src/network_write_no_mmap.c

   1 #include "first.h"
   2
   3 #include "network_backends.h"
   4
   5 #include "network.h"
   6 #include "fdevent.h"
   7 #include "log.h"
   8 #include "stat_cache.h"
   9
  10 #include "sys-socket.h"
  11
  12 #include <sys/time.h>
  13 #include <stdlib.h>
  14
  15 #include <fcntl.h>
  16 #include <sys/stat.h>
  17 #include <unistd.h>
  18
  19 #include <errno.h>
  20 #include <string.h>
  21
  22 int network_open_file_chunk(server *srv, connection *con, chunkqueue *cq) {
  23         chunk* const c = cq->first;
  24         off_t offset, toSend;
  25         struct stat st;
  26         UNUSED(con);
  27
  28         force_assert(NULL != c);
  29         force_assert(FILE_CHUNK == c->type);
  30         force_assert(c->offset >= 0 && c->offset <= c->file.length);
  31
  32         offset = c->file.start + c->offset;
  33         toSend = c->file.length - c->offset;
  34
  35         if (-1 == c->file.fd) {
  36                 if (-1 == (c->file.fd = fdevent_open_cloexec(c->file.name->ptr, O_RDONLY, 0))) {
  37                         log_error_write(srv, __FILE__, __LINE__, "ssb", "open failed:", strerror(errno), c->file.name);
  38                         return -1;
  39                 }
  40         }
  41
  42         /*(skip file size checks if file is temp file created by lighttpd)*/
  43         if (c->file.is_temp) return 0;
  44
  45         if (-1 == fstat(c->file.fd, &st)) {
  46                 log_error_write(srv, __FILE__, __LINE__, "ss", "fstat failed:", strerror(errno));
  47                 return -1;
  48         }
  49
  50         if (offset > st.st_size || toSend > st.st_size || offset > st.st_size - toSend) {
  51                 log_error_write(srv, __FILE__, __LINE__, "sb", "file shrunk:", c->file.name);
  52                 return -1;
  53         }
  54
  55         return 0;
  56 }
  57
  58 int network_write_file_chunk_no_mmap(server *srv, connection *con, int fd, chunkqueue *cq, off_t *p_max_bytes) {
  59         chunk* const c = cq->first;
  60         off_t offset, toSend;
  61         ssize_t r;
  62
  63         force_assert(NULL != c);
  64         force_assert(FILE_CHUNK == c->type);
  65         force_assert(c->offset >= 0 && c->offset <= c->file.length);
  66
  67         offset = c->file.start + c->offset;
  68         toSend = c->file.length - c->offset;
  69         if (toSend > 64*1024) toSend = 64*1024; /* max read 64kb in one step */
  70         if (toSend > *p_max_bytes) toSend = *p_max_bytes;
  71
  72         if (0 == toSend) {
  73                 chunkqueue_remove_finished_chunks(cq);
  74                 return 0;
  75         }
  76
  77         if (0 != network_open_file_chunk(srv, con, cq)) return -1;
  78
  79         buffer_string_prepare_copy(srv->tmp_buf, toSend);
  80
  81         if (-1 == lseek(c->file.fd, offset, SEEK_SET)) {
  82                 log_error_write(srv, __FILE__, __LINE__, "ss", "lseek: ", strerror(errno));
  83                 return -1;
  84         }
  85         if (-1 == (toSend = read(c->file.fd, srv->tmp_buf->ptr, toSend))) {
  86                 log_error_write(srv, __FILE__, __LINE__, "ss", "read: ", strerror(errno));
  87                 return -1;
  88         }
  89
  90 #if defined(__WIN32)
  91         if ((r = send(fd, srv->tmp_buf->ptr, toSend, 0)) < 0) {
  92                 int lastError = WSAGetLastError();
  93                 switch (lastError) {
  94                 case WSAEINTR:
  95                 case WSAEWOULDBLOCK:
  96                         break;
  97                 case WSAECONNRESET:
  98                 case WSAETIMEDOUT:
  99                 case WSAECONNABORTED:
 100                         return -2;
 101                 default:
 102                         log_error_write(srv, __FILE__, __LINE__, "sdd",
 103                                 "send failed: ", lastError, fd);
 104                         return -1;
 105                 }
 106         }
 107 #else /* __WIN32 */
 108         if ((r = write(fd, srv->tmp_buf->ptr, toSend)) < 0) {
 109                 switch (errno) {
 110                 case EAGAIN:
 111                 case EINTR:
 112                         break;
 113                 case EPIPE:
 114                 case ECONNRESET:
 115                         return -2;
 116                 default:
 117                         log_error_write(srv, __FILE__, __LINE__, "ssd",
 118                                 "write failed:", strerror(errno), fd);
 119                         return -1;
 120                 }
 121         }
 122 #endif /* __WIN32 */
 123
 124         if (r >= 0) {
 125                 *p_max_bytes -= r;
 126                 chunkqueue_mark_written(cq, r);
 127         }
 128
 129         return (r > 0 && r == toSend) ? 0 : -3;
 130 }