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<https://www.gnu.org/licenses/why-not-lgpl.html>.

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CC?=gcc
CFLAGS:=-Wall -Werror -Wextra -I.
OBJ=build/femtotcp.o build/test-linux.o
all: build/test
#Static library
static: CFLAGS+=-static
static: libtcpip.a
libtcpip.a: $(OBJ)
@ar rcs $@ $^
clean:
@rm -f build/*
@make -C test/unit clean
# Test
asan: build/test
asan:CFLAGS+=-fsanitize=address
asan:LDFLAGS+=-static-libasan
build/test:CFLAGS+=-g -ggdb -DTEST_MAIN -DETHERNET
build/test:LDFLAGS+=-pthread
build/test: $(OBJ)
@echo "Linking $@"
@$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJ)
build/test-linux.o: test/test-linux.c
@echo "Compiling $<"
@$(CC) $(CFLAGS) -c $< -o $@
build/%.o: src/%.c
@echo "Compiling $<"
@$(CC) $(CFLAGS) -c $< -o $@
unit:
@make -C test/unit
.PHONY: clean all static

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# FemtoTCP
The smallest TCP/IP stack on the planet
## Description and project goals
FemtoTCP is a TCP/IP stack with no dynamic memory allocations, designed to be
used in resource-constrained embedded systems.
Endpoint only mode is supported, which means that femtotcp can be used to
establish network connections but it does not route traffic between different
network interfaces.
A single network interface can be associated with the device.
## Features supported
- ARP (RFC 826)
- IPv4 (RFC 791)
- ICMP (RFC 792): only ping replies
- DHCP (RFC 2131): client only
- UDP (RFC 768): unicast only
- TCP (RFC 793)
- TCP options supported: Timestamps, Maximum Segment Size
- BSD-like, non blocking socket API, with custom callbacks
- No dynamic memory allocation
## Copyright and License
FemtoTCP is licensed under the GPLv3 license. See the LICENSE file for details.
Copyright (c) 2024 Daniele Lacamera. Some rights reserved.

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#ifndef QUECTONET_H
#define QUECTONET_H
#include <stdint.h>
/* Types */
struct ipstack;
typedef uint32_t ip4;
/* Macros, compiler specific. */
#define PACKED __attribute__((packed))
#define ee16(x) __builtin_bswap16(x)
#define ee32(x) __builtin_bswap32(x)
#define DEBUG
#ifdef DEBUG
#include <stdio.h>
#define LOG(fmt, ...) printf(fmt, ##__VA_ARGS__)
#else
#define LOG(fmt, ...) do{}while(0)
#endif
/* Device driver interface */
/* Struct to contain a hw device description */
struct ll {
uint8_t mac[6];
uint8_t ifname[16];
/* poll function */
int (*poll)(struct ll *ll, void *buf, int len);
/* send function */
int (*send)(struct ll *ll, void *buf, int len);
};
/* Struct to contain an IP device configuration */
struct ipconf {
struct ll *ll;
ip4 ip;
ip4 mask;
ip4 gw;
};
/* Socket interface */
#ifndef NATIVE_POSIX_SOCKET
#define IPSTACK_SOCK_STREAM 1
#define IPSTACK_SOCK_DGRAM 2
struct ipstack_sockaddr_in {
uint16_t sin_family;
uint16_t sin_port;
struct sin_addr { uint32_t s_addr; } sin_addr;
};
struct ipstack_sockaddr { uint16_t sa_family; };
typedef uint32_t socklen_t;
#ifndef AF_INET
#define AF_INET 2
#endif
#endif
int posix_socket(struct ipstack *s, int domain, int type, int protocol);
int posix_bind(struct ipstack *s, int sockfd, const struct ipstack_sockaddr *addr, socklen_t addrlen);
