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Diffstat (limited to 'networking')
-rw-r--r--networking/httpd.c255
1 files changed, 107 insertions, 148 deletions
diff --git a/networking/httpd.c b/networking/httpd.c
index 2ac19cf..35aa492 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -133,7 +133,6 @@ struct globals {
int server_socket;
int accepted_socket;
int verbose;
- volatile smallint alarm_signaled;
smallint flg_deny_all;
unsigned rmt_ip;
@@ -172,7 +171,6 @@ struct globals {
#define server_socket (G.server_socket )
#define accepted_socket (G.accepted_socket )
#define verbose (G.verbose )
-#define alarm_signaled (G.alarm_signaled )
#define flg_deny_all (G.flg_deny_all )
#define rmt_ip (G.rmt_ip )
#define tcp_port (G.tcp_port )
@@ -920,6 +918,13 @@ static int sendHeaders(HttpResponseNum responseNum)
return full_write(i, iobuf, len);
}
+static void send_headers_and_exit(HttpResponseNum responseNum) ATTRIBUTE_NORETURN;
+static void send_headers_and_exit(HttpResponseNum responseNum)
+{
+ sendHeaders(responseNum);
+ _exit(0);
+}
+
/*
* Read from the socket until '\n' or EOF. '\r' chars are removed.
* '\n' is replaced with NUL.
@@ -976,8 +981,6 @@ static void send_cgi_and_exit(
struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
char *argp[] = { NULL, NULL };
int pid = 0;
- int inFd;
- int outFd;
int buf_count;
int status;
size_t post_read_size, post_read_idx;
@@ -1104,15 +1107,16 @@ static void send_cgi_and_exit(
/* set execve argp[0] without path */
argp[0] = (char*)bb_basename(purl);
- /* but script argp[0] must have absolute path and chdiring to this */
+ /* but script argp[0] must have absolute path */
script = strrchr(fullpath, '/');
if (!script)
goto error_execing_cgi;
*script = '\0';
+ /* chdiring to script's dir */
if (chdir(fullpath) == 0) {
- // Now run the program. If it fails,
- // use _exit() so no destructors
- // get called and make a mess.
+ /* Now run the program. If it fails,
+ * use _exit() so no destructors
+ * get called and make a mess. */
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
char *interpr = NULL;
char *suffix = strrchr(purl, '.');
@@ -1136,7 +1140,8 @@ static void send_cgi_and_exit(
execv(fullpath, argp);
}
error_execing_cgi:
- /* send to stdout (even if we are not from inetd) */
+ /* send to stdout
+ * (we are CGI here, our stdout is pumped to the net) */
accepted_socket = 1;
sendHeaders(HTTP_NOT_FOUND);
_exit(242);
@@ -1146,10 +1151,11 @@ static void send_cgi_and_exit(
buf_count = 0;
post_read_size = 0;
post_read_idx = 0; /* for gcc */
- inFd = fromCgi.rd;
- outFd = toCgi.wr;
close(fromCgi.wr);
close(toCgi.rd);
+
+ /* If CGI dies, we still want to correctly finish reading its output
+ * and send it to the peer. So please no SIGPIPEs! */
signal(SIGPIPE, SIG_IGN);
while (1) {
@@ -1159,12 +1165,17 @@ static void send_cgi_and_exit(
int nfound;
int count;
+ /* This loop still looks messy. What is an exit criteria?
+ * "CGI's output closed"? Or "CGI has exited"?
