On Tue, Mar 23, 2010 at 09:18:21AM +0100, Gabor Juhos wrote:
>If the type of the first answer does not match with the requested type,
>then the dotted name will be freed. If there are no further answers in
>the DNS reply, this pointer will be used later on in the same function.
>Additionally it is passed to the caller, and may cause strange behaviour.
>
>For example, the following busybox commands are triggering a segmentation
>fault with uClibc 0.9.30.x
I cannot reproduce this with attached test program with 0.9.31-rc1 (or
current master)?
#include <string.h>
#include <stdio.h>
#include <netdb.h>
#include <sys/socket.h>
int main(int argc, char**argv) {
unsigned int addr_count = 0;
char addr[1024];
#ifdef NAME2
char *chp;
struct hostent *result;
if (argc < 2 || argv[argc-1] == NULL) return 1;
result = gethostbyname2(argv[argc-1],AF_INET);
if (!result) return 2;
printf("name : %s\nfam : %d\naddrlen: %d\n", result->h_name, result->h_addrtype, result->h_length);
while (result->h_addr_list[addr_count]) {
inet_ntop(result->h_addrtype, result->h_addr_list[addr_count++], &addr, sizeof(addr));
printf("addr : %s\n", addr);
}
printf("total %d addresses\n", addr_count);
printf("aliases:");
chp = *result->h_aliases;
while ((chp = *(result->h_aliases++)))
printf(" %s", chp);
printf("\n");
return 0;
#else
char buf[1024];
struct hostent rbuf, *result;
int herrno, ret;
char *chp;
if (argc < 2 || argv[argc-1] == NULL) return 1;
memset(&rbuf, 0, sizeof rbuf);
ret = gethostbyname_r(argv[argc-1], &rbuf, buf, sizeof(buf), &result, &herrno);
if (ret || !result) return 2;
printf("name : %s\nfam : %d\naddrlen: %d\n", result->h_name, result->h_addrtype, result->h_length);
while (result->h_addr_list[addr_count]) {
inet_ntop(result->h_addrtype, result->h_addr_list[addr_count++], &addr, sizeof(addr));
printf("addr : %s\n", addr);
}
printf("total %d addresses\n", addr_count);
printf("aliases:");
chp = *result->h_aliases;
while ((chp = *(result->h_aliases++)))
printf(" %s", chp);
printf("\n");
return ret;
#endif
}
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