int posix_listen(struct ipstack *s, int sockfd, int backlog);
int posix_accept(struct ipstack *s, int sockfd, struct ipstack_sockaddr *addr, socklen_t *addrlen);
int posix_connect(struct ipstack *s, int sockfd, const struct ipstack_sockaddr *addr, socklen_t addrlen);
int posix_sendto(struct ipstack *s, int sockfd, const void *buf, size_t len, int flags, const struct ipstack_sockaddr *dest_addr, socklen_t addrlen);
int posix_recvfrom(struct ipstack *s, int sockfd, void *buf, size_t len, int flags, struct ipstack_sockaddr *src_addr, socklen_t *addrlen);
int posix_close(struct ipstack *s, int sockfd);
int posix_getpeername(struct ipstack *s, int sockfd, struct ipstack_sockaddr *addr, socklen_t *addrlen);
int posix_getsockname(struct ipstack *s, int sockfd, struct ipstack_sockaddr *addr, socklen_t *addrlen);
int dhcp_client_init(struct ipstack *s);
int dhcp_bound(struct ipstack *s);
/* IP stack interface */
void ipstack_init(struct ipstack *s);
void ipstack_init_static(struct ipstack **s);
int ipstack_poll(struct ipstack *s, uint64_t now);
void ipstack_ipconfig_set(struct ipstack *s, ip4 ip, ip4 mask, ip4 gw);
void ipstack_ipconfig_get(struct ipstack *s, ip4 *ip, ip4 *mask, ip4 *gw);
struct ll *ipstack_getdev(struct ipstack *s);
ip4 atoip4(const char *ip);
#endif

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#include <net/if.h>
#include <stdio.h>
/* tap device */
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/if_tun.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/poll.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <stdlib.h>
#include "femtotcp.h"
static int tap_fd;
//#define DHCP
#define FEMTOTCP_IP "10.10.10.2"
#define LINUX_IP "10.10.10.1"
#define TEST_SIZE (8 * 1024)
void print_buffer(uint8_t *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
if (i % 16 == 0)
printf("\n");
printf("%02x ", buf[i]);
}
printf("\n");
}
int tap_poll(struct ll *ll, void *buf, int len)
{
struct pollfd pfd;
(void)ll;
int ret;
pfd.fd = tap_fd;
pfd.events = POLLIN;
ret = poll(&pfd, 1, 2);
if (ret < 0) {
perror("poll");
return -1;
}
if (ret == 0) {
return 0;
}
return read(tap_fd, buf, len);
}
int tap_send(struct ll *ll, void *buf, int len)
{
(void)ll;
//print_buffer(buf, len);
return write(tap_fd, buf, len);
}
int tap_init(struct ll *ll, const char *ifname)
{
struct ifreq ifr;
struct sockaddr_in *addr;
int sock_fd;
if ((tap_fd = open("/dev/net/tun", O_RDWR)) < 0) {
perror("accessing /dev/net/tun");
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(tap_fd, TUNSETIFF, (void *)&ifr) < 0) {
perror("ioctl TUNSETIFF");
close(tap_fd);
return -1;
}
/* Get mac address */
if (ioctl(tap_fd, SIOCGIFHWADDR, &ifr) < 0) {
perror("ioctl SIOCGIFHWADDR");
close(tap_fd);
return -1;
}
memcpy(ll->mac, ifr.ifr_hwaddr.sa_data, 6);
ll->mac[5] ^= 1;
ll->poll = tap_poll;
ll->send = tap_send;
/* Set up network side */
sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (sock_fd < 0) {
perror("socket");
close(tap_fd);
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sock_fd, SIOCGIFFLAGS, &ifr) < 0) {
perror("ioctl SIOCGIFFLAGS");
close(sock_fd);
return -1;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(sock_fd, SIOCSIFFLAGS, &ifr) < 0) {
perror("ioctl SIOCSIFFLAGS");
close(sock_fd);
return -1;
}
