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Merge remote-tracking branch 'upstream/master'

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This commit is contained in:
Armin Friedl 2020-08-23 16:31:13 +02:00
commit 670d2ed65c
9 changed files with 475 additions and 386 deletions
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429
http.c
View file

@ -61,7 +61,7 @@ const char *res_field_str[] = {
enum status
http_send_header(int fd, const struct response *res)
{
char t[FIELD_MAX];
char t[FIELD_MAX], esc[PATH_MAX];
size_t i;
if (timestamp(t, sizeof(t), time(NULL))) {
@ -89,6 +89,18 @@ http_send_header(int fd, const struct response *res)
return S_REQUEST_TIMEOUT;
}
/* listing header */
if (res->type == RESTYPE_DIRLISTING) {
html_escape(res->uri, esc, sizeof(esc));
if (dprintf(fd,
"<!DOCTYPE html>\n<html>\n\t<head>"
"<title>Index of %s</title></head>\n"
"\t<body>\n\t\t<a href=\"..\">..</a>",
esc) < 0) {
return S_REQUEST_TIMEOUT;
}
}
return res->status;
}
@ -143,44 +155,52 @@ decode(const char src[PATH_MAX], char dest[PATH_MAX])
dest[i] = '\0';
}
int
http_get_request(int fd, struct request *req)
enum status
http_recv_header(int fd, char *h, size_t hsiz, size_t *off)
{
ssize_t r;
if (h == NULL || off == NULL || *off > hsiz) {
return S_INTERNAL_SERVER_ERROR;
}
while (1) {
if ((r = read(fd, h + *off, hsiz - *off)) <= 0) {
return S_REQUEST_TIMEOUT;
}
*off += r;
/* check if we are done (header terminated) */
if (*off >= 4 && !memcmp(h + *off - 4, "\r\n\r\n", 4)) {
break;
}
/* buffer is full or read over, but header is not terminated */
if (r == 0 || *off == hsiz) {
return S_REQUEST_TOO_LARGE;
}
}
/* header is complete, remove last \r\n and null-terminate */
h[*off - 2] = '\0';
/* set *off to 0 to indicate we are finished */
*off = 0;
return 0;
}
enum status
http_parse_header(const char *h, struct request *req)
{
struct in6_addr addr;
size_t hlen, i, mlen;
ssize_t off;
char h[HEADER_MAX], *p, *q;
size_t i, mlen;
const char *p, *q;
char *m, *n;
/* empty all fields */
memset(req, 0, sizeof(*req));
/*
* receive header
*/
for (hlen = 0; ;) {
if ((off = read(fd, h + hlen, sizeof(h) - hlen)) < 0) {
return http_send_status(fd, S_REQUEST_TIMEOUT);
} else if (off == 0) {
break;
}
hlen += off;
if (hlen >= 4 && !memcmp(h + hlen - 4, "\r\n\r\n", 4)) {
break;
}
if (hlen == sizeof(h)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
}
/* remove terminating empty line */
if (hlen < 2) {
return http_send_status(fd, S_BAD_REQUEST);
}
hlen -= 2;
/* null-terminate the header */
h[hlen] = '\0';
/*
* parse request line
*/
@ -194,12 +214,12 @@ http_get_request(int fd, struct request *req)
}
}
if (i == NUM_REQ_METHODS) {
return http_send_status(fd, S_METHOD_NOT_ALLOWED);
return S_METHOD_NOT_ALLOWED;
}
/* a single space must follow the method */
if (h[mlen] != ' ') {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
/* basis for next step */
@ -207,32 +227,32 @@ http_get_request(int fd, struct request *req)
/* TARGET */
if (!(q = strchr(p, ' '))) {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
*q = '\0';
if (q - p + 1 > PATH_MAX) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
return S_REQUEST_TOO_LARGE;
}
memcpy(req->target, p, q - p + 1);
decode(req->target, req->target);
memcpy(req->uri, p, q - p);
req->uri[q - p] = '\0';
decode(req->uri, req->uri);
/* basis for next step */
p = q + 1;
/* HTTP-VERSION */
if (strncmp(p, "HTTP/", sizeof("HTTP/") - 1)) {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
p += sizeof("HTTP/") - 1;
if (strncmp(p, "1.0", sizeof("1.0") - 1) &&
strncmp(p, "1.1", sizeof("1.1") - 1)) {
return http_send_status(fd, S_VERSION_NOT_SUPPORTED);
return S_VERSION_NOT_SUPPORTED;
}
p += sizeof("1.*") - 1;
/* check terminator */
if (strncmp(p, "\r\n", sizeof("\r\n") - 1)) {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
/* basis for next step */
@ -253,7 +273,7 @@ http_get_request(int fd, struct request *req)
if (i == NUM_REQ_FIELDS) {
/* unmatched field, skip this line */
if (!(q = strstr(p, "\r\n"))) {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
p = q + (sizeof("\r\n") - 1);
continue;
@ -263,7 +283,7 @@ http_get_request(int fd, struct request *req)
/* a single colon must follow the field name */
if (*p != ':') {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
