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resolve hostname

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This commit is contained in:
folkert van heusden 2023-03-21 22:38:28 +01:00
parent cd55079217
commit 06d4373fc7
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
2 changed files with 34 additions and 12 deletions
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33
disk_backend_nbd.cpp
View file

@ -12,16 +12,9 @@
disk_backend_nbd::disk_backend_nbd(const std::string & host, const int port) :
fd(socket(AF_INET, SOCK_STREAM, 0))
host(host),
port(port)
{
struct addrinfo hints, *res;
int status;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
char *host = "esp-942daf.local";
char *port = "5556";
status = getaddrinfo(host, port, &hints, &res)
}
disk_backend_nbd::~disk_backend_nbd()
@ -29,6 +22,28 @@ disk_backend_nbd::~disk_backend_nbd()
close(fd);
}
bool disk_backend_nbd::begin()
{
addrinfo *res = nullptr;
addrinfo hints { 0 };
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
char port_str[8] { 0 };
snprintf(port_str, sizeof port_str, "%d", port);
int rc = getaddrinfo(host.c_str(), port_str, &hints, &res);
if (rc != 0) {
DOLOG(ll_error, true, "disk_backend_nbd: cannot resolve \"%s\":%s: %s", host.c_str(), port_str, gai_strerror(rc));
return false;
}
return true;
}
bool disk_backend_nbd::read(const off_t offset, const size_t n, uint8_t *const target)
{
DOLOG(debug, false, "disk_backend_nbd::read: read %zu bytes from offset %zu", n, offset);

13
disk_backend_nbd.h
View file

@ -1,4 +1,7 @@
#include <netdb.h>
#include <string>
#include <sys/socket.h>
#include <sys/types.h>
#include "disk_backend.h"
@ -6,13 +9,17 @@
class disk_backend_nbd : public disk_backend
{
private:
const int fd { -1 };
const std::string host;
const int port;
int fd { -1 };
public:
disk_backend_nbd(const std::string & host, const int port);
virtual ~disk_backend_nbd();
bool read(const off_t offset, const size_t n, uint8_t *const target);
bool begin() override;
bool write(const off_t offset, const size_t n, const uint8_t *const from);
bool read(const off_t offset, const size_t n, uint8_t *const target) override;
bool write(const off_t offset, const size_t n, const uint8_t *const from) override;
};