X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/94481d9113220ded7ee6a76a96fa468c79680478..79a51e7ee68097b98bc2234b70d16c011bdc3608:/util.c

diff --git a/util.c b/util.c
index 1c733940..6470bf97 100644
--- a/util.c
+++ b/util.c
@@ -24,261 +24,538 @@
   */
 #include "rsync.h"
 
-static int total_written = 0;
-static int total_read = 0;
-
-extern int verbose;
-
-int write_total(void)
+int num_waiting(int fd)
 {
-  return total_written;
+  int len=0;
+  ioctl(fd,FIONREAD,&len);
+  return(len);
 }
 
-int read_total(void)
+
+
+/* this is taken from CVS */
+int piped_child(char **command,int *f_in,int *f_out)
 {
-  return total_read;
+  int pid;
+  int to_child_pipe[2];
+  int from_child_pipe[2];
+
+  if (pipe(to_child_pipe) < 0 ||
+      pipe(from_child_pipe) < 0) {
+    rprintf(FERROR,"pipe: %s\n",strerror(errno));
+    exit_cleanup(1);
+  }
+
+
+  pid = do_fork();
+  if (pid < 0) {
+    rprintf(FERROR,"fork: %s\n",strerror(errno));
+    exit_cleanup(1);
+  }
+
+  if (pid == 0)
+    {
+      extern int orig_umask;
+      if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
+	  close(to_child_pipe[1]) < 0 ||
+	  close(from_child_pipe[0]) < 0 ||
+	  dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
+	rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno));
+	exit_cleanup(1);
+      }
+      if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]);
+      if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]);
+      umask(orig_umask);
+      execvp(command[0], command);
+      rprintf(FERROR,"Failed to exec %s : %s\n",
+	      command[0],strerror(errno));
+      exit_cleanup(1);
+    }
+
+  if (close(from_child_pipe[1]) < 0 ||
+      close(to_child_pipe[0]) < 0) {
+    rprintf(FERROR,"Failed to close : %s\n",strerror(errno));   
+    exit_cleanup(1);
+  }
+
+  *f_in = from_child_pipe[0];
+  *f_out = to_child_pipe[1];
+  
+  return pid;
 }
 
-void write_int(int f,int x)
+int local_child(int argc, char **argv,int *f_in,int *f_out)
 {
-  char b[4];
-  SIVAL(b,0,x);
-  if (write(f,b,4) != 4) {
-    fprintf(stderr,"write_int failed : %s\n",strerror(errno));
-    exit(1);
-  }
-  total_written += 4;
+	int pid;
+	int to_child_pipe[2];
+	int from_child_pipe[2];
+
+	if (pipe(to_child_pipe) < 0 ||
+	    pipe(from_child_pipe) < 0) {
+		rprintf(FERROR,"pipe: %s\n",strerror(errno));
+		exit_cleanup(1);
+	}
+
+
+	pid = do_fork();
+	if (pid < 0) {
+		rprintf(FERROR,"fork: %s\n",strerror(errno));
+		exit_cleanup(1);
+	}
+
+	if (pid == 0) {
+		extern int am_sender;
+		extern int am_server;
+
+		am_sender = !am_sender;
+		am_server = 1;		
+
+		if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
+		    close(to_child_pipe[1]) < 0 ||
+		    close(from_child_pipe[0]) < 0 ||
+		    dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
+			rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno));
+			exit_cleanup(1);
+		}
+		if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]);
+		if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]);
+		start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
+	}
+
+	if (close(from_child_pipe[1]) < 0 ||
+	    close(to_child_pipe[0]) < 0) {
+		rprintf(FERROR,"Failed to close : %s\n",strerror(errno));   
+		exit_cleanup(1);
+	}
+
+	*f_in = from_child_pipe[0];
+	*f_out = to_child_pipe[1];
+  
+	return pid;
 }
 
-void write_buf(int f,char *buf,int len)
+
+
+void out_of_memory(char *str)
 {
-  if (write(f,buf,len) != len) {
-    fprintf(stderr,"write_buf failed : %s\n",strerror(errno));
-    exit(1);
-  }
-  total_written += len;
+  rprintf(FERROR,"ERROR: out of memory in %s\n",str);
+  exit_cleanup(1);
 }
 