/* skip whitespace */
@ -272,13 +292,13 @@ http_get_request(int fd, struct request *req)
/* extract field content */
if (!(q = strstr(p, "\r\n"))) {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
*q = '\0';
if (q - p + 1 > FIELD_MAX) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
return S_REQUEST_TOO_LARGE;
}
memcpy(req->field[i], p, q - p + 1);
memcpy(req->field[i], p, q - p);
req->field[i][q - p] = '\0';
/* go to next line */
p = q + (sizeof("\r\n") - 1);
@ -288,37 +308,37 @@ http_get_request(int fd, struct request *req)
* clean up host
*/
p = strrchr(req->field[REQ_HOST], ':');
q = strrchr(req->field[REQ_HOST], ']');
m = strrchr(req->field[REQ_HOST], ':');
n = strrchr(req->field[REQ_HOST], ']');
/* strip port suffix but don't interfere with IPv6 bracket notation
* as per RFC 2732 */
if (p && (!q || p > q)) {
if (m && (!n || m > n)) {
/* port suffix must not be empty */
if (*(p + 1) == '\0') {
return http_send_status(fd, S_BAD_REQUEST);
if (*(m + 1) == '\0') {
return S_BAD_REQUEST;
}
*p = '\0';
*m = '\0';
}
/* strip the brackets from the IPv6 notation and validate the address */
if (q) {
if (n) {
/* brackets must be on the outside */
if (req->field[REQ_HOST][0] != '[' || *(q + 1) != '\0') {
return http_send_status(fd, S_BAD_REQUEST);
if (req->field[REQ_HOST][0] != '[' || *(n + 1) != '\0') {
return S_BAD_REQUEST;
}
/* remove the right bracket */
*q = '\0';
p = req->field[REQ_HOST] + 1;
*n = '\0';
m = req->field[REQ_HOST] + 1;
/* validate the contained IPv6 address */
if (inet_pton(AF_INET6, p, &addr) != 1) {
return http_send_status(fd, S_BAD_REQUEST);
if (inet_pton(AF_INET6, m, &addr) != 1) {
return S_BAD_REQUEST;
}
/* copy it into the host field */
memmove(req->field[REQ_HOST], p, q - p + 1);
memmove(req->field[REQ_HOST], m, n - m + 1);
}
return 0;
@ -528,171 +548,196 @@ parse_range(const char *str, size_t size, size_t *lower, size_t *upper)
#define RELPATH(x) ((!*(x) || !strcmp(x, "/")) ? "." : ((x) + 1))
enum status
http_send_response(int fd, const struct request *req)
http_prepare_response(const struct request *req, struct response *res,
const struct server *srv)
{
enum status returnstatus;
struct in6_addr addr;
struct response res = { 0 };
struct stat st;
struct tm tm = { 0 };
struct vhost *vhost;
size_t len, i;
size_t lower, upper;
int hasport, ipv6host;
static char realtarget[PATH_MAX], tmptarget[PATH_MAX];
static char realuri[PATH_MAX], tmpuri[PATH_MAX];
char *p, *mime;
const char *vhostmatch, *targethost;
const char *targethost;
/* make a working copy of the target */
memcpy(realtarget, req->target, sizeof(realtarget));
/* empty all response fields */
memset(res, 0, sizeof(*res));
/* make a working copy of the URI and normalize it */
memcpy(realuri, req->uri, sizeof(realuri));
if (normabspath(realuri)) {
return S_BAD_REQUEST;
}
/* match vhost */
vhostmatch = NULL;
if (s.vhost) {
for (i = 0; i < s.vhost_len; i++) {
/* switch to vhost directory if there is a match */
if (!regexec(&s.vhost[i].re, req->field[REQ_HOST], 0,
NULL, 0)) {
if (chdir(s.vhost[i].dir) < 0) {
return http_send_status(fd, (errno == EACCES) ?
S_FORBIDDEN : S_NOT_FOUND);
}
vhostmatch = s.vhost[i].chost;
vhost = NULL;
if (srv->vhost) {
for (i = 0; i < srv->vhost_len; i++) {
if (!regexec(&(srv->vhost[i].re), req->field[REQ_HOST],
0, NULL, 0)) {
/* we have a matching vhost */
vhost = &(srv->vhost[i]);
break;
}
}
if (i == s.vhost_len) {
return http_send_status(fd, S_NOT_FOUND);
if (i == srv->vhost_len) {
return S_NOT_FOUND;
}
/* if we have a vhost prefix, prepend it to the target */
if (s.vhost[i].prefix) {
if (esnprintf(tmptarget, sizeof(tmptarget), "%s%s",
s.vhost[i].prefix, realtarget)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
}
memcpy(realtarget, tmptarget, sizeof(realtarget));
/* if we have a vhost prefix, prepend it to the URI */
if (vhost->prefix &&
prepend(realuri, LEN(realuri), vhost->prefix)) {
return S_REQUEST_TOO_LARGE;
}
}
/* apply target prefix mapping */
for (i = 0; i < s.map_len; i++) {
len = strlen(s.map[i].from);
if (!strncmp(realtarget, s.map[i].from, len)) {
/* apply URI prefix mapping */
for (i = 0; i < srv->map_len; i++) {
len = strlen(srv->map[i].from);
if (!strncmp(realuri, srv->map[i].from, len)) {
