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httpfs2.c
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/*
* HTTPFS: import a file from a web server to local file system
* the main use is, to mount an iso on a web server with loop device
*
* depends on:
* FUSE: Filesystem in Userspace
* Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
*
* This program can be distributed under the terms of the GNU GPL.
*
*/
/*
* (c) 2006 hmb marionraven at users.sourceforge.net
*
*/
/*
* Modified to work with fuse 2.7.
* Added keepalive
* The passthru functionality removed to simplify the code.
* (c) 2008-2011 Michal Suchanek <hramrach@centrum.cz>
*
*/
#define FUSE_USE_VERSION 26
#include <fuse_lowlevel.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/dir.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <time.h>
#include <stddef.h>
#include <inttypes.h>
#ifdef USE_THREAD
#include <pthread.h>
static pthread_key_t url_key;
#define FUSE_LOOP fuse_session_loop_mt
#else
#define FUSE_LOOP fuse_session_loop
#endif
#ifdef USE_SSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif
#define TIMEOUT 30
#define CONSOLE "/dev/console"
#define HEADER_SIZE 1024
#define VERSION "0.1.4 \"Monolith\""
static char* argv0;
#define MAX_REQUEST (32*1024)
#define SOCK_CLOSED 0
#define SOCK_OPEN 1
#define SOCK_KEEPALIVE 2
typedef struct url {
int proto;
long timeout;
char * host; /*hostname*/
int port;
char * path; /*get path*/
char * name; /*file name*/
char * filename; /*content file name*/
int filename_from_header; /* take filename from HTTP header */
#ifdef USE_AUTH
char * auth; /*encoded auth data*/
#endif
#ifdef RETRY_ON_RESET
int retry_reset; /*retry reset connections*/
#endif
int sockfd;
int sock_type;
#ifdef USE_SSL
SSL_CTX* ssl_ctx;
SSL* ssl;
#endif
char * req_buf;
size_t req_buf_size;
off_t file_size;
time_t last_modified;
} struct_url;
static struct_url main_url;
static off_t get_stat(struct_url*, struct stat * stbuf);
static ssize_t get_data(struct_url*, off_t start, size_t size);
static int open_client_socket(struct_url *url);
static int close_client_socket(struct_url *url);
static int close_client_force(struct_url *url);
static struct_url * thread_setup(void);
static void destroy_url_copy(void *);
/* Protocol symbols. */
#define PROTO_HTTP 0
#define PROTO_HTTPS 1
#ifdef USE_SSL
#endif
#ifdef USE_AUTH
static char b64_encode_table[64] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', /* 0-7 */
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', /* 8-15 */
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', /* 16-23 */
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', /* 24-31 */
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 32-39 */
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', /* 40-47 */
'w', 'x', 'y', 'z', '0', '1', '2', '3', /* 48-55 */
'4', '5', '6', '7', '8', '9', '+', '/' /* 56-63 */
};
/* Do base-64 encoding on a hunk of bytes. Return pointer to the
** bytes generated. Base-64 encoding takes up 4/3 the space of the original,
** plus a bit for end-padding. 3/2+5 gives a safe margin.
*/
static char * b64_encode(unsigned const char* ptr, long len) {
char * space;
int ptr_idx;
int c = 0;
int d = 0;
int space_idx = 0;
int phase = 0;
/*FIXME calculate the occupied space properly*/
size_t size = ((size_t)len * 3) /2 + 5;
space = malloc(size+1);
space[size] = 0;
for (ptr_idx = 0; ptr_idx < len; ++ptr_idx) {
switch (phase++) {
case 0:
c = ptr[ptr_idx] >> 2;
d = (ptr[ptr_idx] & 0x3) << 4;
break;
case 1:
c = d | (ptr[ptr_idx] >> 4);
d = (ptr[ptr_idx] & 0xf) << 2;
break;
case 2:
c = d | (ptr[ptr_idx] >> 6);
if (space_idx < size) space[space_idx++] = b64_encode_table[c];
c = ptr[ptr_idx] & 0x3f;
break;
}
space[space_idx++] = b64_encode_table[c];
if (space_idx == size) return space;
phase %= 3;
}
if (phase != 0) {
space[space_idx++] = b64_encode_table[d];
if (space_idx == size) return space;
/* Pad with ='s. */
while (phase++ > 0) {
space[space_idx++] = '=';
if (space_idx == size) return space;
phase %= 3;
}
}
return space;
}
#endif /* USE_AUTH */
/*
* The FUSE operations originally ripped from the hello_ll sample.
