core : lib com ++
Philippe PITTOLI
commit
da51d3ef3d
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@ -0,0 +1,29 @@
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CC=gcc
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CFLAGS=-Wall -g
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LDFLAGS=
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CFILES=$(wildcard *.c) # CFILES => recompiles everything on a C file change
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EXEC=$(basename $(wildcard *.c))
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SOURCES=$(wildcard lib/*.c)
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OBJECTS=$(SOURCES:.c=.o)
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TESTS=$(addsuffix .test, $(EXEC))
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all: $(SOURCES) $(EXEC)
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$(EXEC): $(OBJECTS) $(CFILES)
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$(CC) $(CFLAGS) $(LDFLAGS) $(OBJECTS) $@.c -o $@
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.c.o:
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$(CC) -c $(CFLAGS) $< -o $@
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clean:
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-rm $(OBJECTS)
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mrproper: clean
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rm $(EXEC)
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# to test a binary "prog" : make prog.test
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$(TESTS):
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valgrind --leak-check=full -v --track-origins=yes ./$(basename $@)
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test: all $(TESTS)
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@ -0,0 +1,41 @@
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# connection init (draft)
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## what the programs should do and how they interact
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* service : application providing a feature to others (windows, audio, …)
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* program : specific application (browser, instant messaging, …)
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* <service> : service name
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* <index> : process index in the program point of view
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* <pindex> : process index in the service point of view
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1. the service creates a pipe, named /tmp/<service>
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2. the program creates pipes named /tmp/$pid-<index>-{in,out}
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3. the program prints in the pipe /tmp/<service> : $pid-<index> version
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4. depending on the configuration and service type, the service will
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* thread, to spare resources
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* fork, not to compromise the security
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5. the service prints <pindex> in /tmp/$pid-<index>-in
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## pure "networking" view (what should go in the pipes)
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1. the program prints in the pipe /tmp/<service> : $pid-<index> version
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2. the service prints <pindex> in /tmp/$pid-<index>-in
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# messages format
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QUESTION : no CBOR for 1 & 2, or CBOR everywhere ?
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## overview
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<type> : value
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<type> will be a simple byte :
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* <0 - 15> : control, meta data
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* <16 - 127> : later use
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* <128 - 255> : application specific (windowing system, audio system, …)
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## CBOR table (draft)
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index | semantic
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@ -0,0 +1,43 @@
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#include "lib/communication.h"
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/*
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* pipes creation and removal test program
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*
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* 1. to create the named pipe /tmp/<service>
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* 2. to create the named pipes in & out
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* 3. to remove the named pipes in & out
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* 4. to remove the named pipe /tmp/<service>
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*/
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int main(int argc, char * argv[])
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{
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// service path (/tmp/<service>)
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char spath[PATH_MAX];
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service_path (spath, "windows");
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int ret;
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if ((ret = service_create (spath))) {
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fprintf(stdout, "error service_create %d\n", ret);
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exit (1);
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}
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struct process proc;
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if ((ret = process_create (&proc, 0))) {
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fprintf(stdout, "error process_create %d\n", ret);
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exit (1);
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}
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/* specific code, talks between applications */
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if ((ret = process_destroy (&proc))) {
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fprintf(stdout, "error process_destroy %d\n", ret);
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exit (1);
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}
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if ((ret = service_close (spath))) {
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fprintf(stdout, "error service_close %d\n", ret);
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exit (1);
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}
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return EXIT_SUCCESS;
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}
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@ -0,0 +1,177 @@
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#include "communication.h"
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int service_path (char *buf, const char *sname)
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{
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if (buf == NULL) {
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return 1;
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}
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// already done in mkfifo
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if (strlen(TMPDIR) + strlen(sname) > PATH_MAX) {
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return 2;
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}
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bzero (buf, PATH_MAX);
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strncat (buf, TMPDIR, PATH_MAX);
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strncat (buf, sname, PATH_MAX);
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return 0;
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}
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void process_paths (char *in, char *out, pid_t pid, int index)
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{
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bzero (in, PATH_MAX);
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bzero (out, PATH_MAX);
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snprintf(in , PATH_MAX, "%s/%d-%d-in" , TMPDIR, pid, index);
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snprintf(out, PATH_MAX, "%s/%d-%d-out", TMPDIR, pid, index);
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}
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int service_create (const char *fifopath)
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{
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int ret;
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if ((ret = mkfifo (fifopath, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
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return 1;
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}
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return 0;
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}
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int service_close (const char *fifopath)
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{
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if (unlink (fifopath)) {
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return 1;
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}
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return 0;
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}
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void service_get_new_processes (struct process **proc, int *nproc, int sfifo)
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{
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char buf[BUFSIZ];
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bzero (buf, BUFSIZ);
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read (sfifo, buf, BUFSIZ);
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// TODO
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#if 0
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unsigned long long int val = strtoull(s, NULL, 10);
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char *token, *saveptr;
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char *str;
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int i, j;
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// printf("%d fields :: ", f->nbfields);
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// for( i = 0 ; i < f->nbfields ; i++) {
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// printf("%u, ", f->fields[i]);
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// }
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// printf("\n");
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for (str = s, i = 1; ; str = NULL, i++) {
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token = strtok_r(str, delim, &saveptr);
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if (token == NULL)
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break;
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// check if we need to print the current token humanized
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int found = 0;
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for (j = 0 ; j < f->nbfields && found == 0; j++ ) {
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if( i == f->fields[j] ) {
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print_token_to_human(token);
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found = 1;
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}
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}
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// print the current token not humanized
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if (found == 0) {
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printf("%s ", token);
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}
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}
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#endif
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}
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void gen_process_structure (struct process *p
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, pid_t pid, unsigned int index, unsigned int version)
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{
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p->pid = pid;
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p->version = version;
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p->index = index;
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}
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int process_create (struct process *p, int index)
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{