/* match canonical host if vhosts are enabled and
* the mapping specifies a canonical host */
if (s.vhost && s.map[i].chost &&
strcmp(s.map[i].chost, vhostmatch)) {
if (srv->vhost && srv->map[i].chost &&
strcmp(srv->map[i].chost, vhost->chost)) {
continue;
}
/* swap out target prefix */
if (esnprintf(tmptarget, sizeof(tmptarget), "%s%s",
s.map[i].to, realtarget + len)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
/* swap out URI prefix */
memmove(realuri, realuri + len, strlen(realuri) + 1);
if (prepend(realuri, LEN(realuri), srv->map[i].to)) {
return S_REQUEST_TOO_LARGE;
}
memcpy(realtarget, tmptarget, sizeof(realtarget));
break;
}
}
/* normalize target */
if (normabspath(realtarget)) {
return http_send_status(fd, S_BAD_REQUEST);
/* normalize URI again, in case we introduced dirt */
if (normabspath(realuri)) {
return S_BAD_REQUEST;
}
/* reject hidden target */
if (realtarget[0] == '.' || strstr(realtarget, "/.")) {
return http_send_status(fd, S_FORBIDDEN);
}
/* stat the target */
if (stat(RELPATH(realtarget), &st) < 0) {
return http_send_status(fd, (errno == EACCES) ?
S_FORBIDDEN : S_NOT_FOUND);
/* stat the relative path derived from the URI */
if (stat(RELPATH(realuri), &st) < 0) {
return (errno == EACCES) ? S_FORBIDDEN : S_NOT_FOUND;
}
if (S_ISDIR(st.st_mode)) {
/* add / to target if not present */
len = strlen(realtarget);
if (len >= PATH_MAX - 2) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
/* append '/' to URI if not present */
len = strlen(realuri);
if (len + 1 + 1 > PATH_MAX) {
return S_REQUEST_TOO_LARGE;
}
if (len && realtarget[len - 1] != '/') {
realtarget[len] = '/';
realtarget[len + 1] = '\0';
if (len > 0 && realuri[len - 1] != '/') {
realuri[len] = '/';
realuri[len + 1] = '\0';
}
}
/* redirect if targets differ, host is non-canonical or we prefixed */
if (strcmp(req->target, realtarget) || (s.vhost && vhostmatch &&
strcmp(req->field[REQ_HOST], vhostmatch))) {
res.status = S_MOVED_PERMANENTLY;
/*
* reject hidden targets, except if it is a well-known URI
* according to RFC 8615
*/
if (strstr(realuri, "/.") && strncmp(realuri,
"/.well-known/", sizeof("/.well-known/") - 1)) {
return S_FORBIDDEN;
}
/* encode realtarget */
encode(realtarget, tmptarget);
/*
* redirect if the original URI and the "real" URI differ or if
* the requested host is non-canonical
*/
if (strcmp(req->uri, realuri) || (srv->vhost && vhost &&
strcmp(req->field[REQ_HOST], vhost->chost))) {
res->status = S_MOVED_PERMANENTLY;
/* encode realuri */
encode(realuri, tmpuri);
/* determine target location */
if (s.vhost) {
if (srv->vhost) {
/* absolute redirection URL */
targethost = req->field[REQ_HOST][0] ? vhostmatch ?
vhostmatch : req->field[REQ_HOST] : s.host ?
s.host : "localhost";
targethost = req->field[REQ_HOST][0] ? vhost->chost ?
vhost->chost : req->field[REQ_HOST] :
srv->host ? srv->host : "localhost";
/* do we need to add a port to the Location? */
hasport = s.port && strcmp(s.port, "80");
hasport = srv->port && strcmp(srv->port, "80");
/* RFC 2732 specifies to use brackets for IPv6-addresses
* in URLs, so we need to check if our host is one and
* honor that later when we fill the "Location"-field */
if ((ipv6host = inet_pton(AF_INET6, targethost,
&addr)) < 0) {
return http_send_status(fd,
S_INTERNAL_SERVER_ERROR);
return S_INTERNAL_SERVER_ERROR;
}
/* write location to response struct */
if (esnprintf(res.field[RES_LOCATION],
sizeof(res.field[RES_LOCATION]),
if (esnprintf(res->field[RES_LOCATION],
sizeof(res->field[RES_LOCATION]),
"//%s%s%s%s%s%s",
ipv6host ? "[" : "",
targethost,
ipv6host ? "]" : "", hasport ? ":" : "",
hasport ? s.port : "", tmptarget)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
hasport ? srv->port : "", tmpuri)) {
return S_REQUEST_TOO_LARGE;
}
} else {
/* write relative redirection URL to response struct */
if (esnprintf(res.field[RES_LOCATION],
sizeof(res.field[RES_LOCATION]),
tmptarget)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
/* write relative redirection URI to response struct */
if (esnprintf(res->field[RES_LOCATION],
sizeof(res->field[RES_LOCATION]),
"%s", tmpuri)) {
return S_REQUEST_TOO_LARGE;
}
}
return http_send_header(fd, &res);
return 0;
} else {
/*
* the URI is well-formed, we can now write the URI into
* the response-URI and corresponding relative path