addr = (struct sockaddr_in *)&ifr.ifr_addr;
addr->sin_family = AF_INET;
inet_pton(AF_INET, LINUX_IP, &addr->sin_addr);
if (ioctl(sock_fd, SIOCSIFADDR, &ifr) < 0) {
perror("ioctl SIOCSIFADDR");
close(sock_fd);
return -1;
}
inet_pton(AF_INET, "255.255.255.0", &addr->sin_addr);
if (ioctl(sock_fd, SIOCSIFNETMASK, &ifr) < 0) {
perror("ioctl SIOCSIFNETMASK");
close(sock_fd);
return -1;
}
if (ioctl(sock_fd, SIOCGIFFLAGS, &ifr) < 0) {
perror("ioctl SIOCGIFFLAGS");
close(sock_fd);
return -1;
}
ifr.ifr_flags = IFF_UP | IFF_RUNNING;
if (ioctl(sock_fd, SIOCSIFFLAGS, &ifr) < 0) {
perror("ioctl SIOCSIFFLAGS");
close(sock_fd);
return -1;
}
printf("Successfully initialized tap device %s\n", ifname);
return 0;
}
#include <sys/random.h>
uint32_t ipstack_getrandom(void)
{
uint32_t ret;
getrandom(&ret, sizeof(ret), 0);
return ret;
}
#define BUFFER_SIZE TEST_SIZE
static int test_echoserver_closewait(struct ipstack *s)
{
int fd, ret;
int client_fd = -1;
int tot_sent = 0;
int exit_ok = 0, exit_count = 0;
struct ipstack_sockaddr_in local_sock = {
.sin_family = AF_INET,
.sin_port = ee16(8), /* Echo */
.sin_addr.s_addr = 0
};
fd = posix_socket(s, AF_INET, IPSTACK_SOCK_STREAM, 0);
printf("socket: %04x\n", fd);
ret = posix_bind(s, fd, (struct ipstack_sockaddr *)&local_sock, sizeof(local_sock));
printf("bind: %d\n", ret);
ret = posix_listen(s, fd, 1);
printf("listen: %d\n", ret);
while(1) {
uint32_t ms_next;
uint8_t buf[BUFFER_SIZE];
struct timeval tv;
gettimeofday(&tv, NULL);
ms_next = ipstack_poll(s, tv.tv_sec * 1000 + tv.tv_usec / 1000);
usleep(ms_next * 1000);
if (exit_ok > 0) {
if (exit_count++ < 10)
continue;
else break;
}
if (client_fd < 0) {
client_fd = posix_accept(s, fd, NULL, NULL);
if (client_fd > 0) {
printf("accept: %04x\n", client_fd);
}
} else {
if (ret <= 0) {
ret = posix_recvfrom(s, client_fd, buf, sizeof(buf), 0, NULL, NULL);
if (ret == -11)
continue; /* Call again */
if (ret < 0) {
printf("Recv error: %d\n", ret);
posix_close(s, client_fd);
return -1;
} else if (ret == 0) {
printf("Client side closed the connection.\n");
posix_close(s, client_fd);
client_fd = -1;
printf("Server: Exiting.\n");
exit_ok = 1;
continue;
} else if (ret > 0) {
printf("recv: %d, echoing back\n", ret);
}
}
if (ret > 0) {
int snd_ret;
snd_ret = posix_sendto(s, client_fd, buf + tot_sent, ret - tot_sent, 0, NULL, 0);
if (snd_ret == -11)
continue; /* Call again */
if (snd_ret < 0) {
printf("Send error: %d\n", snd_ret);
posix_close(s, client_fd);
return 0;
}
tot_sent += snd_ret;
printf("sent %d bytes\n", snd_ret);
if (ret == tot_sent) {
tot_sent = 0;
ret = 0;
}
}
}
}
return 0;
}
static void *pt_echoclient_closing(void *arg)
{
int fd, ret;
unsigned total_r = 0;
unsigned i;
uint8_t buf[BUFFER_SIZE];
uint8_t test_pattern[16] = "Test pattern - -";
uint32_t *srv_addr = (uint32_t *)arg;
struct sockaddr_in remote_sock = {
.sin_family = AF_INET,
.sin_port = ntohs(8), /* Echo */
};
remote_sock.sin_addr.s_addr = *srv_addr;
fd = socket(AF_INET, IPSTACK_SOCK_STREAM, 0);
if (fd < 0) {
printf("test client socket: %d\n", fd);
return (void *)-1;
}
sleep(1);
printf("Connecting to echo server\n");
ret = connect(fd, (struct sockaddr *)&remote_sock, sizeof(remote_sock));
if (ret < 0) {
printf("test client connect: %d\n", ret);