*/
static int httpfs_stat(fuse_ino_t ino, struct stat *stbuf)
{
stbuf->st_ino = ino;
switch (ino) {
case 1:
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
break;
case 2: {
struct_url * url = thread_setup();
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 1;
return (int) get_stat(url, stbuf);
}; break;
default:
errno = ENOENT;
return -1;
}
return 0;
}
static void httpfs_getattr(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
struct stat stbuf;
(void) fi;
memset(&stbuf, 0, sizeof(stbuf));
if (httpfs_stat(ino, &stbuf) < 0)
assert(errno),fuse_reply_err(req, errno);
else
fuse_reply_attr(req, &stbuf, 1.0);
}
static void httpfs_lookup(fuse_req_t req, fuse_ino_t parent, const char *name)
{
struct fuse_entry_param e;
memset(&e, 0, sizeof(e));
e.attr_timeout = 1.0;
e.entry_timeout = 1.0;
if (parent != 1 || strcmp(name, main_url.filename) != 0){
e.ino = 0;
} else {
e.ino = 2;
if(httpfs_stat(e.ino, &e.attr) < 0){
assert(errno);
fuse_reply_err(req, errno);
return;
}
}
fuse_reply_entry(req, &e);
}
struct dirbuf {
char *p;
size_t size;
};
static void dirbuf_add(fuse_req_t req, struct dirbuf *b, const char *name,
fuse_ino_t ino)
{
struct stat stbuf;
size_t oldsize = b->size;
b->size += fuse_add_direntry(req, NULL, 0, name, NULL, 0);
b->p = (char *) realloc(b->p, b->size);
memset(&stbuf, 0, sizeof(stbuf));
stbuf.st_ino = ino;
fuse_add_direntry(req, b->p + oldsize, b->size - oldsize, name, &stbuf,
(off_t) b->size);
}
#define min(x, y) ((x) < (y) ? (x) : (y))
static int reply_buf_limited(fuse_req_t req, const char *buf, size_t bufsize,
off_t off, size_t maxsize)
{
assert(off >= 0);
if (off < bufsize)
return fuse_reply_buf(req, buf + off,
min(bufsize - (size_t)off, maxsize));
else
return fuse_reply_buf(req, NULL, 0);
}
static void httpfs_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
(void) fi;
if (ino != 1)
fuse_reply_err(req, ENOTDIR);
else {
struct dirbuf b;
memset(&b, 0, sizeof(b));
dirbuf_add(req, &b, ".", 1);
dirbuf_add(req, &b, "..", 1);
dirbuf_add(req, &b, main_url.filename, 2);
reply_buf_limited(req, b.p, b.size, off, size);
free(b.p);
}
}
static void httpfs_open(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
if (ino != 2)
fuse_reply_err(req, EISDIR);
else if ((fi->flags & 3) != O_RDONLY)
fuse_reply_err(req, EACCES);
else{
/* direct_io is supposed to allow partial reads. However, setting
* the flag causes read length max at 4096 bytes which leads to
* *many* requests, poor performance, and errors. Some resources
* like TCP ports are recycled too fast for Linux to cope.
