source3/lib/util_file.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * SMB parameters and setup
   4  * Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it under
   7  * the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 3 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "replace.h"
  21 #include "lib/util_file.h"
  22 #include "lib/util/debug.h"
  23 #include "lib/util/samba_util.h"
  24 #include "lib/util/sys_rw.h"
  25 #include "lib/util/sys_popen.h"
  26 #include "lib/async_req/async_sock.h"
  27 #include "lib/util/tevent_unix.h"
  28
  29 struct file_ploadv_state {
  30         struct tevent_context *ev;
  31         size_t maxsize;
  32         int fd;
  33         uint8_t *buf;
  34 };
  35
  36 static int file_ploadv_state_destructor(struct file_ploadv_state *s);
  37 static void file_ploadv_readable(struct tevent_req *subreq);
  38
  39 struct tevent_req *file_ploadv_send(TALLOC_CTX *mem_ctx,
  40                                    struct tevent_context *ev,
  41                                    char * const argl[], size_t maxsize)
  42 {
  43         struct tevent_req *req = NULL, *subreq = NULL;
  44         struct file_ploadv_state *state = NULL;
  45
  46         req = tevent_req_create(mem_ctx, &state, struct file_ploadv_state);
  47         if (req == NULL) {
  48                 return NULL;
  49         }
  50         state->ev = ev;
  51         state->maxsize = maxsize;
  52
  53         state->fd = sys_popenv(argl);
  54         if (state->fd == -1) {
  55                 tevent_req_error(req, errno);
  56                 return tevent_req_post(req, ev);
  57         }
  58         talloc_set_destructor(state, file_ploadv_state_destructor);
  59
  60         subreq = wait_for_read_send(state, state->ev, state->fd, false);
  61         if (tevent_req_nomem(subreq, req)) {
  62                 return tevent_req_post(req, ev);
  63         }
  64         tevent_req_set_callback(subreq, file_ploadv_readable, req);
  65         return req;
  66 }
  67
  68 static int file_ploadv_state_destructor(struct file_ploadv_state *s)
  69 {
  70         if (s->fd != -1) {
  71                 sys_pclose(s->fd);
  72                 s->fd = -1;
  73         }
  74         return 0;
  75 }
  76
  77 static void file_ploadv_readable(struct tevent_req *subreq)
  78 {
  79         struct tevent_req *req = tevent_req_callback_data(
  80                 subreq, struct tevent_req);
  81         struct file_ploadv_state *state = tevent_req_data(
  82                 req, struct file_ploadv_state);
  83         uint8_t buf[1024];
  84         uint8_t *tmp;
  85         ssize_t nread;
  86         size_t bufsize;
  87         int err;
  88         bool ok;
  89
  90         ok = wait_for_read_recv(subreq, &err);
  91         TALLOC_FREE(subreq);
  92         if (!ok) {
  93                 tevent_req_error(req, err);
  94                 return;
  95         }
  96
  97         nread = sys_read(state->fd, buf, sizeof(buf));
  98         if (nread == -1) {
  99                 tevent_req_error(req, errno);
 100                 return;
 101         }
 102         if (nread == 0) {
 103                 tevent_req_done(req);
 104                 return;
 105         }
 106
 107         bufsize = talloc_get_size(state->buf);
 108
 109         if (((bufsize + nread) < bufsize) ||
 110             ((bufsize + nread + 1) < bufsize)) {
 111                 /* overflow */
 112                 tevent_req_error(req, EMSGSIZE);
 113                 return;
 114         }
 115
 116         if ((state->maxsize != 0) && ((bufsize + nread) > state->maxsize)) {
 117                 tevent_req_error(req, EMSGSIZE);
 118                 return;
 119         }
 120
 121         tmp = talloc_realloc(state, state->buf, uint8_t, bufsize + nread + 1);
 122         if (tevent_req_nomem(tmp, req)) {
 123                 return;
 124         }
 125         state->buf = tmp;
 126
 127         memcpy(state->buf + bufsize, buf, nread);
 128         state->buf[bufsize+nread] = '\0';
 129
 130         subreq = wait_for_read_send(state, state->ev, state->fd, false);
 131         if (tevent_req_nomem(subreq, req)) {
 132                 return;
 133         }
 134         tevent_req_set_callback(subreq, file_ploadv_readable, req);
 135 }
 136
 137 int file_ploadv_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 138                     uint8_t **buf)
 139 {
 140         struct file_ploadv_state *state = tevent_req_data(
 141                 req, struct file_ploadv_state);
 142         int err;
 143
 144         if (tevent_req_is_unix_error(req, &err)) {
 145                 return err;
 146         }
 147         *buf = talloc_move(mem_ctx, &state->buf);
 148
 149         tevent_req_received(req);
 150
 151         return 0;
 152 }
 153
 154
 155 /**
 156  Load a pipe into memory and return an array of pointers to lines in the data
 157  must be freed with TALLOC_FREE.
 158 **/
 159
 160 char **file_lines_ploadv(TALLOC_CTX *mem_ctx,
 161                         char * const argl[],
 162                         int *numlines)
 163 {
 164         char *p = NULL;
 165         size_t size;
 166
 167         p = file_ploadv(argl, &size);
 168         if (!p) {
 169                 return NULL;
 170         }
 171
 172         return file_lines_parse(p, size, numlines, mem_ctx);
 173 }