Refactor response-constructors
Instead of providing a function for each entry-type, use a small static lookup-table and one function to rule them all. In the future, in case the list grows, we might think about implementing it with a small hash-lookup, but currently, it's easy enough synchronizing the enum and the array. While at it, improve the logic in the code itself by using logical OR's instead of AND's.
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FRIGN
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6d5bedd72a
commit
e9408312e1
1 changed files with 41 additions and 87 deletions
128
quark.c
128
quark.c
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@ -46,12 +46,28 @@ static const char HttpUnauthorized[] = "401 Unauthorized";
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static const char HttpNotFound[] = "404 Not Found";
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static const char texthtml[] = "text/html";
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enum {
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HEADER,
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CONTENTLEN,
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LOCATION,
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CONTENTTYPE,
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MODIFIED
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};
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static const char *resentry[] = {
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"HTTP/1.1 %s\r\nConnection: close\r\nDate: %s\r\nServer: quark-"VERSION"\r\n",
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"Content-Length: %lu\r\n",
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"Location: %s%s\r\n",
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"Content-Type: %s\r\n",
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"Last-Modified: %s\r\n" };
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static ssize_t writetext(const char *buf);
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static ssize_t writedata(const char *buf, size_t buflen);
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static void atomiclog(int fd, const char *errstr, va_list ap);
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static void die(const char *errstr, ...);
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static void logmsg(const char *errstr, ...);
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static void logerrmsg(const char *errstr, ...);
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static void die(const char *errstr, ...);
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static int putresentry(int type, ...);
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static void response(void);
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static void responsecgi(void);
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static void responsedir(void);
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@ -140,68 +156,18 @@ die(const char *errstr, ...) {
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}
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int
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responsehdr(const char *status) {
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if(snprintf(resbuf, MAXBUFLEN,
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"HTTP/1.1 %s\r\n"
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"Connection: close\r\n"
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"Date: %s\r\n"
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"Server: quark-"VERSION"\r\n",
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status, tstamp()) >= MAXBUFLEN)
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{
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logerrmsg("snprintf failed, buffer size exceeded");
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putresentry(int type, ...) {
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va_list ap;
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va_start(ap, type);
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if(vsnprintf(resbuf, MAXBUFLEN, resentry[type], ap) >= MAXBUFLEN) {
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logerrmsg("vsnprintf failed, buffer size exceeded");
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return -1;
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}
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va_end(ap);
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return writetext(resbuf);
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}
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int
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responsecontentlen(off_t size) {
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if(snprintf(resbuf, MAXBUFLEN,
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"Content-Length: %lu\r\n",
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size) >= MAXBUFLEN)
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{
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logerrmsg("snprintf failed, buffer sizeof exceeded");
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return -1;
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}
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return writetext(resbuf);
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}
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int
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responselocation(const char *location, const char *pathinfo) {
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if(snprintf(resbuf, MAXBUFLEN,
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"Location: %s%s\r\n",
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location, pathinfo) >= MAXBUFLEN)
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{
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logerrmsg("snprintf failed, buffer sizeof exceeded");
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return -1;
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}
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return writetext(resbuf);
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}
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int
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responsecontenttype(const char *mimetype) {
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if(snprintf(resbuf, MAXBUFLEN,
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"Content-Type: %s\r\n",
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mimetype) >= MAXBUFLEN)
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{
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logerrmsg("snprintf failed, buffer sizeof exceeded");
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return -1;
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}
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return writetext(resbuf);
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}
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int
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responsemodified(char *mod) {
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if(snprintf(resbuf, MAXBUFLEN,
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"Last-Modified: %s\r\n",
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mod) >= MAXBUFLEN)
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{
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logerrmsg("snprintf failed, buffer sizeof exceeded");
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return -1;
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}
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return writetext(resbuf);
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}
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void
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responsefiledata(int fd, off_t size) {
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char buf[BUFSIZ];
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@ -226,10 +192,8 @@ responsefile(void) {
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r = stat(reqbuf, &st);
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if(r == -1 || (ffd = open(reqbuf, O_RDONLY)) == -1) {