*/
//fi->direct_io = 1;
fuse_reply_open(req, fi);
}
}
static void httpfs_read(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
(void) fi;
struct_url * url = thread_setup();
ssize_t res;
assert(ino == 2);
assert(url->file_size >= off);
size=min(size, (size_t)(url->file_size - off));
if(url->file_size == off) {
/* Handling of EOF is not well documented, returning EOF as error
* does not work but this does. */
fuse_reply_buf(req, NULL, 0);
return;
}
/* since we have to return all stuff requested the buffer cannot be
* allocated in advance */
if(url->req_buf
&& ( (url->req_buf_size < size )
|| ( (url->req_buf_size > size )
&& (url->req_buf_size > MAX_REQUEST) ) ) ){
free(url->req_buf);
url->req_buf = 0;
}
if(! url->req_buf){
url->req_buf_size = size;
url->req_buf = malloc(size);
}
fprintf(stderr, "httpfs_read: size: %d b (%d kb), off: %d b (%d kb)\n", url->req_buf_size, url->req_buf_size/1024, (int)off, (int)(off/1024));
if((res = get_data(url, off, size)) < 0){
assert(errno);
fuse_reply_err(req, errno);
}else{
fuse_reply_buf(req, url->req_buf, (size_t)res);
}
}
static struct fuse_lowlevel_ops httpfs_oper = {
.lookup = httpfs_lookup,
.getattr = httpfs_getattr,
.readdir = httpfs_readdir,
.open = httpfs_open,
.read = httpfs_read,
};
/*
* A few utility functions
*/
#ifdef NEED_STRNDUP
static char * strndup(const char * str, size_t n){
if(n > strlen(str)) n = strlen(str);
char * res = malloc(n + 1);
memcpy(res, str, n);
res[n] = 0;
return res;
}
#endif
static int mempref(const char * mem, const char * pref, size_t size)
{
/* return true if found */
if (size < strlen(pref)) return 0;
return ! memcmp(mem, pref, strlen(pref));
}
static void errno_report(const char * where)
{
int e = errno;
fprintf(stderr, "%s: %s: %d %s.\n", argv0, where, errno, strerror(errno));
errno = e;
}
static char * url_encode(char * path) {
return strdup(path); /*FIXME encode*/
}
/*
* functions for handling struct_url
*/
static int init_url(struct_url* url)
{
memset(url, 0, sizeof(url));
url->sock_type = SOCK_CLOSED;
url->timeout = TIMEOUT;
return 0;
}
static int free_url(struct_url* url)
{
if(url->host) free(url->host);
url->host = 0;
if(url->path) free(url->path);
url->path = 0;
if(url->name) free(url->name);
url->name = 0;
#ifdef USE_AUTH
if(url->auth) free(url->auth);
url->auth = 0;
#endif
if(url->sock_type != SOCK_CLOSED)
close_client_force(url);
url->port = 0;
url->proto = 0; /* only after socket closed */
url->file_size=0;
url->last_modified=0;
return 0;
}
static void print_url(FILE *f, const struct_url * url)
{
char * protocol = "?!?";
switch(url->proto){
case PROTO_HTTP:
protocol = "http";
break;;
case PROTO_HTTPS:
protocol = "https";
break;;
}
fprintf(f, "file name: \t%s\n", url->name);
fprintf(f, "content file name: \t%s\n", url->filename);
fprintf(f, "host name: \t%s\n", url->host);
fprintf(f, "port number: \t%d\n", url->port);
fprintf(f, "protocol: \t%s\n", protocol);
fprintf(f, "request path: \t%s\n", url->path);
#ifdef USE_AUTH
fprintf(f, "auth data: \t%s\n", url->auth ? "(present)" : "(null)");
#endif
}
static int parse_url(const char * url, struct_url* res)
{
const char * url_orig = url;
char* http = "http://";
#ifdef USE_SSL
char* https = "https://";
#endif /* USE_SSL */
int path_start = '/';
assert(url);