+ * What to do if CGI has closed both input and output, but
+ * didn't exit? etc... */
+
FD_ZERO(&readSet);
FD_ZERO(&writeSet);
- FD_SET(inFd, &readSet);
+ FD_SET(fromCgi.rd, &readSet);
if (bodyLen > 0 || post_read_size > 0) {
- FD_SET(outFd, &writeSet);
- nfound = outFd > inFd ? outFd : inFd;
+ FD_SET(toCgi.wr, &writeSet);
+ nfound = toCgi.wr > fromCgi.rd ? toCgi.wr : fromCgi.rd;
if (post_read_size == 0) {
FD_SET(accepted_socket, &readSet);
if (nfound < accepted_socket)
@@ -1174,10 +1185,10 @@ static void send_cgi_and_exit(
nfound = select(nfound + 1, &readSet, &writeSet, NULL, NULL);
} else {
if (!bodyLen) {
- close(outFd); /* no more POST data to CGI */
+ close(toCgi.wr); /* no more POST data to CGI */
bodyLen = -1;
}
- nfound = select(inFd + 1, &readSet, NULL, NULL, NULL);
+ nfound = select(fromCgi.rd + 1, &readSet, NULL, NULL, NULL);
}
if (nfound <= 0) {
@@ -1186,24 +1197,26 @@ static void send_cgi_and_exit(
* are ready, yet select returned?! */
continue;
}
- close(inFd);
+ close(fromCgi.rd);
if (DEBUG && WIFEXITED(status))
- bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
+ bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
if (DEBUG && WIFSIGNALED(status))
- bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
+ bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
break;
}
- if (post_read_size > 0 && FD_ISSET(outFd, &writeSet)) {
+ if (post_read_size > 0 && FD_ISSET(toCgi.wr, &writeSet)) {
/* Have data from peer and can write to CGI */
- // huh? why full_write? what if we will block?
- // (imagine that CGI does not read its stdin...)
- count = full_write(outFd, wbuf + post_read_idx, post_read_size);
+ count = safe_write(toCgi.wr, wbuf + post_read_idx, post_read_size);
+ /* Doesn't happen, we dont use nonblocking IO here
+ *if (count < 0 && errno == EAGAIN) {
+ * ...
+ *} else */
if (count > 0) {
post_read_idx += count;
post_read_size -= count;
} else {
- post_read_size = bodyLen = 0; /* broken pipe to CGI */
+ post_read_size = bodyLen = 0; /* EOF/broken pipe to CGI */
}
} else if (bodyLen > 0 && post_read_size == 0
&& FD_ISSET(accepted_socket, &readSet)
@@ -1226,7 +1239,7 @@ static void send_cgi_and_exit(
#if PIPESIZE >= MAX_MEMORY_BUF
# error "PIPESIZE >= MAX_MEMORY_BUF"
#endif
- if (FD_ISSET(inFd, &readSet)) {
+ if (FD_ISSET(fromCgi.rd, &readSet)) {
/* There is something to read from CGI */
int s = accepted_socket;
char *rbuf = iobuf;
@@ -1245,7 +1258,7 @@ static void send_cgi_and_exit(
* CGI may output a few first bytes and then wait
* for POSTDATA without closing stdout.
* With full_read we may wait here forever. */
- count = safe_read(inFd, rbuf + buf_count, PIPESIZE - 8);
+ count = safe_read(fromCgi.rd, rbuf + buf_count, PIPESIZE - 8);
if (count <= 0) {
/* eof (or error) and there was no "HTTP",
* so write it, then write received data */
@@ -1285,7 +1298,7 @@ static void send_cgi_and_exit(
buf_count = -1; /* buffering off */
}
} else {
- count = safe_read(inFd, rbuf, PIPESIZE);
+ count = safe_read(fromCgi.rd, rbuf, PIPESIZE);
if (count <= 0)
break; /* eof (or error) */
}
@@ -1293,7 +1306,7 @@ static void send_cgi_and_exit(