-static int num_waiting(int fd)
+void overflow(char *str)
 {
-  int len=0;
-#ifdef FIONREAD
-  ioctl(fd,FIONREAD,&len);
-#endif
-  return(len);
+  rprintf(FERROR,"ERROR: buffer overflow in %s\n",str);
+  exit_cleanup(1);
 }
 
-static char *read_buffer = NULL;
-static char *read_buffer_p = NULL;
-static int read_buffer_len = 0;
-static int read_buffer_size = 0;
 
 
-void write_flush(int f)
+int set_modtime(char *fname,time_t modtime)
 {
+	extern int dry_run;
+	if (dry_run) return 0;
+	{
+#ifdef HAVE_UTIMBUF
+		struct utimbuf tbuf;  
+		tbuf.actime = time(NULL);
+		tbuf.modtime = modtime;
+		return utime(fname,&tbuf);
+#elif defined(HAVE_UTIME)
+		time_t t[2];
+		t[0] = time(NULL);
+		t[1] = modtime;
+		return utime(fname,t);
+#else
+		struct timeval t[2];
+		t[0].tv_sec = time(NULL);
+		t[0].tv_usec = 0;
+		t[1].tv_sec = modtime;
+		t[1].tv_usec = 0;
+		return utimes(fname,t);
+#endif
+	}
 }
 
-void read_check(int f)
+
+/****************************************************************************
+create any necessary directories in fname. Unfortunately we don't know
+what perms to give the directory when this is called so we need to rely
+on the umask
+****************************************************************************/
+int create_directory_path(char *fname)
 {
-  int n;
+	extern int orig_umask;
+	char *p;
+
+	while (*fname == '/') fname++;
+	while (strncmp(fname,"./",2)==0) fname += 2;
+
+	p = fname;
+	while ((p=strchr(p,'/'))) {
+		*p = 0;
+		do_mkdir(fname,0777 & ~orig_umask); 
+		*p = '/';
+		p++;
+	}
+	return 0;
+}
 
-  if (read_buffer_len == 0) {
-    read_buffer_p = read_buffer;
-  }
 
-  if ((n=num_waiting(f)) <= 0)
-    return;
+/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted.
+   Return LEN upon success, write's (negative) error code otherwise.  
 
-  if (read_buffer_p != read_buffer) {
-    memmove(read_buffer,read_buffer_p,read_buffer_len);
-    read_buffer_p = read_buffer;
-  }
+   derived from GNU C's cccp.c.
+*/
+int full_write(int desc, char *ptr, int len)
+{
+	int total_written;
+	
+	total_written = 0;
+	while (len > 0) {
+		int written = write (desc, ptr, len);
+		if (written < 0)  {
+#ifdef EINTR
+			if (errno == EINTR)
+				continue;
+#endif
+			return written;
+		}
+		total_written += written;
+		ptr += written;
+		len -= written;
+	}
+	return total_written;
+}
 
-  if (n > (read_buffer_size - read_buffer_len)) {
-    read_buffer_size += n;
-    if (!read_buffer)
-      read_buffer = (char *)malloc(read_buffer_size);
-    else
-      read_buffer = (char *)realloc(read_buffer,read_buffer_size);
-    if (!read_buffer) out_of_memory("read check");      
-    read_buffer_p = read_buffer;      
-  }
+/* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted.
+   Return the actual number of bytes read, zero for EOF, or negative
+   for an error.  
 
-  n = read(f,read_buffer+read_buffer_len,n);
-  if (n > 0) {
-    read_buffer_len += n;
-  }
+   derived from GNU C's cccp.c. */
+int safe_read(int desc, char *ptr, int len)
+{
+	int n_chars;
+ 
+	if (len <= 0)
+		return len;
+ 
+#ifdef EINTR
+	do {
+		n_chars = read(desc, ptr, len);
+	} while (n_chars < 0 && errno == EINTR);
+#else
+	n_chars = read(desc, ptr, len);
+#endif
+ 
+	return n_chars;
 }
 
