lighttpd1.4/src/mod_ssi.c

#include "first.h"

#include "fdevent.h"
#include "fdlog.h"
#include "log.h"
#include "array.h"
#include "buffer.h"
#include "chunk.h"
#include "http_cgi.h"
#include "http_chunk.h"
#include "http_etag.h"
#include "http_header.h"
#include "request.h"
#include "stat_cache.h"

#include "plugin.h"

#include "response.h"

#include "sys-socket.h"
#include "sys-time.h"

#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

#ifdef HAVE_PWD_H
# include <pwd.h>
#endif

#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif

typedef struct {
	const array *ssi_extension;
	const buffer *content_type;
	unsigned short conditional_requests;
	unsigned short ssi_exec;
	unsigned short ssi_recursion_max;
} plugin_config;

typedef struct {
	PLUGIN_DATA;
	plugin_config defaults;
	plugin_config conf;
	array *ssi_vars;
	array *ssi_cgi_env;
	buffer stat_fn;
	buffer timefmt;
} plugin_data;

typedef struct {
	array *ssi_vars;
	array *ssi_cgi_env;
	buffer *stat_fn;
	buffer *timefmt;
	int sizefmt;

	int if_level, if_is_false_level, if_is_false, if_is_false_endif;
	unsigned short ssi_recursion_depth;

	chunkqueue wq;
	log_error_st *errh;
	plugin_config conf;
} handler_ctx;

static handler_ctx * handler_ctx_init(plugin_data *p, log_error_st *errh) {
	handler_ctx *hctx = calloc(1, sizeof(*hctx));
	force_assert(hctx);
	hctx->errh = errh;
	hctx->timefmt = &p->timefmt;
	hctx->stat_fn = &p->stat_fn;
	hctx->ssi_vars = p->ssi_vars;
	hctx->ssi_cgi_env = p->ssi_cgi_env;
	memcpy(&hctx->conf, &p->conf, sizeof(plugin_config));
	return hctx;
}

static void handler_ctx_free(handler_ctx *hctx) {
	chunkqueue_reset(&hctx->wq);
	free(hctx);
}

/* The newest modified time of included files for include statement */
static volatile unix_time64_t include_file_last_mtime = 0;

INIT_FUNC(mod_ssi_init) {
	plugin_data *p;

	p = calloc(1, sizeof(*p));
	force_assert(p);

	p->ssi_vars = array_init(8);
	p->ssi_cgi_env = array_init(32);

	return p;
}

FREE_FUNC(mod_ssi_free) {
	plugin_data *p = p_d;
	array_free(p->ssi_vars);
	array_free(p->ssi_cgi_env);
	free(p->timefmt.ptr);
	free(p->stat_fn.ptr);
}

static void mod_ssi_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
    switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
      case 0: /* ssi.extension */
        pconf->ssi_extension = cpv->v.a;
        break;
      case 1: /* ssi.content-type */
        pconf->content_type = cpv->v.b;
        break;
      case 2: /* ssi.conditional-requests */
        pconf->conditional_requests = cpv->v.u;
        break;
      case 3: /* ssi.exec */
        pconf->ssi_exec = cpv->v.u;
        break;
      case 4: /* ssi.recursion-max */
        pconf->ssi_recursion_max = cpv->v.shrt;
        break;
      default:/* should not happen */
        return;
    }
}

static void mod_ssi_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
    do {
        mod_ssi_merge_config_cpv(pconf, cpv);
    } while ((++cpv)->k_id != -1);
}

static void mod_ssi_patch_config(request_st * const r, plugin_data * const p) {
    memcpy(&p->conf, &p->defaults, sizeof(plugin_config));
    for (int i = 1, used = p->nconfig; i < used; ++i) {
        if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
            mod_ssi_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]);
    }
}

