/src/uWebSockets/fuzzing/TopicTree.cpp

Source
#define WIN32_EXPORT

#include "helpers.h"

/* Test for the topic tree */
#include "../src/TopicTree.h"

#include <memory>

// std::vector<std::string_view> topics = {"", "one", "two", "three"};

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
    /* Create topic tree */
    uWS::TopicTree<std::string, std::string_view> topicTree([](uWS::Subscriber *s, std::string &message, auto flags) {

        /* Depending on what publishing we do below (with or without empty strings),
         * this assumption can hold true or not. For now it should hold true */
        if (!message.length()) {
            free((void *) -1);
        }

        /* Break if we have no subscriptions (not really an error, just to bring more randomness) */
        if (s->topics.size() == 0) {
            return true;
        }

        /* Success */
        return false;
    });

    /* Holder for all manually allocated subscribers */
    std::map<uint32_t, uWS::Subscriber *> subscribers;

    /* Iterate the padded fuzz as chunks */
    makeChunked(makePadded(data, size), size, [&topicTree, &subscribers](const uint8_t *data, size_t size) {
        /* We need at least 5 bytes */
        if (size > 4) {
            /* Last of all is a string */
            std::string_view lastString((char *) data + 5, size - 5);
            
            /* Why not */
            topicTree.lookupTopic(lastString);

            /* First 4 bytes is the subscriber id */
            uint32_t id;
            memcpy(&id, data, 4);

            /* Then one byte action */
            if (data[4] == 'S') {

                /* Some ridiculously long topics has to be cut short (OOM) */
                if (lastString.length() > 512) {
                    lastString = "too long!";
                }

                /* Subscribe */
                if (subscribers.find(id) == subscribers.end()) {

                    /* Limit number of subscribers to 100 (OOM) */
                    if (subscribers.size() > 100) {
                        return;
                    }

                    uWS::Subscriber *subscriber = topicTree.createSubscriber();
                    subscribers[id] = subscriber;
                    topicTree.subscribe(subscriber, lastString);
                } else {
                    /* Limit per subscriber subscriptions (OOM) */
                    uWS::Subscriber *subscriber = subscribers[id];
                    if (subscriber->topics.size() < 50) {
                        topicTree.subscribe(subscriber, lastString);
                    }
                }
            } else if (data[4] == 'U') {
                /* Unsubscribe */
                auto it = subscribers.find(id);
                if (it != subscribers.end()) {
                    topicTree.unsubscribe(it->second, lastString);
                }
            } else if (data[4] == 'F') {
                /* Free subscriber */
                auto it = subscribers.find(id);
                if (it != subscribers.end()) {
                    topicTree.freeSubscriber(it->second);
                    subscribers.erase(it);
                }
            } else if (data[4] == 'A') {
                /* Unsubscribe from all */
                auto it = subscribers.find(id);
                if (it != subscribers.end()) {
                    std::vector<std::string> topics;
                    for (auto *topic : it->second->topics) {
                        topics.push_back(topic->name);
                    }

                    for (std::string &topic : topics) {
                        topicTree.unsubscribe(it->second, topic);
                    }
                }
            } else if (data[4] == 'O') {
                /* Drain one socket */
                auto it = subscribers.find(id);
                if (it != subscribers.end()) {
                    topicTree.drain(it->second);
                }
            } else if (data[4] == 'P') {
                /* Publish only if we actually have data */
                if (lastString.length()) {
                    topicTree.publish(nullptr, lastString, std::string(lastString));
                } else {
                    /* We could use having more strings */
                    topicTree.publish(nullptr, "", "anything");
                }
            } else {
                /* Drain for everything else (OOM) */
                topicTree.drain();
            }
        }
    });

    /* Remove any subscriber from the tree */
    for (auto &p : subscribers) {
        topicTree.freeSubscriber(p.second);
    }

