diff options
Diffstat (limited to '')
-rw-r--r-- | lib/util/vsyslog.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/util/vsyslog.c b/lib/util/vsyslog.c new file mode 100644 index 0000000..359a8f3 --- /dev/null +++ b/lib/util/vsyslog.c @@ -0,0 +1,82 @@ +/* + * Copyright (c) 2016-2017 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include <config.h> + +#include <errno.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#ifdef HAVE_STRING_H +# include <string.h> +#endif /* HAVE_STRING_H */ +#ifdef HAVE_STRINGS_H +# include <strings.h> +#endif /* HAVE_STRINGS_H */ +#include <syslog.h> + +#include "sudo_compat.h" + +#ifndef HAVE_VSYSLOG +void +sudo_vsyslog(int pri, const char *fmt, va_list ap) +{ + int saved_errno = errno; + char *cp, *ep, msgbuf[8192], new_fmt[2048]; + va_list ap2; + size_t len; + + /* Rewrite fmt, replacing %m with an errno string. */ + for (cp = new_fmt, ep = new_fmt + sizeof(new_fmt); *fmt != '\0'; fmt++) { + if (fmt[0] == '%' && fmt[1] == 'm') { + fmt++; + len = strlcpy(cp, strerror(saved_errno), (ep - cp)); + if (len >= (size_t)(ep - cp)) + len = (size_t)(ep - cp) - 1; + cp += len; + } else { + if (fmt[0] == '%' && fmt[1] == '%') { + fmt++; + if (cp < ep - 1) + *cp++ = '%'; + } + if (cp < ep - 1) + *cp++ = *fmt; + } + } + *cp = '\0'; + + /* Format message and log it, using a static buffer if possible. */ + va_copy(ap2, ap); + len = (size_t)vsnprintf(msgbuf, sizeof(msgbuf), new_fmt, ap2); + va_end(ap2); + if (len < sizeof(msgbuf)) { + syslog(pri, "%s", msgbuf); + } else { + /* Too big for static buffer? */ + char *buf; + if (vasprintf(&buf, new_fmt, ap) != -1) { + syslog(pri, "%s", buf); + free(buf); + } + } +} +#endif /* HAVE_VSYSLOG */ |