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logerrmsg("%s requests unknown path %s\n", host, reqbuf);
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if(responsehdr(HttpNotFound) != -1
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&& responsecontenttype(texthtml) != -1)
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;
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else
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if(putresentry(HEADER, HttpNotFound, tstamp()) == -1
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|| putresentry(CONTENTTYPE, texthtml) == -1)
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return;
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if(req.type == GET)
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writetext("\r\n<html><body>404 Not Found</body></html>\r\n");
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@ -239,9 +203,7 @@ responsefile(void) {
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memcpy(mod, asctime(gmtime(&t)), 24);
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mod[24] = 0;
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if(!strcmp(reqmod, mod)) {
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if(responsehdr(HttpNotModified) != -1)
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;
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else
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if(putresentry(HEADER, HttpNotModified, tstamp()) == -1)
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return;
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} else {
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if((p = strrchr(reqbuf, '.'))) {
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@ -252,12 +214,10 @@ responsefile(void) {
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break;
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}
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}
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if(responsehdr(HttpOk) != -1
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&& responsemodified(mod) != -1
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&& responsecontentlen(st.st_size) != -1
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&& responsecontenttype(mimetype) != -1)
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;
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else
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if(putresentry(HEADER, HttpOk, tstamp()) == -1
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|| putresentry(MODIFIED, mod) == -1
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|| putresentry(CONTENTLEN, st.st_size) == -1
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|| putresentry(CONTENTTYPE, mimetype) == -1)
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return;
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if(req.type == GET && writetext("\r\n") != -1)
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responsefiledata(ffd, st.st_size);
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@ -270,10 +230,8 @@ void
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responsedirdata(DIR *d) {
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struct dirent *e;
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if(responsehdr(HttpOk) != -1
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&& responsecontenttype(texthtml) != -1)
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;
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else
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if(putresentry(HEADER, HttpOk, tstamp()) == -1
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|| putresentry(CONTENTTYPE, texthtml) == -1)
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return;
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if(req.type == GET) {
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if(writetext("\r\n<html><body><a href='..'>..</a><br>\r\n") == -1)
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@ -304,11 +262,9 @@ responsedir(void) {
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reqbuf[len++] = '/';
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reqbuf[len] = 0;
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logmsg("redirecting %s to %s%s\n", host, location, reqbuf);
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if(responsehdr(HttpMoved) != -1
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&& responselocation(location, reqbuf) != -1
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&& responsecontenttype(texthtml) != -1)
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;
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else
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if(putresentry(HEADER, HttpMoved, tstamp()) == -1
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|| putresentry(LOCATION, location, reqbuf) == -1
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|| putresentry(CONTENTTYPE, texthtml) == -1)
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return;
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if(req.type == GET)
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writetext("\r\n<html><body>301 Moved Permanently</a></body></html>\r\n");
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@ -348,7 +304,7 @@ responsecgi(void) {
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if(chdir(cgi_dir) == -1)
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logerrmsg("chdir to cgi directory %s failed: %s\n", cgi_dir, strerror(errno));
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if((cgi = popen(cgi_script, "r"))) {
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if(responsehdr(HttpOk) == -1)
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if(putresentry(HEADER, HttpOk, tstamp()) == -1)
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return;
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while((r = fread(resbuf, 1, MAXBUFLEN, cgi)) > 0) {
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if(writedata(resbuf, r) == -1) {
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@ -360,10 +316,8 @@ responsecgi(void) {
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}
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else {
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logerrmsg("%s requests %s, but cannot run cgi script %s\n", host, cgi_script, reqbuf);
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if(responsehdr(HttpNotFound) != -1
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&& responsecontenttype(texthtml) != -1)
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;
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else
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if(putresentry(HEADER, HttpNotFound, tstamp()) == -1
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|| putresentry(CONTENTTYPE, texthtml) == -1)
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return;
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if(req.type == GET)
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writetext("\r\n<html><body>404 Not Found</body></html>\r\n");
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@ -378,8 +332,8 @@ response(void) {
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for(p = reqbuf; *p; p++)
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if(*p == '\\' || (*p == '/' && *(p + 1) == '.')) { /* don't serve bogus or hidden files */
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logerrmsg("%s requests bogus or hidden file %s\n", host, reqbuf);
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if(responsehdr(HttpUnauthorized) != -1
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&& responsecontenttype(texthtml) != -1)
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if(putresentry(HEADER, HttpUnauthorized, tstamp()) == -1
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|| putresentry(CONTENTTYPE, texthtml) == -1)
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;
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else
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return;
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