if (strncmp(http, url, strlen(http)) == 0) {
url += strlen(http);
res->proto = PROTO_HTTP;
res->port = 80;
#ifdef USE_SSL
} else if (strncmp(https, url, strlen(https)) == 0) {
url += strlen(https);
res->proto = PROTO_HTTPS;
res->port = 443;
#endif /* USE_SSL */
} else {
fprintf(stderr, "Invalid protocol in url: %s\n", url_orig);
return -1;
}
/* determine if path was given */
if(strchr(url, path_start))
res->path = url_encode(strchr(url, path_start));
else{
path_start = 0;
res->path = strdup("/");
}
#ifdef USE_AUTH
/* Get user and password */
if(strchr(url, '@') && (strchr(url, '@') < strchr(url, path_start))){
res->auth = b64_encode((unsigned char *)url, strchr(url, '@') - url);
url = strchr(url, '@') + 1;
}else{
res->auth = 0;
}
#endif /* USE_AUTH */
/* Get port number. */
int host_end = path_start;
if(strchr(url, ':') && (strchr(url, ':') < strchr(url, path_start))){
/* FIXME check that port is a valid numeric value */
res->port = atoi(strchr(url, ':') + 1);
if (! res->port) {
fprintf(stderr, "Invalid port in url: %s\n", url_orig);
return -1;
}
host_end = ':';
}
/* Get the host name. */
if (url == strchr(url, host_end)){ /*no hastname in the url */
fprintf(stderr, "No hostname in url: %s\n", url_orig);
return -1;
}
res->host = strndup(url, (size_t)(strchr(url, host_end) - url));
/* Get the file name. */
url = strchr(url, path_start);
const char * end = url + strlen(url);
end--;
/* Handle broken urls with multiple slashes. */
while((end > url) && (*end == '/')) end--;
end++;
if((path_start == 0) || (end == url)
|| (strncmp(url, "/", (size_t)(end - url)) == 0)){
res->name = strdup(res->host);
}else{
while(strchr(url, '/') && (strchr(url, '/') < end))
url = strchr(url, '/') + 1;
res->name = strndup(url, (size_t)(end - url));
}
res->filename = res->name;
return res->proto;
}
static void usage(void)
{
fprintf(stderr, "%s >>> Version: %s <<<\n", __FILE__, VERSION);
fprintf(stderr, "usage: %s [-c [console]] [-f] [-t timeout] [-r] url mount-parameters\n\n", argv0);
fprintf(stderr, "\t -c \tuse console for standard input/output/error (default: %s)\n", CONSOLE);
fprintf(stderr, "\t -f \tstay in foreground - do not fork\n");
#ifdef RETRY_ON_RESET
fprintf(stderr, "\t -r \tretry connection on reset\n");
#endif
fprintf(stderr, "\t -n \ttake filename from HTTP header (default: from url)\n");
fprintf(stderr, "\t -t \tset socket timeout in seconds (default: %i)\n", TIMEOUT);
fprintf(stderr, "\tmount-parameters should include the mount point\n");
}
#define shift { if(!argv[1]) { usage(); return 4; };\
argc--; argv[1] = argv[0]; argv = argv + 1;}
int main(int argc, char *argv[])
{
char * fork_terminal = CONSOLE;
int do_fork = 1;
putenv("TZ=");/*UTC*/
argv0 = argv[0];
init_url(&main_url);
while( argv[1] && (*(argv[1]) == '-') )
{
char * arg = argv[1]; shift;
while (*++arg){
switch (*arg){
case 'c': if( *(argv[1]) != '-' ) {
fork_terminal = argv[1]; shift;
}else{
fork_terminal = 0;
}
break;
case 'n': main_url.filename_from_header = 1;
break;
#ifdef RETRY_ON_RESET
case 'r': main_url.retry_reset = 1;
break;
#endif
case 't': {
char * end = " ";
if( isdigit(*(argv[1]))) {
main_url.timeout = strtol(argv[1], &end, 0);
/* now end should point to '\0' */
}
if(*end){
usage();
fprintf(stderr, "'%s' is not a number.\n",
argv[0]);
return 4;
}
shift;
}
break;
