2 * Copyright (c) 2006,2007 Steven Johnson <sjohnson@sakuraindustries.com>
3 * Copyright (c) 2007 Sergey Lyubka <valenok@gmail.com>
6 * "THE BEER-WARE LICENSE" (Revision 42):
7 * Sergey Lyubka wrote this file. As long as you retain this notice you
8 * can do whatever you want with this stuff. If we meet some day, and you think
9 * this stuff is worth it, you can buy me a beer in return.
16 #define CMDBUFSIZ 512 /* SSI command buffer size */
17 #define NEST_MAX 6 /* Maximum nesting level */
23 shttpd_callback_t func;
27 int state; /* Buffering state */
28 int cond; /* Conditional state */
29 FILE *fp; /* Icluded file stream */
30 char buf[CMDBUFSIZ]; /* SSI command buffer */
31 size_t nbuf; /* Bytes in a command buffer */
32 FILE *pipe; /* #exec stream */
33 struct ssi_func func; /* #call function */
37 struct conn *conn; /* Connection we belong to */
38 int nest; /* Current nesting level */
39 struct ssi_inc incs[NEST_MAX]; /* Nested includes */
42 enum { SSI_PASS, SSI_BUF, SSI_EXEC, SSI_CALL };
43 enum { SSI_GO, SSI_STOP }; /* Conditional states */
45 static const struct vec st = {"<!--#", 5};
48 shttpd_register_ssi_func(struct shttpd_ctx *ctx, const char *name,
49 shttpd_callback_t func, void *user_data)
53 if ((e = malloc(sizeof(*e))) != NULL) {
54 e->name = my_strdup(name);
56 e->user_data = user_data;
57 LL_TAIL(&ctx->ssi_funcs, &e->link);
62 free_ssi_funcs(struct shttpd_ctx *ctx)
64 struct llhead *lp, *tmp;
67 LL_FOREACH_SAFE(&ctx->ssi_funcs, lp, tmp) {
68 e = LL_ENTRY(lp, struct ssi_func, link);
74 static const struct ssi_func *
75 find_ssi_func(struct ssi *ssi, const char *name)
80 LL_FOREACH(&ssi->conn->ctx->ssi_funcs, lp) {
81 e = LL_ENTRY(lp, struct ssi_func, link);
82 if (!strcmp(name, e->name))
90 call(struct ssi *ssi, const char *name,
91 struct shttpd_arg *arg, char *buf, int len)
93 const struct ssi_func *ssi_func;
95 (void) memset(arg, 0, sizeof(*arg));
97 if ((ssi_func = find_ssi_func(ssi, name)) != NULL) {
98 arg->priv = ssi->conn;
99 arg->user_data = ssi_func->user_data;
107 evaluate(struct ssi *ssi, const char *name)
109 struct shttpd_arg arg;
111 call(ssi, name, &arg, NULL, 0);
113 return (arg.flags & SHTTPD_SSI_EVAL_TRUE);
117 pass(struct ssi_inc *inc, void *buf, int *n)
119 if (inc->cond == SSI_GO) {
120 (void) memcpy(buf, inc->buf, inc->nbuf);
124 inc->state = SSI_PASS;
128 get_path(struct conn *conn, const char *src,
129 int src_len, char *dst, int dst_len)
131 static struct vec accepted[] = {
132 {"\"", 1}, /* Relative to webserver CWD */
133 {"file=\"", 6}, /* Relative to current URI */
134 {"virtual=\"", 9}, /* Relative to document root */
141 for (vec = accepted; vec->len > 0; vec++)
142 if (src_len > vec->len && !memcmp(src, vec->ptr, vec->len)) {
145 if ((p = memchr(src, '"', src_len)) == NULL)
148 len = my_snprintf(dst, dst_len, "%s%c%s",
149 conn->ctx->document_root, DIRSEP, conn->uri);
150 while (len > 0 && dst[len] != '/')