perror("connect");
return (void *)-1;
}
for (i = 0; i < sizeof(buf); i += sizeof(test_pattern)) {
memcpy(buf + i, test_pattern, sizeof(test_pattern));
}
ret = write(fd, buf, sizeof(buf));
if (ret < 0) {
printf("test client write: %d\n", ret);
return (void *)-1;
}
while (total_r < sizeof(buf)) {
ret = read(fd, buf + total_r, sizeof(buf) - total_r);
if (ret < 0) {
printf("failed test client read: %d\n", ret);
return (void *)-1;
}
if (ret == 0) {
printf("test client read: server has closed the connection.\n");
return (void *)-1;
}
total_r += ret;
}
for (i = 0; i < sizeof(buf); i += sizeof(test_pattern)) {
if (memcmp(buf + i, test_pattern, sizeof(test_pattern))) {
printf("test client: pattern mismatch\n");
printf("at position %d\n", i);
buf[i + 16] = 0;
printf("%s\n", &buf[i]);
return (void *)-1;
}
}
close(fd);
printf("Test client: success\n");
return (void *)0;
}
int main(int argc, char **argv)
{
struct ipstack *s;
struct ll *tapdev;
pthread_t pt;
struct timeval tv;
ip4 ip = 0, nm = 0, gw = 0;
uint32_t srv_ip;
int ret, test_ret;
(void)argc;
(void)argv;
(void)ip;
(void)nm;
(void)gw;
(void)tv;
ipstack_init_static(&s);
tapdev = ipstack_getdev(s);
if (!tapdev)
return 1;
if (tap_init(tapdev, "femt0") < 0) {
perror("tap init");
return 2;
}
system("tcpdump -i femt0 -w test.pcap &");
sleep(1);
#ifdef DHCP
gettimeofday(&tv, NULL);
ipstack_poll(s, tv.tv_sec * 1000 + tv.tv_usec / 1000);
dhcp_client_init(s);
do {
gettimeofday(&tv, NULL);
ipstack_poll(s, tv.tv_sec * 1000 + tv.tv_usec / 1000);
usleep(1000);
ipstack_ipconfig_get(s, &ip, &nm, &gw);
} while (!dhcp_bound(s));
printf("DHCP: obtained IP address.\n");
ipstack_ipconfig_get(s, &ip, &nm, &gw);
srv_ip = htonl(ip);
#else
ipstack_ipconfig_set(s, atoip4(FEMTOTCP_IP), atoip4("255.255.255.0"),
atoip4(LINUX_IP));
printf("IP: manually configured\n");
inet_pton(AF_INET, FEMTOTCP_IP, &srv_ip);
#endif
pthread_create(&pt, NULL, pt_echoclient_closing, &srv_ip);
printf("Starting test: echo server close-wait\n");
ret = test_echoserver_closewait(s);
pthread_join(pt, (void **)&test_ret);
printf("Test echo server close-wait: %d\n", ret);
printf("Test linux client: %d\n", test_ret);
sleep(1);
system("killall tcpdump");
return 0;
}

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LDFLAGS=-lcheck -lm -lpthread -lrt -ldl -lsubunit
CFLAGS=-g -Wall -Wextra -Werror -I../../ -DETHERNET
CC=gcc
all: unit
unit: unit.o
$(CC) -o $@ $^ $(LDFLAGS)
%.o: %.c
$(CC) $(CFLAGS) -c $<
clean:
rm -f *.o unit

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#include "check.h"
#include "../../src/femtotcp.c"
#include <stdlib.h> /* for random() */
/* pseudo random number generator to mock the random number generator */
uint32_t ipstack_getrandom(void)
{
unsigned int seed = 0xDAC0FFEE;
srandom(seed);
return random();
}
uint8_t mem[8 * 1024];
uint32_t memsz = 8 * 1024;
START_TEST(test_fifo_init)
{
struct fifo f;
fifo_init(&f, mem, memsz);
ck_assert_int_eq(fifo_len(&f), 0);
ck_assert_int_eq(fifo_space(&f), memsz);
ck_assert_int_eq(fifo_len(&f), 0);
}
END_TEST
START_TEST(test_fifo_push_and_pop) {
struct fifo f;
struct pkt_desc *desc, *desc2;
uint8_t data[] = {1, 2, 3, 4, 5};
fifo_init(&f, mem, memsz);
ck_assert_int_eq(fifo_space(&f), memsz);
// Test push