* (optionally including the vhost servedir as a prefix)
* into the actual response-path
*/
if (esnprintf(res->uri, sizeof(res->uri), "%s", req->uri)) {
return S_REQUEST_TOO_LARGE;
}
if (esnprintf(res->path, sizeof(res->path), "%s%s",
vhost ? vhost->dir : "", RELPATH(req->uri))) {
return S_REQUEST_TOO_LARGE;
}
}
if (S_ISDIR(st.st_mode)) {
/* append docindex to target */
if (esnprintf(realtarget, sizeof(realtarget), "%s%s",
req->target, s.docindex)) {
return http_send_status(fd, S_REQUEST_TOO_LARGE);
/*
* check if the directory index exists by appending it to
* the URI
*/
if (esnprintf(tmpuri, sizeof(tmpuri), "%s%s",
req->uri, srv->docindex)) {
return S_REQUEST_TOO_LARGE;
}
/* stat the docindex, which must be a regular file */
if (stat(RELPATH(realtarget), &st) < 0 || !S_ISREG(st.st_mode)) {
if (s.listdirs) {
/* remove index suffix and serve dir */
realtarget[strlen(realtarget) -
strlen(s.docindex)] = '\0';
return resp_dir(fd, RELPATH(realtarget), req);
if (stat(RELPATH(tmpuri), &st) < 0 || !S_ISREG(st.st_mode)) {
if (srv->listdirs) {
/* serve directory listing */
res->type = RESTYPE_DIRLISTING;
res->status = (access(res->path, R_OK)) ?
S_FORBIDDEN : S_OK;
if (esnprintf(res->field[RES_CONTENT_TYPE],
sizeof(res->field[RES_CONTENT_TYPE]),
"%s", "text/html; charset=utf-8")) {
return S_INTERNAL_SERVER_ERROR;
}
return 0;
} else {
/* reject */
if (!S_ISREG(st.st_mode) || errno == EACCES) {
return http_send_status(fd, S_FORBIDDEN);
} else {
return http_send_status(fd, S_NOT_FOUND);
}
return (!S_ISREG(st.st_mode) || errno == EACCES) ?
S_FORBIDDEN : S_NOT_FOUND;
}
}
}
@ -702,39 +747,39 @@ http_send_response(int fd, const struct request *req)
/* parse field */
if (!strptime(req->field[REQ_IF_MODIFIED_SINCE],
"%a, %d %b %Y %T GMT", &tm)) {
return http_send_status(fd, S_BAD_REQUEST);
return S_BAD_REQUEST;
}
/* compare with last modification date of the file */
if (difftime(st.st_mtim.tv_sec, timegm(&tm)) <= 0) {
res.status = S_NOT_MODIFIED;
return http_send_header(fd, &res);
res->status = S_NOT_MODIFIED;
return 0;
}
}
/* range */
if ((returnstatus = parse_range(req->field[REQ_RANGE],
st.st_size, &lower, &upper))) {
if ((returnstatus = parse_range(req->field[REQ_RANGE], st.st_size,
&(res->file.lower),
&(res->file.upper)))) {
if (returnstatus == S_RANGE_NOT_SATISFIABLE) {
res.status = S_RANGE_NOT_SATISFIABLE;
res->status = S_RANGE_NOT_SATISFIABLE;
if (esnprintf(res.field[RES_CONTENT_RANGE],
sizeof(res.field[RES_CONTENT_RANGE]),
if (esnprintf(res->field[RES_CONTENT_RANGE],
sizeof(res->field[RES_CONTENT_RANGE]),
"bytes */%zu", st.st_size)) {
return http_send_status(fd,
S_INTERNAL_SERVER_ERROR);
return S_INTERNAL_SERVER_ERROR;
}
return http_send_header(fd, &res);
return 0;
} else {
return http_send_status(fd, returnstatus);
return returnstatus;
}
}
/* mime */
mime = "application/octet-stream";
if ((p = strrchr(realtarget, '.'))) {
for (i = 0; i < sizeof(mimes) / sizeof(*mimes); i++) {
if ((p = strrchr(realuri, '.'))) {
for (i = 0; i < LEN(mimes); i++) {
if (!strcmp(mimes[i].ext, p + 1)) {
mime = mimes[i].type;
break;
@ -742,5 +787,43 @@ http_send_response(int fd, const struct request *req)
}
}
return resp_file(fd, RELPATH(realtarget), req, &st, mime, lower, upper);
/* fill response struct */
res->type = RESTYPE_FILE;
/* check if file is readable */
res->status = (access(res->path, R_OK)) ? S_FORBIDDEN :
(req->field[REQ_RANGE][0] != '\0') ?
S_PARTIAL_CONTENT : S_OK;
if (esnprintf(res->field[RES_ACCEPT_RANGES],
sizeof(res->field[RES_ACCEPT_RANGES]),
"%s", "bytes")) {
return S_INTERNAL_SERVER_ERROR;
}
if (esnprintf(res->field[RES_CONTENT_LENGTH],
sizeof(res->field[RES_CONTENT_LENGTH]),
"%zu", res->file.upper - res->file.lower + 1)) {
return S_INTERNAL_SERVER_ERROR;
}
if (req->field[REQ_RANGE][0] != '\0') {
if (esnprintf(res->field[RES_CONTENT_RANGE],
sizeof(res->field[RES_CONTENT_RANGE]),
"bytes %zd-%zd/%zu", res->file.lower,
res->file.upper, st.st_size)) {
return S_INTERNAL_SERVER_ERROR;
}
}
if (esnprintf(res->field[RES_CONTENT_TYPE],
sizeof(res->field[RES_CONTENT_TYPE]),
"%s", mime)) {
return S_INTERNAL_SERVER_ERROR;
}
if (timestamp(res->field[RES_LAST_MODIFIED],
sizeof(res->field[RES_LAST_MODIFIED]),
st.st_mtim.tv_sec)) {
return S_INTERNAL_SERVER_ERROR;
}
return 0;
}