SETDEFAULTS_FUNC(mod_ssi_set_defaults) {
    static const config_plugin_keys_t cpk[] = {
      { CONST_STR_LEN("ssi.extension"),
        T_CONFIG_ARRAY_VLIST,
        T_CONFIG_SCOPE_CONNECTION }
     ,{ CONST_STR_LEN("ssi.content-type"),
        T_CONFIG_STRING,
        T_CONFIG_SCOPE_CONNECTION }
     ,{ CONST_STR_LEN("ssi.conditional-requests"),
        T_CONFIG_BOOL,
        T_CONFIG_SCOPE_CONNECTION }
     ,{ CONST_STR_LEN("ssi.exec"),
        T_CONFIG_BOOL,
        T_CONFIG_SCOPE_CONNECTION }
     ,{ CONST_STR_LEN("ssi.recursion-max"),
        T_CONFIG_SHORT,
        T_CONFIG_SCOPE_CONNECTION }
     ,{ NULL, 0,
        T_CONFIG_UNSET,
        T_CONFIG_SCOPE_UNSET }
    };

    plugin_data * const p = p_d;
    if (!config_plugin_values_init(srv, p, cpk, "mod_ssi"))
        return HANDLER_ERROR;

    /* process and validate config directives
     * (init i to 0 if global context; to 1 to skip empty global context) */
    for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
        config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
        for (; -1 != cpv->k_id; ++cpv) {
            switch (cpv->k_id) {
              case 0: /* ssi.extension */
                break;
              case 1: /* ssi.content-type */
                if (buffer_is_blank(cpv->v.b))
                    cpv->v.b = NULL;
                break;
              case 2: /* ssi.conditional-requests */
              case 3: /* ssi.exec */
              case 4: /* ssi.recursion-max */
                break;
              default:/* should not happen */
                break;
            }
        }
    }

    p->defaults.ssi_exec = 1;

    /* initialize p->defaults from global config context */
    if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
        const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
        if (-1 != cpv->k_id)
            mod_ssi_merge_config(&p->defaults, cpv);
    }

    return HANDLER_GO_ON;
}




#define TK_AND                             1
#define TK_OR                              2
#define TK_EQ                              3
#define TK_NE                              4
#define TK_GT                              5
#define TK_GE                              6
#define TK_LT                              7
#define TK_LE                              8
#define TK_NOT                             9
#define TK_LPARAN                         10
#define TK_RPARAN                         11
#define TK_VALUE                          12

typedef struct {
    const char *input;
    size_t offset;
    size_t size;
    int in_brace;
    int depth;
    handler_ctx *p;
} ssi_tokenizer_t;

typedef struct {
    buffer  str;
    enum { SSI_TYPE_UNSET, SSI_TYPE_BOOL, SSI_TYPE_STRING } type;
    int     bo;
} ssi_val_t;

__attribute_pure__
static int ssi_val_tobool(const ssi_val_t *B) {
    return B->type == SSI_TYPE_BOOL ? B->bo : !buffer_is_blank(&B->str);
}

__attribute_pure__
static int ssi_eval_expr_cmp(const ssi_val_t * const v1, const ssi_val_t * const v2, const int cond) {
    int cmp = (v1->type != SSI_TYPE_BOOL && v2->type != SSI_TYPE_BOOL)
      ? strcmp(v1->str.ptr ? v1->str.ptr : "",
               v2->str.ptr ? v2->str.ptr : "")
      : ssi_val_tobool(v1) - ssi_val_tobool(v2);
    switch (cond) {
      case TK_EQ: return (cmp == 0);
      case TK_NE: return (cmp != 0);
      case TK_GE: return (cmp >= 0);
      case TK_GT: return (cmp >  0);
      case TK_LE: return (cmp <= 0);
      case TK_LT: return (cmp <  0);
      default:    return 0;/*(should not happen)*/
    }
}

__attribute_pure__
static int ssi_eval_expr_cmp_bool(const ssi_val_t * const v1, const ssi_val_t * const v2, const int cond) {
    return (cond == TK_OR)
      ? ssi_val_tobool(v1) || ssi_val_tobool(v2)  /* TK_OR */
      : ssi_val_tobool(v1) && ssi_val_tobool(v2); /* TK_AND */
}

static void ssi_eval_expr_append_val(buffer * const b, const char *s, const size_t slen) {
    if (buffer_is_blank(b))
        buffer_append_string_len(b, s, slen);
    else if (slen)
        buffer_append_str2(b, CONST_STR_LEN(" "), s, slen);
}

static int ssi_expr_tokenizer(ssi_tokenizer_t * const t, buffer * const token) {
    size_t i;