break;
if (DEBUG)
fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
- } /* if (FD_ISSET(inFd)) */
+ } /* if (FD_ISSET(fromCgi.rd)) */
} /* while (1) */
_exit(0);
}
@@ -1338,15 +1351,14 @@ static void send_file_and_exit(const char *url)
#endif /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
if (DEBUG)
- fprintf(stderr, "sending file '%s' content-type: %s\n",
+ bb_error_msg("sending file '%s' content-type: %s",
url, found_mime_type);
f = open(url, O_RDONLY);
if (f < 0) {
if (DEBUG)
bb_perror_msg("cannot open '%s'", url);
- sendHeaders(HTTP_NOT_FOUND);
- _exit(0);
+ send_headers_and_exit(HTTP_NOT_FOUND);
}
sendHeaders(HTTP_OK);
@@ -1354,13 +1366,13 @@ static void send_file_and_exit(const char *url)
if (fd == 0)
fd++; /* write to fd #1 in inetd mode */
- /* If you want to know about EPIPEs below
- * (happen if you abort downloads from local httpd) */
- /*signal(SIGPIPE, SIG_IGN);*/
+ /* If you want to know about EPIPE below
+ * (happens if you abort downloads from local httpd): */
+ /* signal(SIGPIPE, SIG_IGN); */
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
do {
- /* byte count is rounded down to 64k */
+ /* byte count (3rd arg) is rounded down to 64k */
count = sendfile(fd, f, &offset, MAXINT(ssize_t) - 0xffff);
if (count < 0) {
if (offset == 0)
@@ -1372,8 +1384,7 @@ static void send_file_and_exit(const char *url)
fallback:
#endif
- /* TODO: why full_read? safe_read maybe? */
- while ((count = full_read(f, iobuf, MAX_MEMORY_BUF)) > 0) {
+ while ((count = safe_read(f, iobuf, MAX_MEMORY_BUF)) > 0) {
ssize_t n = count;
count = full_write(fd, iobuf, count);
if (count != n)
@@ -1382,8 +1393,8 @@ static void send_file_and_exit(const char *url)
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
fin:
#endif
- if (count < 0)
- bb_perror_msg("error:%u", errno);
+ if (count < 0 && verbose > 1)
+ bb_perror_msg("error");
_exit(0);
}
@@ -1487,10 +1498,10 @@ static int checkPerm(const char *path, const char *request)
}
if (strcmp(p, request) == 0) {
-set_remoteuser_var:
+ set_remoteuser_var:
remoteuser = strdup(request);
if (remoteuser)
- remoteuser[(u - request)] = 0;
+ remoteuser[(u - request)] = '\0';
return 1; /* Ok */
}
/* unauthorized */
@@ -1505,10 +1516,10 @@ set_remoteuser_var:
/*
* Handle timeouts
*/
-static void handle_sigalrm(int sig)
+static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
+static void exit_on_signal(int sig)
{
- sendHeaders(HTTP_REQUEST_TIMEOUT);
- alarm_signaled = 1;
+ send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
}
/*
@@ -1519,6 +1530,7 @@ static void handle_incoming_and_exit(void)
{
char *url;
char *purl;
+ int count;
int blank = -1;
char *test;
struct stat sb;
@@ -1535,7 +1547,7 @@ static void handle_incoming_and_exit(void)
int credentials = -1; /* if not required this is Ok */
#endif
- sa.sa_handler = handle_sigalrm;
+ sa.sa_handler = exit_on_signal;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0; /* no SA_RESTART */
sigaction(SIGALRM, &sa, NULL);
@@ -1543,31 +1555,25 @@ static void handle_incoming_and_exit(void)
/* It's not a real loop (it ends with while(0)).