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pid_t pid = getpid();
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char fifopathin[PATH_MAX];
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char fifopathout[PATH_MAX];
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process_paths (fifopathin, fifopathout, pid, index);
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// creates the pipes
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int ret;
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if ((ret = mkfifo (fifopathin, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
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return 1;
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}
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if ((ret = mkfifo (fifopathout, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
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return 1;
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}
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// then creates the structure
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gen_process_structure (p, pid, index, COMMUNICATION_VERSION);
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return 0;
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}
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int process_destroy (struct process *p)
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{
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char fifopathin[PATH_MAX];
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char fifopathout[PATH_MAX];
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process_paths (fifopathin, fifopathout, p->pid, p->index);
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if (unlink (fifopathin)) {
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return 1;
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}
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if (unlink (fifopathout)) {
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return 1;
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}
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return 0;
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}
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int process_open (struct process *proc)
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{
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char fifopathin[PATH_MAX];
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char fifopathout[PATH_MAX];
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process_paths (fifopathin, fifopathout, proc->pid, proc->index);
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proc->in = open (fifopathin, S_IRUSR);
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proc->out = open (fifopathout, S_IRUSR);
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return 0;
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}
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int process_close (struct process *proc)
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{
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if (proc->in != 0) {
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close (proc->in);
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proc->in = 0;
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}
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if (proc->out != 0) {
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close (proc->out);
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proc->out = 0;
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}
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return 0;
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}
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int process_read (struct process *proc, void * buf, size_t * msize)
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{
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return 0;
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}
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int process_write (struct process *proc, void * buf, size_t msize)
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{
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return 0;
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}
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#ifndef __COMMUNICATION_H__
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#define __COMMUNICATION_H__
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h> // unlink
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#include <sys/types.h> // mkfifo
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#include <sys/stat.h> // mkfifo
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#include <fcntl.h> // open
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#define TMPDIR "/tmp/"
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#define COMMUNICATION_VERSION 1
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// TODO to check the right length for a path
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#define PATH_MAX BUFSIZ
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struct process {
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pid_t pid;
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unsigned int version;
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unsigned int index;
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int in, out;
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};
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// TODO create the service process structure
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int service_path (char *buf, const char *sname);
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void gen_process_structure (struct process *p
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, pid_t pid, unsigned int index, unsigned int version);
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/*
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* returns
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* 0 : ok
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* 1 : no service name
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* 2 : service name too long
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* 3 : unable to create fifo
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*/
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int service_create (const char *sname);
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int service_close (const char *sname);
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void service_get_new_processes (struct process **, int *nproc, int sfifo);
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int process_create (struct process *, int index); // called by the application
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int process_destroy (struct process *); // called by the application
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int process_open (struct process *); // called by the service & application
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int process_close (struct process *); // called by the service & application
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int process_read (struct process *, void * buf, size_t *);
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int process_write (struct process *, void * buf, size_t);
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#endif
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@ -0,0 +1,89 @@
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#include "lib/communication.h"
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/*
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* main loop
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*
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* opens the application pipes,
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* reads then writes the same message,
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* then closes the pipes
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*/
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void main_loop (const char *spath)
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{
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int ret;
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int sfifo = open (spath, S_IRUSR); // opens the service named pipe
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struct process *proc;
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int nproc = 0;
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do {
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service_get_new_processes (&proc, &nproc, sfifo);
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// for each process : open, read, write, close
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for (int i = 0 ; i < nproc ; i++) {
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printf ("new connected process : %d, version %d, index %d\n"
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, proc[i].pid, proc[i].version, proc[i].index);
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if ((ret = process_open (&proc[i]))) {
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fprintf(stdout, "error process_create %d\n", ret);
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exit (1);
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}
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// about the message
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size_t msize;
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char *buf;
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if ((ret = process_read (&proc[i], &buf, &msize))) {
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fprintf(stdout, "error process_read %d\n", ret);
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exit (1);
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}
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if ((ret = process_write (&proc[i], &buf, msize))) {
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fprintf(stdout, "error process_read %d\n", ret);
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exit (1);
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}
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if ((ret = process_close (&proc[i]))) {
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fprintf(stdout, "error process_destroy %d\n", ret);
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exit (1);
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}
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}
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} while (0); // it's a test, we only do it once
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close (sfifo); // closes the service named pipe
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}
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/*
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* service test
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*
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* 1. creates the named pipe /tmp/<service>, then listens
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* 2. opens the named pipes in & out
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* 3. talks with the (test) program
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* 4. closes the test program named pipes
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* 5. removes the named pipe /tmp/<service>
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*/
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int main(int argc, char * argv[])
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{
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// gets the service path, such as /tmp/<service>
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char spath[PATH_MAX];
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service_path (spath, "windows");
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// creates the service named pipe, that listens to client applications
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int ret;
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if ((ret = service_create (spath))) {
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fprintf(stdout, "error service_create %d\n", ret);
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exit (1);
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}
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// the service will loop until the end of time, a specific message, a signal
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main_loop (spath);
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// the application will shut down, and remove the service named pipe
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if ((ret = service_close ("windows"))) {
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fprintf(stdout, "error service_close %d\n", ret);
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exit (1);
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}
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return EXIT_SUCCESS;
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}
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