    while (t->offset < t->size
           && (t->input[t->offset] == ' ' || t->input[t->offset] == '\t')) {
        ++t->offset;
    }
    if (t->offset >= t->size)
        return 0;
    if (t->input[t->offset] == '\0') {
        log_error(t->p->errh, __FILE__, __LINE__,
          "pos: %zu foobar", t->offset+1);
        return -1;
    }

    switch (t->input[t->offset]) {
      case '=':
       #if 0 /*(maybe accept "==", too)*/
        if (t->input[t->offset + 1] == '=')
            ++t->offset;
       #endif
        t->offset++;
        return TK_EQ;
      case '>':
        if (t->input[t->offset + 1] == '=') {
            t->offset += 2;
            return TK_GE;
        }
        else {
            t->offset += 1;
            return TK_GT;
        }
      case '<':
        if (t->input[t->offset + 1] == '=') {
            t->offset += 2;
            return TK_LE;
        }
        else {
            t->offset += 1;
            return TK_LT;
        }
      case '!':
        if (t->input[t->offset + 1] == '=') {
            t->offset += 2;
            return TK_NE;
        }
        else {
            t->offset += 1;
            return TK_NOT;
        }
      case '&':
        if (t->input[t->offset + 1] == '&') {
            t->offset += 2;
            return TK_AND;
        }
        else {
            log_error(t->p->errh, __FILE__, __LINE__,
              "pos: %zu missing second &", t->offset+1);
            return -1;
        }
      case '|':
        if (t->input[t->offset + 1] == '|') {
            t->offset += 2;
            return TK_OR;
        }
        else {
            log_error(t->p->errh, __FILE__, __LINE__,
              "pos: %zu missing second |", t->offset+1);
            return -1;
        }
      case '(':
        t->offset++;
        t->in_brace++;
        return TK_LPARAN;
      case ')':
        t->offset++;
        t->in_brace--;
        return TK_RPARAN;
      case '\'':
        /* search for the terminating "'" */
        i = 1;
        while (t->input[t->offset + i] && t->input[t->offset + i] != '\'')
            ++i;
        if (t->input[t->offset + i]) {
            ssi_eval_expr_append_val(token, t->input + t->offset + 1, i-1);
            t->offset += i + 1;
            return TK_VALUE;
        }
        else {
            log_error(t->p->errh, __FILE__, __LINE__,
              "pos: %zu missing closing quote", t->offset+1);
            return -1;
        }
      case '$': {
        const char *var;
        size_t varlen;
        if (t->input[t->offset + 1] == '{') {
            i = 2;
            while (t->input[t->offset + i] && t->input[t->offset + i] != '}')
                ++i;
            if (t->input[t->offset + i] != '}') {
                log_error(t->p->errh, __FILE__, __LINE__,
                  "pos: %zu missing closing curly-brace", t->offset+1);
                return -1;
            }
            ++i; /* step past '}' */
            var = t->input + t->offset + 2;
            varlen = i-3;
        }
        else {
            for (i = 1; light_isalpha(t->input[t->offset + i]) ||
                    t->input[t->offset + i] == '_' ||
                    ((i > 1) && light_isdigit(t->input[t->offset + i])); ++i) ;
            var = t->input + t->offset + 1;
            varlen = i-1;
        }

        const data_string *ds;
        if ((ds = (const data_string *)
                  array_get_element_klen(t->p->ssi_cgi_env, var, varlen))
            || (ds = (const data_string *)
                     array_get_element_klen(t->p->ssi_vars, var, varlen)))
            ssi_eval_expr_append_val(token, BUF_PTR_LEN(&ds->value));
        t->offset += i;
        return TK_VALUE;
      }
      default:
        for (i = 0; isgraph(((unsigned char *)t->input)[t->offset + i]); ++i) {
            char d = t->input[t->offset + i];
            switch(d) {
            default: continue;
            case ' ':
            case '\t':
            case ')':
            case '(':
            case '\'':
            case '=':
            case '!':
            case '<':
            case '>':
            case '&':
            case '|':
                break;
            }
            break;
        }
        ssi_eval_expr_append_val(token, t->input + t->offset, i);
        t->offset += i;
        return TK_VALUE;
    }
}

static int ssi_eval_expr_loop(ssi_tokenizer_t * const t, ssi_val_t * const v);

