alias.c

用于移植到嵌入式linux系统的boa http服务器

               l5 + 1);
    } else if (document_root) {
        /* no aliasing, no userdir... */
        unsigned int l1, l2, l3;

        l1 = strlen(document_root);
        l2 = strlen(req->request_uri);
        if (virtualhost)
            l3 = strlen(req->local_ip_addr);
        else
            l3 = 0;

        if (l1 + 1 + l2 + l3 + 1 > sizeof(buffer)) {
            log_error_doc(req);
            fputs("uri too long!\n", stderr);
            send_r_bad_request(req);
            return 0;
        }

        /* the 'l2 + 1' is there so we copy the '\0' as well */
        memcpy(buffer, document_root, l1);
        if (virtualhost) {
            buffer[l1] = '/';
            memcpy(buffer + l1 + 1, req->local_ip_addr, l3);
            memcpy(buffer + l1 + 1 + l3, req->request_uri, l2 + 1);
        } else
            memcpy(buffer + l1, req->request_uri, l2 + 1);
    } else {
        /* not aliased.  not userdir.  not part of document_root.  BAIL */
        send_r_not_found(req);
        return 0;
    }

    /* if here,
     * o it may be aliased but it's not a redirect or a script...
     * o it may be a homedir
     * o it may be a document_root resource (with or without virtual host)
     */

    req->pathname = strdup(buffer);
    if (!req->pathname) {
        boa_perror(req, "Could not strdup buffer for req->pathname!");
        return 0;
    }

#ifdef FASCIST_LOGGING
        log_error_time();
        fprintf(stderr, "%s:%d - buffer is: \"%s\"\n",
                __FILE__, __LINE__, buffer);
        log_error_time();
        fprintf(stderr, "%s:%d - compare \"%s\" and \"%s\": %d\n",
                __FILE__, __LINE__, get_mime_type(buffer), CGI_MIME_TYPE, strcmp(CGI_MIME_TYPE, get_mime_type(buffer)));
#endif

    /* below we support cgis outside of a ScriptAlias */
    if (strcmp(CGI_MIME_TYPE, get_mime_type(req->pathname)) == 0) { /* cgi */
        /* FIXME */
        /* script_name could end up as /cgi-bin/bob/extra_path */
        req->script_name = strdup(req->request_uri);
        if (!req->script_name) {
            boa_perror(req, "Could not strdup req->request_uri for req->script_name.");
            return 0;
        }
        if (req->http_version == HTTP09)
            req->cgi_type = NPH;
        else
            req->cgi_type = CGI;
        return 1;
    } else if (req->method == M_POST) { /* POST to non-script */
        /* it's not a cgi, but we try to POST??? */
        log_error_doc(req);
        fputs("POST to non-script disallowed.\n", stderr);
        send_r_bad_request(req);
        return 0;
    } else                      /* we are done!! */
        return 1;
}

/*
 * Name: init_script_alias
 *
 * Description: Performs full parsing on a ScriptAlias request
 * Sets path_info and script_name
 *
 * Return values:
 *
 * 0: failure, shut down
 * 1: success, continue
 */

static int init_script_alias(request * req, alias * current1, unsigned int uri_len)
{
    static char pathname[MAX_HEADER_LENGTH + 1];
    struct stat statbuf;

    int i = 0;
    char c;
    int err;

    /* copies the "real" path + the non-alias portion of the
       uri to pathname.
     */

    if (vhost_root) {
        /* vhost_root + IP + host + / + cgi-bin + resource */
        unsigned int l1, l2, l3;
        char *ap;

        l1 = strlen(vhost_root);
        l2 = strlen(req->local_ip_addr);
        ap = req->host;
        l3 = strlen(ap);

