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 file_size, offset, toSend;
  25
  26         force_assert(NULL != c);
  27         force_assert(FILE_CHUNK == c->type);
  28         force_assert(c->offset >= 0 && c->offset <= c->file.length);
  29
  30         offset = c->file.start + c->offset;
  31         toSend = c->file.length - c->offset;
  32
  33         if (-1 == c->file.fd) {
  34                 stat_cache_entry *sce = NULL;
  35
  36                 if (HANDLER_ERROR == stat_cache_get_entry(srv, con, c->file.name, &sce)) {
  37                         log_error_write(srv, __FILE__, __LINE__, "ssb", "stat-cache failed:", strerror(errno), c->file.name);
  38                         return -1;
  39                 }
  40
  41                 if (-1 == (c->file.fd = fdevent_open_cloexec(c->file.name->ptr, O_RDONLY, 0))) {
  42                         log_error_write(srv, __FILE__, __LINE__, "ssb", "open failed:", strerror(errno), c->file.name);
  43                         return -1;
  44                 }
  45
  46                 file_size = sce->st.st_size;
  47         } else {
  48                 struct stat st;
  49                 if (-1 == fstat(c->file.fd, &st)) {
  50                         log_error_write(srv, __FILE__, __LINE__, "ss", "fstat failed:", strerror(errno));
  51                         return -1;
  52                 }
  53                 file_size = st.st_size;
  54         }
  55
  56         if (offset > file_size || toSend > file_size || offset > file_size - toSend) {
  57                 log_error_write(srv, __FILE__, __LINE__, "sb", "file was shrinked:", c->file.name);
  58                 return -1;
  59         }
  60
  61         return 0;
  62 }
  63
  64 int network_write_file_chunk_no_mmap(server *srv, connection *con, int fd, chunkqueue *cq, off_t *p_max_bytes) {
  65         chunk* const c = cq->first;
  66         off_t offset, toSend;
  67         ssize_t r;
  68
  69         force_assert(NULL != c);
  70         force_assert(FILE_CHUNK == c->type);
  71         force_assert(c->offset >= 0 && c->offset <= c->file.length);
  72
  73         offset = c->file.start + c->offset;
  74         toSend = c->file.length - c->offset;
  75         if (toSend > 64*1024) toSend = 64*1024; /* max read 64kb in one step */
  76         if (toSend > *p_max_bytes) toSend = *p_max_bytes;
  77
  78         if (0 == toSend) {
  79                 chunkqueue_remove_finished_chunks(cq);
  80                 return 0;
  81         }
  82
  83         if (0 != network_open_file_chunk(srv, con, cq)) return -1;
  84
  85         buffer_string_prepare_copy(srv->tmp_buf, toSend);
  86
  87         if (-1 == lseek(c->file.fd, offset, SEEK_SET)) {
  88                 log_error_write(srv, __FILE__, __LINE__, "ss", "lseek: ", strerror(errno));
  89                 return -1;
  90         }
  91         if (-1 == (toSend = read(c->file.fd, srv->tmp_buf->ptr, toSend))) {
  92                 log_error_write(srv, __FILE__, __LINE__, "ss", "read: ", strerror(errno));
  93                 return -1;
  94         }
  95
  96 #if defined(__WIN32)
  97         if ((r = send(fd, srv->tmp_buf->ptr, toSend, 0)) < 0) {
  98                 int lastError = WSAGetLastError();
  99                 switch (lastError) {
 100                 case WSAEINTR:
 101                 case WSAEWOULDBLOCK:
 102                         break;
 103                 case WSAECONNRESET:
 104                 case WSAETIMEDOUT:
 105                 case WSAECONNABORTED:
 106                         return -2;
 107                 default:
 108                         log_error_write(srv, __FILE__, __LINE__, "sdd",
 109                                 "send failed: ", lastError, fd);
 110                         return -1;
 111                 }
 112         }
 113 #else /* __WIN32 */
 114         if ((r = write(fd, srv->tmp_buf->ptr, toSend)) < 0) {
 115                 switch (errno) {
 116                 case EAGAIN:
 117                 case EINTR:
 118                         break;
 119                 case EPIPE:
 120                 case ECONNRESET:
 121                         return -2;
 122                 default:
 123                         log_error_write(srv, __FILE__, __LINE__, "ssd",
 124                                 "write failed:", strerror(errno), fd);
 125                         return -1;
 126                 }
 127         }
 128 #endif /* __WIN32 */
 129
 130         if (r >= 0) {
 131                 *p_max_bytes -= r;
 132                 chunkqueue_mark_written(cq, r);
 133         }
 134
 135         return (r > 0 && r == toSend) ? 0 : -3;
 136 }