* Break from this "loop" jumps to exit(0) */
do {
- int count;
-
alarm(TIMEOUT);
if (!get_line())
- break; /* EOF or error or empty line */
+ _exit(0); /* EOF or error or empty line */
purl = strpbrk(iobuf, " \t");
if (purl == NULL) {
- BAD_REQUEST:
- sendHeaders(HTTP_BAD_REQUEST);
- break;
+ send_headers_and_exit(HTTP_BAD_REQUEST);
}
*purl = '\0';
#if ENABLE_FEATURE_HTTPD_CGI
if (strcasecmp(iobuf, prequest) != 0) {
prequest = "POST";
if (strcasecmp(iobuf, prequest) != 0) {
- sendHeaders(HTTP_NOT_IMPLEMENTED);
- break;
+ send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
}
}
#else
if (strcasecmp(iobuf, request_GET) != 0) {
- sendHeaders(HTTP_NOT_IMPLEMENTED);
- break;
+ send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
}
#endif
*purl = ' ';
@@ -1575,12 +1581,11 @@ static void handle_incoming_and_exit(void)
if (count < 1 || iobuf[0] != '/') {
/* Garbled request/URL */
- goto BAD_REQUEST;
+ send_headers_and_exit(HTTP_BAD_REQUEST);
}
url = alloca(strlen(iobuf) + sizeof("/index.html"));
if (url == NULL) {
- sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
- break;
+ send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
}
strcpy(url, iobuf);
/* extract url args if present */
@@ -1593,11 +1598,10 @@ static void handle_incoming_and_exit(void)
test = decodeString(url, 0);
if (test == NULL)
- goto BAD_REQUEST;
- if (test == url+1) {
+ send_headers_and_exit(HTTP_BAD_REQUEST);
+ if (test == url + 1) {
/* '/' or NUL is encoded */
- sendHeaders(HTTP_NOT_FOUND);
- break;
+ send_headers_and_exit(HTTP_NOT_FOUND);
}
/* algorithm stolen from libbb bb_simplify_path(),
@@ -1619,7 +1623,7 @@ static void handle_incoming_and_exit(void)
++test;
if (purl == url) {
/* protect root */
- goto BAD_REQUEST;
+ send_headers_and_exit(HTTP_BAD_REQUEST);
}
while (*--purl != '/') /* omit previous dir */;
continue;
@@ -1668,7 +1672,7 @@ static void handle_incoming_and_exit(void)
if (prequest != request_GET) {
test = iobuf + sizeof("Content-length:") - 1;
if (!test[0])
- goto bail_out;
+ _exit(0);
errno = 0;
/* not using strtoul: it ignores leading minus! */
length = strtol(test, &test, 10);
@@ -1676,7 +1680,7 @@ static void handle_incoming_and_exit(void)
/* so we check for negative or too large values in one go: */
/* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
if (test[0] || errno || length > INT_MAX)
- goto bail_out;
+ _exit(0);
}
} else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
@@ -1706,38 +1710,30 @@ static void handle_incoming_and_exit(void)
} /* while extra header reading */
}
alarm(0);
- if (alarm_signaled)
- break;
if (strcmp(bb_basename(url), httpd_conf) == 0 || ip_allowed == 0) {
/* protect listing [/path]/httpd_conf or IP deny */
-#if ENABLE_FEATURE_HTTPD_CGI
- FORBIDDEN: /* protect listing /cgi-bin */
-#endif
- sendHeaders(HTTP_FORBIDDEN);
- break;
+ send_headers_and_exit(HTTP_FORBIDDEN);
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (credentials <= 0 && checkPerm(url, ":") == 0) {
- sendHeaders(HTTP_UNAUTHORIZED);
- break;
+ send_headers_and_exit(HTTP_UNAUTHORIZED);
}
#endif
if (found_moved_temporarily) {
- sendHeaders(HTTP_MOVED_TEMPORARILY);
- /* clear unforked memory flag */
- found_moved_temporarily = NULL;
- break;
+ send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
}
test = url + 1; /* skip first '/' */
#if ENABLE_FEATURE_HTTPD_CGI
if (strncmp(test, "cgi-bin", 7) == 0) {
- if (test[7] == '/' && test[8] == '\0')
- goto FORBIDDEN; /* protect listing cgi-bin/ */
+ if (test[7] == '/' && test[8] == '\0') {
+ /* protect listing cgi-bin/ */
+ send_headers_and_exit(HTTP_FORBIDDEN);
+ }
send_cgi_and_exit(url, prequest, length, cookie, content_type);
}
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
@@ -1754,8 +1750,7 @@ static void handle_incoming_and_exit(void)
}
#endif
if (prequest != request_GET) {
- sendHeaders(HTTP_NOT_IMPLEMENTED);
- break;
+ send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
}
