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141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
/*
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* Secure eXtended Message Passing framework
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* Secure eXtended Transport layer implementation: (libsxt)
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* - very similar to SSH2/TLS
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* - using already proven and tested crypto algos
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* - better than TLS for message passing
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*
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* (c) Alexander Vdolainen 2016 <avdolainen@zoho.com>
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*
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* libsxmp is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* libsxmp is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.";
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <sxt/safebuf.h>
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sxtsafebuffer_t *sxtsafebuffer_new(size_t size)
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{
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sxtsafebuffer_t *buf = NULL;
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if(size > (UINT_MAX - sizeof(sxtsafebuffer_t))) return NULL;
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if(!(buf = malloc(sizeof(sxtsafebuffer_t) + size))) return NULL;
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buf->size = htonl(size);
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buf->data[0] = 0;
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return buf;
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}
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int sxtsafebuffer_setdata(sxtsafebuffer_t *buf, const void *data, size_t size)
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{
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/* validate parameters */
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if(!buf || !data) return -1;
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if(!size || size > sxtsafebuffer_length(buf)) return -1;
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memcpy(buf->data, data, size);
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return 0;
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}
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size_t sxtsafebuffer_length(sxtsafebuffer_t *buf)
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{
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size_t size = 0;
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if(!buf) return size;
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else size = ntohl(buf->size);
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if((size > 0) && (size < UINT_MAX)) return size;
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return 0;
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}
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void sxtsafebuffer_destroy(sxtsafebuffer_t *buf)
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{
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if(!buf) return;
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buf->size = 0;
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memset((void *)buf->data, 0, sxtsafebuffer_length(buf));
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free(buf);
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return;
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}
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void *sxtsafebuffer_getdata(sxtsafebuffer_t *buf)
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{
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if(!buf) return NULL;
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return (void *)buf->data;
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}
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/* C string ops */
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const char *sxtsafebuffer_tocstr(sxtsafebuffer_t *buf)
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{
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if(!buf) return NULL;
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buf->data[sxtsafebuffer_length(buf)] = '\0';
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return (const char *)buf->data;;
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}
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sxtsafebuffer_t *sxtsafebuffer_new_fromcstr(const char *str)
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{
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size_t length;
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sxtsafebuffer_t *buf = NULL;
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if(!str) return NULL;
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else length = strlen(str);
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if(!(buf = sxtsafebuffer_new(length))) return NULL;
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else memcpy(buf->data, str, length);
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return buf;
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}
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/* returning value should be freed after use */
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char *sxtsafebuffer_getcstr(sxtsafebuffer_t *buf)
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{
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size_t length;
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char *str = NULL;
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if(!buf) return NULL;
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length = sxtsafebuffer_length(buf);
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if(length <= 0) return NULL;
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if(!(str = malloc(length + 1))) return NULL;
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else memcpy(str, buf->data, length);
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str[length] = '\0';
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return str;
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}
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void sxtsafebuffer_freecstr(char *str)
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{
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if(!str) return;
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memset(str, 0, strlen(str));
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free(str);
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return;
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}
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