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#include "helper.h"
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <glib/gmacros.h>
#include <fcntl.h>
#include "../config.h"
/**
* Parse IPv4 or IPv6 address in string representation to a suitable format usable by the BSD socket library
* @string eg. "1.2.3.4" or "2a01::10:5", optially with port appended, eg "1.2.3.4:6666" or "[2a01::10:5]:6666"
* @af will contain either AF_INET or AF_INET6
* @addr will contain the address in network representation
* @port will contain the port in network representation, defaulting to #define PORT if none was given
* returns 1 on success, 0 in failure. contents of af, addr and port are undefined in the latter case
* !! Contents of @string might be modified by this function !!
*/
char parse_address(char *string, dnbd3_host_t *host)
{
struct in_addr v4;
struct in6_addr v6;
// Try IPv4 without port
if (1 == inet_pton(AF_INET, string, &v4))
{
host->type = AF_INET;
memcpy(host->addr, &v4, 4);
host->port = htons(PORT);
return 1;
}
// Try IPv6 without port
if (1 == inet_pton(AF_INET6, string, &v6))
{
host->type = AF_INET6;
memcpy(host->addr, &v6, 16);
host->port = htons(PORT);
return 1;
}
// Scan for port
char *portpos = NULL, *ptr = string;
while (*ptr)
{
if (*ptr == ':')
portpos = ptr;
++ptr;
}
if (portpos == NULL)
return 0; // No port in string
// Consider IP being surrounded by [ ]
if (*string == '[' && *(portpos - 1) == ']')
{
++string;
*(portpos - 1) = '\0';
}
*portpos++ = '\0';
int p = atoi(portpos);
if (p < 1 || p > 65535)
return 0; // Invalid port
host->port = htons((uint16_t)p);
// Try IPv4 with port
if (1 == inet_pton(AF_INET, string, &v4))
{
host->type = AF_INET;
memcpy(host->addr, &v4, 4);
return 1;
}
// Try IPv6 with port
if (1 == inet_pton(AF_INET6, string, &v6))
{
host->type = AF_INET6;
memcpy(host->addr, &v6, 16);
return 1;
}
// FAIL
return 0;
}
/**
* Convert a host and port (network byte order) to printable representation.
* Worst case required buffer len is 48, eg. [1234:1234:1234:1234:1234:1234:1234:1234]:12345 (+ \0)
* Returns TRUE on success, FALSE on error
*/
char host_to_string(const dnbd3_host_t *host, char *target, size_t targetlen)
{
// Worst case: Port 5 chars, ':' to separate ip and port 1 char, terminating null 1 char = 7, [] for IPv6
if (targetlen < 10)
return FALSE;
if (host->type == AF_INET6)
{
*target++ = '[';
inet_ntop(AF_INET6, host->addr, target, targetlen - 9);
target += strlen(target);
*target++ = ']';
}
else if (host->type == AF_INET)
{
inet_ntop(AF_INET, host->addr, target, targetlen - 7);
target += strlen(target);
}
else
{
snprintf(target, targetlen, "<?addrtype=%d>", (int)host->type);
return FALSE;
}
*target = '\0';
if (host->port != 0)
{
// There are still at least 7 bytes left in the buffer, port is at most 5 bytes + ':' + '\0' = 7
snprintf(target, 7, ":%d", (int)ntohs(host->port));
}
return TRUE;
}
char is_valid_namespace(char *namespace)
{
if (*namespace == '\0' || *namespace == '/')
return 0; // Invalid: Length = 0 or starting with a slash
while (*namespace)
{
if (*namespace != '/' && *namespace != '-' && (*namespace < 'a' || *namespace > 'z')
&& (*namespace < 'A' || *namespace > 'Z')
&& (*namespace < '0' || *namespace > '9'))
return 0;
++namespace;
}
if (strstr(namespace, "//") != NULL)
return 0; // Invalid: Double slash
if (*(namespace - 1) == '/')
return 0; // Invalid: Ends in a slash
return 1;
}
char is_valid_imagename(char *namespace)
{
if (*namespace == '\0' || *namespace == ' ')
return 0; // Invalid: Length = 0 or starting with a space
while (*namespace)
{
// Check for invalid chars
if (*namespace != '.' && *namespace != '-' && *namespace != ' '
&& *namespace != '(' && *namespace != ')'
&& (*namespace < 'a' || *namespace > 'z') && (*namespace < 'A' || *namespace > 'Z')
&& (*namespace < '0' || *namespace > '9'))
return 0;
++namespace;
}
if (*(namespace - 1) == ' ')
return 0; // Invalid: Ends in a space
return 1;
}
void strtolower(char *string)
{
while (*string)
{
if (*string >= 'A' && *string <= 'Z')
*string += 32;
++string;
}
}
void remove_trailing_slash(char *string)
{
char *ptr = string + strlen(string) - 1;
while (ptr >= string && *ptr == '/')
*ptr-- = '\0';
}
int file_exists(char *file)
{
int fd = open(file, O_RDONLY);
if (fd < 0)
return FALSE;
close(fd);
return TRUE;
}
int file_writable(char *file)
{
int fd = open(file, O_WRONLY);
if (fd >= 0)
{
close(fd);
return TRUE;
}
fd = open(file, O_WRONLY | O_CREAT, 0600);
if (fd < 0)
return FALSE;
close(fd);
unlink(file);
return TRUE;
}
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