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Fix: crashes due to malformed replies

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This commit is contained in:
Jason Benaim 2018-11-24 01:59:35 -08:00
parent 909e5c403e
commit 629708555c
1 changed files with 12 additions and 4 deletions
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16
comms.c
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@ -8,6 +8,8 @@
#include <unistd.h>
#include "comms.h"
#define RECV_BUF_SIZE 4096
bool hs100_encrypt(uint8_t *d, uint8_t *s, size_t len)
{
if(d == NULL)
@ -70,6 +72,10 @@ char *hs100_decode(uint8_t *s, size_t s_len)
uint32_t in_s_len;
memcpy(&in_s_len, s, 4);
in_s_len = ntohl(in_s_len);
if((s_len - 4) < in_s_len) {
// packet was cut short- adjust in_s_len
in_s_len = s_len - 4;
}
char *outbuf = calloc(1,in_s_len+1);
@ -105,10 +111,12 @@ char *hs100_send(char *servaddr, char *msg)
return NULL;
send(sock, s, s_len, 0);
uint8_t recvbuf[1024];
recv(sock, recvbuf, 1023, 0);
char *recvmsg = hs100_decode(recvbuf, 1023);
close(sock);
free(s);
uint8_t recvbuf[RECV_BUF_SIZE];
size_t received_size = recv(sock, recvbuf, RECV_BUF_SIZE, 0);
close(sock);
if(received_size == 0)
return NULL;
char *recvmsg = hs100_decode(recvbuf, received_size);
return recvmsg;
}