Merge r1331110 from trunk:

Replace use of apr_file_write() with apr_file_write_full() to prevent
incomplete writes.

Add comments in some places where error handling/logging is missing.

PR: 53131.
Submitted by: Nicolas Viennot <apache viennot biz>, Stefan Fritsch

Submitted by: sf
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1430514 13f79535-47bb-0310-9956-ffa450edef68

5 files changed, 18 insertions, 19 deletions

diff --git a/modules/cache/mod_cache_disk.c b/modules/cache/mod_cache_disk.c
index ab8429fc61..8427e8fd60 100644
--- a/modules/cache/mod_cache_disk.c
+++ b/modules/cache/mod_cache_disk.c
@@ -757,8 +757,7 @@ static apr_status_t store_array(apr_file_t *fd, apr_array_header_t* arr)
         iov[1].iov_base = CRLF;
         iov[1].iov_len = sizeof(CRLF) - 1;
 
-        rv = apr_file_writev(fd, (const struct iovec *) &iov, 2,
-                             &amt);
+        rv = apr_file_writev_full(fd, (const struct iovec *) &iov, 2, &amt);
         if (rv != APR_SUCCESS) {
             return rv;
         }
@@ -767,8 +766,7 @@ static apr_status_t store_array(apr_file_t *fd, apr_array_header_t* arr)
     iov[0].iov_base = CRLF;
     iov[0].iov_len = sizeof(CRLF) - 1;
 
-    return apr_file_writev(fd, (const struct iovec *) &iov, 1,
-                         &amt);
+    return apr_file_writev_full(fd, (const struct iovec *) &iov, 1, &amt);
 }
 
 static apr_status_t read_table(cache_handle_t *handle, request_rec *r,
@@ -916,8 +914,7 @@ static apr_status_t store_table(apr_file_t *fd, apr_table_t *table)
             iov[3].iov_base = CRLF;
             iov[3].iov_len = sizeof(CRLF) - 1;
 
-            rv = apr_file_writev(fd, (const struct iovec *) &iov, 4,
-                                 &amt);
+            rv = apr_file_writev_full(fd, (const struct iovec *) &iov, 4, &amt);
             if (rv != APR_SUCCESS) {
                 return rv;
             }
@@ -925,8 +922,7 @@ static apr_status_t store_table(apr_file_t *fd, apr_table_t *table)
     }
     iov[0].iov_base = CRLF;
     iov[0].iov_len = sizeof(CRLF) - 1;
-    rv = apr_file_writev(fd, (const struct iovec *) &iov, 1,
-                         &amt);
+    rv = apr_file_writev_full(fd, (const struct iovec *) &iov, 1, &amt);
     return rv;
 }
 
@@ -992,7 +988,7 @@ static apr_status_t write_headers(cache_handle_t *h, request_rec *r)
             }
 
             amt = sizeof(format);
-            rv = apr_file_write(dobj->vary.tempfd, &format, &amt);
+            rv = apr_file_write_full(dobj->vary.tempfd, &format, amt, NULL);
             if (rv != APR_SUCCESS) {
                 ap_log_rerror(APLOG_MARK, APLOG_WARNING, rv, r, APLOGNO(00722)
                         "could not write to vary file %s",
@@ -1003,8 +999,8 @@ static apr_status_t write_headers(cache_handle_t *h, request_rec *r)
             }
 
             amt = sizeof(h->cache_obj->info.expire);
-            rv = apr_file_write(dobj->vary.tempfd, &h->cache_obj->info.expire,
-                    &amt);
+            rv = apr_file_write_full(dobj->vary.tempfd,
+                                     &h->cache_obj->info.expire, amt, NULL);
             if (rv != APR_SUCCESS) {
                 ap_log_rerror(APLOG_MARK, APLOG_WARNING, rv, r, APLOGNO(00723)
                         "could not write to vary file %s",
@@ -1069,7 +1065,8 @@ static apr_status_t write_headers(cache_handle_t *h, request_rec *r)
     iov[1].iov_base = (void*)dobj->name;
     iov[1].iov_len = disk_info.name_len;
 