ck_assert_int_eq(fifo_push(&f, data, sizeof(data)), 0);
// Test peek
desc = fifo_peek(&f);
ck_assert_ptr_nonnull(desc);
ck_assert_int_eq(desc->len, sizeof(data));
ck_assert_mem_eq(f.data + desc->pos + sizeof(struct pkt_desc), data, sizeof(data));
desc2 = fifo_peek(&f);
ck_assert_ptr_nonnull(desc2);
ck_assert_ptr_eq(desc, desc2);
ck_assert_int_eq(fifo_len(&f), desc->len + sizeof(struct pkt_desc));
// Test pop
desc = fifo_pop(&f);
ck_assert_int_eq(fifo_space(&f), memsz);
ck_assert_ptr_nonnull(desc);
ck_assert_int_eq(desc->len, sizeof(data));
ck_assert_mem_eq(f.data + desc->pos + sizeof(struct pkt_desc), data, sizeof(data));
ck_assert_int_eq(fifo_len(&f), 0);
}
END_TEST
START_TEST(test_fifo_push_and_pop_multiple) {
struct fifo f;
uint8_t data[] = {1, 2, 3, 4, 5};
uint8_t data2[] = {6, 7, 8, 9, 10};
fifo_init(&f, mem, memsz);
ck_assert_int_eq(fifo_space(&f), memsz);
// Test push
ck_assert_int_eq(fifo_push(&f, data, sizeof(data)), 0);
ck_assert_int_eq(fifo_len(&f), sizeof(data) + sizeof(struct pkt_desc));
ck_assert_int_eq(fifo_space(&f), f.size - (sizeof(data) + sizeof(struct pkt_desc)));
ck_assert_int_eq(fifo_push(&f, data2, sizeof(data2)), 0);
// Test pop
struct pkt_desc *desc = fifo_pop(&f);
ck_assert_ptr_nonnull(desc);
ck_assert_int_eq(desc->len, sizeof(data));
ck_assert_mem_eq(f.data + desc->pos + sizeof(struct pkt_desc), data, sizeof(data));
desc = fifo_pop(&f);
ck_assert_ptr_nonnull(desc);
ck_assert_int_eq(desc->len, sizeof(data2));
ck_assert_mem_eq(f.data + desc->pos + sizeof(struct pkt_desc), data2, sizeof(data2));
}
END_TEST
START_TEST(test_fifo_pop_success) {
struct fifo f;
uint8_t data[] = {1, 2, 3, 4};
fifo_init(&f, mem, memsz);
fifo_push(&f, data, sizeof(data)); // Add data to FIFO
struct pkt_desc *desc = fifo_pop(&f);
ck_assert_ptr_nonnull(desc); // Ensure we got a valid descriptor
ck_assert_int_eq(desc->len, sizeof(data)); // Check length
ck_assert_mem_eq(f.data + desc->pos + sizeof(struct pkt_desc), data, sizeof(data)); // Check data
}
START_TEST(test_fifo_pop_empty) {
struct fifo f;
fifo_init(&f, mem, memsz);
struct pkt_desc *desc = fifo_pop(&f);
ck_assert_ptr_eq(desc, NULL); // Ensure pop returns NULL on empty FIFO
}
START_TEST(test_fifo_push_full) {
struct fifo f;
uint8_t data[8 * 1024] = {1, 2, 3, 4};
int ret;
fifo_init(&f, mem, memsz);
fifo_push(&f, data, sizeof(data)); // Add data to FIFO
ret = fifo_push(&f, data, sizeof(data));
ck_assert_int_eq(ret, -1); // Ensure push returns -1 when FIFO is full
}
END_TEST
START_TEST(test_fifo_push_wrap) {
struct fifo f;
uint8_t buffer[100];
uint8_t data[] = {1, 2, 3, 4};
int ret;
fifo_init(&f, buffer, sizeof(buffer));
fifo_push(&f, data, sizeof(data)); // Add data to FIFO
// Pop the data to make space
struct pkt_desc *desc = fifo_pop(&f);
ck_assert_ptr_nonnull(desc);
// Push data to wrap around the buffer
ret = fifo_push(&f, data, sizeof(data));
ck_assert_int_eq(ret, 0);
ck_assert_int_eq(desc->len, sizeof(data));
ck_assert_mem_eq(f.data + desc->pos + sizeof(struct pkt_desc), data, sizeof(data));
}
END_TEST
START_TEST(test_fifo_push_wrap_multiple) {
struct fifo f;
uint8_t data[] = {1, 2, 3, 4};
uint8_t data2[] = {5, 6, 7, 8, 9};
int ret;
fifo_init(&f, mem, memsz);
fifo_push(&f, data, sizeof(data)); // Add data to FIFO