#endif /* FEATURE_HTTPD_CGI */
if (purl[-1] == '/')
@@ -1779,10 +1774,6 @@ static void handle_incoming_and_exit(void)
send_file_and_exit(test);
} while (0);
-#if ENABLE_FEATURE_HTTPD_CGI
- bail_out:
-#endif
-
_exit(0);
#if 0 /* Is this needed? Why? */
@@ -1826,55 +1817,31 @@ static void handle_incoming_and_exit(void)
static void mini_httpd(int server) ATTRIBUTE_NORETURN;
static void mini_httpd(int server)
{
-// TODO: use accept WITHOUT select, it will just block there
- fd_set readfd, portfd;
-
- FD_ZERO(&portfd);
- FD_SET(server, &portfd);
-
/* copy the ports we are watching to the readfd set */
while (1) {
- int s;
- union {
- struct sockaddr sa;
- struct sockaddr_in sin;
- USE_FEATURE_IPV6(struct sockaddr_in6 sin6;)
- } fromAddr;
-// TODO: this looks like lsa to me
- socklen_t fromAddrLen = sizeof(fromAddr);
-
- /* Now wait INDEFINITELY on the set of sockets */
- readfd = portfd;
- if (select(server + 1, &readfd, 0, 0, 0) <= 0)
+ int n;
+ len_and_sockaddr fromAddr;
+
+ /* Wait for connections... */
+ fromAddr.len = LSA_SIZEOF_SA;
+ n = accept(server, &fromAddr.sa, &fromAddr.len);
+
+ if (n < 0)
continue;
- if (!FD_ISSET(server, &readfd))
- continue;
- s = accept(server, &fromAddr.sa, &fromAddrLen);
- if (s < 0)
- continue;
- accepted_socket = s;
+ /* set the KEEPALIVE option to cull dead connections */
+ setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+ accepted_socket = n;
+
+ n = get_nport(&fromAddr.sa);
+ tcp_port = ntohs(n);
rmt_ip = 0;
- tcp_port = 0;
- if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
- free(rmt_ip_str);
- rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
- if (DEBUG)
- bb_error_msg("connection from '%s'", rmt_ip_str);
- }
if (fromAddr.sa.sa_family == AF_INET) {
rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
-// TODO: use get_nport?
- tcp_port = ntohs(fromAddr.sin.sin_port);
}
-#if ENABLE_FEATURE_IPV6
- if (fromAddr.sa.sa_family == AF_INET6) {
- //rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
- tcp_port = ntohs(fromAddr.sin6.sin6_port);
+ if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
+ free(rmt_ip_str);
+ rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddr.len);
}
-#endif
-
- /* set the KEEPALIVE option to cull dead connections */
- setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
if (fork() == 0) {
/* child */
@@ -1885,10 +1852,13 @@ static void mini_httpd(int server)
if (verbose) {
/* this trick makes -v logging much simpler */
applet_name = rmt_ip_str;
+ if (verbose > 2)
+ bb_error_msg("connected");
}
handle_incoming_and_exit();
}
- close(s);
+ /* parent, or fork failed */
+ close(accepted_socket);
} /* while (1) */
/* never reached */
}
@@ -1898,31 +1868,20 @@ static void mini_httpd(int server)
static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
static void mini_httpd_inetd(void)
{
- union {
- struct sockaddr sa;
- struct sockaddr_in sin;
- USE_FEATURE_IPV6(struct sockaddr_in6 sin6;)
- } fromAddr;
-// TODO: this looks like lsa to me
- socklen_t fromAddrLen = sizeof(fromAddr);
-
- getpeername(0, &fromAddr.sa, &fromAddrLen);
+ int n;
+ len_and_sockaddr fromAddr;
+
+ fromAddr.len = LSA_SIZEOF_SA;
+ getpeername(0, &fromAddr.sa, &fromAddr.len);
+ n = get_nport(&fromAddr.sa);
+ tcp_port = ntohs(n);
rmt_ip = 0;
- tcp_port = 0;
- if (verbose || ENABLE_FEATURE_HTTPD_CGI || DEBUG) {
- free(rmt_ip_str);
- rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
- }
if (fromAddr.sa.sa_family == AF_INET) {
rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
- tcp_port = ntohs(fromAddr.sin.sin_port);
}
-#if ENABLE_FEATURE_IPV6
- if (fromAddr.sa.sa_family == AF_INET6) {
- //rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
- tcp_port = ntohs(fromAddr.sin6.sin6_port);
+ if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
+ rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddr.len);
}
-#endif
handle_incoming_and_exit();
}
generated by cgit v1.1 at 2024-12-27 21:12:21 +0000