pppd.8: Document netmask option

[ppp.git] / pppd / utils.c

diff --git a/pppd/utils.c b/pppd/utils.c
index c1bdbbbfe4e52d8a06edb3c8b22462580b3644a3..bf9923ce362224d8c2095648b37202587f51f777 100644 (file)
--- a/pppd/utils.c
+++ b/pppd/utils.c
@@ -17,7 +17,7 @@
  * 3. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by Paul Mackerras
- *     <paulus@samba.org>".
+ *     <paulus@ozlabs.org>".
  *
  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
@@ -68,7 +68,7 @@
 extern char *strerror();
 #endif
 
-static void logit(int, char *, va_list);
+static void logit(int, const char *, va_list);
 static void log_write(int, char *);
 static void vslp_printer(void *, char *, ...);
 static void format_packet(u_char *, int, printer_func, void *);
@@ -120,7 +120,7 @@ strlcat(char *dest, const char *src, size_t len)
  * Returns the number of chars put into buf.
  */
 int
-slprintf(char *buf, int buflen, char *fmt, ...)
+slprintf(char *buf, int buflen, const char *fmt, ...)
 {
     va_list args;
     int n;
@@ -137,14 +137,15 @@ slprintf(char *buf, int buflen, char *fmt, ...)
 #define OUTCHAR(c)     (buflen > 0? (--buflen, *buf++ = (c)): 0)
 
 int
-vslprintf(char *buf, int buflen, char *fmt, va_list args)
+vslprintf(char *buf, int buflen, const char *fmt, va_list args)
 {
     int c, i, n;
     int width, prec, fillch;
     int base, len, neg, quoted;
     long lval = 0;
     unsigned long val = 0;
-    char *str, *f, *buf0;
+    char *str, *buf0;
+    const char *f;
     unsigned char *p;
     char num[32];
     time_t t;
@@ -600,7 +601,7 @@ print_string(char *p, int len, printer_func printer, void *arg)
  * logit - does the hard work for fatal et al.
  */
 static void
-logit(int level, char *fmt, va_list args)
+logit(int level, const char *fmt, va_list args)
 {
     char buf[1024];
 
@@ -635,7 +636,7 @@ log_write(int level, char *buf)
  * fatal - log an error message and die horribly.
  */
 void
-fatal(char *fmt, ...)
+fatal(const char *fmt, ...)
 {
     va_list pvar;
 
@@ -655,7 +656,7 @@ fatal(char *fmt, ...)
  * error - log an error message.
  */
 void
-error(char *fmt, ...)
+error(const char *fmt, ...)
 {
     va_list pvar;
 
@@ -670,7 +671,7 @@ error(char *fmt, ...)
  * warn - log a warning message.
  */
 void
-warn(char *fmt, ...)
+warn(const char *fmt, ...)
 {
     va_list pvar;
 
@@ -684,7 +685,7 @@ warn(char *fmt, ...)
  * notice - log a notice-level message.
  */
 void
-notice(char *fmt, ...)
+notice(const char *fmt, ...)
 {
     va_list pvar;
 
@@ -698,7 +699,7 @@ notice(char *fmt, ...)
  * info - log an informational message.
  */
 void
-info(char *fmt, ...)
+info(const char *fmt, ...)
 {
     va_list pvar;
 
@@ -712,7 +713,7 @@ info(char *fmt, ...)
  * dbglog - log a debug message.
  */
 void
-dbglog(char *fmt, ...)
+dbglog(const char *fmt, ...)
 {
     va_list pvar;
 
@@ -781,6 +782,88 @@ complete_read(int fd, void *buf, size_t count)
 }
 #endif
 
+/*
+ * mkdir_check - helper for mkdir_recursive, creates a directory
+ * but do not error on EEXIST if and only if entry is a directory
+ * The caller must check for errno == ENOENT if appropriate.
+ */
+static int
+mkdir_check(const char *path)
+{
+    struct stat statbuf;
+
+    if (mkdir(path, 0755) >= 0)
+       return 0;
+
+    if (errno == EEXIST) {
+       if (stat(path, &statbuf) < 0)
+           /* got raced? */
+           return -1;
+
+       if ((statbuf.st_mode & S_IFMT) == S_IFDIR)
+           return 0;
+
+       /* already exists but not a dir, treat as failure */
+       errno = EEXIST;
+       return -1;
+    }
+
+    return -1;
+}
+
+/*
+ * mkdir_parent - helper for mkdir_recursive, modifies the string in place
+ * Assumes mkdir(path) already failed, so it first creates the parent then
+ * full path again.
+ */
+static int
+mkdir_parent(char *path)
+{
+    char *slash;
+    int rc;
+
+    slash = strrchr(path, '/');
+    if (!slash)
+       return -1;
+
+    *slash = 0;
+    if (mkdir_check(path) < 0) {
+       if (errno != ENOENT) {
+           *slash = '/';
+           return -1;
+       }
+       if (mkdir_parent(path) < 0) {
+           *slash = '/';
+           return -1;
+       }
+    }
+    *slash = '/';
+
+    return mkdir_check(path);
+}
+
+/*
+ * mkdir_recursive - recursively create directory if it didn't exist
+ */
+int
+mkdir_recursive(const char *path)
+{
+    char *copy;
+    int rc;
+
+    // optimistically try on full path first to avoid allocation
+    if (mkdir_check(path) == 0)
+       return 0;
+
+    copy = strdup(path);
+    if (!copy)
+       return -1;
+
+    rc = mkdir_parent(copy);
+    free(copy);
+    return rc;
+}
+
 /* Procedures for locking the serial device using a lock file. */
 static char lock_file[MAXPATHLEN];