154 } else if (vec->len == 9) {
155 len = my_snprintf(dst, dst_len, "%s%c",
156 conn->ctx->document_root, DIRSEP);
160 url_decode(src, p - src, dst, dst_len);
168 do_include(struct ssi *ssi)
170 struct ssi_inc *inc = ssi->incs + ssi->nest;
171 char buf[FILENAME_MAX];
174 assert(inc->nbuf >= 13);
176 if (inc->cond == SSI_STOP) {
177 /* Do nothing - conditional FALSE */
178 } else if (ssi->nest >= (int) NELEMS(ssi->incs) - 1) {
179 elog(E_LOG, ssi->conn,
180 "ssi: #include: maximum nested level reached");
181 } else if (!get_path(ssi->conn,
182 inc->buf + 13, inc->nbuf - 13, buf, sizeof(buf))) {
183 elog(E_LOG, ssi->conn, "ssi: bad #include: [%.*s]",
184 inc->nbuf, inc->buf);
185 } else if ((fp = fopen(buf, "r")) == NULL) {
186 elog(E_LOG, ssi->conn,
187 "ssi: fopen(%s): %s", buf, strerror(errno));
190 ssi->incs[ssi->nest].fp = fp;
191 ssi->incs[ssi->nest].nbuf = 0;
192 ssi->incs[ssi->nest].cond = SSI_GO;
197 trim_spaces(struct ssi_inc *inc)
199 unsigned char *p = inc->buf + inc->nbuf - 2;
201 /* Trim spaces from the right */
206 /* Shift pointer to the start of attributes */
207 for (p = inc->buf; !isspace(*p); p++);
208 while (*p && isspace(*p)) p++;
214 do_if(struct ssi *ssi)
216 struct ssi_inc *inc = ssi->incs + ssi->nest;
217 unsigned char *name = trim_spaces(inc);
219 inc->cond = evaluate(ssi, name) ? SSI_GO : SSI_STOP;
222 do_elif(struct ssi *ssi)
224 struct ssi_inc *inc = ssi->incs + ssi->nest;
225 unsigned char *name = trim_spaces(inc);
227 if (inc->cond == SSI_STOP && evaluate(ssi, name))
230 inc->cond = SSI_STOP;
233 do_endif(struct ssi *ssi)
235 ssi->incs[ssi->nest].cond = SSI_GO;
239 do_else(struct ssi *ssi)
241 struct ssi_inc *inc = ssi->incs + ssi->nest;
243 inc->cond = inc->cond == SSI_GO ? SSI_STOP : SSI_GO;
247 do_call2(struct ssi *ssi, char *buf, int len, int *n)
249 struct ssi_inc *inc = ssi->incs + ssi->nest;
250 struct shttpd_arg arg;
252 call(ssi, inc->buf, &arg, buf, len);
253 (*n) += arg.out.num_bytes;
254 if (arg.flags & SHTTPD_END_OF_OUTPUT)
255 inc->state = SSI_PASS;
259 do_call(struct ssi *ssi, char *buf, int len, int *n)
261 struct ssi_inc *inc = ssi->incs + ssi->nest;
262 unsigned char *name = trim_spaces(inc);
264 if (inc->cond == SSI_GO) {
265 (void) memmove(inc->buf, name, strlen(name) + 1);
266 inc->state = SSI_CALL;
267 do_call2(ssi, buf, len, n);
272 do_exec2(struct ssi *ssi, char *buf, int len, int *n)
274 struct ssi_inc *inc = ssi->incs + ssi->nest;
277 for (i = 0; i < len; i++) {
278 if ((ch = fgetc(inc->pipe)) == EOF) {
279 inc->state = SSI_PASS;
280 (void) pclose(inc->pipe);
290 do_exec(struct ssi *ssi, char *buf, int len, int *n)
292 struct ssi_inc *inc = ssi->incs + ssi->nest;
293 unsigned char *e, *p;
294 char cmd[sizeof(inc->buf)];
296 p = trim_spaces(inc);
298 if (inc->cond == SSI_STOP) {
299 /* Do nothing - conditional FALSE */
300 } else if (*p != '"' || (e = strchr(p + 1, '"')) == NULL) {
301 elog(E_LOG, ssi->conn, "ssi: bad exec(%s)", p);