 
-static int readfd(int fd,char *buffer,int N)
+/* copy a file - this is used in conjunction with the --temp-dir option */
+int copy_file(char *source, char *dest, mode_t mode)
 {
-  int  ret;
-  int total=0;  
- 
-  while (total < N)
-    {
-      if (read_buffer_len > 0) {
-	ret = MIN(read_buffer_len,N-total);
-	memcpy(buffer+total,read_buffer_p,ret);
-	read_buffer_p += ret;
-	read_buffer_len -= ret;
-      } else {
-	ret = read(fd,buffer + total,N - total);
-      }
+	int ifd;
+	int ofd;
+	char buf[1024 * 8];
+	int len;   /* Number of bytes read into `buf'. */
+
+	ifd = open(source, O_RDONLY);
+	if (ifd == -1) {
+		rprintf(FERROR,"open %s: %s\n",
+			source,strerror(errno));
+		return -1;
+	}
+
+	if (do_unlink(dest) && errno != ENOENT) {
+		rprintf(FERROR,"unlink %s: %s\n",
+			dest,strerror(errno));
+		return -1;
+	}
+
+	ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode);
+	if (ofd < 0) {
+		rprintf(FERROR,"open %s: %s\n",
+			dest,strerror(errno));
+		close(ifd);
+		return -1;
+	}
+
+	while ((len = safe_read(ifd, buf, sizeof(buf))) > 0) {
+		if (full_write(ofd, buf, len) < 0) {
+			rprintf(FERROR,"write %s: %s\n",
+				dest,strerror(errno));
+			close(ifd);
+			close(ofd);
+			return -1;
+		}
+	}
+
+	close(ifd);
+	close(ofd);
+
+	if (len < 0) {
+		rprintf(FERROR,"read %s: %s\n",
+			source,strerror(errno));
+		return -1;
+	}
+
+	return 0;
+}
 
-      if (ret <= 0)
-	return total;
-      total += ret;
-    }
-  return total;
+/* sleep for a while via select */
+void u_sleep(int usec)
+{
+	struct timeval tv;
+
+	tv.tv_sec = 0;
+	tv.tv_usec = usec;
+	select(0, NULL, NULL, NULL, &tv);
 }
 
 
-int read_int(int f)
+static pid_t all_pids[10];
+static int num_pids;
+
+/* fork and record the pid of the child */
+pid_t do_fork(void)
 {
-  char b[4];
-  if (readfd(f,b,4) != 4) {
-    if (verbose > 1) 
-      fprintf(stderr,"Error reading %d bytes : %s\n",4,strerror(errno));
-    exit(1);
-  }
-  total_read += 4;
-  return IVAL(b,0);
+	pid_t newpid = fork();
+	
+	if (newpid) {
+		all_pids[num_pids++] = newpid;
+	}
+	return newpid;
 }
 
-void read_buf(int f,char *buf,int len)
+/* kill all children */
+void kill_all(int sig)
 {
-  if (readfd(f,buf,len) != len) {
-    if (verbose > 1) 
-      fprintf(stderr,"Error reading %d bytes : %s\n",len,strerror(errno));
-    exit(1);
-  }
-  total_read += len;
+	int i;
+	for (i=0;i<num_pids;i++) {
+		if (all_pids[i] != getpid())
+			kill(all_pids[i], sig);
+	}
+}
+
+/* like strncpy but does not 0 fill the buffer and always null 
+   terminates (thus it can use maxlen+1 space in d) */
+void strlcpy(char *d, char *s, int maxlen)
+{
+	int len = strlen(s);
+	if (len > maxlen) len = maxlen;
+	memcpy(d, s, len);
+	d[len] = 0;
 }
 
+/* like strncat but does not 0 fill the buffer and always null 
+   terminates (thus it can use maxlen+1 space in d) */
+void strlcat(char *d, char *s, int maxlen)
+{
+	int len1 = strlen(d);
+	int len2 = strlen(s);
+	if (len1+len2 > maxlen) {
+		len2 = maxlen-len1;
+	}
+	if (len2 > 0) {
+		memcpy(d+len1, s, len2);
+		d[len1+len2] = 0;
+	}
+}
 
-char *map_file(int fd,off_t len)
+/* turn a user name into a uid */
+int name_to_uid(char *name, uid_t *uid)
 {
-  char *ret = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0);
-  return ret;
+	struct passwd *pass;
+	if (!name || !*name) return 0;
+	pass = getpwnam(name);
+	if (pass) {
+		*uid = pass->pw_uid;
+		return 1;
+	}
+	return 0;
 }
 