static int ssi_eval_expr_step(ssi_tokenizer_t * const t, ssi_val_t * const v) {
    buffer_clear(&v->str);
    v->type = SSI_TYPE_UNSET; /*(not SSI_TYPE_BOOL)*/
    int next;
    const int level = t->in_brace;
    switch ((next = ssi_expr_tokenizer(t, &v->str))) {
      case TK_VALUE:
        do { next = ssi_expr_tokenizer(t, &v->str); } while (next == TK_VALUE);
        return next;
      case TK_LPARAN:
        if (t->in_brace > 16) return -1; /*(arbitrary limit)*/
        next = ssi_eval_expr_loop(t, v);
        if (next == TK_RPARAN && level == t->in_brace) {
            int result = ssi_val_tobool(v);
            next = ssi_eval_expr_step(t, v); /*(resets v)*/
            v->bo = result;
            v->type = SSI_TYPE_BOOL;
            return (next==TK_AND || next==TK_OR || next==TK_RPARAN || 0==next)
              ? next
              : -1;
        }
        else
            return -1;
      case TK_RPARAN:
        return t->in_brace >= 0 ? TK_RPARAN : -1;
      case TK_NOT:
        if (++t->depth > 16) return -1; /*(arbitrary limit)*/
        next = ssi_eval_expr_step(t, v);
        --t->depth;
        if (-1 == next) return next;
        v->bo = !ssi_val_tobool(v);
        v->type = SSI_TYPE_BOOL;
        return next;
      default:
        return next;
    }
}

static int ssi_eval_expr_loop_cmp(ssi_tokenizer_t * const t, ssi_val_t * const v1, int cond) {
    ssi_val_t v2 = { { NULL, 0, 0 }, SSI_TYPE_UNSET, 0 };
    int next = ssi_eval_expr_step(t, &v2);
    if (-1 != next) {
        v1->bo = ssi_eval_expr_cmp(v1, &v2, cond);
        v1->type = SSI_TYPE_BOOL;
    }
    buffer_free_ptr(&v2.str);
    return next;
}

static int ssi_eval_expr_loop(ssi_tokenizer_t * const t, ssi_val_t * const v1) {
    int next = ssi_eval_expr_step(t, v1);
    switch (next) {
      case TK_AND: case TK_OR:
        break;
      case TK_EQ:  case TK_NE:
      case TK_GT:  case TK_GE:
      case TK_LT:  case TK_LE:
        next = ssi_eval_expr_loop_cmp(t, v1, next);
        if (next == TK_RPARAN || 0 == next) return next;
        if (next != TK_AND && next != TK_OR) {
            log_error(t->p->errh, __FILE__, __LINE__,
              "pos: %zu parser failed somehow near here", t->offset+1);
            return -1;
        }
        break;
      default:
        return next;
    }

    /*(Note: '&&' and '||' evaluations are not short-circuited)*/
    ssi_val_t v2 = { { NULL, 0, 0 }, SSI_TYPE_UNSET, 0 };
    do {
        int cond = next;
        next = ssi_eval_expr_step(t, &v2);
        switch (next) {
          case TK_AND: case TK_OR: case 0:
            break;
          case TK_EQ:  case TK_NE:
          case TK_GT:  case TK_GE:
          case TK_LT:  case TK_LE:
            next = ssi_eval_expr_loop_cmp(t, &v2, next);
            if (-1 == next) continue;
            break;
          case TK_RPARAN:
            break;
          default:
            continue;
        }
        v1->bo = ssi_eval_expr_cmp_bool(v1, &v2, cond);
        v1->type = SSI_TYPE_BOOL;
    } while (next == TK_AND || next == TK_OR);
    buffer_free_ptr(&v2.str);
    return next;
}

static int ssi_eval_expr(handler_ctx *p, const char *expr) {
    ssi_tokenizer_t t;
    t.input = expr;
    t.offset = 0;
    t.size = strlen(expr);
    t.in_brace = 0;
    t.depth = 0;
    t.p = p;

    ssi_val_t v = { { NULL, 0, 0 }, SSI_TYPE_UNSET, 0 };
    int rc = ssi_eval_expr_loop(&t, &v);
    rc = (0 == rc && 0 == t.in_brace && 0 == t.depth)
      ? ssi_val_tobool(&v)
      : -1;
    buffer_free_ptr(&v.str);