// Pop the data to make space
struct pkt_desc *desc = fifo_pop(&f);
ck_assert_ptr_nonnull(desc);
// Push data to wrap around the buffer
ret = fifo_push(&f, data, sizeof(data));
ck_assert_int_eq(ret, 0);
ck_assert_int_eq(desc->len, sizeof(data));
ck_assert_mem_eq(f.data + desc->pos + sizeof(struct pkt_desc), data, sizeof(data));
// Push more data to wrap around the buffer
ret = fifo_push(&f, data2, sizeof(data2));
ck_assert_int_eq(ret, 0);
ck_assert_int_eq(fifo_len(&f), sizeof(data2) + sizeof(data) + 2 * sizeof(struct pkt_desc));
}
END_TEST
START_TEST(test_fifo_next_success) {
struct fifo f;
uint8_t data1[] = {1, 2, 3, 4};
uint8_t data2[] = {5, 6, 7, 8, 9};
fifo_init(&f, mem, memsz);
// Add two packets to the FIFO
fifo_push(&f, data1, sizeof(data1));
fifo_push(&f, data2, sizeof(data2));
ck_assert_int_eq(fifo_len(&f), sizeof(data1) + sizeof(data2) + 2 * sizeof(struct pkt_desc));
// Get the first packet descriptor
struct pkt_desc *desc = fifo_peek(&f);
ck_assert_ptr_nonnull(desc);
// Get the next packet descriptor using fifo_next
struct pkt_desc *next_desc = fifo_next(&f, desc);
ck_assert_ptr_nonnull(next_desc); // Ensure next descriptor is valid
ck_assert_int_eq(next_desc->len, sizeof(data2)); // Check length of next packet
}
START_TEST(test_fifo_next_empty_fifo) {
struct fifo f;
fifo_init(&f, mem, memsz);
// Start with an empty FIFO
struct pkt_desc *desc = NULL;
struct pkt_desc *next_desc = fifo_next(&f, desc);
ck_assert_ptr_eq(next_desc, NULL); // Ensure next returns NULL on empty FIFO
}
START_TEST(test_fifo_next_end_of_fifo) {
struct fifo f;
uint8_t data[] = {1, 2, 3, 4};
fifo_init(&f, mem, memsz);
fifo_push(&f, data, sizeof(data));
struct pkt_desc *desc = fifo_peek(&f); // Get first packet
fifo_pop(&f); // Simulate removing the packet
struct pkt_desc *next_desc = fifo_next(&f, desc);
ck_assert_ptr_eq(next_desc, NULL); // Should return NULL as there are no more packets
}
END_TEST
START_TEST(test_queue_init) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
ck_assert_int_eq(q.size, memsz);
ck_assert_ptr_eq(q.data, mem);
ck_assert_int_eq(q.head, 0);
ck_assert_int_eq(q.tail, 0);
ck_assert_int_eq(q.seq_base, 0x12345678);
}
END_TEST
START_TEST(test_queue_space_empty) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
ck_assert_int_eq(queue_space(&q), memsz); // Full space should be available
}
END_TEST
START_TEST(test_queue_len_empty) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
ck_assert_int_eq(queue_len(&q), 0); // No bytes should be in use
}
END_TEST
START_TEST(test_queue_partial_fill) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
q.head = 256; // Simulate adding 256 bytes of data
ck_assert_int_eq(queue_space(&q), memsz - 256);
ck_assert_int_eq(queue_len(&q), 256);
}
END_TEST
START_TEST(test_queue_wrap_around) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
q.head = 800;
q.tail = 200; // Head has wrapped around, so 600 bytes are filled
ck_assert_int_eq(queue_space(&q), q.size - 600);
ck_assert_int_eq(queue_len(&q), 600); // 600 bytes filled
}
END_TEST
START_TEST(test_queue_insert_empty) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
uint8_t data[] = {1, 2, 3, 4};
int res = queue_insert(&q, data, 0, sizeof(data));
ck_assert_int_eq(res, 0);
