Gilad Arnold | 968bf19 | 2015-07-17 00:23:30 -0700 | [diff] [blame] | 1 | |
| 2 | |
| 3 | /* Copyright 1998 by the Massachusetts Institute of Technology. |
| 4 | * |
| 5 | * Permission to use, copy, modify, and distribute this |
| 6 | * software and its documentation for any purpose and without |
| 7 | * fee is hereby granted, provided that the above copyright |
| 8 | * notice appear in all copies and that both that copyright |
| 9 | * notice and this permission notice appear in supporting |
| 10 | * documentation, and that the name of M.I.T. not be used in |
| 11 | * advertising or publicity pertaining to distribution of the |
| 12 | * software without specific, written prior permission. |
| 13 | * M.I.T. makes no representations about the suitability of |
| 14 | * this software for any purpose. It is provided "as is" |
| 15 | * without express or implied warranty. |
| 16 | */ |
| 17 | |
| 18 | #include "ares_setup.h" |
| 19 | |
| 20 | #ifdef HAVE_LIMITS_H |
| 21 | # include <limits.h> |
| 22 | #endif |
| 23 | |
| 24 | #include "ares.h" |
| 25 | #include "ares_private.h" |
| 26 | |
| 27 | #ifndef HAVE_WRITEV |
| 28 | ssize_t ares_writev(ares_socket_t s, const struct iovec *iov, int iovcnt) |
| 29 | { |
| 30 | char *buffer, *bp; |
| 31 | int i; |
| 32 | size_t bytes = 0; |
| 33 | ssize_t result; |
| 34 | |
| 35 | /* Validate iovcnt */ |
| 36 | if (iovcnt <= 0) |
| 37 | { |
| 38 | SET_ERRNO(EINVAL); |
| 39 | return (-1); |
| 40 | } |
| 41 | |
| 42 | /* Validate and find the sum of the iov_len values in the iov array */ |
| 43 | for (i = 0; i < iovcnt; i++) |
| 44 | { |
| 45 | if (iov[i].iov_len > INT_MAX - bytes) |
| 46 | { |
| 47 | SET_ERRNO(EINVAL); |
| 48 | return (-1); |
| 49 | } |
| 50 | bytes += iov[i].iov_len; |
| 51 | } |
| 52 | |
| 53 | if (bytes == 0) |
| 54 | return (0); |
| 55 | |
| 56 | /* Allocate a temporary buffer to hold the data */ |
| 57 | buffer = malloc(bytes); |
| 58 | if (!buffer) |
| 59 | { |
| 60 | SET_ERRNO(ENOMEM); |
| 61 | return (-1); |
| 62 | } |
| 63 | |
| 64 | /* Copy the data into buffer */ |
| 65 | for (bp = buffer, i = 0; i < iovcnt; ++i) |
| 66 | { |
| 67 | memcpy (bp, iov[i].iov_base, iov[i].iov_len); |
| 68 | bp += iov[i].iov_len; |
| 69 | } |
| 70 | |
| 71 | /* Send buffer contents */ |
| 72 | result = swrite(s, buffer, bytes); |
| 73 | |
| 74 | free(buffer); |
| 75 | |
| 76 | return (result); |
| 77 | } |
| 78 | #endif |
| 79 | |