-void unmap_file(char *buf,off_t len)
+/* turn a group name into a gid */
+int name_to_gid(char *name, gid_t *gid)
 {
-  if (len > 0 && buf)
-    munmap(buf,len);
+	struct group *grp;
+	if (!name || !*name) return 0;
+	grp = getgrnam(name);
+	if (grp) {
+		*gid = grp->gr_gid;
+		return 1;
+	}
+	return 0;
 }
 
 
-int read_write(int fd_in,int fd_out,int size)
+/****************************************************************************
+check if a process exists. 
+****************************************************************************/
+int process_exists(int pid)
 {
-  static char *buf=NULL;
-  static int bufsize = WRITE_BLOCK_SIZE;
-  int total=0;
-  
-  if (!buf) {
-    buf = (char *)malloc(bufsize);
-    if (!buf) out_of_memory("read_write");
-  }
+	return(kill(pid,0) == 0 || errno != ESRCH);
+}
 
-  while (total < size) {
-    int n = MIN(size-total,bufsize);
-    read_buf(fd_in,buf,n);
-    if (write(fd_out,buf,n) != n)
-      return total;
-    total += n;
-  }
-  return total;
+/* lock a byte range in a open file */
+int lock_range(int fd, int offset, int len)
+{
+	struct flock lock;
+
+	lock.l_type = F_WRLCK;
+	lock.l_whence = SEEK_SET;
+	lock.l_start = offset;
+	lock.l_len = len;
+	lock.l_pid = 0;
+	
+	return fcntl(fd,F_SETLK,&lock) == 0;
 }
 
 
-/* this is taken from CVS */
-int piped_child(char **command,int *f_in,int *f_out)
+static void glob_expand_one(char *s, char **argv, int *argc, int maxargs)
 {
-  int pid;
-  int to_child_pipe[2];
-  int from_child_pipe[2];
+#ifndef HAVE_GLOB
+	if (!*s) s = ".";
+	argv[*argc] = strdup(s);
+	(*argc)++;
+	return;
+#else
+	glob_t globbuf;
+	int i;
+
+	if (!*s) s = ".";
+
+	argv[*argc] = strdup(s);
+
+	memset(&globbuf, 0, sizeof(globbuf));
+	glob(argv[*argc], 0, NULL, &globbuf);
+	if (globbuf.gl_pathc == 0) {
+		(*argc)++;
+		globfree(&globbuf);
+		return;
+	}
+	for (i=0; i<(maxargs - (*argc)) && i<globbuf.gl_pathc;i++) {
+		if (i == 0) free(argv[*argc]);
+		argv[(*argc) + i] = strdup(globbuf.gl_pathv[i]);
+		if (!argv[(*argc) + i]) out_of_memory("glob_expand");
+	}
+	globfree(&globbuf);
+	(*argc) += i;
+#endif
+}
 
-  if (pipe(to_child_pipe) < 0 ||
-      pipe(from_child_pipe) < 0) {
-    fprintf(stderr,"pipe: %s\n",strerror(errno));
-    exit(1);
-  }
+void glob_expand(char *base1, char **argv, int *argc, int maxargs)
+{
+	char *s = argv[*argc];
+	char *p, *q;
+	char *base = base1;
 
+	if (!s || !*s) return;
 
-  pid = fork();
-  if (pid < 0) {
-    fprintf(stderr,"fork: %s\n",strerror(errno));
-    exit(1);
-  }
+	if (strncmp(s, base, strlen(base)) == 0) {
+		s += strlen(base);
+	}
 
-  if (pid == 0)
-    {
-      if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
-	  close(to_child_pipe[1]) < 0 ||
-	  close(from_child_pipe[0]) < 0 ||
-	  dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
-	fprintf(stderr,"Failed to dup/close : %s\n",strerror(errno));
-	exit(1);
-      }
-      execvp(command[0], command);
-      fprintf(stderr,"Failed to exec %s : %s\n",
-	      command[0],strerror(errno));
-      exit(1);
-    }
+	s = strdup(s);
+	if (!s) out_of_memory("glob_expand");
 