case 'f': do_fork = 0;
break;
default:
usage();
fprintf(stderr, "Unknown option '%c'.\n", *arg);
return 4;
}
}
}
if (argc < 3) {
usage();
return 1;
}
if(parse_url(argv[1], &main_url) == -1){
fprintf(stderr, "invalid url: %s\n", argv[1]);
return 2;
}
//print_url(stderr, &main_url);
int sockfd = open_client_socket(&main_url);
if(sockfd < 0) {
fprintf(stderr, "Connection failed.\n");
return 3;
}
close_client_socket(&main_url);
struct stat st;
off_t size = get_stat(&main_url, &st);
print_url(stderr, &main_url);
if(size >= 0) {
fprintf(stderr, "file size: \t%" PRIdMAX "\n", (intmax_t)size);
}else{
return 3;
}
shift;
if(fork_terminal && access(fork_terminal, O_RDWR)){
errno_report(fork_terminal);
fork_terminal=0;
}
#ifdef USE_THREAD
close_client_force(&main_url); /* each thread should open its own socket */
pthread_key_create(&url_key, &destroy_url_copy);
#endif
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
struct fuse_chan *ch;
char *mountpoint;
int err = -1;
int fork_res = 0;
if (fuse_parse_cmdline(&args, &mountpoint, NULL, NULL) != -1 &&
(ch = fuse_mount(mountpoint, &args)) != NULL) {
/* try to fork at some point where the setup is mostly done */
/* FIXME try to close std* and the like ? */
if(do_fork) fork_res = fork();
switch (fork_res) {
case 0:
{
if(fork_terminal){
/* if we can access the console use it */
int fd = open(fork_terminal, O_RDONLY);
dup2(fd, 0);
close (fd);
fd = open(fork_terminal, O_WRONLY);
dup2(fd, 1);
close (fd);
fd = open(fork_terminal, O_WRONLY|O_SYNC);
dup2(fd, 2);
close (fd);
}
struct fuse_session *se;
se = fuse_lowlevel_new(&args, &httpfs_oper,
sizeof(httpfs_oper), NULL);
if (se != NULL) {
if (fuse_set_signal_handlers(se) != -1) {
fuse_session_add_chan(se, ch);
err = FUSE_LOOP(se);
fuse_remove_signal_handlers(se);
fuse_session_remove_chan(ch);
}
fuse_session_destroy(se);
}
fuse_unmount(mountpoint, ch);
}
break;;
case -1:
errno_report("fork");
break;;
default:
err = 0;
break;;
}
}
fuse_opt_free_args(&args);
return err ? err : 0;
}
/*
* Socket operations that abstract ssl and keepalive as much as possible.
* Keepalive is set when parsing the headers.
*
*/
static int close_client_socket(struct_url *url) {
if (url->sock_type == SOCK_KEEPALIVE) return SOCK_KEEPALIVE;
return close_client_force(url);
}
static int close_client_force(struct_url *url) {
if(url->sock_type != SOCK_CLOSED){
#ifdef USE_SSL
if (url->proto == PROTO_HTTPS) {
SSL_free(url->ssl);
SSL_CTX_free(url->ssl_ctx);
/* FIXME ssl errors
* The openssl documentation says they can be collected here but
* they are probably seen as read/write errors anyway.. */
}
#endif
close(url->sockfd);
}
return url->sock_type = SOCK_CLOSED;
}
#ifdef USE_THREAD
static void destroy_url_copy(void * urlptr)
{
if(urlptr){
fprintf(stderr, "%s: Thread %08lX ended.\n", argv0, pthread_self());
close_client_force(urlptr);
free(urlptr);
}
}
static void * create_url_copy(const struct_url * url)
{
void * res = malloc(sizeof(struct_url));
memcpy(res, url, sizeof(struct_url));
return res;
}
static struct_url * thread_setup(void)
{
struct_url * res = pthread_getspecific(url_key);
if(!res) {
fprintf(stderr, "%s: Thread %08lX started.\n", argv0, pthread_self());
res = create_url_copy(&main_url);
pthread_setspecific(url_key, res);
}
return res;
}
#else /*USE_THREAD*/
