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#ifdef __linux__
#define _POSIX_C_SOURCE 200809L
#define _DEFAULT_SOURCE
#endif
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <syslog.h>
#include <limits.h>
#include <errno.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <sys/param.h>
#endif
#include "handlers.h"
#include "packet.h"
#include "netascii.h"
nbd_opmode get_mode(char *mode) {
nbd_opmode opmode;
if (strncmp(mode, (char *)&"netascii", NBD_NBTPD_ARGS_MODE_MAX) == 0) {
opmode = NETASCII;
} else if (strncmp(mode, (char *)&"octal", NBD_NBTPD_ARGS_MODE_MAX) == 0) {
opmode = OCTAL;
} else if (strncmp(mode, (char *)&"mail", NBD_NBTPD_ARGS_MODE_MAX) == 0) {
opmode = MAIL;
} else {
opmode = NOT_FOUND;
}
return opmode;
}
void *read_req_resp(void *args) {
char *fname = NULL, *wd = NULL, *buf = NULL;
FILE *fp = NULL;
nbd_nbtpd_args *argptr = (nbd_nbtpd_args *)args;
if (!is_netascii_str((char *)&argptr->path)) {
argptr->err = 1;
goto pre_socket;
}
fname = realpath((char *)&argptr->path, NULL);
if (fname == NULL) {
syslog(LOG_ERR, "unable to get real path: %s", strerror(errno));
argptr->err = 1;
goto pre_socket;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* POSIX does not define what happens when getcwd() is given NULL. *
* This means that illumos libc and GNU libc both return a newly *
* malloc()'d string, while FreeBSD libc does not. Also, FreeBSD uses *
* constant MAXPATHLEN defined in <sys/param.h> rather than PATH_MAX. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifdef __FreeBSD__
wd = malloc(MAXPATHLEN);
if (wd == NULL) {
syslog(LOG_ERR, "unable to allocate PATH_MAX memory: %s", strerror(errno));
argptr->err = 0;
goto pre_socket;
}
if (getcwd(wd, MAXPATHLEN) == NULL) {
argptr->err = 0;
goto pre_socket;
}
#else
if ((wd = getcwd(NULL, PATH_MAX)) == NULL) {
argptr->err = 0;
goto pre_socket;
}
#endif
if (!strncmp(wd, fname, sizeof(wd) - 1)) {
argptr->err = 2;
goto pre_socket;
}
if (!is_netascii_str((char *)&argptr->mode)) {
argptr->err = 4;
goto pre_socket;
}
nbd_opmode opmode = get_mode((char *)&argptr->mode);
if ((opmode != NETASCII) && (opmode != OCTAL)) {
argptr->err = 4;
goto pre_socket;
}
fp = fopen(fname, "r");
buf = malloc(512);
if (buf == NULL) {
syslog(
LOG_CRIT,
"failed to allocate memory: %s",
strerror(errno)
);
argptr->err = 0;
goto pre_socket;
}
memset(buf, '\0', 512);
int s = socket(AF_INET, SOCK_DGRAM, 0);
if (s <= 0) {
syslog(LOG_ERR, "unable to define socket: %s", strerror(errno));
goto cleanup;
}
if (connect(s, (struct sockaddr *)&argptr->client, sizeof(struct sockaddr)) < 0) {
syslog(
LOG_ERR,
"unable to connect to client %s: %s",
inet_ntoa(argptr->client.sin_addr),
strerror(errno)
);
goto socket_clean;
}
socket_clean:
close(s);
cleanup:
fclose(fp);
free(buf);
free(fname);
free(wd);
free(args);
return (void *)NULL;
pre_socket:
if (fp != NULL) {
fclose(fp);
}
free(buf);
free(fname);
free(wd);
return nbd_nbtpd_resp_error(args);
}
void *write_req_resp(void *args) {
free(args);
return (void *)NULL;
}
void *nbd_nbtpd_resp_error(void *args) {
//TODO: open socket and scream error, then cleanup.
free(args);
return (void *)NULL;
}
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