    return 0;
}


Line	Count	Source
1		#define WIN32_EXPORT
2
3		#include "helpers.h"
4
5		/* Test for the topic tree */
6		#include "../src/TopicTree.h"
7
8		#include <memory>
9
10		// std::vector<std::string_view> topics = {"", "one", "two", "three"};
11
12	3.11k	extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
13		/* Create topic tree */
14	4.03M	uWS::TopicTree<std::string, std::string_view> topicTree([](uWS::Subscriber *s, std::string &message, auto flags) {
15
16		/* Depending on what publishing we do below (with or without empty strings),
17		* this assumption can hold true or not. For now it should hold true */
18	4.03M	if (!message.length()) {
19	0	free((void *) -1);
20	0	}
21
22		/* Break if we have no subscriptions (not really an error, just to bring more randomness) */
23	4.03M	if (s->topics.size() == 0) {
24	958	return true;
25	958	}
26
27		/* Success */
28	4.02M	return false;
29	4.03M	});
30
31		/* Holder for all manually allocated subscribers */
32	3.11k	std::map<uint32_t, uWS::Subscriber *> subscribers;
33
34		/* Iterate the padded fuzz as chunks */
35	6.41M	makeChunked(makePadded(data, size), size, [&topicTree, &subscribers](const uint8_t *data, size_t size) {
36		/* We need at least 5 bytes */
37	6.41M	if (size > 4) {
38		/* Last of all is a string */
39	5.88M	std::string_view lastString((char *) data + 5, size - 5);
40
41		/* Why not */
42	5.88M	topicTree.lookupTopic(lastString);
43
44		/* First 4 bytes is the subscriber id */
45	5.88M	uint32_t id;
46	5.88M	memcpy(&id, data, 4);
47
48		/* Then one byte action */
49	5.88M	if (data[4] == 'S') {
50
51		/* Some ridiculously long topics has to be cut short (OOM) */
52	2.27M	if (lastString.length() > 512) {
53	19	lastString = "too long!";
54	19	}
55
56		/* Subscribe */
57	2.27M	if (subscribers.find(id) == subscribers.end()) {
58
59		/* Limit number of subscribers to 100 (OOM) */
60	2.13M	if (subscribers.size() > 100) {
61	34.4k	return;
62	34.4k	}
63
64	2.09M	uWS::Subscriber *subscriber = topicTree.createSubscriber();
65	2.09M	subscribers[id] = subscriber;
66	2.09M	topicTree.subscribe(subscriber, lastString);
67	2.09M	} else {
68		/* Limit per subscriber subscriptions (OOM) */
69	142k	uWS::Subscriber *subscriber = subscribers[id];
70	142k	if (subscriber->topics.size() < 50) {
71	131k	topicTree.subscribe(subscriber, lastString);
72	131k	}
73	142k	}
74	3.61M	} else if (data[4] == 'U') {
75		/* Unsubscribe */
76	21.6k	auto it = subscribers.find(id);
77	21.6k	if (it != subscribers.end()) {
78	19.7k	topicTree.unsubscribe(it->second, lastString);
79	19.7k	}
80	3.59M	} else if (data[4] == 'F') {
81		/* Free subscriber */
82	2.32M	auto it = subscribers.find(id);
83	2.32M	if (it != subscribers.end()) {
84	2.07M	topicTree.freeSubscriber(it->second);
85	2.07M	subscribers.erase(it);
86	2.07M	}
87	2.32M	} else if (data[4] == 'A') {
88		/* Unsubscribe from all */
89	9.12k	auto it = subscribers.find(id);
90	9.12k	if (it != subscribers.end()) {
91	8.10k	std::vector<std::string> topics;
92	29.5k	for (auto *topic : it->second->topics) {
93	29.5k	topics.push_back(topic->name);
94	29.5k	}
95
96	29.5k	for (std::string &topic : topics) {
97	29.5k	topicTree.unsubscribe(it->second, topic);
98	29.5k	}
99	8.10k	}
100	1.25M	} else if (data[4] == 'O') {
101		/* Drain one socket */
102	3.02k	auto it = subscribers.find(id);
103	3.02k	if (it != subscribers.end()) {
104	2.00k	topicTree.drain(it->second);
105	2.00k	}
106	1.25M	} else if (data[4] == 'P') {
107		/* Publish only if we actually have data */
108	1.09M	if (lastString.length()) {
109	25.5k	topicTree.publish(nullptr, lastString, std::string(lastString));
110	1.07M	} else {
111		/* We could use having more strings */
112	1.07M	topicTree.publish(nullptr, "", "anything");
113	1.07M	}
114	1.09M	} else {
115		/* Drain for everything else (OOM) */
116	156k	topicTree.drain();
117	156k	}
118	5.88M	}
119	6.41M	});
120
121		/* Remove any subscriber from the tree */
122	22.9k	for (auto &p : subscribers) {
123	22.9k	topicTree.freeSubscriber(p.second);
124	22.9k	}
125
126	3.11k	return 0;
127	3.11k	}
128

Coverage Report

Created: 2026-11-12 07:10