    return rc;
}




static int ssi_env_add(void *venv, const char *key, size_t klen, const char *val, size_t vlen) {
	array_set_key_value((array *)venv, key, klen, val, vlen);
	return 0;
}

static int build_ssi_cgi_vars(request_st * const r, handler_ctx * const p) {
	http_cgi_opts opts = { 0, 0, NULL, NULL };
	/* temporarily remove Authorization from request headers
	 * so that Authorization does not end up in SSI environment */
	buffer *vb_auth = http_header_request_get(r, HTTP_HEADER_AUTHORIZATION, CONST_STR_LEN("Authorization"));
	buffer b_auth;
	if (vb_auth) {
		memcpy(&b_auth, vb_auth, sizeof(buffer));
		memset(vb_auth, 0, sizeof(buffer));
	}

	array_reset_data_strings(p->ssi_cgi_env);

	if (0 != http_cgi_headers(r, &opts, ssi_env_add, p->ssi_cgi_env)) {
		r->http_status = 400;
		return -1;
	}

	if (vb_auth) {
		memcpy(vb_auth, &b_auth, sizeof(buffer));
	}

	return 0;
}

static void mod_ssi_timefmt (buffer * const b, buffer *timefmtb, unix_time64_t t, int localtm) {
    struct tm tm;
    const char * const timefmt = buffer_is_blank(timefmtb)
      ? "%a, %d %b %Y %T %Z"
      : timefmtb->ptr;
    buffer_append_strftime(b, timefmt, localtm
                                       ? localtime64_r(&t, &tm)
                                       : gmtime64_r(&t, &tm));
    if (buffer_is_blank(b))
        buffer_copy_string_len(b, CONST_STR_LEN("(none)"));
}

static int mod_ssi_process_file(request_st *r, handler_ctx *p, struct stat *st);

static int process_ssi_stmt(request_st * const r, handler_ctx * const p, const char ** const l, size_t n, struct stat * const st) {

	/**
	 * <!--#element attribute=value attribute=value ... -->
	 *
	 * config       DONE
	 *   errmsg     -- missing
	 *   sizefmt    DONE
	 *   timefmt    DONE
	 * echo         DONE
	 *   var        DONE
	 *   encoding   -- missing
	 * exec         DONE
	 *   cgi        -- never
	 *   cmd        DONE
	 * fsize        DONE
	 *   file       DONE
	 *   virtual    DONE
	 * flastmod     DONE
	 *   file       DONE
	 *   virtual    DONE
	 * include      DONE
	 *   file       DONE
	 *   virtual    DONE
	 * printenv     DONE
	 * set          DONE
	 *   var        DONE
	 *   value      DONE
	 *
	 * if           DONE
	 * elif         DONE
	 * else         DONE
	 * endif        DONE
	 *
	 *
	 * expressions
	 * AND, OR      DONE
	 * comp         DONE
	 * ${...}       -- missing
	 * $...         DONE
	 * '...'        DONE
	 * ( ... )      DONE
	 *
	 *
	 *
	 * ** all DONE **
	 * DATE_GMT
	 *   The current date in Greenwich Mean Time.
	 * DATE_LOCAL
	 *   The current date in the local time zone.
	 * DOCUMENT_NAME
	 *   The filename (excluding directories) of the document requested by the user.
	 * DOCUMENT_URI
	 *   The (%-decoded) URL path of the document requested by the user. Note that in the case of nested include files, this is not then URL for the current document.
	 * LAST_MODIFIED
	 *   The last modification date of the document requested by the user.
	 * USER_NAME
	 *   Contains the owner of the file which included it.
	 *
	 */

	size_t i, ssicmd = 0;
	buffer *tb = NULL;

	static const struct {
		const char *var;
		enum { SSI_UNSET, SSI_ECHO, SSI_FSIZE, SSI_INCLUDE, SSI_FLASTMOD,
				SSI_CONFIG, SSI_PRINTENV, SSI_SET, SSI_IF, SSI_ELIF,
				SSI_ELSE, SSI_ENDIF, SSI_EXEC, SSI_COMMENT } type;
	} ssicmds[] = {
		{ "echo",     SSI_ECHO },
		{ "include",  SSI_INCLUDE },
		{ "flastmod", SSI_FLASTMOD },
		{ "fsize",    SSI_FSIZE },
		{ "config",   SSI_CONFIG },
		{ "printenv", SSI_PRINTENV },
		{ "set",      SSI_SET },
		{ "if",       SSI_IF },
		{ "elif",     SSI_ELIF },
		{ "endif",    SSI_ENDIF },
		{ "else",     SSI_ELSE },
		{ "exec",     SSI_EXEC },
		{ "comment",  SSI_COMMENT },

