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@@ -1,11 +1,31 @@
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/*
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* $Id$
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*
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- * simple UAC for things such as SUBSCRIBE or SMS gateway;
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- * no authentication and other UAC features -- just send
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- * a message, retransmit and await a reply; forking is not
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- * supported during client generation, in all other places
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- * it is -- adding it should be simple
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+ * Fifo server is a very powerful tool used to access easily
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+ * ser's internals via textual interface, similarly to
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+ * how internals of many operating systems are accessible
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+ * via the proc file system. This might be used for
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+ * making ser do things for you (such as initiating new
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+ * transaction from webpages) or inspect server's health.
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+ *
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+ * FIFO server allows new functionality to be registered
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+ * with it -- thats what register_fifo_cmd is good for.
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+ * Remember, the initialization must take place before
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+ * forking; best in init_module functions. When a function
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+ * is registered, it can be always evoked by sending its
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+ * name prefixed by colon to the FIFO.
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+ *
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+ * There are few commands already implemented in core.
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+ * These are 'uptime' for looking at how long the server
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+ * is alive and 'print' for debugging purposes.
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+ *
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+ * Every command sent to FIFO must be sent atomically to
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+ * avoid intermixing with other commands and MUST be
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+ * terminated by empty line so that the server is to able
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+ * to find its end if it does not understand the command.
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+ *
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+ * File test/transaction.fifo illustrates example of use
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+ * of t_uac command (part of TM module).
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*/
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#include <stdlib.h>
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@@ -29,7 +49,8 @@
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/* FIFO server vars */
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char *fifo=0; /* FIFO name */
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-int fifo_mode=S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
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+int fifo_mode=S_IRUSR | S_IWUSR | S_IRGRP |
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+ S_IWGRP | S_IROTH | S_IWOTH;
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pid_t fifo_pid;
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/* file descriptors */
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static int fifo_read=0;
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@@ -136,7 +157,8 @@ int read_eol( FILE *stream )
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}
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return 1;
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}
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-
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+
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+/* read from input until empty line is encountered */
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int read_line_set(char *buf, int max_len, FILE *fifo, int *len)
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{
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int set_len;
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@@ -164,6 +186,34 @@ int read_line_set(char *buf, int max_len, FILE *fifo, int *len)
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}
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}
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+/* read from input until line with only dot in it is encountered */
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+int read_body(char *buf, int max_len, FILE *fifo, int *len)
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+{
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+ int set_len;
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+ char *c;
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+ int line_len;
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+
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+ c=buf;set_len=0;
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+ while(1) {
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+ if (!read_line(c,max_len,fifo,&line_len)) {
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+ LOG(L_ERR, "ERROR: fifo_server: line expected\n");
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+ return 0;
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+ }
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+ /* end encountered ... return */
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+ if (line_len==1 && *c=='.') {
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+ *len=set_len;
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+ return 1;
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+ }
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+ max_len-=line_len; c+=line_len; set_len+=line_len;
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+ if (max_len<CRLF_LEN) {
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+ LOG(L_ERR, "ERROR: fifo_server: no place for CRLF\n");
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+ return 0;
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+ }
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+ memcpy(c, CRLF, CRLF_LEN);
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+ max_len-=CRLF_LEN; c+=CRLF_LEN; set_len+=CRLF_LEN;
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+ }
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+}
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+
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static char *trim_filename( char * file )
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{
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int prefix_len, fn_len;
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@@ -311,10 +361,12 @@ int open_fifo_server()
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}
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DBG("TM: open_uac_fifo: opening fifo...\n");
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if ((mkfifo(fifo, fifo_mode)<0) && (errno!=EEXIST)) {
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- LOG(L_ERR, "ERROR: open_fifo_server; can't create FIFO: %s\n",
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- strerror(errno));
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+ LOG(L_ERR, "ERROR: open_fifo_server; can't create FIFO: "
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+ "%s (mode=%d)\n",
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+ strerror(errno), fifo_mode);
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return -1;
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- }
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+ }
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+ DBG("DEBUG: fifo %s opened, mode=%d\n", fifo, fifo_mode );
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time(&up_since);
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process_no++;
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fifo_pid=fork();
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Jiri Kuthan