ck_assert_int_eq(queue_len(&q), sizeof(data));
ck_assert_int_eq(q.head, sizeof(data));
ck_assert_mem_eq(q.data, data, sizeof(data));
}
END_TEST
START_TEST(test_queue_insert_sequential) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
uint8_t data1[] = {1, 2};
uint8_t data2[] = {3, 4};
int res1 = queue_insert(&q, data1, 0, sizeof(data1));
int res2 = queue_insert(&q, data2, 2, sizeof(data2));
ck_assert_int_eq(res1, 0);
ck_assert_int_eq(res2, 0);
ck_assert_int_eq(queue_len(&q), sizeof(data1) + sizeof(data2));
ck_assert_mem_eq(q.data, data1, sizeof(data1));
ck_assert_mem_eq(q.data + 2, data2, sizeof(data2));
}
END_TEST
START_TEST(test_queue_pop) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
uint8_t data[] = {5, 6, 7, 8};
uint8_t out[4];
queue_insert(&q, data, 0, sizeof(data));
int len = queue_pop(&q, out, sizeof(out));
ck_assert_int_eq(len, sizeof(out));
ck_assert_mem_eq(out, data, sizeof(data));
ck_assert_int_eq(queue_len(&q), 0);
ck_assert_int_eq(q.tail, 4);
}
END_TEST
START_TEST(test_queue_pop_wraparound) {
struct queue q;
queue_init(&q, mem, memsz, 0x12345678);
uint8_t data[] = {9, 10, 11, 12};
uint8_t out[4];
q.head = memsz - 1;
q.tail = memsz - 1;
queue_insert(&q, data, 0, sizeof(data));
int len = queue_pop(&q, out, sizeof(out));
ck_assert_int_eq(len, sizeof(out));
ck_assert_mem_eq(out, data, sizeof(data));
ck_assert_int_eq(queue_len(&q), 0);
}
END_TEST
Suite *femto_suite(void)
{
Suite *s;
TCase *tc_core, *tc_proto;
s = suite_create("FemtoTCP");
tc_core = tcase_create("Core");
tc_proto = tcase_create("Protocols");
tcase_add_test(tc_core, test_fifo_init);
suite_add_tcase(s, tc_core);
suite_add_tcase(s, tc_proto);
tcase_add_test(tc_core, test_fifo_push_and_pop);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_push_and_pop_multiple);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_pop_success);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_pop_empty);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_push_full);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_push_wrap);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_push_wrap_multiple);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_next_success);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_next_empty_fifo);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_fifo_next_end_of_fifo);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_init);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_space_empty);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_len_empty);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_partial_fill);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_wrap_around);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_insert_empty);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_insert_sequential);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_pop);
suite_add_tcase(s, tc_core);
tcase_add_test(tc_core, test_queue_pop_wraparound);
suite_add_tcase(s, tc_core);
return s;
}
int main(void)
{
int n_fail = 0;
Suite *s;
SRunner *sr;
s = femto_suite();
sr = srunner_create(s);
srunner_run_all(sr, CK_NORMAL);
n_fail = srunner_ntests_failed(sr);
srunner_free(sr);
return (n_fail == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}