        if (l1 + 1 + l2 + 1 + l3 + 1 + current1->real_len +
            (uri_len - current1->fake_len) + 1 > sizeof(pathname)) {
            log_error_doc(req);
            fputs("uri too long!\n", stderr);
            send_r_bad_request(req);
            return 0;
        }
        memcpy(pathname, vhost_root, l1);
        pathname[l1] = '/';
        memcpy(pathname + l1 + 1, req->local_ip_addr, l2);
        pathname[l1 + 1 + l2] = '/';
        memcpy(pathname + l1 + 1 + l2 + 1, ap, l3);
        pathname[l1 + 1 + l2 + 1 + l3] = '/';
        memcpy(pathname + l1 + 1 + l2 + 1 + l3 + 1, current1->realname,
               current1->real_len);
        memcpy(pathname + l1 + 1 + l2 + 1 + l3 + 1 + current1->real_len,
               &req->request_uri[current1->fake_len],
               uri_len - current1->fake_len + 1); /* the +1 copies the NUL */
    } else {
        if (current1->real_len + uri_len -
            current1->fake_len + 1 > sizeof(pathname)) {
            log_error_doc(req);
            fputs("uri too long!\n", stderr);
            send_r_bad_request(req);
            return 0;
        }
        memcpy(pathname, current1->realname, current1->real_len);
        memcpy(pathname + current1->real_len,
               &req->request_uri[current1->fake_len],
               uri_len - current1->fake_len + 1); /* the +1 copies the NUL */
    }
#ifdef FASCIST_LOGGING
    log_error_time();
    fprintf(stderr,
            "%s:%d - pathname in init_script_alias is: \"%s\" (\"%s\")\n",
            __FILE__, __LINE__, pathname, pathname + current1->real_len);
#endif
    if (strncmp("nph-", pathname + current1->real_len, 4) == 0
        || (req->http_version == HTTP09))
        req->cgi_type = NPH;
    else
        req->cgi_type = CGI;

    /* start at the beginning of the actual uri...
       (in /cgi-bin/bob, start at the 'b' in bob */
    i = current1->real_len;
    c = '\0';

    /* go to first and successive '/' and keep checking
     * if it is a full pathname
     * on success (stat (not lstat) of file is a *regular file*)
     */
    do {
        c = pathname[++i];
        if (c == '/') {
            pathname[i] = '\0';
            err = stat(pathname, &statbuf);
            if (err == -1) {
                send_r_not_found(req);
                return 0;
            }

            /* is it a dir? */
            if (!S_ISDIR(statbuf.st_mode)) {
                /* check access */
                /* the file must be readable+executable by at least
                 * u,g,or o 
                 */
                if (!S_ISREG(statbuf.st_mode) || access(pathname, R_OK|X_OK)) {
                    send_r_forbidden(req);
                    return 0;
                }
                pathname[i] = '/';
                /* stop here */
                break;
            }
            /* if here, it's a dir (or it points to one!) */
            pathname[i] = '/';
        }
    } while (c != '\0');

    req->script_name = strdup(req->request_uri);
    if (!req->script_name) {
        boa_perror(req, "unable to strdup req->request_uri for req->script_name");
        return 0;
    }

    if (c == '\0') {
        err = stat(pathname, &statbuf);
        if (err == -1) {
            send_r_not_found(req);
            return 0;
        }

        /* is it a dir? */
        if (!S_ISDIR(statbuf.st_mode)) {
            /* check access */
            /* the file must be readable+executable by at least
             * u,g,or o 
             */
            if (!S_ISREG(statbuf.st_mode) || access(pathname, R_OK|X_OK)) {
                send_r_forbidden(req);
                return 0;
            }
            /* stop here */
        } else {
            send_r_forbidden(req);
            return 0;
        }
    }

    /* we have path_info if c == '/'... still have to check for query */
    else if (c == '/') {
        unsigned int hash;
        alias *current;
        int path_len;

        req->path_info = strdup(pathname + i);
        if (!req->path_info) {
            boa_perror(req, "unable to strdup pathname + index for req->path_info");
            return 0;
        }
        pathname[i] = '\0'; /* strip path_info from path */
        path_len = strlen(req->path_info);
        /* we need to fix script_name here */
        /* index points into pathname, which is
         * realname/cginame/foo
         * and index points to the '/foo' part
         */
        req->script_name[strlen(req->script_name) - path_len] = '\0'; /* zap off the /foo part */

