diff options
Diffstat (limited to 'support/pwd.c')
| -rw-r--r-- | support/pwd.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/support/pwd.c b/support/pwd.c new file mode 100644 index 00000000000..05357f4f617 --- /dev/null +++ b/support/pwd.c @@ -0,0 +1,264 @@ +/* + * <pwd.h> wrapper functions. + * + * Authors: + * Jonathan Pryor (jonpryor@vt.edu) + * + * Copyright (C) 2004 Jonathan Pryor + */ + +#include <pwd.h> +#include <errno.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> + +#include "mph.h" + +G_BEGIN_DECLS + +struct Mono_Posix_Syscall__Passwd { + /* string */ char *pw_name; + /* string */ char *pw_passwd; + /* uid_t */ mph_uid_t pw_uid; + /* gid_t */ mph_gid_t pw_gid; + /* string */ char *pw_gecos; + /* string */ char *pw_dir; + /* string */ char *pw_shell; + /* string */ char *_pw_buf_; +}; + +/* + * Copy the native `passwd' structure to it's managed representation. + * + * To minimize separate mallocs, all the strings are allocated within the same + * memory block (stored in _pw_buf_). + */ +static int +copy_passwd (struct Mono_Posix_Syscall__Passwd *to, struct passwd *from) +{ + enum {PW_NAME = 0, PW_PASSWD, PW_GECOS, PW_DIR, PW_SHELL, PW_LAST}; + size_t buflen, len[PW_LAST]; + /* bool */ unsigned char copy[PW_LAST] = {0}; + const char *source[PW_LAST]; + char **dest[PW_LAST]; + int i; + char *cur; + + to->pw_uid = from->pw_uid; + to->pw_gid = from->pw_gid; + + to->pw_name = NULL; + to->pw_passwd = NULL; + to->pw_gecos = NULL; + to->pw_dir = NULL; + to->pw_shell = NULL; + to->_pw_buf_ = NULL; + + source[PW_NAME] = from->pw_name; + source[PW_PASSWD] = from->pw_passwd; + source[PW_GECOS] = from->pw_gecos; + source[PW_DIR] = from->pw_dir; + source[PW_SHELL] = from->pw_shell; + + dest[PW_NAME] = &to->pw_name; + dest[PW_PASSWD] = &to->pw_passwd; + dest[PW_GECOS] = &to->pw_gecos; + dest[PW_DIR] = &to->pw_dir; + dest[PW_SHELL] = &to->pw_shell; + + buflen = PW_LAST; + + /* over-rigorous checking for integer overflow */ + for (i = 0; i != PW_LAST; ++i) { + len[i] = strlen (source[i]); + if (len[i] < INT_MAX - buflen) { + buflen += len[i]; + copy[i] = 1; + } + } + + cur = to->_pw_buf_ = (char*) malloc (buflen); + if (cur == NULL) { + return -1; + } + + for (i = 0; i != PW_LAST; ++i) { + if (copy[i]) { + *dest[i] = strcpy (cur, source[i]); + cur += (len[i] + 1); + } + } + + return 0; +} + +gint32 +Mono_Posix_Syscall_getpwnam (const char *name, struct Mono_Posix_Syscall__Passwd *pwbuf) +{ + struct passwd *pw; + + if (pwbuf == NULL) { + errno = EFAULT; + return -1; + } + + pw = getpwnam (name); + if (pw == NULL) + return -1; + + if (copy_passwd (pwbuf, pw) == -1) { + errno = ENOMEM; + return -1; + } + return 0; +} + +gint32 +Mono_Posix_Syscall_getpwuid (mph_uid_t uid, struct Mono_Posix_Syscall__Passwd *pwbuf) +{ + struct passwd *pw; + + if (pwbuf == NULL) { + errno = EFAULT; + return -1; + } + + errno = 0; + pw = getpwuid (uid); + if (pw == NULL) { + return -1; + } + + if (copy_passwd (pwbuf, pw) == -1) { + errno = ENOMEM; + return -1; + } + return 0; +} + +#ifdef HAVE_GETPWNAM_R +gint32 +Mono_Posix_Syscall_getpwnam_r (const char *name, + struct Mono_Posix_Syscall__Passwd *pwbuf, + struct passwd **pwbufp) +{ + char *buf, *buf2; + size_t buflen; + int r; + struct passwd _pwbuf; + + if (pwbuf == NULL) { + errno = EFAULT; + return -1; + } + + buf = buf2 = NULL; + buflen = 2; + + do { + buf2 = realloc (buf, buflen *= 2); + if (buf2 == NULL) { + free (buf); + errno = ENOMEM; + return -1; + } + buf = buf2; + } while ((r = getpwnam_r (name, &_pwbuf, buf, buflen, pwbufp)) && + recheck_range (r)); + + if (r == 0 && copy_passwd (pwbuf, &_pwbuf) == -1) + r = errno = ENOMEM; + free (buf); + + return r; +} +#endif /* ndef HAVE_GETPWNAM_R */ + +#ifdef HAVE_GETPWUID_R +gint32 +Mono_Posix_Syscall_getpwuid_r (mph_uid_t uid, + struct Mono_Posix_Syscall__Passwd *pwbuf, + struct passwd **pwbufp) +{ + char *buf, *buf2; + size_t buflen; + int r; + struct passwd _pwbuf; + + if (pwbuf == NULL) { + errno = EFAULT; + return -1; + } + + buf = buf2 = NULL; + buflen = 2; + + do { + buf2 = realloc (buf, buflen *= 2); + if (buf2 == NULL) { + free (buf); + errno = ENOMEM; + return -1; + } + buf = buf2; + } while ((r = getpwuid_r (uid, &_pwbuf, buf, buflen, pwbufp)) && + recheck_range (r)); + + if (r == 0 && copy_passwd (pwbuf, &_pwbuf) == -1) + r = errno = ENOMEM; + free (buf); + + return r; +} +#endif /* ndef HAVE_GETPWUID_R */ + +gint32 +Mono_Posix_Syscall_getpwent (struct Mono_Posix_Syscall__Passwd *pwbuf) +{ + struct passwd *pw; + + if (pwbuf == NULL) { + errno = EFAULT; + return -1; + } + + pw = getpwent (); + if (pw == NULL) + return -1; + + if (copy_passwd (pwbuf, pw) == -1) { + errno = ENOMEM; + return -1; + } + return 0; +} + +#ifdef HAVE_FGETPWENT +gint32 +Mono_Posix_Syscall_fgetpwent (FILE *stream, struct Mono_Posix_Syscall__Passwd *pwbuf) +{ + struct passwd *pw; + + if (pwbuf == NULL) { + errno = EFAULT; + return -1; + } + + pw = fgetpwent (stream); + if (pw == NULL) + return -1; + + if (copy_passwd (pwbuf, pw) == -1) { + errno = ENOMEM; + return -1; + } + return 0; +} +#endif /* ndef HAVE_FGETPWENT */ + +G_END_DECLS + +/* + * vim: noexpandtab + */ |