		{ NULL, SSI_UNSET }
	};

	for (i = 0; ssicmds[i].var; i++) {
		if (0 == strcmp(l[1], ssicmds[i].var)) {
			ssicmd = ssicmds[i].type;
			break;
		}
	}

	chunkqueue * const cq = &p->wq;

	switch(ssicmd) {
	case SSI_ECHO: {
		/* echo */
		int var = 0;
		/* int enc = 0; */
		const char *var_val = NULL;

		static const struct {
			const char *var;
			enum {
				SSI_ECHO_UNSET,
				SSI_ECHO_DATE_GMT,
				SSI_ECHO_DATE_LOCAL,
				SSI_ECHO_DOCUMENT_NAME,
				SSI_ECHO_DOCUMENT_URI,
				SSI_ECHO_LAST_MODIFIED,
				SSI_ECHO_USER_NAME,
				SSI_ECHO_SCRIPT_URI,
				SSI_ECHO_SCRIPT_URL,
			} type;
		} echovars[] = {
			{ "DATE_GMT",      SSI_ECHO_DATE_GMT },
			{ "DATE_LOCAL",    SSI_ECHO_DATE_LOCAL },
			{ "DOCUMENT_NAME", SSI_ECHO_DOCUMENT_NAME },
			{ "DOCUMENT_URI",  SSI_ECHO_DOCUMENT_URI },
			{ "LAST_MODIFIED", SSI_ECHO_LAST_MODIFIED },
			{ "USER_NAME",     SSI_ECHO_USER_NAME },
			{ "SCRIPT_URI",    SSI_ECHO_SCRIPT_URI },
			{ "SCRIPT_URL",    SSI_ECHO_SCRIPT_URL },

			{ NULL, SSI_ECHO_UNSET }
		};

/*
		static const struct {
			const char *var;
			enum { SSI_ENC_UNSET, SSI_ENC_URL, SSI_ENC_NONE, SSI_ENC_ENTITY } type;
		} encvars[] = {
			{ "url",          SSI_ENC_URL },
			{ "none",         SSI_ENC_NONE },
			{ "entity",       SSI_ENC_ENTITY },

			{ NULL, SSI_ENC_UNSET }
		};
*/

		for (i = 2; i < n; i += 2) {
			if (0 == strcmp(l[i], "var")) {
				int j;

				var_val = l[i+1];

				for (j = 0; echovars[j].var; j++) {
					if (0 == strcmp(l[i+1], echovars[j].var)) {
						var = echovars[j].type;
						break;
					}
				}
			} else if (0 == strcmp(l[i], "encoding")) {
/*
				int j;

				for (j = 0; encvars[j].var; j++) {
					if (0 == strcmp(l[i+1], encvars[j].var)) {
						enc = encvars[j].type;
						break;
					}
				}
*/
			} else {
				log_error(r->conf.errh, __FILE__, __LINE__,
				  "ssi: unknown attribute for %s %s", l[1], l[i]);
			}
		}

		if (p->if_is_false) break;

		if (!var_val) {
			log_error(r->conf.errh, __FILE__, __LINE__,
			  "ssi: %s var is missing", l[1]);
			break;
		}

		switch(var) {
		case SSI_ECHO_USER_NAME: {
			tb = r->tmp_buf;
			buffer_clear(tb);
#ifdef HAVE_PWD_H
			struct passwd *pw;
			if (NULL == (pw = getpwuid(st->st_uid))) {
				buffer_append_int(tb, st->st_uid);
			} else {
				buffer_copy_string(tb, pw->pw_name);
			}
#else
			buffer_append_int(tb, st->st_uid);
#endif
			chunkqueue_append_mem(cq, BUF_PTR_LEN(tb));
			break;
		}