static struct_url * thread_setup(void) { return &main_url; }
#endif
static ssize_t read_client_socket(struct_url *url, void * buf, size_t len) {
ssize_t res;
struct timeval timeout;
timeout.tv_sec = url->timeout;
timeout.tv_usec = 0;
setsockopt(url->sockfd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
#ifdef USE_SSL
if (url->proto == PROTO_HTTPS)
res = SSL_read(url->ssl, buf, len);
else
#endif
res = read(url->sockfd, buf, len);
if(res <= 0) errno_report("read");
return res;
}
static ssize_t
write_client_socket(struct_url *url, const void * buf, size_t len)
{
do {
int fd = open_client_socket(url);
ssize_t res;
if(fd < 0) return -1; /*error hopefully reported by open*/
#ifdef USE_SSL
if (url->proto == PROTO_HTTPS)
res = SSL_write(url->ssl, buf, len);
else
#endif
res = write(url->sockfd, buf, len);
if(res <= 0) errno_report("write");
if ( !(res <= 0) || (url->sock_type != SOCK_KEEPALIVE )) return res;
/* retry a failed keepalive socket */
close_client_force(url);
} while (url->sock_type == SOCK_KEEPALIVE);
return -1; /*should not reach*/
}
/*
* Function yields either a positive int after connecting to
* host 'hostname' on port 'port' or < 0 in case of error
*
* It handles keepalive by not touching keepalive sockets.
* The SSL context is created so that read/write can use it.
*
* hostname is something like 'www.tmtd.de' or 192.168.0.86
* port is expected in machine order (not net order)
*
* ((Flonix defines USE_IPV6))
*
*/
#if defined(AF_INET6) && defined(IN6_IS_ADDR_V4MAPPED)
#define USE_IPV6
#endif
static int open_client_socket(struct_url *url) {
#ifdef USE_IPV6
struct addrinfo hints;
char portstr[10];
int gaierr;
struct addrinfo* ai;
struct addrinfo* aiv4;
struct addrinfo* aiv6 = 0;
struct sockaddr_in6 sa;
#else /* USE_IPV6 */
struct hostent *he;
struct sockaddr_in sa;
#endif /* USE_IPV6 */
socklen_t sa_len;
int sock_family, sock_type, sock_protocol;
if(url->sock_type == SOCK_KEEPALIVE) return url->sock_type;
if(url->sock_type != SOCK_CLOSED) close_client_socket(url);
(void) memset((void*) &sa, 0, sizeof(sa));
#ifdef USE_IPV6
(void) memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
(void) snprintf(portstr, sizeof(portstr), "%d", (int) url->port);
if ((gaierr = getaddrinfo(url->host, portstr, &hints, &ai)) != 0) {
(void) fprintf(stderr, "%s: getaddrinfo %s - %s\n",
argv0, url->host, gai_strerror(gaierr));
return -1;
}
/* Find the first IPv4 and IPv6 entries. */
for (aiv4 = ai; aiv4 != NULL; aiv4 = aiv4->ai_next) {
if (aiv4->ai_family == AF_INET)
break;
if ((aiv4->ai_family == AF_INET6) && (aiv6 == NULL))
aiv6 = aiv4;
}
/* If there's an IPv4 address, use that, otherwise try IPv6. */
if (aiv4 == NULL)
aiv4 = aiv6;
if (aiv4 == NULL) {
(void) fprintf(stderr, "%s: no valid address found for host %s\n",
argv0, url->host);
errno = EIO;
return -1;
}
if (sizeof(sa) < aiv4->ai_addrlen) {
(void) fprintf(stderr, "%s - sockaddr too small (%lu < %lu)\n",
url->host, (unsigned long) sizeof(sa),
(unsigned long) aiv4->ai_addrlen);
errno = EIO;
return -1;
}
sock_family = aiv4->ai_family;
sock_type = aiv4->ai_socktype;
sock_protocol = aiv4->ai_protocol;
sa_len = aiv4->ai_addrlen;
(void) memmove(&sa, aiv4->ai_addr, sa_len);
freeaddrinfo(ai);
#else /* USE_IPV6 */
he = gethostbyname(url->host);
if (he == NULL) {