302 } else if (!url_decode(p + 1, e - p - 1, cmd, sizeof(cmd))) {
303 elog(E_LOG, ssi->conn, "ssi: cannot url_decode: exec(%s)", p);
304 } else if ((inc->pipe = popen(cmd, "r")) == NULL) {
305 elog(E_LOG, ssi->conn, "ssi: popen(%s)", cmd);
307 inc->state = SSI_EXEC;
308 do_exec2(ssi, buf, len, n);
312 static const struct ssi_cmd {
315 } known_ssi_commands [] = {
316 {{"include ", 8}, do_include },
317 {{"if ", 3}, do_if },
318 {{"elif ", 5}, do_elif },
319 {{"else", 4}, do_else },
320 {{"endif", 5}, do_endif },
321 {{"call ", 5}, do_call },
322 {{"exec ", 5}, do_exec },
327 do_command(struct ssi *ssi, char *buf, size_t len, int *n)
329 struct ssi_inc *inc = ssi->incs + ssi->nest;
330 const struct ssi_cmd *cmd;
333 assert(inc->nbuf <= len);
334 inc->state = SSI_PASS;
336 for (cmd = known_ssi_commands; cmd->func != NULL; cmd++)
337 if (inc->nbuf > (size_t) st.len + cmd->vec.len &&
338 !memcmp(inc->buf + st.len, cmd->vec.ptr, cmd->vec.len)) {
339 cmd->func(ssi, buf, len, n);
343 if (cmd->func == NULL)
350 read_ssi(struct stream *stream, void *vbuf, size_t len)
352 struct ssi *ssi = stream->conn->ssi;
353 struct ssi_inc *inc = ssi->incs + ssi->nest;
360 if (inc->state == SSI_CALL)
361 do_call2(ssi, buf, len, &n);
362 else if (inc->state == SSI_EXEC)
363 do_exec2(ssi, buf, len, &n);
365 while (n + inc->nbuf < len && (ch = fgetc(inc->fp)) != EOF)
367 switch (inc->state) {
372 inc->buf[inc->nbuf++] = ch;
373 inc->state = SSI_BUF;
374 } else if (inc->cond == SSI_GO) {
380 if (inc->nbuf >= sizeof(inc->buf) - 1) {
381 pass(inc, buf + n, &n);
382 } else if (ch == '>' &&
383 !memcmp(inc->buf + inc->nbuf - 2, "--", 2)) {
384 do_command(ssi, buf + n, len - n, &n);
385 inc = ssi->incs + ssi->nest;
387 inc->buf[inc->nbuf++] = ch;
389 /* If not SSI tag, pass it */
390 if (inc->nbuf <= (size_t) st.len &&
391 memcmp(inc->buf, st.ptr, inc->nbuf) != 0)
392 pass(inc, buf + n, &n);
401 if (ssi->nest > 0 && n + inc->nbuf < len && ch == EOF) {
402 (void) fclose(inc->fp);
413 close_ssi(struct stream *stream)
415 struct ssi *ssi = stream->conn->ssi;
418 for (i = 0; i < NELEMS(ssi->incs); i++) {
419 if (ssi->incs[i].fp != NULL)
420 (void) fclose(ssi->incs[i].fp);
421 if (ssi->incs[i].pipe != NULL)
422 (void) pclose(ssi->incs[i].pipe);
429 do_ssi(struct conn *c)
434 (void) strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S GMT",
435 localtime(¤t_time));
437 c->loc.io.head = c->loc.headers_len = my_snprintf(c->loc.io.buf,
439 "HTTP/1.1 200 OK\r\n"
441 "Content-Type: text/html\r\n"
442 "Connection: close\r\n\r\n",
446 c->loc.io_class = &io_ssi;
447 c->loc.flags |= FLAG_R | FLAG_ALWAYS_READY;
449 if (c->method == METHOD_HEAD) {
450 stop_stream(&c->loc);
451 } else if ((ssi = calloc(1, sizeof(struct ssi))) == NULL) {
452 send_server_error(c, 500, "Cannot allocate SSI descriptor");
454 ssi->incs[0].fp = fdopen(c->loc.chan.fd, "r");
460 const struct io_class io_ssi = {