-    rv = apr_file_writev(dobj->hdrs.tempfd, (const struct iovec *) &iov, 2, &amt);
+    rv = apr_file_writev_full(dobj->hdrs.tempfd, (const struct iovec *) &iov,
+                              2, &amt);
     if (rv != APR_SUCCESS) {
         ap_log_rerror(APLOG_MARK, APLOG_WARNING, rv, r, APLOGNO(00726)
                 "could not write info to header file %s",
diff --git a/modules/dav/fs/lock.c b/modules/dav/fs/lock.c
index 331d4e8314..a15b4b91c7 100644
--- a/modules/dav/fs/lock.c
+++ b/modules/dav/fs/lock.c
@@ -845,7 +845,7 @@ static dav_error * dav_fs_save_locknull_list(apr_pool_t *p, const char *dirpath,
     }
 
     amt = pbuf->cur_len;
-    if ((rv = apr_file_write(file, pbuf->buf, &amt)) != APR_SUCCESS
+    if ((rv = apr_file_write_full(file, pbuf->buf, amt, &amt)) != APR_SUCCESS
         || amt != pbuf->cur_len) {
         err = dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, rv,
                             apr_psprintf(p,
diff --git a/modules/filters/mod_ext_filter.c b/modules/filters/mod_ext_filter.c
index fc1ed2ce72..658c121a0b 100644
--- a/modules/filters/mod_ext_filter.c
+++ b/modules/filters/mod_ext_filter.c
@@ -681,9 +681,9 @@ static apr_status_t pass_data_to_filter(ap_filter_t *f, const char *data,
 
     do {
         tmplen = len - bytes_written;
-        rv = apr_file_write(ctx->proc->in,
+        rv = apr_file_write_full(ctx->proc->in,
                        (const char *)data + bytes_written,
-                       &tmplen);
+                       tmplen, &tmplen);
         bytes_written += tmplen;
         if (rv != APR_SUCCESS && !APR_STATUS_IS_EAGAIN(rv)) {
             ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, f->r, APLOGNO(01461)
diff --git a/modules/generators/mod_cgid.c b/modules/generators/mod_cgid.c
index 1155bd7501..56d3524330 100644
--- a/modules/generators/mod_cgid.c
+++ b/modules/generators/mod_cgid.c
@@ -1155,7 +1155,7 @@ static int log_script(request_rec *r, cgid_server_conf * conf, int ret,
             apr_file_puts("%stdout\n", f);
             first = 0;
         }
-        apr_file_write(f, buf, &len);
+        apr_file_write_full(f, buf, len, NULL);
         apr_file_puts("\n", f);
     }
 
diff --git a/modules/mappers/mod_rewrite.c b/modules/mappers/mod_rewrite.c
index 2193bfd0ee..cd293013d7 100644
--- a/modules/mappers/mod_rewrite.c
+++ b/modules/mappers/mod_rewrite.c
@@ -1403,9 +1403,10 @@ static char *lookup_map_program(request_rec *r, apr_file_t *fpin,
     /* write out the request key */
 #ifdef NO_WRITEV
     nbytes = strlen(key);
-    apr_file_write(fpin, key, &nbytes);
+    /* XXX: error handling */
+    apr_file_write_full(fpin, key, nbytes, NULL);
     nbytes = 1;
-    apr_file_write(fpin, "\n", &nbytes);
+    apr_file_write_full(fpin, "\n", nbytes, NULL);
 #else
     iova[0].iov_base = key;
     iova[0].iov_len = strlen(key);
@@ -1413,7 +1414,8 @@ static char *lookup_map_program(request_rec *r, apr_file_t *fpin,
     iova[1].iov_len = 1;
 
     niov = 2;
-    apr_file_writev(fpin, iova, niov, &nbytes);
+    /* XXX: error handling */
+    apr_file_writev_full(fpin, iova, niov, &nbytes);
 #endif
 
     buf = apr_palloc(r->pool, REWRITE_PRG_MAP_BUF + 1);