41
http.h
View file

@ -4,6 +4,8 @@
#include <limits.h>
#include "util.h"
#define HEADER_MAX 4096
#define FIELD_MAX 200
@ -26,7 +28,7 @@ extern const char *req_method_str[];
struct request {
enum req_method method;
char target[PATH_MAX];
char uri[PATH_MAX];
char field[NUM_REQ_FIELDS][FIELD_MAX];
};
@ -61,14 +63,47 @@ enum res_field {
extern const char *res_field_str[];
enum res_type {
RESTYPE_ERROR,
RESTYPE_FILE,
RESTYPE_DIRLISTING,
NUM_RES_TYPES,
};
struct response {
enum res_type type;
enum status status;
char field[NUM_RES_FIELDS][FIELD_MAX];
char uri[PATH_MAX];
char path[PATH_MAX];
struct {
size_t lower;
size_t upper;
} file;
};
enum conn_state {
C_VACANT,
C_RECV_HEADER,
C_SEND_HEADER,
C_SEND_DATA,
NUM_CONN_STATES,
};
struct connection {
enum conn_state state;
int fd;
char header[HEADER_MAX]; /* general req/res-header buffer */
size_t off; /* general offset (header/file/dir) */
struct request req;
struct response res;
};
enum status http_send_header(int, const struct response *);
enum status http_send_status(int, enum status);
int http_get_request(int, struct request *);
enum status http_send_response(int, const struct request *);
enum status http_recv_header(int, char *, size_t, size_t *);
enum status http_parse_header(const char *, struct request *);
enum status http_prepare_response(const struct request *, struct response *,
const struct server *);
#endif /* HTTP_H */

82
main.c
View file

@ -16,6 +16,7 @@
#include <time.h>
#include <unistd.h>
#include "resp.h"
#include "http.h"
#include "sock.h"
#include "util.h"
@ -23,22 +24,33 @@
static char *udsname;
static void
serve(int infd, const struct sockaddr_storage *in_sa)
serve(int infd, const struct sockaddr_storage *in_sa, const struct server *srv)
{
struct request req;
struct connection c = { .fd = infd };
time_t t;
enum status status;
char inaddr[INET6_ADDRSTRLEN /* > INET_ADDRSTRLEN */];
char tstmp[21];
/* set connection timeout */
if (sock_set_timeout(infd, 30)) {
if (sock_set_timeout(c.fd, 30)) {
goto cleanup;
}
/* handle request */
if (!(status = http_get_request(infd, &req))) {
status = http_send_response(infd, &req);
if ((status = http_recv_header(c.fd, c.header, LEN(c.header), &c.off)) ||
(status = http_parse_header(c.header, &c.req)) ||
(status = http_prepare_response(&c.req, &c.res, srv))) {
status = http_send_status(c.fd, status);
} else {
status = http_send_header(c.fd, &c.res);
/* send data */
if (c.res.type == RESTYPE_FILE) {
resp_file(c.fd, &c.res);
} else if (c.res.type == RESTYPE_DIRLISTING) {
resp_dir(c.fd, &c.res);
}
}
/* write output to log */
@ -52,12 +64,12 @@ serve(int infd, const struct sockaddr_storage *in_sa)
goto cleanup;
}
printf("%s\t%s\t%d\t%s\t%s\n", tstmp, inaddr, status,
req.field[REQ_HOST], req.target);
c.req.field[REQ_HOST], c.req.uri);
cleanup:
/* clean up and finish */
shutdown(infd, SHUT_RD);
shutdown(infd, SHUT_WR);
close(infd);
shutdown(c.fd, SHUT_RD);
shutdown(c.fd, SHUT_WR);
close(c.fd);
}
static void
@ -177,6 +189,9 @@ main(int argc, char *argv[])
struct group *grp = NULL;
struct passwd *pwd = NULL;
struct rlimit rlim;
struct server srv = {
.docindex = "index.html",
};
struct sockaddr_storage in_sa;
size_t i;
socklen_t in_sa_len;
@ -190,13 +205,6 @@ main(int argc, char *argv[])
char *user = "nobody";
char *group = "nogroup";
s.host = s.port = NULL;
s.vhost = NULL;
s.map = NULL;
s.vhost_len = s.map_len = 0;
s.docindex = "index.html";
s.listdirs = 0;
ARGBEGIN {
case 'd':
servedir = EARGF(usage());
@ -205,28 +213,28 @@ main(int argc, char *argv[])
group = EARGF(usage());
break;
case 'h':
s.host = EARGF(usage());
srv.host = EARGF(usage());
break;
case 'i':
s.docindex = EARGF(usage());
if (strchr(s.docindex, '/')) {
srv.docindex = EARGF(usage());
if (strchr(srv.docindex, '/')) {
die("The document index must not contain '/'");
}
break;
case 'l':
s.listdirs = 1;
srv.listdirs = 1;
break;
case 'm':
if (spacetok(EARGF(usage()), tok, 3) || !tok[0] || !tok[1]) {
usage();
}
if (!(s.map = reallocarray(s.map, ++s.map_len,
if (!(srv.map = reallocarray(srv.map, ++srv.map_len,
sizeof(struct map)))) {
die("reallocarray:");
}
s.map[s.map_len - 1].from = tok[0];
s.map[s.map_len - 1].to = tok[1];
s.map[s.map_len - 1].chost = tok[2];
srv.map[srv.map_len - 1].from = tok[0];
srv.map[srv.map_len - 1].to = tok[1];
srv.map[srv.map_len - 1].chost = tok[2];
break;
case 'n':
maxnprocs = strtonum(EARGF(usage()), 1, INT_MAX, &err);
@ -235,7 +243,7 @@ main(int argc, char *argv[])
}
break;
case 'p':
s.port = EARGF(usage());
srv.port = EARGF(usage());
break;
case 'U':
udsname = EARGF(usage());
@ -248,14 +256,14 @@ main(int argc, char *argv[])
!tok[2]) {
usage();
}
if (!(s.vhost = reallocarray(s.vhost, ++s.vhost_len,
sizeof(struct vhost)))) {
if (!(srv.vhost = reallocarray(srv.vhost, ++srv.vhost_len,
sizeof(*srv.vhost)))) {
die("reallocarray:");
}
s.vhost[s.vhost_len - 1].chost = tok[0];
s.vhost[s.vhost_len - 1].regex = tok[1];
s.vhost[s.vhost_len - 1].dir = tok[2];
s.vhost[s.vhost_len - 1].prefix = tok[3];
srv.vhost[srv.vhost_len - 1].chost = tok[0];
srv.vhost[srv.vhost_len - 1].regex = tok[1];
srv.vhost[srv.vhost_len - 1].dir = tok[2];
srv.vhost[srv.vhost_len - 1].prefix = tok[3];
break;
default:
usage();
@ -266,7 +274,7 @@ main(int argc, char *argv[])
}
/* can't have both host and UDS but must have one of port or UDS*/
if ((s.host && udsname) || !(s.port || udsname)) {
if ((srv.host && udsname) || !(srv.port || udsname)) {
usage();
}
@ -276,11 +284,11 @@ main(int argc, char *argv[])
}
/* compile and check the supplied vhost regexes */
for (i = 0; i < s.vhost_len; i++) {
if (regcomp(&s.vhost[i].re, s.vhost[i].regex,
for (i = 0; i < srv.vhost_len; i++) {
if (regcomp(&srv.vhost[i].re, srv.vhost[i].regex,
REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
die("regcomp '%s': invalid regex",
s.vhost[i].regex);
srv.vhost[i].regex);
}
}
@ -309,7 +317,7 @@ main(int argc, char *argv[])
/* bind socket */
insock = udsname ? sock_get_uds(udsname, pwd->pw_uid, grp->gr_gid) :
sock_get_ips(s.host, s.port);
sock_get_ips(srv.host, srv.port);
switch (fork()) {
case -1:
@ -372,7 +380,7 @@ main(int argc, char *argv[])
/* fork and handle */
switch (fork()) {
case 0:
serve(infd, &in_sa);
serve(infd, &in_sa, &srv);
exit(0);
break;
case -1:

18
quark.1
View file

@ -1,4 +1,4 @@
.Dd 2019-02-24
.Dd 2020-08-23
.Dt QUARK 1
.Os suckless.org
.Sh NAME
@ -30,6 +30,15 @@
.Sh DESCRIPTION
.Nm
is a simple HTTP GET/HEAD-only web server for static content.
It supports virtual hosts (see
.Fl v ) ,
explicit redirects (see
.Fl m ) ,
directory listings (see
.Fl l ) ,
conditional "If-Modified-Since"-requests (RFC 7232), range requests
(RFC 7233) and well-known URIs (RFC 8615), while refusing to serve
hidden files and directories.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl d Ar dir
@ -46,6 +55,7 @@ The default is "nogroup".
Use
.Ar host
as the server hostname.
The default is the loopback interface (i.e. localhost).
.It Fl i Ar file
Set
.Ar file
@ -54,7 +64,7 @@ The default is "index.html".
.It Fl l
Enable directory listing.
.It Fl m Ar map
Add the target prefix mapping rule specified by
Add the URI prefix mapping rule specified by
.Ar map ,
which has the form
.Qq Pa from to [chost] ,
@ -63,7 +73,7 @@ escaped with '\\'.
.Pp
The prefix
.Pa from
of all matching targets is replaced with
of all matching URIs is replaced with
.Pa to ,
optionally limited to the canonical virtual host
.Pa chost .
@ -108,7 +118,7 @@ is redirected to the canonical host
.Pa chost ,
if they differ, using the directory
.Pa dir
as the root directory, optionally prefixing the target with
as the root directory, optionally prefixing the URI with
.Pa prefix .
If any virtual hosts are specified, all requests on non-matching
hosts are discarded.

