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httpd: optional support for partial downloads

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This commit is contained in:
Denis Vlasenko 2007-09-21 22:35:18 +00:00
parent bcceb0c5a4
commit f431017535
3 changed files with 128 additions and 17 deletions
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9
networking/Config.in
View File

@ -83,6 +83,15 @@ config HTTPD
help
Serve web pages via an HTTP server.
config FEATURE_HTTPD_RANGES
bool "Support 'Ranges:' header"
default n
depends on HTTPD
help
Makes httpd emit "Accept-Ranges: bytes" header and understand
"Range: bytes=NNN-[MMM]" header. Allows for resuming interrupted
downloads, seeking in multimedia players etc.
config FEATURE_HTTPD_USE_SENDFILE
bool "Use sendfile system call"
default n

119
networking/httpd.c
View File

@ -138,6 +138,7 @@ typedef struct Htaccess_IP {
enum {
HTTP_OK = 200,
HTTP_PARTIAL_CONTENT = 206,
HTTP_MOVED_TEMPORARILY = 302,
HTTP_BAD_REQUEST = 400, /* malformed syntax */
HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
@ -165,6 +166,9 @@ enum {
static const uint16_t http_response_type[] ALIGN2 = {
HTTP_OK,
#if ENABLE_FEATURE_HTTPD_RANGES
HTTP_PARTIAL_CONTENT,
#endif
HTTP_MOVED_TEMPORARILY,
HTTP_REQUEST_TIMEOUT,
HTTP_NOT_IMPLEMENTED,
@ -192,7 +196,10 @@ static const struct {
const char *info;
} http_response[ARRAY_SIZE(http_response_type)] = {
{ "OK", NULL },
{ "Found", "Directories must end with a slash" }, /* ?? */
#if ENABLE_FEATURE_HTTPD_RANGES
{ "Partial Content", NULL },
#endif
{ "Found", NULL },
{ "Request Timeout", "No request appeared within 60 seconds" },
{ "Not Implemented", "The requested method is not recognized" },
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
@ -214,13 +221,13 @@ static const struct {
#endif
};
struct globals {
int verbose; /* must be int (used by getopt32) */
smallint flg_deny_all;
unsigned rmt_ip; /* used for IP-based allow/deny rules */
time_t last_mod;
off_t ContentLength; /* -1 - unknown */
char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
const char *bind_addr_or_port;
@ -237,6 +244,13 @@ struct globals {
USE_FEATURE_HTTPD_CGI(char *referer;)
USE_FEATURE_HTTPD_CGI(char *user_agent;)
off_t file_size; /* -1 - unknown */
#if ENABLE_FEATURE_HTTPD_RANGES
off_t range_start;
off_t range_end;
off_t range_len;
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
Htaccess *g_auth; /* config user:password lines */
#endif
@ -264,13 +278,18 @@ struct globals {
#define home_httpd (G.home_httpd )
#define found_mime_type (G.found_mime_type )
#define found_moved_temporarily (G.found_moved_temporarily)
#define ContentLength (G.ContentLength )
#define last_mod (G.last_mod )
#define ip_a_d (G.ip_a_d )
#define g_realm (G.g_realm )
#define remoteuser (G.remoteuser )
#define referer (G.referer )
#define user_agent (G.user_agent )
#define file_size (G.file_size )
#if ENABLE_FEATURE_HTTPD_RANGES
#define range_start (G.range_start )
#define range_end (G.range_end )
#define range_len (G.range_len )
#endif
#define rmt_ip_str (G.rmt_ip_str )
#define g_auth (G.g_auth )
#define mime_a (G.mime_a )
@ -283,9 +302,17 @@ struct globals {
PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
bind_addr_or_port = "80"; \
ContentLength = -1; \
file_size = -1; \
} while (0)
#if !ENABLE_FEATURE_HTTPD_RANGES
enum {
range_start = 0,
range_end = MAXINT(off_t) - 1,
range_len = MAXINT(off_t),
};
#endif
#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
@ -921,10 +948,26 @@ static void send_headers(int responseNum)
}
#endif
if (ContentLength != -1) { /* file */
if (file_size != -1) { /* file */
strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
len += sprintf(iobuf + len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
tmp_str, "Content-length:", ContentLength);
#if ENABLE_FEATURE_HTTPD_RANGES
if (responseNum == HTTP_PARTIAL_CONTENT) {
len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
range_start,
range_end,
file_size);
file_size = range_end - range_start + 1;
}
#endif
len += sprintf(iobuf + len,
#if ENABLE_FEATURE_HTTPD_RANGES
"Accept-Ranges: bytes\r\n"
#endif
"Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
tmp_str,
"Content-length:",
file_size
);
}
iobuf[len++] = '\r';
iobuf[len++] = '\n';
@ -1373,7 +1416,7 @@ static void send_file_and_exit(const char *url, int headers)
const char *try_suffix;
ssize_t count;
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
off_t offset = 0;
off_t offset;
#endif
suffix = strrchr(url, '.');
@ -1415,6 +1458,26 @@ static void send_file_and_exit(const char *url, int headers)
if (headers)
send_headers_and_exit(HTTP_NOT_FOUND);
}
#if ENABLE_FEATURE_HTTPD_RANGES
if (!headers)
range_start = 0; /* err pages and ranges don't mix */
range_len = MAXINT(off_t);
if (range_start) {
if (!range_end) {
range_end = file_size - 1;
}
if (range_end < range_start
|| lseek(f, range_start, SEEK_SET) != range_start
) {
lseek(f, 0, SEEK_SET);
range_start = 0;
} else {
range_len = range_end - range_start + 1;
send_headers(HTTP_PARTIAL_CONTENT);
headers = 0;
}
}
#endif
if (headers)
send_headers(HTTP_OK);
@ -1424,24 +1487,32 @@ static void send_file_and_exit(const char *url, int headers)
signal(SIGPIPE, SIG_IGN);
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
offset = range_start;
do {
/* byte count (3rd arg) is rounded down to 64k */
count = sendfile(1, f, &offset, MAXINT(ssize_t) - 0xffff);
/* sz is rounded down to 64k */
ssize_t sz = MAXINT(ssize_t) - 0xffff;
USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
count = sendfile(1, f, &offset, sz);
if (count < 0) {
if (offset == 0)
if (offset == range_start)
goto fallback;
goto fin;
}
} while (count > 0);
USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
} while (count > 0 && range_len);
log_and_exit();
fallback:
#endif
while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
ssize_t n = count;
count = full_write(1, iobuf, count);
ssize_t n;
USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
n = full_write(1, iobuf, count);
if (count != n)
break;
USE_FEATURE_HTTPD_RANGES(range_len -= count;)
if (!range_len)
break;
}
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
fin:
@ -1781,6 +1852,23 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
credentials = checkPerm(urlcopy, tptr);
}
#endif /* FEATURE_HTTPD_BASIC_AUTH */
#if ENABLE_FEATURE_HTTPD_RANGES
if (STRNCASECMP(iobuf, "Range:") == 0) {
// We know only bytes=NNN-[MMM]
char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
if (strncmp(s, "bytes=", 6) == 0) {
s += sizeof("bytes=")-1;
range_start = BB_STRTOOFF(s, &s, 10);
if (s[0] != '-' || range_start < 0) {
range_start = 0;
} else if (s[1]) {
range_end = BB_STRTOOFF(s+1, NULL, 10);
if (errno || range_end < range_start)
range_start = 0;
}
}
}
#endif
} /* while extra header reading */
}
@ -1833,8 +1921,7 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
if (urlp[-1] == '/')
strcpy(urlp, "index.html");
if (stat(tptr, &sb) == 0) {
/* It's a dir URL and there is index.html */
ContentLength = sb.st_size;
file_size = sb.st_size;
last_mod = sb.st_mtime;
}
#if ENABLE_FEATURE_HTTPD_CGI

