunc_cmd, command); + + ptr = strtok(trunc_cmd, " \t"); + i = 0; + argl[i++] = ptr; + + while((ptr = strtok(NULL, " \t")) != NULL) + argl[i++] = ptr; + + argl[i++] = NULL; + return argl; +} + +/************************************************************************** + Wrapper for popen. Safer as it doesn't search a path. + Modified from the glibc sources. + modified by tridge to return a file descriptor. We must kick our FILE* habit +****************************************************************************/ + +typedef struct _popen_list +{ + int fd; + pid_t child_pid; + struct _popen_list *next; +} popen_list; + +static popen_list *popen_chain; + +int sys_popen(const char *command) +{ + int parent_end, child_end; + int pipe_fds[2]; + popen_list *entry = NULL; + char **argl = NULL; + + if (pipe(pipe_fds) < 0) + return -1; + + parent_end = pipe_fds[0]; + child_end = pipe_fds[1]; + + if (!*command) { + errno = EINVAL; + goto err_exit; + } + + if((entry = (popen_list *)malloc(sizeof(popen_list))) == NULL) + goto err_exit; + + ZERO_STRUCTP(entry); + + /* + * Extract the command and args into a NULL terminated array. + */ + + if(!(argl = extract_args(command))) + goto err_exit; + + entry->child_pid = fork(); + + if (entry->child_pid == -1) { + goto err_exit; + } + + if (entry->child_pid == 0) { + + /* + * Child ! + */ + + int child_std_end = STDOUT_FILENO; + popen_list *p; + + close(parent_end); + if (child_end != child_std_end) { + dup2 (child_end, child_std_end); + close (child_end); + } + + /* + * POSIX.2: "popen() shall ensure that any streams from previous + * popen() calls that remain open in the parent process are closed + * in the new child process." + */ + + for (p = popen_chain; p; p = p->next) + close(p->fd); + + execv(argl[0], argl); + _exit (127); + } + + /* + * Parent. + */ + + close (child_end); + SAFE_FREE(argl); + + /* Link into popen_chain. */ + entry->next = popen_chain; + popen_chain = entry; + entry->fd = parent_end; + + return entry->fd; + +err_exit: + + SAFE_FREE(entry); + SAFE_FREE(argl); + close(pipe_fds[0]); + close(pipe_fds[1]); + return -1; +} + +/************************************************************************** + Wrapper for pclose. Modified from the glibc sources. +****************************************************************************/ + +int sys_pclose(int fd) +{ + int wstatus; + popen_list **ptr = &popen_chain; + popen_list *entry = NULL; + pid_t wait_pid; + int status = -1; + + /* Unlink from popen_chain. */ + for ( ; *ptr != NULL; ptr = &(*ptr)->next) { + if ((*ptr)->fd == fd) { + entry = *ptr; + *ptr = (*ptr)->next; + status = 0; + break; + } + } + + if (status < 0 || close(entry->fd) < 0) + return -1; + + /* + * As Samba is catching and eating child process + * exits we don't really care about the child exit + * code, a -1 with errno = ECHILD will do fine for us. + */ + + do { + wait_pid = sys_waitpid (entry->child_pid, &wstatus, 0); + } while (wait_pid == -1 && errno == EINTR); + + SAFE_FREE(entry); + + if (wait_pid == -1) + return -1; + return wstatus; +} + +/************************************************************************** + Wrappers for dlopen, dlsym, dlclose. +****************************************************************************/ + +void *sys_dlopen(const char *name, int flags) +{ +#if defined(HAVE_DLOPEN) + return dlopen(name, flags); +#else + return NULL; +#endif +} + +void *sys_dlsym(void *handle, const char *symbol) +{ +#if defined(HAVE_DLSYM) + return dlsym(handle, symbol); +#else + return NULL; +#endif +} + +int sys_dlclose (void *handle) +{ +#if defined(HAVE_DLCLOSE) + return dlclose(handle); +#else + return 0; +#endif +} + +const char *sys_dlerror(void) +{ +#if defined(HAVE_DLERROR) + return dlerror(); +#else + return NULL; +#endif +} + +int sys_dup2(int oldfd, int newfd) +{ +#if defined(HAVE_DUP2) + return dup2(oldfd, newfd); +#else + errno = ENOSYS; + return -1; +#endif +} + |