208
resp.c
View file

@ -38,202 +38,94 @@ suffix(int t)
return "";
}
static void
html_escape(const char *src, char *dst, size_t dst_siz)
{
const struct {
char c;
char *s;
} escape[] = {
{ '&', "&amp;" },
{ '<', "&lt;" },
{ '>', "&gt;" },
{ '"', "&quot;" },
{ '\'', "&#x27;" },
};
size_t i, j, k, esclen;
for (i = 0, j = 0; src[i] != '\0'; i++) {
for (k = 0; k < LEN(escape); k++) {
if (src[i] == escape[k].c) {
break;
}
}
if (k == LEN(escape)) {
/* no escape char at src[i] */
if (j == dst_siz - 1) {
/* silent truncation */
break;
} else {
dst[j++] = src[i];
}
} else {
/* escape char at src[i] */
esclen = strlen(escape[k].s);
if (j >= dst_siz - esclen) {
/* silent truncation */
break;
} else {
memcpy(&dst[j], escape[k].s, esclen);
j += esclen;
}
}
}
dst[j] = '\0';
}
enum status
resp_dir(int fd, const char *name, const struct request *req)
resp_dir(int fd, const struct response *res)
{
enum status sendstatus;
enum status ret;
struct dirent **e;
struct response res = {
.status = S_OK,
.field[RES_CONTENT_TYPE] = "text/html; charset=utf-8",
};
size_t i;
int dirlen;
char esc[PATH_MAX /* > NAME_MAX */ * 6]; /* strlen("&...;") <= 6 */
/* read directory */
if ((dirlen = scandir(name, &e, NULL, compareent)) < 0) {
return http_send_status(fd, S_FORBIDDEN);
if ((dirlen = scandir(res->path, &e, NULL, compareent)) < 0) {
return S_FORBIDDEN;
}
/* send header as late as possible */
if ((sendstatus = http_send_header(fd, &res)) != res.status) {
res.status = sendstatus;
/* listing */
for (i = 0; i < (size_t)dirlen; i++) {
/* skip hidden files, "." and ".." */
if (e[i]->d_name[0] == '.') {
continue;
}
/* entry line */
html_escape(e[i]->d_name, esc, sizeof(esc));
if (dprintf(fd, "<br />\n\t\t<a href=\"%s%s\">%s%s</a>",
esc,
(e[i]->d_type == DT_DIR) ? "/" : "",
esc,
suffix(e[i]->d_type)) < 0) {
ret = S_REQUEST_TIMEOUT;
goto cleanup;
}
}
/* listing footer */
if (dprintf(fd, "\n\t</body>\n</html>\n") < 0) {
ret = S_REQUEST_TIMEOUT;
goto cleanup;
}
if (req->method == M_GET) {
/* listing header */
html_escape(name, esc, sizeof(esc));
if (dprintf(fd,
"<!DOCTYPE html>\n<html>\n\t<head>"
"<title>Index of %s</title></head>\n"
"\t<body>\n\t\t<a href=\"..\">..</a>",
esc) < 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
/* listing */
for (i = 0; i < (size_t)dirlen; i++) {
/* skip hidden files, "." and ".." */
if (e[i]->d_name[0] == '.') {
continue;
}
/* entry line */
html_escape(e[i]->d_name, esc, sizeof(esc));
if (dprintf(fd, "<br />\n\t\t<a href=\"%s%s\">%s%s</a>",
esc,
(e[i]->d_type == DT_DIR) ? "/" : "",
esc,
suffix(e[i]->d_type)) < 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
}
/* listing footer */
if (dprintf(fd, "\n\t</body>\n</html>\n") < 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
}
cleanup:
while (dirlen--) {
free(e[dirlen]);
}
free(e);
return res.status;
return ret;
}
enum status
resp_file(int fd, const char *name, const struct request *req,
const struct stat *st, const char *mime, size_t lower,
size_t upper)
resp_file(int fd, const struct response *res)
{
FILE *fp;
enum status sendstatus;
struct response res = {
.status = (req->field[REQ_RANGE][0] != '\0') ?
S_PARTIAL_CONTENT : S_OK,
.field[RES_ACCEPT_RANGES] = "bytes",
};
enum status ret = 0;
ssize_t bread, bwritten;
size_t remaining;
static char buf[BUFSIZ], *p;
/* open file */
if (!(fp = fopen(name, "r"))) {
res.status = http_send_status(fd, S_FORBIDDEN);
if (!(fp = fopen(res->path, "r"))) {
ret = S_FORBIDDEN;
goto cleanup;
}
/* seek to lower bound */
if (fseek(fp, lower, SEEK_SET)) {
res.status = http_send_status(fd, S_INTERNAL_SERVER_ERROR);
if (fseek(fp, res->file.lower, SEEK_SET)) {
ret = S_INTERNAL_SERVER_ERROR;
goto cleanup;
}
/* build header */
if (esnprintf(res.field[RES_CONTENT_LENGTH],
sizeof(res.field[RES_CONTENT_LENGTH]),
"%zu", upper - lower + 1)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
}
if (req->field[REQ_RANGE][0] != '\0') {
if (esnprintf(res.field[RES_CONTENT_RANGE],
sizeof(res.field[RES_CONTENT_RANGE]),
"bytes %zd-%zd/%zu", lower, upper,
st->st_size)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
/* write data until upper bound is hit */
remaining = res->file.upper - res->file.lower + 1;
while ((bread = fread(buf, 1, MIN(sizeof(buf),
remaining), fp))) {
if (bread < 0) {
ret = S_INTERNAL_SERVER_ERROR;
goto cleanup;
}
}
if (esnprintf(res.field[RES_CONTENT_TYPE],
sizeof(res.field[RES_CONTENT_TYPE]),
"%s", mime)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
}
if (timestamp(res.field[RES_LAST_MODIFIED],
sizeof(res.field[RES_LAST_MODIFIED]),
st->st_mtim.tv_sec)) {
return http_send_status(fd, S_INTERNAL_SERVER_ERROR);
}
/* send header as late as possible */
if ((sendstatus = http_send_header(fd, &res)) != res.status) {
res.status = sendstatus;
goto cleanup;
}
if (req->method == M_GET) {
/* write data until upper bound is hit */
remaining = upper - lower + 1;
while ((bread = fread(buf, 1, MIN(sizeof(buf),
remaining), fp))) {
if (bread < 0) {
res.status = S_INTERNAL_SERVER_ERROR;
remaining -= bread;
p = buf;
while (bread > 0) {
bwritten = write(fd, p, bread);
if (bwritten <= 0) {
ret = S_REQUEST_TIMEOUT;
goto cleanup;
}
remaining -= bread;
p = buf;
while (bread > 0) {
bwritten = write(fd, p, bread);
if (bwritten <= 0) {
res.status = S_REQUEST_TIMEOUT;
goto cleanup;
}
bread -= bwritten;
p += bwritten;
}
bread -= bwritten;
p += bwritten;
}
}
cleanup:
@ -241,5 +133,5 @@ cleanup:
fclose(fp);
}
return res.status;
return ret;
}