(void) fprintf(stderr, "%s: unknown host - %s\n", argv0, url->host);
errno = EIO;
return -1;
}
sock_family = sa.sin_family = he->h_addrtype;
sock_type = SOCK_STREAM;
sock_protocol = 0;
sa_len = sizeof(sa);
(void) memmove(&sa.sin_addr, he->h_addr, he->h_length);
sa.sin_port = htons(url->port);
#endif /* USE_IPV6 */
url->sockfd = socket(sock_family, sock_type, sock_protocol);
if (url->sockfd < 0) {
errno_report("couldn't get socket");
return -1;
}
if (connect(url->sockfd, (struct sockaddr*) &sa, sa_len) < 0) {
errno_report("couldn't connect socket");
return -1;
}
#ifdef USE_SSL
if ((url->proto) == PROTO_HTTPS) {
/* Make SSL connection. */
int r;
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
url->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
url->ssl = SSL_new(url->ssl_ctx);
SSL_set_fd(url->ssl, url->sockfd);
r = SSL_connect(url->ssl);
if (r <= 0) {
close(url->sockfd);
(void) fprintf(stderr, "%s: %s:%d - SSL connection failed - %d\n",
argv0, url->host, url->port, r);
ERR_print_errors_fp(stderr);
errno = EIO;
return -1;
}
}
#endif
return url->sock_type = SOCK_OPEN;
}
static void
plain_report(const char * reason, const char * method,
const char * buf, size_t len)
{
fprintf(stderr, "%s: %s: %s\n", argv0, method, reason);
fwrite(buf, len, 1, stderr);
if(len && ( *(buf+len-1) != '\n')) fputc('\n', stderr);
}
/*
* Scan the received header for interesting fields. Since C does not have
* tools for working with potentially unterminated strings this is quite
* long and ugly.
*
* Return the length of the header in case part of the data was
* read with the header.
* Content-Length means different thing whith GET and HEAD.
*/
static ssize_t
parse_header(struct_url *url, const char * buf, size_t bytes,
const char * method, off_t * content_length, int expect)
{
/* FIXME check the header parser */
int status;
const char * ptr = buf;
const char * end;
int seen_accept = 0, seen_length = 0, seen_close = 0, seen_filename = 0;
if (bytes <= 0) {
return -1;
}
end = memchr(ptr, '\n', bytes);
if(!end) {
plain_report ( "reply does not contain newline!", method, buf, 0);
errno = EIO;
return -1;
}
end = ptr;
while(1){
end = memchr(end + 1, '\n', bytes - (size_t)(end - ptr));
if(!end || ((end + 1) >= (ptr + bytes)) ) {
plain_report ("reply does not contain end of header!",
method, buf, bytes);
errno = EIO;
return -1;
}
if(mempref(end, "\n\r\n", bytes - (size_t)(end - ptr))) break;
}
ssize_t header_len = (end + 3) - ptr;
end = memchr(ptr, '\n', bytes);
char * http = "HTTP/1.1 ";
if(!mempref(ptr, http, (size_t)(end - ptr)) || !isdigit( *(ptr + strlen(http))) ) {
plain_report ("reply does not contain status!",
method, buf, (size_t)header_len);
errno = EIO;
return -1;
}
status = (int)strtol( ptr + strlen(http), (char **)&ptr, 10);
if (status != expect) {
fprintf(stderr, "%s: %s: failed with status: %d%.*s.\n",
argv0, method, status, (int)((end - ptr) - 1), ptr);
if (!strcmp("HEAD", method)) fwrite(buf, bytes, 1, stderr); /*DEBUG*/
errno = EIO;
if (status == 404) errno = ENOENT;
return -1;
}
char * content_length_str = "Content-Length: ";
char * accept = "Accept-Ranges: bytes";
char * date = "Last-Modified: ";
char * content_disposition_str = "Content-Disposition: attachment; filename=\"";
char * close = "Connection: close";
struct tm tm;
while(1)