diff options
Diffstat (limited to 'contrib/sendmail/src/util.c')
| -rw-r--r-- | contrib/sendmail/src/util.c | 77 |
1 files changed, 76 insertions, 1 deletions
diff --git a/contrib/sendmail/src/util.c b/contrib/sendmail/src/util.c index f023865..2017211 100644 --- a/contrib/sendmail/src/util.c +++ b/contrib/sendmail/src/util.c @@ -12,7 +12,7 @@ */ #ifndef lint -static char id[] = "@(#)$Id: util.c,v 8.225.2.1.2.23 2001/05/17 18:10:18 gshapiro Exp $"; +static char id[] = "@(#)$Id: util.c,v 8.225.2.1.2.26 2001/06/01 08:23:25 gshapiro Exp $"; #endif /* ! lint */ #include <sendmail.h> @@ -2529,6 +2529,81 @@ proc_list_display(out) } } /* +** SAFEFOPEN -- do a file open with extra checking +** +** Parameters: +** fn -- the file name to open. +** omode -- the open-style mode flags. +** cmode -- the create-style mode flags. +** sff -- safefile flags. +** +** Returns: +** Same as fopen. +*/ + +FILE * +safefopen(fn, omode, cmode, sff) + char *fn; + int omode; + int cmode; + long sff; +{ + int fd; + int save_errno; + FILE *fp; + char *fmode; + + switch (omode & O_ACCMODE) + { + case O_RDONLY: + fmode = "r"; + break; + + case O_WRONLY: + if (bitset(O_APPEND, omode)) + fmode = "a"; + else + fmode = "w"; + break; + + case O_RDWR: + if (bitset(O_TRUNC, omode)) + fmode = "w+"; + else if (bitset(O_APPEND, omode)) + fmode = "a+"; + else + fmode = "r+"; + break; + + default: + syserr("554 5.3.5 safefopen: unknown omode %o", omode); + fmode = "x"; + } + fd = safeopen(fn, omode, cmode, sff); + if (fd < 0) + { + save_errno = errno; + if (tTd(44, 10)) + dprintf("safefopen: safeopen failed: %s\n", + errstring(errno)); + errno = save_errno; + return NULL; + } + fp = fdopen(fd, fmode); + if (fp != NULL) + return fp; + + save_errno = errno; + if (tTd(44, 10)) + { + dprintf("safefopen: fdopen(%s, %s) failed: omode=%x, sff=%lx, err=%s\n", + fn, fmode, omode, sff, errstring(errno)); + } + (void) close(fd); + errno = save_errno; + return NULL; +} + /* ** SM_STRCASECMP -- 8-bit clean version of strcasecmp ** ** Thank you, vendors, for making this all necessary. |