17
shell/ash.c
View File

@ -2494,6 +2494,7 @@ pwdcmd(int argc, char **argv)
#define DQSYNTAX 1 /* in double quotes */
#define SQSYNTAX 2 /* in single quotes */
#define ARISYNTAX 3 /* in arithmetic */
#define PSSYNTAX 4 /* prompt */
#if ENABLE_ASH_OPTIMIZE_FOR_SIZE
#define USE_SIT_FUNCTION
@ -9886,6 +9887,9 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
smallint dblquote;
smallint oldstyle;
smallint prevsyntax; /* syntax before arithmetic */
#if ENABLE_ASH_EXPAND_PRMT
smallint pssyntax; /* we are expanding a prompt string */
#endif
int varnest; /* levels of variables expansion */
int arinest; /* levels of arithmetic expansion */
int parenlevel; /* levels of parens in arithmetic */
@ -9910,6 +9914,11 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
dblquote = (syntax == DQSYNTAX);
oldstyle = 0;
prevsyntax = 0;
#if ENABLE_ASH_EXPAND_PRMT
pssyntax = (syntax == PSSYNTAX);
if (pssyntax)
syntax = DQSYNTAX;
#endif
varnest = 0;
arinest = 0;
parenlevel = 0;
@ -9948,6 +9957,12 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
if (doprompt)
setprompt(2);
} else {
#if ENABLE_ASH_EXPAND_PRMT
if (c == '$' && pssyntax) {
USTPUTC(CTLESC, out);
USTPUTC('\\', out);
}
#endif
if (dblquote &&
c != '\\' && c != '`' &&
c != '$' && (
@ -10780,7 +10795,7 @@ expandstr(const char *ps)
/* XXX Fix (char *) cast. */
setinputstring((char *)ps);
readtoken1(pgetc(), DQSYNTAX, nullstr, 0);
readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
popfile();
n.narg.type = NARG;