-  if (close(from_child_pipe[1]) < 0 ||
-      close(to_child_pipe[0]) < 0) {
-    fprintf(stderr,"Failed to close : %s\n",strerror(errno));   
-    exit(1);
-  }
+	base = (char *)malloc(strlen(base1)+3);
+	if (!base) out_of_memory("glob_expand");
 
-  *f_in = from_child_pipe[0];
-  *f_out = to_child_pipe[1];
-  
-  return pid;
+	sprintf(base," %s/", base1);
+
+	q = s;
+	while ((p = strstr(q,base)) && ((*argc) < maxargs)) {
+		/* split it at this point */
+		*p = 0;
+		glob_expand_one(q, argv, argc, maxargs);
+		q = p+strlen(base);
+	}
+
+	if (*q && (*argc < maxargs)) glob_expand_one(q, argv, argc, maxargs);
+
+	free(s);
+	free(base);
 }
 
+/*******************************************************************
+  convert a string to lower case
+********************************************************************/
+void strlower(char *s)
+{
+	while (*s) {
+		if (isupper(*s)) *s = tolower(*s);
+		s++;
+	}
+}
 
-void out_of_memory(char *str)
+/* this is like vsnprintf but the 'n' limit does not include
+   the terminating null. So if you have a 1024 byte buffer then
+   pass 1023 for n */
+int vslprintf(char *str, int n, const char *format, va_list ap)
 {
-  fprintf(stderr,"out of memory in %s\n",str);
-  exit(1);
+#ifdef HAVE_VSNPRINTF
+	int ret = vsnprintf(str, n, format, ap);
+	if (ret > n || ret < 0) {
+		str[n] = 0;
+		return -1;
+	}
+	str[ret] = 0;
+	return ret;
+#else
+	static char *buf;
+	static int len=MAXPATHLEN*8;
+	int ret;
+
+	/* this code is NOT a proper vsnprintf() implementation. It
+	   relies on the fact that all calls to slprintf() in rsync
+	   pass strings which have already been checked to be less
+	   than MAXPATHLEN in length and never more than 2 strings are
+	   concatenated. This means the above buffer is absolutely
+	   ample and can never be overflowed.
+
+	   In the future we would like to replace this with a proper
+	   vsnprintf() implementation but right now we need a solution
+	   that is secure and portable. This is it.  */
+
+	if (!buf) {
+		buf = malloc(len);
+		if (!buf) {
+			/* can't call debug or we would recurse */
+			exit_cleanup(1);
+		}
+	}
+
+	vsprintf(buf, format, ap);
+	ret = strlen(buf);
+	if (ret > n) {
+		/* yikes! */
+		exit_cleanup(1);
+	}
+	buf[ret] = 0;
+	
+	memcpy(str, buf, ret+1);
+
+	return ret;
+#endif
 }
 
 
-#ifndef HAVE_STRDUP
- char *strdup(char *s)
+/* like snprintf but always null terminates */
+int slprintf(char *str, int n, char *format, ...)
 {
-  int l = strlen(s) + 1;
-  char *ret = (char *)malloc(l);
-  if (ret)
-    strcpy(ret,s);
-  return ret;
+	va_list ap;  
+	int ret;
+
+	va_start(ap, format);
+	ret = vslprintf(str,n,format,ap);
+	va_end(ap);
+	return ret;
 }
-#endif
 
 
-int set_modtime(char *fname,time_t modtime)
+void *Realloc(void *p, int size)
 {
-#ifdef HAVE_UTIME_H
-  struct utimbuf tbuf;  
-  tbuf.actime = time(NULL);
-  tbuf.modtime = modtime;
-  return utime(fname,&tbuf);
-#elif defined(HAVE_UTIME)
-  time_t t[2];
-  t[0] = time(NULL);
-  t[1] = modtime;
-  return utime(fname,t);
-#else
-  struct timeval t[2];
-  t[0].tv_sec = time(NULL);
-  t[0].tv_usec = 0;
-  t[1].tv_sec = modtime;
-  t[1].tv_usec = 0;
-  return utimes(fname,t);
-#endif
+	if (!p) return (void *)malloc(size);
+	return (void *)realloc(p, size);
 }
-