        /* now, we have to re-alias the extra path info....
           this sucks.
         */
        hash = get_alias_hash_value(req->path_info);
        current = alias_hashtable[hash];
        while (current && !req->path_translated) {
            if (!strncmp(req->path_info, current->fakename,
                         current->fake_len)) {
                static char buffer[MAX_HEADER_LENGTH + 1];

                if (current->real_len + path_len -
                    current->fake_len + 1 > sizeof(buffer)) {
                    log_error_doc(req);
                    fputs("uri too long!\n", stderr);
                    send_r_bad_request(req);
                    return 0;
                }

                memcpy(buffer, current->realname, current->real_len);
                /*
                strcpy(buffer + current->real_len,
                &req->path_info[current->fake_len]);
                */
                memcpy(buffer + current->real_len,
                       req->path_info + current->fake_len,
                       path_len - current->fake_len + 1); /* +1 for NUL */
                req->path_translated = strdup(buffer);
                if (!req->path_translated) {
                    boa_perror(req, "unable to strdup buffer for req->path_translated");
                    return 0;
                }
            }
            current = current->next;
        }
        /* no alias... try userdir */
        if (!req->path_translated && user_dir && req->path_info[1] == '~') {
            char *user_homedir;
            char *p;

            p = strchr(pathname + i + 1, '/');
            if (p)
                *p = '\0';

            user_homedir = get_home_dir(pathname + i + 2);
            if (p)
                *p = '/';

            if (!user_homedir) { /* no such user */
                send_r_not_found(req);
                return 0;
            }
            {
                unsigned int l1 = strlen(user_homedir);
                unsigned int l2 = strlen(user_dir);
                unsigned int l3 = 0;
                if (p)
                    l3 = strlen(p);

                req->path_translated = malloc(l1 + 1 + l2 + l3 + 1);
                if (req->path_translated == NULL) {
                    boa_perror(req, "unable to malloc memory for req->path_translated");
                    return 0;
                }
                memcpy(req->path_translated, user_homedir, l1);
                req->path_translated[l1] = '/';
                memcpy(req->path_translated + l1 + 1, user_dir, l2 + 1); /* copy the NUL just in case */
                if (p)
                    memcpy(req->path_translated + l1 + 1 + l2, p, l3 + 1);
            }
        } else if (!req->path_translated && document_root) {
            /* no userdir, no aliasing... try document root */
            unsigned int l1, l2;
            l1 = strlen(document_root);
            l2 = path_len;

            req->path_translated = malloc(l1 + l2 + 1);
            if (req->path_translated == NULL) {
                boa_perror(req, "unable to malloc memory for req->path_translated");
                return 0;
            }
            memcpy(req->path_translated, document_root, l1);
            memcpy(req->path_translated + l1, req->path_info, l2 + 1);
        }
    }

    req->pathname = strdup(pathname);
    if (!req->pathname) {
        boa_perror(req, "unable to strdup pathname for req->pathname");
        return 0;
    }

    return 1;
}

/*
 * Empties the alias hashtable, deallocating any allocated memory.
 */

void dump_alias(void)
{
    int i;
    alias *temp;

    for (i = 0; i < ALIAS_HASHTABLE_SIZE; ++i) { /* these limits OK? */
        if (alias_hashtable[i]) {
            temp = alias_hashtable[i];
            while (temp) {
                alias *temp_next;

                if (temp->fakename)
                    free(temp->fakename);
                if (temp->realname)
                    free(temp->realname);
                temp_next = temp->next;
                free(temp);
                temp = temp_next;
            }
            alias_hashtable[i] = NULL;
        }
    }
}