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         struct tevent_req *subreq;
  32         size_t maxsize;
  33         int fd;
  34         uint8_t *buf;
  35 };
  36
  37 static void file_ploadv_cleanup_fn(
  38         struct tevent_req *req, enum tevent_req_state req_state);
  39 static void file_ploadv_readable(struct tevent_req *subreq);
  40
  41 struct tevent_req *file_ploadv_send(TALLOC_CTX *mem_ctx,
  42                                    struct tevent_context *ev,
  43                                    char * const argl[], size_t maxsize)
  44 {
  45         struct tevent_req *req = NULL;
  46         struct file_ploadv_state *state = NULL;
  47
  48         req = tevent_req_create(mem_ctx, &state, struct file_ploadv_state);
  49         if (req == NULL) {
  50                 return NULL;
  51         }
  52         state->ev = ev;
  53         state->maxsize = maxsize;
  54
  55         state->fd = sys_popenv(argl);
  56         if (state->fd == -1) {
  57                 tevent_req_error(req, errno);
  58                 return tevent_req_post(req, ev);
  59         }
  60         tevent_req_set_cleanup_fn(req, file_ploadv_cleanup_fn);
  61
  62         state->subreq = wait_for_read_send(state, state->ev, state->fd, false);
  63         if (tevent_req_nomem(state->subreq, req)) {
  64                 return tevent_req_post(req, ev);
  65         }
  66         tevent_req_set_callback(state->subreq, file_ploadv_readable, req);
  67         return req;
  68 }
  69
  70 static void file_ploadv_cleanup_fn(
  71         struct tevent_req *req, enum tevent_req_state req_state)
  72 {
  73         struct file_ploadv_state *state = tevent_req_data(
  74                 req, struct file_ploadv_state);
  75
  76         TALLOC_FREE(state->subreq);
  77         if (state->fd != -1) {
  78                 sys_pclose(state->fd);
  79                 state->fd = -1;
  80         }
  81 }
  82
  83 static void file_ploadv_readable(struct tevent_req *subreq)
  84 {
  85         struct tevent_req *req = tevent_req_callback_data(
  86                 subreq, struct tevent_req);
  87         struct file_ploadv_state *state = tevent_req_data(
  88                 req, struct file_ploadv_state);
  89         uint8_t buf[1024];
  90         uint8_t *tmp;
  91         ssize_t nread;
  92         size_t bufsize;
  93         int err;
  94         bool ok;
  95
  96         ok = wait_for_read_recv(subreq, &err);
  97         TALLOC_FREE(subreq);
  98         state->subreq = NULL;
  99         if (!ok) {
 100                 tevent_req_error(req, err);
 101                 return;
 102         }
 103
 104         nread = sys_read(state->fd, buf, sizeof(buf));
 105         if (nread == -1) {
 106                 tevent_req_error(req, errno);
 107                 return;
 108         }
 109         if (nread == 0) {
 110                 tevent_req_done(req);
 111                 return;
 112         }
 113
 114         bufsize = talloc_get_size(state->buf);
 115         if (bufsize > 0) {
 116                 /*
 117                  * Last round we've added the trailing '\0'. Remove it
 118                  * for this round.
 119                  */
 120                 bufsize -= 1;
 121         }
 122
 123         if (((bufsize + nread) < bufsize) ||
 124             ((bufsize + nread + 1) < bufsize)) {
 125                 /* overflow */
 126                 tevent_req_error(req, EMSGSIZE);
 127                 return;
 128         }
 129
 130         if ((state->maxsize != 0) && ((bufsize + nread) > state->maxsize)) {
 131                 tevent_req_error(req, EMSGSIZE);
 132                 return;
 133         }
 134
 135         tmp = talloc_realloc(state, state->buf, uint8_t, bufsize + nread + 1);
 136         if (tevent_req_nomem(tmp, req)) {
 137                 return;
 138         }
 139         state->buf = tmp;
 140
 141         memcpy(state->buf + bufsize, buf, nread);
 142         state->buf[bufsize+nread] = '\0';
 143
 144         state->subreq = wait_for_read_send(state, state->ev, state->fd, false);
 145         if (tevent_req_nomem(state->subreq, req)) {
 146                 return;
 147         }
 148         tevent_req_set_callback(state->subreq, file_ploadv_readable, req);
 149 }
 150
 151 int file_ploadv_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 152                     uint8_t **buf)
 153 {
 154         struct file_ploadv_state *state = tevent_req_data(
 155                 req, struct file_ploadv_state);
 156         int err;
 157
 158         if (tevent_req_is_unix_error(req, &err)) {
 159                 return err;
 160         }
 161         *buf = talloc_move(mem_ctx, &state->buf);
 162
 163         tevent_req_received(req);
 164
 165         return 0;
 166 }
 167
 168
 169 /**
 170  Load a pipe into memory and return an array of pointers to lines in the data
 171  must be freed with TALLOC_FREE.
 172 **/
 173
 174 char **file_lines_ploadv(TALLOC_CTX *mem_ctx,
 175                         char * const argl[],
 176                         int *numlines)
 177 {
 178         char *p = NULL;
 179         size_t size;
 180
 181         p = file_ploadv(argl, &size);
 182         if (!p) {
 183                 return NULL;
 184         }
 185
 186         return file_lines_parse(p, size, numlines, mem_ctx);
 187 }