5
resp.h
View file

@ -7,8 +7,7 @@
#include "http.h"
enum status resp_dir(int, const char *, const struct request *);
enum status resp_file(int, const char *, const struct request *,
const struct stat *, const char *, size_t, size_t);
enum status resp_dir(int, const struct response *);
enum status resp_file(int, const struct response *);
#endif /* RESP_H */

11
sock.c
View file

@ -63,7 +63,7 @@ void
sock_rem_uds(const char *udsname)
{
if (unlink(udsname) < 0) {
die("unlink:");
die("unlink '%s':", udsname);
}
}
@ -74,7 +74,8 @@ sock_get_uds(const char *udsname, uid_t uid, gid_t gid)
.sun_family = AF_UNIX,
};
size_t udsnamelen;
int insock, sockmode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
int insock, sockmode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP |
S_IROTH | S_IWOTH;
if ((insock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
die("socket:");
@ -86,7 +87,7 @@ sock_get_uds(const char *udsname, uid_t uid, gid_t gid)
memcpy(addr.sun_path, udsname, udsnamelen + 1);
if (bind(insock, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
die("bind %s:", udsname);
die("bind '%s':", udsname);
}
if (listen(insock, SOMAXCONN) < 0) {
@ -96,12 +97,12 @@ sock_get_uds(const char *udsname, uid_t uid, gid_t gid)
if (chmod(udsname, sockmode) < 0) {
sock_rem_uds(udsname);
die("chmod:");
die("chmod '%s':", udsname);
}
if (chown(udsname, uid, gid) < 0) {
sock_rem_uds(udsname);
die("chown:");
die("chown '%s':", udsname);
}
return insock;

61
util.c
View file

@ -16,7 +16,6 @@
#include "util.h"
char *argv0;
struct server s;
static void
verr(const char *fmt, va_list ap)
@ -109,6 +108,66 @@ esnprintf(char *str, size_t size, const char *fmt, ...)
return (ret < 0 || (size_t)ret >= size);
}
int
prepend(char *str, size_t size, const char *prefix)
{
size_t len = strlen(str), prefixlen = strlen(prefix);
if (len + prefixlen + 1 > size) {
return 1;
}
memmove(str + prefixlen, str, len + 1);
memcpy(str, prefix, prefixlen);
return 0;
}
void
html_escape(const char *src, char *dst, size_t dst_siz)
{
const struct {
char c;
char *s;
} escape[] = {
{ '&', "&amp;" },
{ '<', "&lt;" },
{ '>', "&gt;" },
{ '"', "&quot;" },
{ '\'', "&#x27;" },
};
size_t i, j, k, esclen;
for (i = 0, j = 0; src[i] != '\0'; i++) {
for (k = 0; k < LEN(escape); k++) {
if (src[i] == escape[k].c) {
break;
}
}
if (k == LEN(escape)) {
/* no escape char at src[i] */
if (j == dst_siz - 1) {
/* silent truncation */
break;
} else {
dst[j++] = src[i];
}
} else {
/* escape char at src[i] */
esclen = strlen(escape[k].s);
if (j >= dst_siz - esclen) {
/* silent truncation */
break;
} else {
memcpy(&dst[j], escape[k].s, esclen);
j += esclen;
}
}
}
dst[j] = '\0';
}
#define INVALID 1
#define TOOSMALL 2
#define TOOLARGE 3

6
util.h
View file

@ -23,7 +23,7 @@ struct map {
char *to;
};
extern struct server {
struct server {
char *host;
char *port;
char *docindex;
@ -32,7 +32,7 @@ extern struct server {
size_t vhost_len;
struct map *map;
size_t map_len;
} s;
};
#undef MIN
#define MIN(x,y) ((x) < (y) ? (x) : (y))
@ -51,6 +51,8 @@ void eunveil(const char *, const char *);
int timestamp(char *, size_t, time_t);
int esnprintf(char *, size_t, const char *, ...);
int prepend(char *, size_t, const char *);
void html_escape(const char *, char *, size_t);
void *reallocarray(void *, size_t, size_t);
long long strtonum(const char *, long long, long long, const char **);